Question about 2004 Chevrolet Astro

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2004 astro van.started fine in the morning put rear brakes on now won't start.fuel pump works.when cranking over backfires through intake.didn't touch any wires when putting on

2004 astro van 2wd 4.3 engine.no start cranks over fine.started in morning then went to move later no start.back fires a little from intake when trying to start.no codes

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Could be low fuel pressure. Should be 50psi min.

Posted on Jan 25, 2015

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2004 astro van.started fine in the morning put rear brakes on now won't start.fuel pump works.when cranking over backfires through intake.didn't touch any wires when putting on rear br


Backfiring from intake usually indicates a timing problem. The brake job has not effect on the engine, unless you accidentally disconnected some wires in the engine compartment, but highly unlikely. More likely the timing belt/chain may have jumped a few teeth. If you have an access hole to see the timing belt and marks have a look. If you need more specific info most libraries have subscriptions to online automotive service manuals for almost any year, make and model of car, motorcycle, or whatever. If you have a library card, some will give you the u/n and p/w so you can access them from your home computer, if not then you will have to go to your local branch to get access, but it is free!

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The fuel pump pressure shoud be 55-61 psi . Check for spark by removing a ignition wire at a spark plug and put a spark plug in wire and hold to engine ground and crank engine , if no spark then remove coil wire at cap and repeat.If still no spark then coil , module,,crank sensor or pickup may be the problem.
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