What could be happening?


Asked by Momn51985 Jan 26, 2021 at 03:03 PM about the 2000 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

Replaced everything possible including all gaskets
realignment of the timing and all turns over but
wont start...then replaced battery starter and fuel
filter... replaced plugs and wires also, so now
what??? And yes it's getting sparks and yes it's
getting fuel...

6 Answers

Are you replacing parts at random in hopes it will start? I think you need to have a mechanic look at it.

2 people found this helpful.

If you have spark and fuel but it still won't run you need to do a compression test. If all cylinders test very low or zero the timing chain has jumped. Hope that helps! Jim


A mechanic I AM A MECHANIC, WHAT CUZ IM A FEMALE I suppose idk what I'm doing right... anyway I have done compression It always reads a misfire on #4 piston...that finally went away after I cleaned the heads and changed those gaskets...yet now it'll turn over but not start!

1 people found this helpful.

What kinds of compression readings are you seeing? Did you double check the ignition timing? I believe on these you can still use a timing light while cranking. There's no "sawtooth" to check the ignition timing but I believe there's a mark on the vibration damper and a single arrow or something like that for you to reference the ignition timing as the engine is cranking. Hope that helps! Jim

1 people found this helpful.

Now my reader is stating TPS sensor circuit A says low input???

1 people found this helpful.

Another thing that comes to mind is the engine will not run if the cover on the throttle body assembly is not on. A friend had a 2000 Blazer and we found that out after we did a tune up on it. Hope that helps! Jim

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