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Fuel, injector, pcm?

Tiny
MATTDCANNON
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 204,000 MILES
Rough take off backfired through intake, struggles up hill, ok during mid range, lack of performance 2000 Chevy blazer. No check light, tested all sensors communications, replaced pump 58 psi, fpr, total tune up, checked timing, tapped pcm (no glitches) one day is good on fuel next time it would suck it down. Three month it this. Counted lots of treads same issue, but no answer.
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Wednesday, September 21st, 2011 AT 5:37 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,703 POSTS
Have you checked for vacuum leaks? Any black smoke from exhaust? Have you checked the catalytic converter for plugging?
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Wednesday, September 21st, 2011 AT 5:47 AM
Tiny
MATTDCANNON
  • MEMBER
  • 2 POSTS
Yes sir, no leaks used sethascope. No black smoke, it has a lot of hot pressure.
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Wednesday, September 21st, 2011 AT 5:53 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,703 POSTS
The earlier ones had a lot of trouble with the spider (injectors under the plennum. That is the first thing I would be checking. Also, double check the intake for vacuum issues.
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Wednesday, September 21st, 2011 AT 6:02 AM

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