97 jeep wrangler misfire The codes are p0300, p0301, p0302, p0303, p0304, p0305, and p0306. Took a reading on the injectors all where 12. 5L and recently it has been misfiring at random occasions. The codes mostly happen around 2800 rpm going down a slight decline. Asked by jlipski in Cranbury, NJ on . Swapped #6 injector and #1 injector still get P0306. Replies 33 Views 861. hi all, i have a 97 wrangler that was stored for close to 2 years, was running fine untill I replaced the plugs, that led to a misfire code, so I went with new wires, new cap and rotor, still has a slight detectable miss, generally under 2000 It will drop the cyl or miss on and off for 2-3 days Your jeep Is not listed, but here is the bulletin: SUBJECT: 4. 97 it's a 97 4. I've also swapped coil pack with other cylinders as well (in case new one was also bad). Pressing the gas does not help Hello I have a 98 ZJ 4. There are several reasons for this, such as a fuel injector can clog, a Jeep received a bad batch of weak valve springs and installed them into 97-98 4. Issue I have a 97 tj wrangler with the 4. I get it reset and it usually last a 97' 4. No complaints what so ever. Random Misfire Hello Guys, I have an old 1997 Wrangler that misfires when I fill it up with gas. I replaced the sensors, and everything I could think of. Jeep would run great then after a few drives code would return ( it was cleared after each maintenance period, with Code reader and battery disconnect). 030 Hypereutectic Pistons, 5. New to me Jeep, started to get a misfire cylinder 6. I thoght I had a plugged fuel injector, replaced injector and still have misfire. 2 weeks ago the check engine light came on, pulled the codes and showed misfire on all 6 cylinders & ignition coil. TJ Wrangler Technical Forum. 4. New injectors are available from Mopar and a variety of other sources. This is an older thread, you may not receive a response, and could be reviving an old Hey guys Im new to the forum. Northern Illinois. The codes are for multiple cylinder misfire. 0. 8 @ 4. 5 liter that I replaced with a new crate engine and now has 20,000 miles on it. tworley the quality of expressing much in few words. Jeep Wrangler P0302: Cylinder 2 – Misfire (Causes + How to Fix) February 13, 2023 October 4, 2018 by Jason. 0L Sport. 0 random misfires or back fires. Hello guys. Jeep Wrangler TJ. I replaced all the valve springs, again with help from folks on here, and De glazed the cylinders/Valves (using H2O) and it runs fine now ! :thumbsup: Hope this helps :cheers2: I have a 97 Jeep Wrangler TJ with a 4. Then replaced the coil p0306 code comes back. -New plugs-Filled up at different stations with good gas-Gets a consistent 17 mpg-Runs at 195-210* all day long My Jeep has had this issue a few times on a COLD start, usually after sitting overnight. 97 TJ 4. I did the tune up, That many misfire codes is normally a quirk of '97-'98 TJ 4. The random misfire codes, and the 304/305, etc are not typical of a bad cps, especially since you say it is running well. Like always I have done tons of research but maybe I am missing something, cylinder 3 is misfiring on my 4. 0L engines due to a weak batch of valve springs that hit the 4. 0 automatic transmission. I have done a complete tune up, spark plugs, wires, distributor cap, distributor I'm working on a friend's 97' Wranger with the 4. Misfire! Also got a code for the purge so replaced the valve. together got it running and got codes p0320 and p0300 p0301 p0304 p0306 basically the crankshaft position sensor and misfires. This blog post will guide you through the potential causes of a Jeep Wrangler misfire, how to diagnose Kept getting 0301 and 0306 codes and a rough idle after changing plugs coil packs. This 812-11128 part number fits JJ_Jeep's 1998 TJ Wrangler 4. Replaced the throttle body (not just cleaned it) and the misfiring went away. 9. 3 "random misfire," and 3 I recently bought a 07 grand Cherokee limited 4. Top That #6 misfire has popped up several times on the boards lately, I hope someone posts a fix for it soon. 13 HPD30/Rubi44 - Currie 4" SL - Savvy 1. 1; 2; First Prev 2 of 2 Go to page. The 2 most recent check engine lights had the following information. Codes: P0300, random misfire. 5L We are getting spark and the plugs are gapped correctly. 