Question about 1995 Chevrolet Astro

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Help hey i have a 1995 astro van 4.3L v-6 when at an idle runs real rough. shakeing, rattleing it feels like its gonna stall i have replaced plugs,rotor/cap,fuel filter,and checked vac lines,wires,what ever the thing is that is on top of the block it's a circlewith 2 wires in it i pulled it out and cleaned it and put power to it from the batt. and it opened and closed without a problem. i also took the van to a friend of mine and he put it on his snap-on dyno and checked the eng. and tran. and it showed no codes or problems what elce can it be this is my familys only transpo. and i dont have funds to get a new vechile thanks, clayton nemechek

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  • gnoclue2 Dec 31, 2008

    I have a 1995 chvey Astro with a code 43 it run horible at times then runs ok at times the service engine soon light comes on and goes out at times also


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It is the egr valve. It has carbon in it and will not open or close. I have the same engine on a 1995 safari and 1994 trailblazer. I had the same problem on both vehicles until I finally figured it out. Have a mechanic clean it out but do not replace. EGR valve is expensive.

Posted on Sep 08, 2010

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It would seem that you have checked/replaced most if not all of the usual suspects. Pls try:
1. start the engine on a dark night with the hood up. check for any arcing/high voltage spark from any of the high tension wires;
2. you may want to reconsider this step! run the engine, pull the spark plug wires (carefully, extremely high voltage) one at a time and note if the idle will not change. If no change that plug is not firing;
3. check the ignition B+12 going to the ignition coil primary terminal. If it is physically in contact with the A/C hose/line, it may be loosing a few strands inside the insulation, replace.

Other than the above, a few more checks (but not as simple):
a. check that the fuel pressure is between 50 to 66 psi;
b. replace your plugs to AC Delco CR43TSM or CR43TS or 41-803 Platinums.

This page may be of additional informative if not an interesting read. To my knowledge, a 1995 Astro van shares the same W engine with a GMC Safari and therefore would have the same concerns/solution.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 03, 2008

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hi sandra i'm fernando i will recomend you to have the 2 oxigen sensors removed and drive it the sensors are on the mufler pipe and must to be the closes to the engine they look like sparl plugs if this take care of your proble then you need to replace the catalytic on the exaust system and do a good tune up

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