1992 Chevy s10 load of problems , please advise...

[westpur]

I have a 1992 Chevy s10 with a 2.8l v6 engine. I can't get the idle to slow down. It races. I replaced the "EGR Vacuum Solenoid" like advised, but it changed nothing. I have no vacuum leaks that I can find. The EGR Valve will slow down the engine if I push the diagram up manually. I took the EGR Vacuum Solenoid and hooked up a air line from a fish tank and a valve to control the air and can slow it down a bit. but it seams like it has less power when I do that.

Next problem. The ac/heater blower. Sometimes it blows air sometimes it does not. I have changed out the switches several time. they work for a while an quit.


Next problem. It will not start on a realy cold morning or a very hot day. the temp needs to be between 70 and 90. Anything other then that and I will need a jump to start it , or I have to push start it.

I just replaced the battery after only one year. that makes 5 batterys it has killed.

I would like to replace the throttle body with a carberator that I can control. What would you recoment to do it ? Or should I call the local auto salvage and let them just come and take it away ?


Any thought would love to hear from you all and see what I should do..Thanks
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[MT-2500]

Have the charging system tested for proper charging and voltage.

On the idle check the TBI base gasket.

[Schrade]

Do a vacuum leak test, then a fuel pressure test (see youtube for the fuel pressure test "Fuel pressure test")

Vac leak:

Loping idle is vacuum leak. 30 year old lawnmower, or a new car on the lot. If it sucks air where it ain't supposed to, it lopes.

Brick on pedal, block TB arm, anything to get a STEADY idle. 1200rpms or so... Feed starting fluid spray, A LITTLE AT A TIME, EVERYWHERE. Rev increase is the leak.

In a tough spot to pinpoint? Light a book of matches, blow it out while the heads are burnin', and feed the smoke to the leak.

I guarantee better running if you check these...

[westpur]

I just put a new alternator on it, the old one died. It run ok for a short trip. But the idle went wild on the way home. I am going to have someone look over the vacuum line and check for a leak. I did my best to find it but I have not found any. But I did notice that when I pulled on line off after the truck is turned off , it had a large amount of vacuum on the line , after the truck was turned off. Thanks for your tips, I will continue to seak and repair as I find the problems. Wes

[MT-2500]

Has the new alternator and charging system and battery been check for proper voltage and charging?
Have you checked for and cleared codes?
Have you checked the TBI base gasket?

[srtolly]

Idle problem could be carbon buildup in EGR passages in the intake or EGR valve. worth a check anyway.

I had the same heater issue with my 92 4.3L and had to replace about 2ft of the wire from the heater motor back.

I recently had to replace my starter that was causing some charging and starting problems and found a crack in the solonoid housing and i suspect a short somewhere causing a slight drain on the battery.

I live in Minnesota and plow snow in the winter with my s10 blazer (works great for the last 8 years.) and I think the fuel injection is far more reliable. I think once you get the first issue fixed it may fix this one as well.

Just some thoughts and experiences, hope it helps.

[colbra]

check the tbi gasket, sometimes a piece breakes off and jams the butterfly valve on the throttle body.