hi ive tried almost everything i can think of checked egr valve replaced plugs wires checked cap checked vacuum lines check engine light comes on and off any suggestions
2006-12-23 10:53:45 · 12 answers · asked by Donald 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
its a 89 chevy 4x4 4.3 ci tbi
2006-12-23 12:11:56 · update #1
THIS WAS A COMMON PROBLEM THAT SOME OF YOUR OLDER GM TRUCKS HAD WITH THEIR THROTTLE BODY INJECTION SYSTEMS DURING COLD STARTS WHEN MOST OF YOUR FRESH AIR IS BLOCKED FROM ENTERING THE THROTTLE BODY... ANY VACUUM LEAKS AROUND THE THROTTLE BODY BASE GASKET WILL CAUSE YOUR MAP SENSOR TO ALTER ENGINE RPM AND OFTEN CAUSES A ROUGH IDLE...CHECK FOR VACUUM LEAKS AND IF THAT DOESN'T HELP...TRY UNPLUGGING YOUR MAP SENSOR TO SEE IF THAT SMOOTH ES OUT YOUR IDLE...IF SO...REPLACE MAP SENSOR.
2006-12-23 20:49:25 · answer #1 · answered by yourboytee 2 · 0⤊ 0⤋
You might try a fuel injector cleaner. I found that using this about every six months in a full tank a gas helps keep my truck running smoothly. My next door neighbor who happened to own a Napa Auto Parts store told me about this and he used to bring home the STP Fuel Injector Cleaner for me and for his vehicles. He was a great man and I miss him dearly. Anyway, try this and see if it works. Happy Holidays!!!
2006-12-23 11:06:21 · answer #2 · answered by Cindy Roo 5 · 0⤊ 1⤋
Check the fuel filter and you might also try adding an additive such as HEET to your gas tank to eliminate any moisture in the gasline.
2006-12-23 10:57:51 · answer #3 · answered by Anonymous · 0⤊ 1⤋
you can check the choke mechanism that sometimes does it as well also with the check light coming on and off I can think that perhaps you may need a new catalytic converter or oxygen sensor
2006-12-23 11:00:13 · answer #4 · answered by billc4u 7 · 0⤊ 1⤋
first thing is to get check engine lite code read.Any Autozone can do that.That may tell you the problem or point you in the right direction.What year is the truck?
2006-12-23 11:01:51 · answer #5 · answered by ozy 3 · 0⤊ 1⤋
My guess is a malfunctioning choke. You should be able to see its linkage moving along with the engines rpms as it fluctuates.
2006-12-23 12:07:20 · answer #6 · answered by ? 5 · 0⤊ 1⤋
check ur egr valve
2006-12-23 17:40:55 · answer #7 · answered by Anonymous · 0⤊ 0⤋
if it has a carborator, check over the vacume actuated choke pull offs
2006-12-23 10:57:46 · answer #8 · answered by duster 6 · 0⤊ 1⤋
Check your fuel filter.
2006-12-23 10:56:14 · answer #9 · answered by Anonymous · 0⤊ 1⤋
Is the IAC circuit ok?
2006-12-23 11:20:20 · answer #10 · answered by gdwrnch40 6 · 0⤊ 1⤋