Mechanics

CHEVY LOSS OF POWER

2002 Chevrolet Blazer

Engine Mechanical problem
2002 Chevy Blazer 6 cyl Four Wheel Drive Automatic 58000 miles

While driving using cruise control it seemed like someone put the vehicle in neutrel and sped up the engine and then back in drive. We drove it home and about 2 weeks later while driving it just lost all power could go no faster than 10 miles a hour. We did change plugs, wires, cap, rotor, sensor by air filter, cat, plus did a compression test which was fine. RPM does not go higher than 1500. Going crazy what else can be done?
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Buddy88
June 18, 2008.



Did you check the MAF (mass air flow) sensor. This could cause it. Does it have a check engine light on.

Tiny
Rhall77
Jun 19, 2008.
Already changed that and no check engine light is on right now

Tiny
Buddy88
Jun 19, 2008.
Can you check and see what your fuel trims are reading with a scan tool

Tiny
Rhall77
Jun 19, 2008.
If you mean the fuel pressure we did it read 65lbs

Tiny
Buddy88
Jun 19, 2008.
No I mean fuel trims. It the reading that tells you weather you have a vacuum leak (lean condition) or to much fuel (rich condition)
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Tiny
Rhall77
Jun 19, 2008.
Okay how do I do this?

Tiny
Buddy88
Jun 19, 2008.
You will need a scan tool that will read fuel trim (like a tech 2 from your local dealer). Road test it. If it is -15% then your engine is sucking air which in most cases is a vacuum leak. If it is +15% then its a rich condition and it is getting to much fuel. In all cases you want it to be around + or - 3%. Right around 0%. If you can get back to me what the reading are.

Tiny
Rhall77
Jun 19, 2008.
Also did you check your fuel filter to see if it was plugged. If you didnt I would do that first before the fuel trims.

Tiny
Rhall77
Jun 19, 2008.
Already replaced the fuel filter this morning

Tiny
Buddy88
Jun 19, 2008.
Then your next step is to check your fuel trims

Tiny
Rhall77
Jun 19, 2008.
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