WHAT ELSE CAN I CHECK ON MY 4.3 ENGINE THAT RUNS ROUGH AT LOW SPEED RUNS FINE AND FASTER SPEED

1991 GMC Sonoma

Tiny

Peasant

July, 20, 2012 AT 11:18 AM

1991 gmc sonoma sle 4.3 4x4 runs rough at low speed runs fine and faster speed, I've replaced plugs wires cap rotor, air filter set the timing, cleaned venture carbon with cleaner and tooth brush also replaced Idle Control Valve. I've checked all the vacuum hoses and did the throttle body gasket check thing with carburetor cleaner. Not sure what else to do. Can you help.
Thanks.
Ugo

FOUND 4561 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

3 Answers

Tiny

KHLow2008

July, 20, 2012 AT 12:00 PM

If equipped with EGR, check the system.

Tiny

Peasant

July, 29, 2012 AT 11:59 AM

EGR system checks out ok.I'd like to add it runs rough when below operating temperature I've also replace the temperature sensor. Once it's up to operating temperature it idles and runs fine. What next.

Tiny

KHLow2008

July, 29, 2012 AT 2:24 PM

Have the compression checked and valve clearances readjusted and retest.

Please login or register to post a reply.

How to read codes Chevrolet Blazer
Code Read Retrieval/Clear - Dodge Stratus
How to gather codes Ford Explorer
Read Codes Like a Pro
Code Read Retrieval/Clear
Code Read Retrieval/Clear Mercedes-Benz C230