Truck runs like crap when hot and mpg's suck

[JLDickmon]

Harness was burnt on 5 and 7 couldn't see it but after replacing runs much better. Still has a slight miss when hot but not nearly as bad. I think I need to do something w/ the injectors rebuild or replace.

JIM!

 

[DZL JIM]

And actually, I work in an chain shop for one of the more well known rubber manufacturers. We'll work on most anything up to 1-ton series, including railroad applications. I might be putting a timing belt on a Geo Metro one day, and changing an injector pump on a GM 6.5L the next.

My Bad. It sounded like you worked in a Ford Dealership.
I know Ford techs get upset when guys slam the stealerships online...

 

[JLDickmon]

My Bad. It sounded like you worked in a Ford Dealership.
I know Ford techs get upset when guys slam the stealerships online...

No worries.

 

[MUDKICKR]

i used to work for ford as a tech, i remember one day a guy brought his trk(f150) in and told us that when he took it in to have it inspected that the ball joints had play and made the trk fail state inspection. the service writer told me since the trk was under warranty install grease fittings to the ball joints, fill them up with grease and put a sticker on it. i said if its under warranty why dont we just replace the ball joints? he gave me a smartass answer and i desided to start looking elsewhere for employment. no i didnt quit at that moment but i wanted to. i did what i was told and the next day the guy was in there complaining that we didnt fix his trk. i know we didnt put ball joints in that trk and he was pissed about it(i would be too) but i couldnt do anything about it. i dont like the dealerships any more then anybody else.

 

[Brimmstone]

I'm having close to the same issue with the boss's dad's truck. It has a rough idle and run condition. I ran a buzz test and cylinder contribution test and both passed. I'm kinda thinking it may have a leaking o-ring in the fuel system. Any ideas would be greatly appreciated as this truck is making me look stupid. It's a 95 PS by the way.

 

[JLDickmon]

I'm having close to the same issue with the boss's dad's truck. It has a rough idle and run condition. I ran a buzz test and cylinder contribution test and both passed. I'm kinda thinking it may have a leaking o-ring in the fuel system. Any ideas would be greatly appreciated as this truck is making me look stupid. It's a 95 PS by the way.

would be a good guess..

 

[Mike]

Id lean towards the the IPR valve o-rings myself.

 

[JLDickmon]

Id lean towards the the IPR valve o-rings myself.

just out of curiosity,
what would make you think to start there without knowing IPR pressure?

 

[Mike]

just out of curiosity,
what would make you think to start there without knowing IPR pressure?

Rough idle when warm is a classic sign of IPR oring (or dirty gummed up valve) failure on these things. Injector o-ring should lead towards a very black fuel filter. Obviously one would pop to cannister lid to check that first.