Miss when cold - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 04-02-2013, 07:07 AM Thread Starter
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Miss when cold

This is driving me nuts. I replaced the gaskets under valve cover new o-rings on injectors, injector cups, and the icp. Last time ford said was getting codes saying injectors not getting good connection but all that was replaced. I even tore it back apart and re checked. Now it has a dead miss when cold and takes a long time to come out. When warm it runs fine but mpg are so bad I hate to drive it. It basically did this last time but ford said no injectors are bad but thats what I think it is. When they run a buzz test will it show if its going bad but not dead yet? I hate to take back to ford for them to tell me same thing. I am about to by the software so I can do this myself.
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post #2 of 5 Old 04-02-2013, 11:37 AM
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If you have good compression and the GP system is working fine, then you need to be looking at the injectors. The buzz tests only shows if the solenoids are working. Your poppets may be worn out and that can cause an issue like you are having.

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post #3 of 5 Old 04-02-2013, 01:16 PM Thread Starter
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Okay so if the poppets are wearing out only way to find out which one it would be is to pull valve covers and start it up and unplug injectors one by to see which one it is? Anyway without a code it would be the ipr valve or maybe idm? Compression hasn't been checked not saying its bad but hasn't had these problems till recently so I wouldn't think it just lost compression but could have.
Next question I have is if I took it to them and they said it was still in the injection wiring where should I start to try to ohm everything out at?
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post #4 of 5 Old 04-02-2013, 01:58 PM Thread Starter
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Where is the best place to start ohming everything out to exclude a bad wire or connection some where. Also what pins do I need to ohm out on connectors?
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post #5 of 5 Old 04-03-2013, 12:11 PM
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Quote:
Originally Posted by redsmoke View Post
Okay so if the poppets are wearing out only way to find out which one it would be is to pull valve covers and start it up and unplug injectors one by to see which one it is? Anyway without a code it would be the ipr valve or maybe idm? Compression hasn't been checked not saying its bad but hasn't had these problems till recently so I wouldn't think it just lost compression but could have.
Next question I have is if I took it to them and they said it was still in the injection wiring where should I start to try to ohm everything out at?
The reason I say it could be poppet wear is because cold/thick oil has a hard time flowing through a worn poppet valve, and as the oil heats up it becomes thinner and will flow through easier.

If it does not have a code, then you can pretty much rule out the IDM as that will almost always throw a code if there is a problem.

You will want to find a wiring schematic for that.

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