Motojoe86
Member
- Joined
- Jan 19, 2018
- Posts
- 38
- Reaction score
- 10
Apologize in advance as this is now posted in 2 forums as I was unsure where to post this at. Anyhow, hello guys, I am new to this forum as a member however have been on here a ton to read on issues. Always seems to be a great source for all things Tahoe related. I have read several of your forums regarding check enginelight and am unfortunately creating a new one with hopes there might be more insight. Here goes:
Vehicle:
2003 Chevy Tahoe 4wd z71 with 5.3l flex fuel engine 160k miles
Symptoms:
I am getting a flashing cel whenever i am on the highway over about 70 mph. If i rev it in neutral it will flash being held over 2400 rpms as well. Also, whenever i have it in tow/haul mode it flashes almost all the time. Lastly, towing in regular mode it will flash about 50mph+. It seems to run good minus a very minor stumble in idle (unnoticeable rpmfluctuation) and terrible gas mileage. 2 side notes- i have an srs light on and my alternatoris going out which I am replacing this weekend. I cant imagine these would have any affiliation with cel though would it? It usually doesnt store a code however I have been able to pull random misfire code twice.
Work done to no avail:
-New iridium plugs gapped at .40
-New plug wires
-New coils
-New air filter
-New pcv valve
-Cleaned MAF
-Cleaned throttle body
-Fuel pressure tested within spec
-Seafoam through motor oil
-Crankshaft sensor tested within spec
I am running out of ideas on what to replace and the costs are beginning to add up. Any thoughts or ideas on the culprit would begreatly appreciated. Thanks in advance!!
Vehicle:
2003 Chevy Tahoe 4wd z71 with 5.3l flex fuel engine 160k miles
Symptoms:
I am getting a flashing cel whenever i am on the highway over about 70 mph. If i rev it in neutral it will flash being held over 2400 rpms as well. Also, whenever i have it in tow/haul mode it flashes almost all the time. Lastly, towing in regular mode it will flash about 50mph+. It seems to run good minus a very minor stumble in idle (unnoticeable rpmfluctuation) and terrible gas mileage. 2 side notes- i have an srs light on and my alternatoris going out which I am replacing this weekend. I cant imagine these would have any affiliation with cel though would it? It usually doesnt store a code however I have been able to pull random misfire code twice.
Work done to no avail:
-New iridium plugs gapped at .40
-New plug wires
-New coils
-New air filter
-New pcv valve
-Cleaned MAF
-Cleaned throttle body
-Fuel pressure tested within spec
-Seafoam through motor oil
-Crankshaft sensor tested within spec
I am running out of ideas on what to replace and the costs are beginning to add up. Any thoughts or ideas on the culprit would begreatly appreciated. Thanks in advance!!