Slight Miss - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 09-03-2009, 06:12 PM Thread Starter
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Slight Miss

Went to dinner tonight and the truck was running real strong on the way there, it was a lot of fun. Finished up and started home and as soon as I started it, there was a very noticeable miss. I've noticed a slight miss at idle before, but its always gone away real quick. I knew as soon as I started it that this was different, the whole truck was shaking. No lights were on, and it was fine until the next stop where it was still slightly missing. I started off and it was still fine, but i could feel the miss while driving at lower RPMs in 4th and 5th. The truck never fully warmed up either direction as it wasn't a far drive.

The truck has 79k on it. I've only had it for 8 months and 11k miles, but and have changed the oil every 5k with valvoline synthetic. I always run power service at every fillup. The only thing that changed was I found about a quart of new oil in a gallon container from my last change that I put in it before I left since it was in the lower part of the crosshatch on the dipstick.

Is this a failing CPS, or injector at only 79k? How and what all can I check? Like I said, it hasn't thrown a CEL or anything. This is my first diesel so I'm still a rookie. I know my way around gas engines, have owned several, but I'll need explanations on diesel.

Thanks for the help
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post #2 of 5 Old 09-03-2009, 06:25 PM
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Is there ANY white smoke when you first start it up(hot or cold)?

Shane

2011 F250 Crew Cab FX4



STOCK!
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post #3 of 5 Old 09-03-2009, 06:29 PM
If it aint a CAT itsa DOG

 
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Try and get it hooked up to an AE scan tool and run an injector buzz test and a cylinder contribution test. I have a miss in mine that comes and goes. I found my #3 injector sometimes misses. I have no codes ot CEL's. I bought an AE thats how i found out about this. If i dump a can of sea foam into my tank it clears up my injectors for a while. I'm not saying 100% its injectors in your case, but i'm just telling you about my experiences with mystery misses.

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post #4 of 5 Old 09-03-2009, 06:34 PM Thread Starter
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No smoke at all on startup or while running.

Where do you get the AE scan tool? Are they expensive?
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post #5 of 5 Old 09-04-2009, 02:31 AM
If it aint a CAT itsa DOG

 
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I bought my AE at itpdiesel.com. I think now power hungry performance sells them too. I think they are around $350 bucks.

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