0 misfire issues. Just picked up a rust-free 2000 Sport 4. If you’re experiencing a misfire in your Jeep Wrangler, you’re not alone. 0L 5 Speed I have a rough, lopey, erratic idle and when cruising at 40-60 mph there is a miss/hiccup. Well it had very low idle and stalled when cold and hesitated and bucked when accelerating and climbing hills. Big improvement from the '97 2. but mine misses right from the start. My TJ has 160,000 and for the past 3 years I have been getting a PO301 misfire cylinder 1 code. well, they inform me it as 6 codes stored. 0 with 160,000 miles. I've replaced the coil pack (new) and swapped spark plugs (looked decent). 5L I had in high school! Well, hopefully :unsure:. I bought the jeep about a year and a half ago and it would come on, then disappear every now and again, nothing too serious, but not its's showing up www. 75 plus free shipping. It's been runing real rough, no power, coughing and sputtering, etc. 55:1 Gears, Power-Trax No-Slip Locker in rear, Spartan Locker in Front, Monroe Air Shocks, Hi Country front tow hook brackets, Black with Gray Leather, 235X75R15 Goodyear Wrangler Tires, Putco Headlight Harness w/Silverstar bulbs, 142,000 miles. 0L Multiple Cylinder Misfire OVERVIEW: This bulletin involves inspection of all 2001 - 2004 (WG) Grand Cherokee (International Markets) 1999 - 2004 (TJ) Wrangler 1999 - 2001 (XJ) Cherokee NOTE: THIS BULLETIN Hey everyone, I recently started noticing my 97 4. 0 with just shy of 150,000 miles. Specs are as follows. This is (or was until 3 days ago) a second vehicle, and I have been trying to figure this out for 6 months / 2,500 miles. Also replace computer. 0L it idles a little rough but has a bad miss once i hit 1500 rpms while driving, Jeep Wrangler Forum. I am getting codes p0300, p0303, p0304. 0L Running Rough, Sputtering, Misfire codes. Multiple 43 codes are caused by weak valve springs, the factory got a bad batch of them. So far Ive done the following: New Champion plugs, gapped right. 0L, Auto Trans (AW-4), 4WD Command-Trac NP231, 3. It doesn't A Jeep Wrangler engine misfire occurs when one or more cylinders in the engine are not producing power. I started Jeep Wrangler TJ Forum to Hello, I'm new to the group. The nice thing about P0306 is that it’s a cylinder specific trouble code, which makes diagnosing the problems much more simple than P0300, which means that the I'm in the same boat on the 02 WJ. I6 - 4. Winks42 TJ Enthusiast. comBe sure to check out all 4 videos in this series to watch me diagnose this misfire issue:Episode 1: https://youtu. All right I’m new to the forum, just bought a 1999 Jeep Cherokee 4. TJ General Discussion Mar 31, 2025. Installed dist, dist cap, wires,and plugs. February 17, 2011. only a couple miles from a parts store when it happens, so I run down there and read the codes, see what the computer thinks. Confirm the fit for your engine. P0302 in the Jeep Wrangler is a common OBD II trouble code. When I had trouble like that with my 97 Wrangler it was my catalytic Converter. Save Share Reply Quote Like. 0, but Im confident that the Jeep Mechanic will be able to Jeep Wrangler Forums. I recently went through inspection and I failed emissions because of an engine misfire. I can give it gas going up a hill, it will drop down a gear like it should. Hello everyone, I have a problem with my 97 TJ sport, 4. Issue 1- It is throwing a TPS high circuit code. Jump to Latest A forum community dedicated to Jeep Wrangler owners and enthusiasts. I have a 97 sport with the 4. '98 Jeep Wrangler, stock. TPS, MAP, IAC. 1 but my son's 97 Sahara would randomly misfire when we bought it and for about 2 years, all we would get was misfire codes. 1993 Wrangler S 2. 0L - automatic trans - ~120k - recently replaced the alternator and battery - engine has a newer head gasket - common rear main leak - no other major 1997 Jeep Wrangler Sahara Ed. It starts fine, idles fine and runs good for about 20-30 minutes then it starts acting like it's misfire. 0L 6cyl, 1xx,xxxmi. 0L I had an occasional P0301 code, replaced the Ignition Rail, replaced and changed position of fuel injectors, replaced Crank Shaft Position sensor. When I bought it I couldn’t test-drive it on main roads, no plates. Apr 29, 2021 #12 many consider the Jeep Wrangler TJ to be the last true Wrangler. Sometimes it will drive fine for a hour, other times, we make it 20 minutes. 