Mechanics

4.2L ROTATES BUT DOES NOT START.

2003 Chevrolet Trailblazer • 6 cylinder 2WD Automatic • 200,000 miles

2003 trailblazer 4.2l rotates but does not start. I have fuel pressure and I pulled out coil grounded it off and have spark, took out camshaft sensor and it was caked with carbon and cleaned it and it wanted to start but didnt. Do you think it is sensor?
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Johnskinner1232
July 22, 2011.




It could be do you have any codes in the computer?Have you checked for codes yet?

Saturntech9
Jul 22, 2011.
I have code light that came on but don't have tester with me. I will have to get it in morning. I got the sensor for $20 going to try that thank you though

Tiny
Johnskinner1232
Jul 22, 2011.
Pour fuel in the throttle body does it start?

Cadieman
Jul 22, 2011.
I put crank shaft sensor on tried to start it but but only rotates still dont turn over. I pulled plug and there is fuel in there, so I know there is fuel getting to it, fuel pump comes on when I turn key. Pulled injectors off to see if they were clogged they are fine and I put fuel pressure tester on line and it is fine. Just stumped little I will figure it out but going through it now.I put test light on middle wire engine coils and hooked to battery and coils are working also put meter on pink cable on coil and it is reading fine on all of them. All coil boots are fine but one but that shouldnt make it not start. New plugs and gaps are good and have spark in all of them. New cam shaft sensor, new timing chain head has been rebuilt, took off pulley tensioner and belt to see if that was a reason still nothing. I also installed a new exhaust actuator sprocket and sensor

Tiny
Johnskinner1232
Jul 23, 2011.
Rent a code scanner or buy a cheap one and tell what are the exact code numbers you have?
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Saturntech9
Jul 23, 2011.

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