So, possibly not long enough to determine if you do get a short period of smooth running.

I'm looking at those codes and I keep going back to the same thing, but I can't quite rationalise the symptoms given the replacement of the harness and ECM.

I suspect that the injectors for those cylinders aren't firing because the ECM is detecting a no-spark condition and shutting them off so raw fuel isn't dumped on the cats. With codes across both banks, the ECM will also inhibit CL on both (which I think you have reported earlier?) It does allow for a short period after start up before monitoring commences.

The hole in this is that you're not also getting the P0352 I'd expect.

I could well be going up a complete blind alley, but it's the nearest I can get to explain the symptoms. I need to do some more thinking.

 

In order to eliminate the guess work on why it is not firing on #3,5 & 7 I would first place a volt meter on pins #1 & 4 and with the engine running see if you have a disruption of power to the coilpack. Pin #1 is ground (B) and pin #4 is power from the ignition coil relay (PW) now that is for a a harness for a 1999 vehicle I think you said you got for that car.

As for the injectors use a stethoscope and check each for a pinging sound. If you do not have one use a long screwdriver and place the grip of it close to your ear.

 

Ok, new information. I have a coil/spark tester and decided to check every cylinder. I figured I didn't need to check each of the coils because If I check the plugs and they showed they were firing, then the coils would be fine. I ran the check on all 8 cylinders. Every one of them showed spark. I used my stethoscope to check if all injectors were working. They were all ticking. It looks like the codes were leading me in the wrong direction. All coils and plugs are working. All fuel injectors are working. I get 41psi of fuel pressure with key on. I am getting codes for misfires on #5 and #8 now. I just realized I didn't check the fuel pressure with the car running. I'll do that later. Now I'm not sure which direction to go.

 

Have you done a hard reset after doing all of this work? If not perform a hard reset then turn your key on for 10 seconds then turn it off for 10 seconds. This allows the computers to talk to each other then start the car and see what takes place. Let’s eliminate the chance of the computers being confused or allow them to reset after the bad coilpack. Remember you will need to reset your windows.

 

I'll do this tomorrow.

 

I did a hard reset and key 10 seconds, and 10 seconds off. Started the car and got the same rough idle. ECM codes that came back after clearing all codes was still P0353, P0355, P0358. If I were to run the car with a scanner looking at live data, anything in particular I should look for?

 

Well that was not what I had hoped for! To recap you replaced the engine harness, coilpacks, checked plugs, replaced ECM and you have the same results as you had on the onset correct? Did you do a compression check on this car?

Without having IDS to get a live view to see what is happening it is going to be a guessing game as to what is causing this. I now have my thinking cap on!

 

I was hoping too that perhaps the P035x had morphed into P030x or something that would give a clue.

Can you lay hands on a oscilloscope?

 

Yes, all that was done with also new injectors and fuel pump. same results.I did also did a dry compression test when the problem first started. If I remember correctly all readings were between 122 and 130

 

I don't have access to an oscilloscope. Two years ago I had the car towed to a foreign car shop recommended to me by Wayne Carini. They had the car for 2 weeks and couldn't figure out the problem. I remember them saying they also got a code for the crankshaft sensor but never followed up on that.
t

 

The crank sensors did cross my mind but do not understand why the codes are on the same cylinders. They are not hard to change and the cost is not high.

Gus
JagRepair.com - Jaguar Repair Information Resource

 

I feel the same way. It doesn't make sense that the crank shaft sensor being bad would give those three cylinder codes, but it is an easy and cheap try.

 

I changed out the crankshaft sensor with no change. michaelh, on occasion I do get a P0303 and P0308. At times when I clear codes those do not come back and then at other times they do. They are back now after changing the crankshaft sensor. The P035- are also still there.

 

Please explain the P035-. Please give me all the codes you are getting.

 

These are the current codes
P0353, P0355, P0358, P0303, P0303, U1135, C1155, U1135, U1041. There are also codes for the seat control module.

 

I was musing as I'd expect the p030x codes as a consequence of the P035x. I'd really like to compare what's happening on these two ECM pins:



..as this would help confirm or refute what I'm thinking.

It's easy to go into tunnel vision mode:- thankfully Gus is here to sanity-check me.

 

Your codes are leading me to a possible bad ground or a poor feed to the coilpacks. You need to get readings on the grounds and power to the coils. I am leaning towards a bad ground connection.

 

I checked the voltage on pin 4 and got 12v on all plugs. Checking the ground I got a .1 reading on all plugs pin 1

 

Did you say you have a nikasil engine block?

Gus
JagRepair.com - Jaguar Repair Information Resource

 

When testing the grounds did you go from the plug to the grounding stud on the car?