1997 Chevy Blazer Major Issue That No-one Can Solve

Tiny
LEA1963
  • MEMBER
  • 1997 CHEVROLET BLAZER
Engine Performance problem
1997 Chevy Blazer 6 cyl Four Wheel Drive Automatic

97 Chevy Blazer: 4WD 4.3L 6cyl Runs great all winter, as soon as it gets hot out, it stalls or quits after driving for a while after making a few stops on errands. Been to several garages and Dealers. No Codes come up on diagnostic. The following have been replaced to try to solve the issue: Fuel filter, Battery, Altenator, Coil, Ignition Switch (Key was getting stuck in.), Fuel pump, Fuel Filter, Plugs, Air Filter, Fuses, Relays, Thermostat, etc. The temp gage is good, and shows no increase in over-heating. No codes coming up. Once in a while the Altenator gauge will indicate a slight overcharge. Have spark, and appropriate fuel pressure. No one can figure this out. Would gladly donate for a solution that works. Also need engine diagram. Have a repair manual that covers several different engine sizes but has no diagram of the 4.3L 6 cyl 4WD.
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Tuesday, June 30th, 2009 AT 7:24 AM

4 Replies

Tiny
JACK42
  • MEMBER
As far as a diagram goes, your best bet would be to sign up to our online manuals, it is printable and you can search through the wiring diagrams to find what you need. So when dead, has spark and fuel pressure but wont run? This engine has cam (in distributor) and crank (timing cover) angle sensors that tell the PCM when to fire. Either one of those can cause what you describe, and they dont always set codes.
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Tuesday, June 30th, 2009 AT 7:53 AM
Tiny
LEA1963
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It will start up and run for a while. Example: Ran downtown to make a few stops, after third stop at a store, it would not start when leaving. This vehicle runs great all winter, and only does this in the hot summer months. Sometimes it just quits in the middle of going down the road. But the engine shows no signs of overheating.
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Tuesday, June 30th, 2009 AT 9:06 PM
Tiny
DVS-TSI
  • MEMBER
Have you checked the catalatic converter. Sometimes the will let the car run untill the get hot sometimes even glowing at night.
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Monday, July 13th, 2009 AT 9:08 AM
Tiny
SWILLIAMS
  • MEMBER
When you say it won't start do you mean it won't turn over OR it won't run.
Do you notice any effect on this problem with outside temperatures? Say it runs fine if the temperature is 75 or lower but warmer and it acts up?
From your description I would say the fuel pressure regulator is failing. Had the same problem with an 02 last year. Engine was fine when temps were under 75 or so. Hotter and the engine would quit.
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Sunday, July 19th, 2009 AT 1:46 PM

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