dying after startup

dying after startup

Postby doggggboy [OP] » April 5th 2011, 7:45pm

2001 Astro 4.3l runs fine. Sometimes on startup it simply dies unless you give it more gas. Runs smooth but will die if you let up. If you shut it down and try to restart several times eventually it will start and idle fine. Happens both hot and cold engine. No codes showing. Any tips on where to start looking or is it back to the old shotgun approach and start replacing the cheapest thing first?
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Re: dying after startup

Postby Phantom » April 5th 2011, 7:48pm

Check fuel pressure to make sure the pump is able to provide sufficient fuel pressure , check to make sure the fuel filter is not plugged up , make sure all electrical connections are clean and tight.
Try just turning key on to hear fuel pump and turn off , do it about 3 times to fully prime pump then try to start and see if it runs well ,
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Re: dying after startup

Postby 1297chevastro » April 10th 2011, 1:49am

im having this problem on my '98. Does it smoke blue at idle, and smoke a ton when you rev it?
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Re: dying after startup

Postby paintdrying » April 10th 2011, 2:00am

Your fuel regulator may be leaking fuel into the oil. I would say compression check is in order.
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Re: dying after startup

Postby Thunderball » April 10th 2011, 3:46am

Mine does the same thing. When I start it up, it chugs a bit with rough idle sometimes. Once it runs for a few seconds all is fine. I get that rich smell out of the exhaust too. But, last week, i put in a bottle of STP Octane Booster, because it was on sale, to see if it made a difference in mileage. It didn't, but I noticed that my start ups were way better and much smoother. My engine is all tuned up and runs really good and has 175,000 miles on it. So, you may just be dealing with a gas issue. I know mine runs lousy on BP, Shell and any of those Ethanol-mixed gases. I normally run Marathon, Speedway and Sunoco.

If yours is actually dying out and stalling, you may have some tuneup issues, maybe an open vacuum line, or a clogged fuel filter.
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Re: dying after startup

Postby Woodweasel » April 10th 2011, 3:07pm

I had the same "start and cant idle" issue a few months ago. Ended up the Idle Air Control valve was stuck. Replaced it and idles like new.
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Re: dying after startup

Postby 1297chevastro » April 10th 2011, 5:11pm

Yeah im gonna check Fuel filter today. I will be doing a major tune up (Oil change and Filter, Fuel Filter,New Spark Plugs and wires,Clean egr valve,Fuel line flush) soon when i have the money. Is the idle air control a cheap fix? Also it idles better in neutral.
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Re: dying after startup

Postby 1297chevastro » April 12th 2011, 12:27am

yes fuel filter. Stopped smoking blue just lightly smoking grey it's always done that. It runs crap at idle i park and all gear ranges except neutral. I can slowly bring rpms up while still running smooth but if i punch it stumbles and spits and runs very rough.
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Re: dying after startup

Postby Woodweasel » April 12th 2011, 3:25pm

1297chevastro wrote:Yeah im gonna check Fuel filter today. I will be doing a major tune up (Oil change and Filter, Fuel Filter,New Spark Plugs and wires,Clean egr valve,Fuel line flush) soon when i have the money. Is the idle air control a cheap fix? Also it idles better in neutral.


Check your idle air control valve on the throttle body. An AC Delco IAC is around $100 at Rockauto. I dont recommend an aftermarket one ($35.00), it went out on me within 6 months. OR.... check your trans mount. When its in gear, there is a load on the trans mount, in neutral, no load. That might explain idling better in neutral.
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Re: dying after startup

Postby Leeann_93 » April 12th 2011, 9:51pm

Before you replace the IAC, clean it and the bore in which it rides.

Much cheaper than replacing it...
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Re: dying after startup

Postby redfury » April 13th 2011, 1:10am

Here's the way to check your IAC. If it doesn't start up, turn the key off, then turn the key on and wait 10 seconds. The IAC will reset itself and it should start up and idle fine. If it doesn't after trying that 2x, then you might have a different problem. The IAC controls idle. My van has this exact problem. I can't control the IAC with a bidirectional scanner either, so that right there tells me I have a bad IAC, or a bad signal to it. The dumb thing about mine is, I did a fuel pressure check on the van and immediately after pulling the gauge off, I started having the start up and idle issues...which I thought was extremely odd.
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