What does a Chevy 2500HD, A 50ft Tow Strap, and my Truck have in Common? - Ford Powerstroke Diesel Forum
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Old 11-13-2010, 05:26 AM
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Question What does a Chevy 2500HD, A 50ft Tow Strap, and my Truck have in Common?

Well getting ready to leave work today and I start my truck, put it on high idle. I let it warm up and then I went to drive away. Well I drive about 50 yards and hit a stop sign and then I give it throttle let off and BAM!!!!!!! Engine RPMS go from 1200 tried to stay at 675 and then 400 and died. All in about 2 seconds. Dead wont start.

Well I have noticed similar things over the past few days. Like truck running like junk when cold. If you gave it throttle and let off RPMS would hit 500 ish (sounding like it want to die) then come back up to around normal idle 675. So when it was cold I would just take it easy. So thinking this was not normal, I decided to check FICM voltage and a good steady 48 DCV. So then I figured well hell, it has just got to be that it is cold and needs to warm up ~RUNS FINE WHEN WARM~ no problems at all.

So next idea is the "stiction" the case of oil causing the injectors to not fire right due to oil being so cold and not working right for the injectors. Well I run Rotella T5 systhetic. So figured not that, and just said "oh well just if it is going to run like junk when its cold, it will."

Ok back to Paragraph 1. After it died I pulled over and of course a few bad words and beating the dash. Well tried to start it and it cranks hard. Sounds like it wants to fire but doesnt. Climbed under the truck no fluid anywhere. Coolant level is steady and has been. So tried again. Same thing wants to start but doesnt. I noticed the oil H-L guage on the upper left of my cluster, well it took a while for it to get to the middle. (dont know if that is oil pressure, high or low?) Well after four tries I gave up and got a tow from a chevy 2500hd using my tow strap. Now I sit at my house with NO CEL, No DTC codes (using SCT). WHAT DO I DO? WHAT DO I CHECK?
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Old 11-13-2010, 05:30 AM
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Pull codes and check FICM voltage
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Old 11-13-2010, 05:46 AM
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[QUOTE=YoungMT Hick;2179382] I decided to check FICM voltage and a good steady 48 DCV. So then I figured well hell, it has just got to be that it is cold and needs to warm up ~RUNS FINE WHEN WARM~ no problems at all.
............................
NO CEL, No DTC codes (using SCT).QUOTE]

Yes few days ago i checked voltage, and there is no CEL or any Codes
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Old 11-13-2010, 05:51 AM
Almostdunfukinwidit


 

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What are you using to pull codes?
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Old 11-13-2010, 05:54 AM
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[QUOTE=YoungMT Hick;2179382] NO CEL, No DTC codes (using SCT). QUOTE]

yes SCT SF3
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Old 11-13-2010, 06:02 AM
Almostdunfukinwidit


 

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Need a real scanner thats capable of datalogging.

Either your FICM is bad or you blew your STC fitting
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Old 11-13-2010, 06:51 AM
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yes i did datalog. well after i charged the batterys and plugged in the coolant heater i got it started well. it goes back to the problem that it feels like it is misfiring one a cylinder every now and then just not smooth

well the data log says that the desired fuel mass is jumping around and whenever the desired fuel mass goes up the rpms drop.
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Old 11-13-2010, 06:56 AM
Almostdunfukinwidit


 

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Run a buzz test
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Old 11-13-2010, 07:06 AM
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ok what is stc fitting? ya pretty sure sct will not do a buzz test. what is that?
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Old 11-13-2010, 07:12 AM
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Sct will not do a buzz test ( at least to my knowledge), need a factory level scan tool. Bascivally it activates each injector to make sure the electronice are up to snuff, you can actually hear a difference if one is weak.
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