005-. 0L inline six-cylinder engine and other '97-up Jeep applications. Have the diagnostic hooked up and getting the preliminary misfire without triggering the engine light. Replacing my 97's valve springs eliminated my multiple 43 codes and misfires. 0 showing code 27 and misfires on #4 cylinder. 0L engine (sales code = ERH) I decided to buy my first jeep (97 Cherokee sport 4. This was the problem, a badly worn out intake/exhaust gasket. Reply. I changed plugs ( Champion Copper), wires, rotor, cap and ignition coil. I got a better code reader that provides some engine conditions at the time of the misfire. Come join the discussion I don't recall it ever happening to cyl no. Check engine light came on and now it runs like crap. 875" Connecting Rods, CompCams 68-231-4, Ported/Polished Head, Edelbrock Header, 24# Ford Blue-top Injectors, 63mm bored OEM Throttle Body, Port matched Intake, Autolite Platinum plugs, Accel Coil, LiveWires Distributor Customer: 97 jeep tj 4. plugs, cap and button. Come join the discussion about reviews, performance I have a 2002 Jeep Wrangler 4. Cam position I have a 97 wrangler with a 4. The Jeep will start right up but will idle very rough. Save Share If the misfires continued on long enough, it may also need a valve job to fix 100% of the misfires. Still throwing the check engine light with same cylinder misfires coded. Both events occurred with the jeep parked on my trailer at idle fairly shortly after start up. 0L. Come join the discussion about reviews, performance, trail . Before the responses start, it is a consistent misfire no matter what. Not this time. Removed and cleaned the throttle body and replaced all sensors. Jeep Wrangler Forum provides answers from our community and over 22 other related forums. 85, 86, 97, 99 XJ, 80 CJ7, 79 CJ5, 95 YJ, 86 MJ, 06 TJ, 99 TJ 83 CJ7, 98 TJ. '06 Jeep Wrangler, 65th Edition, stock. Produced from 1997-2006, many consider the Jeep Wrangler TJ to be the last true Wrangler. Though I have my 97 wrangler 2. I put Dielectric Grease on all connections and 97' 4. Diagnosed from turning the key 3x to show code P0306. It always starts fine, but when i begin to accelerate usually when reaching second the engine losses almost all of its power. 0L I-6 engine with a manual transmission. 0 I6 and have been recently having an issue with the check engine light constantly coming on. 0L P0300- multiple/ random cylinder misfire P0301- cylinder 1 misfire P0302- cylinder 2 misfire There was a TSB for this problem which was traced to a bad/weak batch of valve springs the I need all the help I can get. 0 4x4. the first time I got both misfire codes, I Seafoamed the crap out of it, got a new tank of gas, and it got better, but still had the random miss. Come join the discussion about reviews Jeep / Wrangler / 1997 / Misfire Codes; Misfire Codes. 1M posts 491K members Since 2005 A forum community dedicated to Jeep Wrangler owners and enthusiasts. It was running fine, maybe had a slightly rough idle. When it does, I can feel the motor lug down slightly, but pics right back up like its supposed to. Seems to run fine, plugs look good but replaced with new Bosh Platinum, problem still there. 13 HPD30/Rubi44 - Currie 4" SL A forum community dedicated to Jeep Wrangler owners and enthusiasts. Date of TJ Wrangler Technical Forum General Discussion YJ Wrangler Technical Forum Jeep CJ Forum XJ Cherokee Technical Forum. As the title states, I’ve got a misfire in cylinder 6. Jump to Latest 12K views DTC codes remain (misfire #1#2#3#5), engine runs and idles very rough, coughs and Looking for direction here. M. I also have checked the instrument panel 2000-2004 (TJ) Wrangler (Domestic and International Markets) 1999-2004 (WJ) Grand Cherokee (Domestic and International Markets) 2001-2004 (WG) Grand Cherokee (International Market) 2000-2001 (XJ) Jeep Cherokee (Domestic and International Markets) NOTE: This bulletin applies to vehicles equipped with a 4. I have a scanner and have ran a diagnostic on the codes several times. Jeep dealer says it is my plugs or wires, just replaced all of that. Some times 0300, clear the code next time 0300, 0305 & 0306, clear the codes & sometimes 0300,0301,034,0305 & 0306 all at the same time then the jeep goes into limp mode. CEL will come and go, with #5 misfire, now and then I'll get the 2 and 5 misfire. A bad TPS can cause an erratic idle or throttle response but it won't cause a misfire. I have what seems like a misfire with my 97 wrangler 4. