I have a 2000 blazer 4wd with a 4.3 vortec and have a no start situation. It cranks OK. I first checked for spark (OK) and noted the plugs were wet. I took them all out cleaned and dried them. Tried again with no success. I have replaced the plugs and fuel filter, the cap and rotor look good. Compression check showed 130 to 135 PSI. The fuel pressure check showed 60 psi at key on as well as crank and held pressure for 20 plus minutes. I have also checked the injector connection for power (all six have 12V at key on) and have also checked for injector ECM signal at crank (OK). I have a buddy suggest it could be the crank sensor. Any help would be appreciated.

Thanks Bob

 

are there any codes? and also how many miles on it? if your getting fuel and have compression also spark there is no reason an engine will not start, besides failed electronics or human error. I would have to say ignition switch, but lets not jump to conclusions. We dont know if your tossing codes or not, check for codes and come back

 

214,853 KM. I will have to get my hands on a scanner. I will post the results then.

 

You can have spark, but if it is not properly timed, it won't do any good.

I agree, start with seeing if there are any codes present.

 

its the ignition coil. its the thing that looks like a small computer chip and it has a spark plug wire going to it. gm makes garbage parts like that and its almost always that, more of the time when its wet or damp. ive delt with it for a while, there about 50 bucks but try that and im more that sure thats your problem bud

 

I have not been able to get a scanner to check codes. The local shop suggested a cap and rotor, he has had a S-10 with the same problem and that fixed it. I took one of the old plugs and supper gapped it (100 thou +) to increase resistance and did not have spark at the plug wires but did have spark at the coil. I should be able to get replacements tomorrow.

Thanks Bob

 

I got it fixed, it was the coil. Thanks for all of the help.

Bob