Check engine light and alarming news
Super Moderator
Joined: Mar 2011
Posts: 9,175
Likes: 521
intake leaks can easily be identified by monitor fuel trim data...do what I suggested before changing the intake gaskets. lots of things can cause a misfire...low fuel pressure, clogged cats...do some diag before replacing parts.
just because you have a random misfire code doesn't mean the system isn't picking up what cylinder is misfiring. the scan tool can monitor the misfire counters and isolate which cylinders are the problem.
just because you have a random misfire code doesn't mean the system isn't picking up what cylinder is misfiring. the scan tool can monitor the misfire counters and isolate which cylinders are the problem.
CF Monarch
Joined: Oct 2017
Posts: 4,605
Likes: 269
From: USA
smartphone, an app for Apple and/or Android for your smartphone and a BlueTooth device that plugs into your OBD II port under the dash.
I believe that some, or most of the automotive parts stores will scan your codes for free, but dont quote me on that. I'd call them up and ask first.
Thread Starter
CF Beginner
Joined: Aug 2018
Posts: 10
Likes: 0
Update!
I took my truck to a very well reviewed local service guy. One of the first things he did was a compression check, all, thankfully, good there. He checked intake suction and fuel pressure, and other things.
While he was working on it the problem went away. He cleared the codes and called me and said just take it and drive it and let me know.
Smooth as glass, full power, shifts great and no codes!
He says he has no idea why this happened, he says expect it to happen again,,or not. Might have been a stuck injector, one plug was wet, same one that looked different when we pulled them the first time through,
his comment after he drove it was "at least we know you don't need an engine"
I am cautiously elated !
I took my truck to a very well reviewed local service guy. One of the first things he did was a compression check, all, thankfully, good there. He checked intake suction and fuel pressure, and other things.
While he was working on it the problem went away. He cleared the codes and called me and said just take it and drive it and let me know.
Smooth as glass, full power, shifts great and no codes!
He says he has no idea why this happened, he says expect it to happen again,,or not. Might have been a stuck injector, one plug was wet, same one that looked different when we pulled them the first time through,
his comment after he drove it was "at least we know you don't need an engine"
I am cautiously elated !
Super Moderator
Joined: Mar 2011
Posts: 9,175
Likes: 521
intermittent problems can be hard to find. The 4.8 motor while not powerful; is a very good running reliable engine.
Sometimes coil packs stop working when they get hot. Note if the problem occurs after long trips. The tech needs a good description of the symptoms, and what condition makes the problem occur so they can re-create the problem for diagnosis.
Sometimes coil packs stop working when they get hot. Note if the problem occurs after long trips. The tech needs a good description of the symptoms, and what condition makes the problem occur so they can re-create the problem for diagnosis.