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donj
New User
Jan 19, 2009, 8:26 AM
Post #1 of 3
(3110 views)
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Engine won't start
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I have a 1995 Chevy Astro Van AWD, 4.3L engine 68,000 miles. I'm experiencing no engine restart after use. After doing some driving around and van sits shut off for 1 /2 hour or so, while trying to start, engine turns over, but won't start. After several attempts of cycling the ignition, van does start. Could take up to 10-15 attempts. Almost seems like it's flooded. Starts OK when it sits for a long period of time, overnight for example. I've had the battery, strainer, fuel filter and 2 fuel pumps replaced and problem still exists. This has been going on for over 1 1/2 months now and mechanics can't seem to find the exact problem. Help is needed. Thanks
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 19, 2009, 9:18 AM
Post #2 of 3
(3106 views)
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Re: 95 Astro 4.3 Engine won't start well warm
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Putting foot to the floor should help if it's overfueling/flooded for the moment.
There's a CTS (coolant temp sensor) that tells the puter how warm the engine is near the thermostat (guess - black wire and a yellow wire) that just screws in - easy job.
If the vehicle is getting the message that it was colder it would behave like it is and overfuel like a choke would. It's a maybe and not sure if that would set a code but get a code reading anyway.
Check plug connection to the thing also. They have been trouble on some,
T
Thing looks like this. Just $16.99 - just checked.....
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DanD
Veteran
/ Moderator
Jan 19, 2009, 9:29 AM
Post #3 of 3
(3104 views)
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Re: Engine won't start
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I have seen a number of the fuel pressure regulators fail on these 4.3lt engines.
They will begin to leak externally; allowing excess fuel to enter the intake manifold. You will not see this fuel leak because the regulator is under the upper manifold housing. Some other symptoms are poor fuel mileage, black smoke (soot) from tail pipe and misfire when engine does start.
A cold engine usually wants a little extra fuel and the engine will start if this a small leak but a warm engine will flood out quickly, if the regulator is leaking.
I would connect a fuel pressure test gauge to the system, run the engine and make note of the pressure. Shut the engine off; the pressure gauge will either bump up or down a little bit and then should hold. Loosing no more then 2 or 3 pounds; in a fifteen minute time frame.
If the pressure does drop off and once you have confirmed that there are no other fuel system leaks; pull the upper intake and do a visual inspection of the regulator. If the regulator is leaking; you’ll see that the fuel will have washed any soot away from the regulator housing.
Dan.
Canadian "EH"
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