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Apparently the lack of throttle position output is symptomatic of a bad PCM. It certainly fits my case of severe 'all or nothing' symptoms. Note that when the problem was evident there was a strong smell of fuel and it just wouldn't run, but when i turn it off and straight back on, the problem...

Ok, after diagnostics from a local garage, this appears to be a bad ecu. It only occurs when extremely heat soaked, then the throttle does not respond. What kind of cost would I expect? Almost certainly will be trading this car in as it is becoming very costly.

^ sorry, i wrote that on my phone and was a little lazy. I meant right side as i look in the bay (from the front). It is currently being diagnosed locally.

Thanks, I'll bear it in mind, maybe try a deep clean of the old injector. However, the jeep runs great, lots of power smooth tickover, then at a repeatable 20min point it suddenly throws the check engine light and only then does it refuse to accelerate. Here is more info, the CEL was flashing...

Jeep is 2004 3.7 4x4. I used aftermarket parts, but really can't believe any combination of things could cause exactly the same issue.

Thanks. A bit clueless and ready for a jeep dealer diagnostic for $99. Are there any wiring diagrams available? It does sound like the timing was retarded... But why only the cylinder 1 code? Anything to do with it being the first cylinder the fuel gets to on the rail?

Thanks, I have only done visual connection checks. You think I should ring them out? Also, as this is an intermittent "hot only" problem, it makes wiring checks difficult

Ok, i fitted a new injector in cylinder 1. After a few short trips in succession, nice and hot engine. I got the check engine light and it started refusing any more than minimum throttle. It is not a 'typical misfire'. The engine is jerking in time, almost like it must be electrical...

Hi, I replaced a fuel injector on my 3.7, which involved removing the right hand fuel rail. Upon reassembly, I found the retaining clips very difficult to position, ensuring I had the rail tab slotted into the clip. Is there a trick to it? Has anybody got a tip for a tool to use? Thanks...

Yes. It certainly feels like that's the case. Do you have a good guide on injector removal and change? I may just go buy one for $47 rather than doing the whole swap around.

I originally had Code 201. So, i put in a new #1 spark plug and swapped the coils between #1 and #3. I thought this would highlight a bad coil. Following this, i got the problem and the codes 301 and 201 came up. It seems my new plug made this issue a little worse...? how odd. The...

Ok, there was nothing obvious on the coils or injector connectors. The spark plug was very black with soot. I replaced the spark plug and swapped coils between cylinders 1 and 3. If the issue moves to cylinder 3 I know it's the coil. If I get no more trouble, I blame the old plug. If the...

Thanks for the help. I'll dig into that stuff, maybe even swap parts to another cylinder. My spark plugs are a couple of years old. They are worth a look.

Well, I cannot replicate it or find/induce any problems at the coil. My wife drove it today and on a slightly longer journey it started playing up, misfiring code 201 and just very rough. Has anybody heard of this issue? I worry it is something with the ecu.

Thanks, that's what I'll be doing this weekend.

The code went away after a few starts. I can see this being a difficult thing to troubleshoot so I will continue to monitor before spending money. If anybody has had a similar experience, please let me know. The code is p0201

Running on the highway today i got the check engine light. The engine had been, very slightly rough, not really anything to speak of. The code was P0201, and with the check light the idle after stopping got very rough. I felt like i could 'rev out of it' and it would run ok again. P0201 =...

Any help if this is valve cover or head gasket? http://imageshack.com/a/img908/889/8j0yef.jpg I wonder if it could ever get really bad to the point where i lose a lot of oil? Just had a quote to repair both sides valve covers, $300-400. Thanks

Thanks, it should be published now. My coolant is brand new and i haven't lost any. Could it be to do with the AC condensation?

Anybody know what would cause this? I smell burning often, i thought that was valve gasket leaks. Perhaps rad cap blowing coolant? https://youtu.be/AtbBBgXl-Bo