2002 Chevy Astro Engine Miss

TEX RED

MEMBER
2002 CHEVROLET ASTRO
6 CYL
2WD
AUTOMATIC
150,000 MILES

I have a 2002 Chevy Astro that has an engine miss that is there when it idles and at speed. As a result, the Service Engine Soon light is on, and sometimes flashing when it is really rough. I have changed the fuel filter, plugs, cap, rotor, and even the coil. So far the problem has not gone away. The strange thing is that it seems to get better the longer you drive it. Any suggestions?

5 Replies

HMAC300

MECHANIC
48,601 POSTS

If your check engine light is on, get the code read so you will know where to start. Changing parts sin't the answer. Check to make sure all your vacuum lines are connected though, that can be a start. But get teh code read.

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Friday, October 2nd, 2009 AT 9:54 AM

TEX RED

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3 POSTS

I did get the code read. They said it was a #4 cyl misfire - that's why I started changing ignition parts. I checked all the vaccum lines I could find and they were all ok.

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Friday, October 2nd, 2009 AT 11:34 AM

HMAC300

MECHANIC
48,601 POSTS

If you have done all that then id' look for a vacuum leak, especially if it is better the more you drive it. Or do like your first mechanic said and take it to a delaer tohave the ijectors checked. You might try to have tehm cleaned and see if that will take care of it. Especially if you are doing shortdistance driving. Under 10 miles each way.

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Friday, October 2nd, 2009 AT 6:40 PM

TEX RED

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3 POSTS

Thanks for the advice - I will give it a try.

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Friday, October 2nd, 2009 AT 10:01 PM

TECHMAN1

MEMBER
82 POSTS

Astro ignitions eat themselves with such a high voltage constantly searching for a path to ground.

I wrap my coil wire with 3/8ths spiral band, cover that with 1/2inch split loom and then put a piece of 3/4inch heater hose split between the coil wire and the support member to keep this thing away from ground.

Behind your passenger front wheel is a plastic shroud. If this thing is not fastened securely and intact, you will hose your ignition coil, just above, every time you drive through water or snow.

Ken