Question about 1999 Chevrolet Astro

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Our 99 astro will turn over but not start. the problem has been recurring and usually flares up after a hard rain. we've used wd-40 to dry up the wires which worked a few times. we've had the fuel pump replaced and the electrial checked within the past year. the research we've done online seems to show a common problem with the ignition coil. we're thinking of just going to buy one and replace it ourselves. are there any important things to know in regards of how to replace it? thanks!

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  • joanne116 Jun 26, 2009

    Thank you for the reply.  We have to have use of the vehicle and are going to just replace it.  Can you tell me how to remove the cover inside the vehicle so i can get to it and where to look for it once i have the cover off?


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The coils are not that hard to replace and you can pick one up at Auto Zone, they will also have a performance coil there too for around the same price. There was a TSB to the dealers that the screen that allows the distributor to breath to keep condensation from occurring get's dirty and corrosion occur to the wire's in the distributor. You may want to replace the rotor and cap or just inspect them for cracks and wear, inspect the condition of the wires in the distributor and make sure the screen is clean at the base of the distributor. The other thing to is to pay attention to the Ignition Control Module (ICM) there around $40.00 at Auto Zone too and they will have the step by step instruction for you to get the job done. The other thing that would cause a not start is a bad MAP sensor, that's going to be on the intake manifold buy the coils, check to make sure the wire harness is not damaged in any way. If you do go to Auto Zone have them scan the van for any DTC codes to why you have a no start. What is common is the ICM may have gone or is going bad due to corrosion and time, the coil may be bad but check the wire harness first, most of the time if there bad they never work again, check the MAP sensor wire harness and have it checked or replaced. Next time the van will not start, disconnect the MAP sensor wire and if the van starts. Replace the MAP sensor, have the van scanned for any DTC codes. The last thing would be a bad or dirty fuel filter, do a fuel pressure check at the shredder valve, you should have 60 to 65 pis during fuel line prime Engine not running, just fuel pump. and anything different will give you a no start. Good luck and hope this helps. keep me posted, well get your van running 100% again. 

Posted on Jun 27, 2009

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Next time when you face the same issue (after heavy rains), try to get the ignition coil tested.
There are few basic which you can to for your self, check the link

This should tell you if it is the ignition coil which is faulty.


Posted on Jun 26, 2009

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