Cylinder 4 Misfire
2nd Gear
Joined: Dec 2010
Posts: 2
Likes: 0
From: fort smith ar
please help po306
Hello when i got this 2000 discover 2 it ran fine after a few weeks i noticed a slit hesitation it got worse over time now i have no power and it sounds like a moped which i be leave is a miss when im on interstate i can feel it running ruff then its doing a catch up thing you can feel it run trig to run perfect witch it does fo 2 sec then goes back to crap no power kinda like a clogged fuel filter which i guess is not severs able my code po306 heres what ive done new plugs/4 o2s /beat out cad converters which i will replace win car runs right they were bad and it was stopping me from finding my prob i need a friend to help me threw this so i dont have to spend any more money then i have to my converters are going to cost 500 i guess and i already spent 500 on parts just want to find the prob
Overlanding
Joined: Nov 2010
Posts: 21
Likes: 0
Noticed the same thing
...and thank you for reporting back!! So many people have problems, post their symptoms on the forum, do some troubleshooting, then talk to Mike on the phone. Once the problem is fixed, nothing more is reported. If another member is having the same problem, they will probably read through the thread looking for a solution, only to find the only apparent solution is to call Mike, and the process continues ad infinitum.
Yes, I noticed the exact tendency- like hearing the joke but without the punch line. I tried to start a thread "Code Library- with answers" a day or two ago, but no takers so far.
https://landroverforums.com/forum/sh...ad.php?t=36381
Last edited by Fairview; Dec 10, 2010 at 07:39 PM. Reason: added link
4th Gear
Joined: Nov 2020
Posts: 4
Likes: 0
Cylinder 4 missfire.
Hi Disco Mike. I have a cylinder 4 misfire on a 2004 disco 2. I am at my wits end. I have switched out plug wires. The plugs are new. Also switched coil packs. Checked injector pulse no issue there. Installed a new injector for cylinder 4 also. Getting strong spark to the plug. Truck starts and rung great. Idles like a rock. Runs fine unless you get over about 2500 rpm or under heavy load then check engine light blinks and throws cylinder 4 misfire. Throttle position sensor appears to be working by looking at the live data. The only thing I can think of that could be causing this issue is either the ECM or possibly the cam position sensor. I would think that if it were the CPS I would be getting a random misfire not just cylinder 4. Do you have any ideas on this?
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