Question about no start condition
#41
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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.
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.
#42
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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.
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.
#43
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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.
#44
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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.
#45
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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.
#46
#47
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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!
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!
#48
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#49
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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!
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!
Last edited by johns55; 02-20-2022 at 03:55 PM.
#50
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t
#51
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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
Gus
JagRepair.com - Jaguar Repair Information Resource
#52
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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
Gus
JagRepair.com - Jaguar Repair Information Resource
#53
#54
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Please explain the P035-. Please give me all the codes you are getting.
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.
#55
#56
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..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.
#57
#58
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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
#60