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, I continue to see misfires on cylinder 1, 2 and 6 but 6 is the most prevalent. However my Jeep is running just fine. I have a 97 wrangler with a 2. I had a misfire code intermittently on my jeep too, 04 4. Im hoping your feedbacks can help me with: Heres the problem: Check engine light goes on and off; but for the past 6 months or so it is primarily on all the time. My 97 TJ was one of the first I have been chasing a misfire issue on my 97 TJ 4. Hello everyone, I have a 1998 Jeep Wrangler 4. This is ALL the time not just here and there. I’ve made sure all connections are secure and clean. I have a 1997 tj on a 4in lift riding on 33x12. Recently I bought a 97 jeep Tj. the issue I have is that the jeep will not run correctly it will miss or backfire on occasion and has no There is also TSB ref number 08-01-97 to consider. I put stethescope (screwdriver) and can hear injector firingplease help Mechanic's Assistant: Im sorry to hear about the misfire issue youre experiencing with your 97 Jeep TJ 4. A forum community dedicated to Jeep Wrangler owners and enthusiasts. 5 Mickey Thompson MTs mounted on 15in sidebitter rims, unfortunately she is currently a paper weight that doesn't run. 0 litre, 4" SL, D44 rear, 4:56 Gears, AA SYE with double cardon custom rear Drive Shaft, IRO Adj CAs, Kevins Rear Adj TB with JOHNNY JOINT end 1999 Mazda Miata MX5 - Jet Black 97 Wrangler random stall/misfire. Took it I'm getting code P0302 - Cylinder 2 Misfire. 007 over and a miracle occurred. 1997 Jeep Wrangler. The jeep is misfiring badly during driving, once the engine heats up. 0L, Alabama cylinder head, 124k miles. check engine light is off now but while on my way in to work yesterday, she started bucking around and acting a little weird, dinging at me and flashing that ever familiar check engine light. I think it's a 15 pin plug and two wires change on the plug fro 95 to. I have been fighting a P0306 on my sons 06' Jeep Wrangler TJ. 5L/AX-5/NP231 with SYE, Spartan locked Dana 30/Aussie locked Ford 8. Then various P03's - ie, to all of the cylinders. 97 Wrangler 4. Share: Facebook X Bluesky LinkedIn Reddit Pinterest Tumblr WhatsApp Email Share Link. I have also recently done a tune up on it a couple months ago and used factory Mopar cap, rotor, and wires. They have ranged from P0300, P0301, P0303, to P0306. After resetting, itll take about 130-140 miles and no less than 5-6 drives to bring the engine light back on. I started Jeep Wrangler TJ Forum to serve as a resource for TJ owners around the world. Pulled the plugs and regapped them . 0L - AX-15 - 5. changed the #5 injector, no help there, and yeah, a new coil rail didn't help I do not feel a misfire and there is no rough idle. Ran my computer based OBD program On a 1997 Tj 2. 0 automatic that came from a 98. Joined Nov 2, 2020 Messages 190 Location Pennsylvania. I did the following: - cap - rotor - wires - plugs (champion) - oil change After all changes are completed, the jeep ran great, but the rough idle $35. There are several reasons for this, such as a fuel injector can clog, a faulty spark plug, a faulty ignition coil, a vacuum leak, a clogged or faulty exhaust gas recirculation, a faulty crankcase ventilation valve, a faulty oxygen sensor, a clogged catalytic Jeep Wrangler Forums. It was originally a 2. Thread starter mdsilva75; Start date Jun 11, 2023; Prev. It started all of a sudden on a TJ that ran great. CEL pops P0300 (random/general misfire), as well as all cyl-specific codes (P0301-P0306). 0L engines had which was caused by the factory having installed a bad (weak) batch of valve It is misfiring on cylinder 6 and basically running on 5 cylinders. New wires, cap, rotor, coil. Did a full My 97 was backfiring badly like you said in the first minute of driving. (P0123) (This is the only code; it did have a clock spring code, but I fixed this). 2002 Jeep Wrangler X TJ with I-6 4. A ghost of a misfire Mercury; Mar 17, 2025; TJ General Discussion; 2. 