Input Appreciated
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Joined: Nov 2013
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From: Wilmington, OH
Input Appreciated
My Excursion runs amazing when warm, however it’s only running on 7 cylinders when cold. By cold I mean anything with oil temp under 100 degrees. Scanned it tonight, only code aside from EGR (deleted) is a P0683. Ran a resistance check through the GPCM and all measured between .2 and .5 ohms. No contribution codes. I’m guessing I have a bad injector but why wouldn’t I get a contribution code for that cylinder?
Any idea why there wouldn’t be a contribution code? Going to run a parallel wire for the PCM to GPCM this weekend to eliminate that code.
Any idea why there wouldn’t be a contribution code? Going to run a parallel wire for the PCM to GPCM this weekend to eliminate that code.
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From: Wilmington, OH
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It doesn't really need a glow plug at that temp unless it's not delivering the correct fuel until it warms up and the other cylinders are compensating.
find someone with IDS or the clone and run the uncompensated test to really see what that hole is doing.
find someone with IDS or the clone and run the uncompensated test to really see what that hole is doing.
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Joined: Nov 2013
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From: Wilmington, OH
FICM steady at 14, 14 and 48.5.
Truck isn't really sluggish but when it shifts to 5th and the converter locks you can feel one hole isn't firing. Almost a stutter in power delivery. i'd love to find someone local that knows what they are doing, haven't been able to find anyone with IDS that has a clue, including the local dealer.
Oil temps below 60ish degrees are when this occurs, runs perfect above 100 oil temp.
Truck isn't really sluggish but when it shifts to 5th and the converter locks you can feel one hole isn't firing. Almost a stutter in power delivery. i'd love to find someone local that knows what they are doing, haven't been able to find anyone with IDS that has a clue, including the local dealer.
Oil temps below 60ish degrees are when this occurs, runs perfect above 100 oil temp.
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From: Wilmington, OH
That's my guess. Will have to see about getting a knock-off IDS.
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. You're a little too far away. But what you describe is classic example of a lazy injector. The last 6.0 I worked on had 2 lazy ones on opposite sides. They wouldn't even chatter until warmed up. I put in fresh 5w40 syn and Hotshots Secret. After 85 miles of hard running they both came alive on a 40° cold start.
. Which reminds me. Can you perform a BUZZ test? You can use Forscan for this. Then if you don't hear an injector BUZZ in order then more than likely that's the lazy dead one.
. Which reminds me. Can you perform a BUZZ test? You can use Forscan for this. Then if you don't hear an injector BUZZ in order then more than likely that's the lazy dead one.
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From: Wilmington, OH
Didn’t even think about the buzz test with Forscan. Can do that tomorrow morning. Truck should be cooled down enough to confirm. Does the buzz test run in order 1 through 8?
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From: Wilmington, OH
I should also add that I had the passenger side bank of injectors replaced about 20k ago. I’m hoping it’s not one of those but I should still be within the two year warranty if that’s the case.