1999 GMC Suburban

BARTEN9

MEMBER
1999 GMC SUBURBAN
V8
4WD
AUTOMATIC
148,000 MILES

Having probelms with check engine lite coming when towing or getting on to on ramp with a hill without a tow. It's feels like it stuggles. Also when I have the cruise control on when towing or going up hills without a tow. Had the fuel pump replaced about 1 year and 4 months ago, I beleive along with hareness. Had a tune-up about the same time maybe couple of weeks before. Please help don"t have a clue.
Sean

3 Replies

JAMES W.

MECHANIC
2,395 POSTS

What ever triggered the check engine light will be stored in the ECM's memory. You'll need to have the ECM scanned to retrieve the code(s), and pass that on to us. This will give us a starting point. Willing to bet it a problem with an O2 sensor. Please advise.

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Tuesday, April 14th, 2009 AT 9:13 PM

BARTEN9

MEMBER
2 POSTS

Did that before and sound that it was mis-firing. The shop(firestone) that I took it to said I need a tune-up. Did tune-up and lite came back on after about 25 miles. I was on the road and couldn't turn around. So I took it to the next shop(firestone)they honored the work that was done. They cleared the codes and add fuel injector cleaner. Drove around for about 500 miles. Lite came back on. Took it back to the first shop and said was still mis-firing. Cleared the code. Drive it for about 25 miles, lite came back on. I kept on driving, then cleared itself after a couple of days. Everytime the lite comes on it clears in less then a day. I was thinking the same thing about the O2 sensor. What do you think? Thanks I will let you know when I change the O2 sensor

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Tuesday, April 14th, 2009 AT 9:56 PM

JAMES W.