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diesel engine loping

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fuzzy1
User

May 4, 2012, 1:32 PM

Post #1 of 6 (3168 views)
diesel engine loping Sign In
Hello, I have a 11/96 (97) ford Super duty It don't identify if its a 350/450? It has a 7.3L diesel with 204000 miles on it.
I pulled codes and found a p0344. I installed a new cam sensor. I have checked fuel pressure and its at 55 psi. I have looked over all the major components and found nothing unusually wrong.

The problem its having is loping on startup. Its not really a engine miss but a lope. If you simply give some throttle for a few seconds it clears right up. There is no lack of power or surging while driving. I changed the fuel filter as well and drained the water separator. Im thinking it may be sucking air into the fuel system upon shut down but how will i know?

Any thoughts would be helpful.
Thanks, The Fuzzy1


nickwarner
Veteran / Moderator
nickwarner profile image

May 4, 2012, 1:47 PM

Post #2 of 6 (3161 views)
Re: diesel engine loping Sign In
If it was sucking air this would be low on power and missing like crazy at all times, so I don't think that is the issue. Do you have access to a professional scan tool that can view data? I'd be interested in knowing if the ECM is actually getting the cam signal or if the code remains present. Did you test wiring at the cam plug when you changed it? Is this only at idle speed during startup or will it act up at idle when its warm? Does it start unusually hard?


fuzzy1
User

May 5, 2012, 2:19 AM

Post #3 of 6 (3098 views)
Re: diesel engine loping Sign In
In Reply To
If it was sucking air this would be low on power and missing like crazy at all times, so I don't think that is the issue. Do you have access to a professional scan tool that can view data? I'd be interested in knowing if the ECM is actually getting the cam signal or if the code remains present. Did you test wiring at the cam plug when you changed it? Is this only at idle speed during startup or will it act up at idle when its warm? Does it start unusually hard?
yes I have a scanner and yes the ecm is seeing the cam signal. No the code is no longer present but it still has the loping problem. No I did not test the wiring at the cam plug. Temperature does not affect the loping, if its hot or cold it will only do this on startup and no it is not unusually hard to start.
Engine cranks and starts just fine, but once it starts is when the loping starts. Its only at startup everytime and again if you just give it a little throttle, about 1800-2000 rpm for just a few seconds it will clear up. If you shut it off and restart it will lope again.


nickwarner
Veteran / Moderator
nickwarner profile image

May 5, 2012, 4:31 AM

Post #4 of 6 (3089 views)
Re: diesel engine loping Sign In
how long does it need to be shut off before this will happen?


fuzzy1
User

May 6, 2012, 5:22 PM

Post #5 of 6 (3058 views)
Re: diesel engine loping Sign In
In Reply To
how long does it need to be shut off before this will happen?
over night or 2 seconds or 10 seconds or 60 seconds etc...
This problem is everytime the engine is started.


kensoncustom
User

May 17, 2012, 2:00 PM

Post #6 of 6 (2983 views)
Re: diesel engine loping Sign In
have you tried bottle of diesel injector cleaner? if that does not fix problem,find a shop that does a BG diesel injection tune up.this service works wonders





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