Miss at idle

[JCleary]

I ran out to get a cup of coffee this morning, truck was 1/2 way warm.



On the way back, I noticed that at idle, it had a miss.



Came back to the office, did a search w/ no luck...



There were no odd noises coming from the motor, but you could definitely hear a miss in the exhaust. On throttle, it seems the truck runs fine. Then the problem disappeared. I checked for codes... . Nothing. It has a 1/2 full tank of fuel, and has received a bottle of Stanadyne for every tank in the truck since new.



Any suggestions? I just got back from a 700+ mile trip this weekend and the truck ran great.

 

[rbattelle]

Can you be sure it's not just the A/C compressor cycling? Sometimes when mine kicks on the whole truck will shake and it feels like the engine stumbled



Can you describe the "miss"? What does it sound like?



-Ryan

 

[JCleary]

Well, the a/c and defrost were off, so it wasn't the compressor.



Through the exhaust, I heard pft-pft-pft-pft-pft-pft in time with the engine instead of a smooth purr as usual.



It sounded just like a gasser when you pull a spark plug wire. Revving it would sound normal, but when it settled to idle it missed. It hasn't happened any more today.



Kind of weird, I think. If an injector was bad, it should make noise or continue to miss, right?

 

[daytripper63]

Ran any injector cleaner / treatment



Just noticed not for sale anymore. did you get your house?

 

[JCleary]

Does Stanadyne qualify as a cleaner, or should I run something else?

 

[WCPoe]

Mine did the same thing after a restart without a full warm up. The miss went away after a couple of miles of driving. Was the computer confused??? It has never happened again - it's been about 2 months ago. 18800 miles now showing.

 

[rbattelle]

Does Stanadyne qualify as a cleaner, or should I run something else?

I think so. Certainly nothing wrong with trying it.



Give it a little time and see if it comes back. [Of course, now you'll be paranoid about it so you'll think it's makes all sorts of weird noises it never made before].



-Ryan