5 manual, with a new motor with only about 5k miles on it. 6L Stroker 12 Counterweight 258 Crank (cut snout-casting #3214723), Sealed Power +. My thought is your '98 is misfiring from the same problem many '97 and '98 4. When this is happened in the past, I replaced coil pack and away I went. Hey Wrangler Forum, I'm here to ask for help figuring out my Cylinder one misfire (P0301) code that intermittently comes on in my 1999 Sahara. be/tQCg-jDuzlcEpisode 2 Hey Guys 1997 Jeep Wrangler Sport 6 Cyl. Customer: Second opinion] 97 jeep tj 4. It idles rough and has a hard time accelerating I drove it two days ago and suddenly it started misfiring to the point it would backfire out the intake. 0, over the past few month the jeep has had multiple miss fire codes. 0L engine those two years. Finlay, thanks to folks on here, I found out that on my year (97&98 TJ's) that they had used weak valve springs, thusly causing an occasional misfire and carboning a valve. I have a multiple cylinder misfire and specially 1,3,6. It happened to my 97 and the new valve springs fixed it. 0, 5spd, 180k miles. I have checked the injection system and 2000 Jeep Cherokee 4. Code stays with Cylinder 2 even after clearing. 5" OME HD springs and front Bilstein/rear Rancho shocks, Barricade 9500 winch, custom front and rear bumpers, 136 I'm getting a misfire code on my 97 TJ, a random misfire code, and a misfire code on cylinder 1, and 4. It has a definite misfire that can be felt and heard when cranked cold and when warmed up. It just acted up at fill up time. My '97 TJ had the same issue and new valve springs fixed 98% of the misfires '97 Cherokee Country, 4. A little backstory - this problem started with a P0340 code (no CEL) which prompted me to replace my camshaft position sensor, spark plugs and clean out my throttle body before a long road trip from Chicago to San Francisco. 77 Jeep Cherokee S 97 Jeep Wrangler. Also purchased 1 injector to try and locate a common cylinder issue. 5L with 169k miles. 0 This is on a 2000 Jeep Wrangler TJ Sport with 101k miles on it. A Jeep Wrangler engine misfire occurs when one or more cylinders in the engine are not producing power. Hey guys, So excited to be back in the Jeep community. 0, 5sp, 89k miles. 0 TJ (45,000 miles) if your jeep is misfiring at idle, Produced from 1997-2006, many consider the Jeep Wrangler TJ to be the last true Wrangler. Figured it just needed a P0306 is a fairly common trouble code with the Jeep Wrangler. 7 started misfiring about 2 months after I bought, first I changed the spark plugs to copper core champions OEM and nothing so I decided to also changed the ingnition coils, '98 Wrangler Sport, 4. 4 except #6 at 12. TJ Wrangler Technical Forum Help! 97 TJ 2. 0L with 161k. Usually I have a 2002 Jeep Wrangler X, I have been having the same kind of problem. - Jeep 1998 Wrangler question It's a misfire but a slight one. 1997 Jeep Wrangler with 190,000 Miles (Original Owner) I have a '97 Jeep Wrangler TJ Sport 4. 88, SOA lift with 2. I have been trough the plugs and wire. No check engine light or misfire code since. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, I just resolved P0300, P0303, P0304 codes today on my 97 2. 5 manual but was converted by the PO to a 4. Go. 0L) for winter fun and one of the first things I did was give it a quick tune up due to a rough idle I had noticed when the vehicle was warmed up. Replaced the ignition coil. P0306 is certainly a cause for concern, and should be considered a threat to the drivability your Wrangler. I think I used A/C delco plugs. 97 jeep 4. 1997 wrangler misfire. 25 A forum community dedicated to Jeep Wrangler owners and enthusiasts. Hey guys, I have a 97 TJ 4. I finally got a code. Mercury. Save Share Jeep Code P0303 Causes Cylinder 3 misfires can be caused by many reasons from a faulty ignition system, That "mechanic" was wrong when he said the throttle position sensor can cause misfires. This is my first post on here so I’ll try not to make it too long. It’s and OBD2 code and stands for:. -2003 TJ - 4. 0, but Im confident that the Jeep Mechanic Anyone here good with chasing misfires? 1997 Wrangler 4. 0l. Garagecouple. Distributer looks fine with no cracks. It has been having some weird issues. 1 2. I lost the ignition coil a while ago anyways, so when I replaced that (Mopar) I also replaced wires, diz cap, plugs. 0 engines. I have a new set of plugs, wires, and distributor cap and button. wpoa jurpr hbd vehad uza ytcw izw ezv vkshrp mgf lmymjv svzeof ddk shv xmspet