Why did you replace the crankshaft sensor, camshaft sensor, and the coil? Did you test these items before you replaced them to confirm that they were bad?
If you replaced the crankshaft sensor you must have your computer reprogramed to the new sensor. Take your Blazer to a dealership and have them perform a crankshaft sensor re-learn proceedure. While you are there, have them reflash the computer and check the timing. The only way to properly check the timing is with a $15000.00 scan tool, and usually the home mechanic does not have one. The reason for this is because your computer advances the spark, so checking the timing with a timing light WILL NOT work.
The fuel pressure is within spec, so you are correct in assuming the fuel pump is ok. If there is no spark, then yes it could be flooded - remove all the spark plugs and see if they are wet with fuel.
The knock sensor may have something to do with it, as well as a bad timing chain - but TEST and perform all the steps I just mentioned BEFORE we get to replacing anything else.
Testing for a stretched timing chain is simple, but lets see if the timing is off first. BTW- it should cost around 50 bucks or so at the dealer to have all all of thise proceedures done. This is well worth it.
Friday, January 29th, 2021 AT 12:56 PM
