ECMs not touching anything John. Took the glowplugs out last night and cranked it - had fuel puff out of no 5. Tok it out changed heads on it and cleaned internals. Cranked again - no fuel coming out - put glowplugs back in cranked it - wouldnt start - hooked up efi - still only 200 psi. Im wondering if its not electrical.
Engine wont start - no fuel pressure
- Thread starter mick
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ECMs not touching anything John. Took the glowplugs out last night and cranked it - had fuel puff out of no 5. Tok it out changed heads on it and cleaned internals. Cranked again - no fuel coming out - put glowplugs back in cranked it - wouldnt start - hooked up efi - still only 200 psi. Im wondering if its not electrical.
There seems to be a conflict of opinion between whether there should be high fuel pressure when cranking the engine before it starts or not. You are saying its normal to only have app 200 psi when cranking the engine? Maybe you are right and if so that may not be the problem. Is there any reference available that can sort this out for sure? Thanks for your input by the way.
I have an LB7 but they have a smaller fitting. Otherwise I could pull the one out of my 05 I guess. mmm but I really would like to know the answer one way or the other on whether there is meant to be (4000) psi at cranking or not. Theres a big difference between 200 and 4000
Per the the GM service bulletin I have you need more than 10 MPa (1,450 psi) and 100rpm at cranking before it will fire.
The attached Doc is for LB7 but it maybe of some help.
Bluemax. It can cause no start and or rough idle and running. It will also throw communication codes like crazy. There is a good reason the housing is so sheilded.
Not to use the scan tool, you only have to set up EFI on it if your going to flash a tune to it
No need to do anything truck specific to data log. Just hook it up, select your controller from the scan tool, and connect.
Finally got efi to work in my 05. I disconnected ficu plugs and cranked it over and it shot straight up to 4000+ - so we can lay that one to rest about only having 200psi when cranking. So we definately have a fuel pressure problem but its looking more electrically related now.....
So far a leaky injector is possible. That injector has been replaced.
With the return to the tank disconnected lift pump on, only droplets come through. Turning the engine over nets no additional return through the line.
I can't remember if you've tried cranking with the the fprv unplugged so the cp3 defaults to wide open?
If so, what was the result? If not, try it.
If so, what was the result? If not, try it.
I can't remember if you've tried cranking with the the fprv unplugged so the cp3 defaults to wide open?
If so, what was the result? If not, try it.
Mitch we did try it but not after changing the possible leaky injector. Thanks for the remind.
And, how the hell have you been Mitch?
Im going to put a new set of injectors in so we can eliminate that one and then go from there. Waiting on Guy at the moment as he seems to have a handle on them. I like the part about them being flow tested and balanced too. I'll be back soon. Thanks all in the meantime
He did try it but did not make any difference.
Odd
Is there not a fuse for the cp3 under the hood? Maybe the regulators are junk? Possible the FICM is bad?Not sure, but he going to see if the injectors are the problem by way of new ones.
Thanks Simon.
Thanks Simon.
Anyone know where the crank and cam sensor reference circut is?
Step # 20-4 on the document that John posted
Step # 20-4 on the document that John posted