Welder7018

My 1997 F-150 4.6l runs slightly rich at idle. I Smell unbunt fuel at the tailpipe. Ive been having a intermittent missfire lately. Wondering if this can be a culprit? Ive changed everything but the wires and those will be soon. Just something that crossed my mind.

Krack499

iTrader: (1)

Could be if you have a cylinder that's not firing it's just gonna dump fuel

w0lvez

Replace the Vapor Canister.

Welder7018

Well I knew that. My scanner **** out a few weeks ago. I know a flashing CEL is missfire. But there is a constant CEL also. I was wondering if a bank too rich can cause a missfire because its not a Constant missfire.

Welder7018

Hmmm... didnt know a vapor canister can cause it to run too rich. My 92 had it bypassed since it got cracked. And didnt run rich..

Welder7018

Also it only seems to do it once its warmed up.

Krack499

iTrader: (1)

My 00 only would miss after being warmed up and it was just the coils

Welder7018

I just replaced them..... fuq....

4x4dave

leaky / stuck open injector can do it too

Welder7018

Yay. Hoping its not. $200x8 is not good odds...