1dirtyZ

iTrader: (1)

i posted this problem in the external section too, here are the symptoms:
the car missfires under any load and slightly while idling, ses flashes when cruising (random multiple missfires code).
here's some history of the problem, it started with a single miss every 10 or so minutes apart while in 6th under load. then the misses started getting worse thorough out the day untill it reached the condition above. it almost felt like a broken valvespring ( cause it happened om my car before).

we hooked the car to the scanner and it showed # 5 missfiring , so we change all the plugs to be safe and try again, now 1, 4,5 are missing.
so to keep it short here is what we did:

-swapped plug wires
-used a different coil and moved it to several locations
-did a compression check
- leak down test
- pulled valve covers and checked for broken springs
- pulled pushrods and checked for straightness

all had no result on the miss.

what can it be?

could it be a bad crank positioin sensor? cam sensor?

for some reason i keep thinking it could be that the reluctor wheel on the crank loosened up ( he just put in a new eagle crank), could that be the problem?
is there any way to check that?

deezel

Did you do a crank relearn?

1dirtyZ

iTrader: (1)

i don't believe he did , but as far as i know you don't need to do that unless you changed the pcm.
and the car was runnning great earlier.

2001 Pewter WS6

iTrader: (43)

You don't happen to have a Underdrive pulley on it do you??? This happened to a friend of mine and it drove him nuts. He put the stock pulley on and it ran perfectly. He sent the pulley back to ASP and they sent him a new one. It was good for a few month and went bad as well. This was the SFI approved pulley.

1dirtyZ

iTrader: (1)

i think he has an ATI fluidamper.
the thing is, the car runs like it has a dead cylinder and misses at low-mid rpm.