Question about 1990 Chevrolet C1500

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1990 chevy c1500 v6 idles rough in gear

I just bought this truck for cheap. It doesn't seem that it was maintained well. The oil cap was stuck so I had to take the valve cover off and the oil obviously hadn't been changed frequently. (Not sure this matters, just some context) The truck idles pretty rough when I'm at a stop light in gear. It doesn't do it so bad in park, but it's still noticeable. Occasionally, I've noticed power steering going out for a second, but have only noticed this twice (but I've only had the truck a few days). I'm thinking the signs point to a vacuum leak, but I'd like to hear what others may suggest. Would a clogged PCV valve do this? I'm sure there probably more than one thing causing the idle issue, so looking forward to thoughts.

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  • michaelbe387
    michaelbe387 Jan 13, 2013

    Thanks for the suggestions. The check engine light is not on. About 10 mins after driving it the light did come on for like 15 mins. I turned the car off and it hasn't come back on since. I try the PCV and check for vacuum leaks first.

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  • Chevrolet Master
  • 450 Answers

Can of worms here my friend, first thing I would do, replace fuel filter, then , spark plugs, wires, distributor cap/rotor, air cleaner, fuel injector cleaner in gas tank, drygas in fuel tank, higher octane fuel to help mix up the two bottles of stuff I just mentioned, see how all these work, these items are cheap, but necessary, then located on the throttle body is a idle air control valve, which needs replaced no doubt, IAC valve, get it. hope you changed your oil & oil filter, also very important you change the tranmission filter & fluid. so ya see, this is what you purchased a lot of work!!!!!! believe me , it may not end here. good luck

Posted on Jan 13, 2013

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  • michaelbe387
    michaelbe387 Jan 13, 2013

    I got it really cheap so I expected to have to put some effort into it. But I want to keep the fixes cheap if possible as you suggest. Do you think seafoam would be similar to the drygas you mention? The tank was basically empty when I got it so the gas in it is new. (I did change oil and filter twice actually after an engine flush bottle)

  • ken hane Jan 13, 2013

    lets keep it simple mike, you can buy seafoam in a spray can, use it to spray-clean your throttle body, inside, follow what I told you, and then replace your egr valve, and pvc valve, as well, this engine needs all kind of help, follow my lead, I own a 1988 gmc 3/4 ton, I have 42 years experience, my knowledge deserves to be paid for, your getting it free.

  • michaelbe387
    michaelbe387 Jan 15, 2013

    Thanks Ken, I really appreciate the time. Should I use the seafoam to spray the throttle body clean while the engine is running? I had an inspection one time and they did something where they sprayed into the top of the engine (I assume throttle body) to clean it out. Made a lot of white smoke is all I remember. The PCV valve change seemed to settle almost all of the idling issues. I'll continue with some of your other suggestions as well.

  • ken hane Jan 16, 2013

    thats what they did, keep on keepen on mike, a winner never quits !

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  • Chevrolet Master
  • 44,335 Answers

Check the pcv valve as they will gum up if the oil has not been changed regularly. I would also check all vacuum hoses for cracks or breaks

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: 1995 Chevy silverado with a

I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.

Posted on Aug 04, 2008

  • 4 Answers

SOURCE: My camaro is idling at 3k rpm in park

if you are not the original owner then the previous owner may have set the idle high, if you take off the throttle body there should be a little screw that will set the idle by keeping the intake valve open more if you unscrew it then the idle rpm will lower

Posted on Nov 20, 2008

  • 14 Answers

SOURCE: 1995 Chev S10 4.3L V6 rough idle and under power

This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.

What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.

I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.

What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.

Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.

Posted on Dec 24, 2008

haileyscrazy
  • 18 Answers

SOURCE: where is the PCV valve on a 2002 Chevy Impala?

Tech jk is right
I HAD THE SAME PROBLEM IT'S THE FUEL PRESSURE REGULATOR REPLACE IT AND YOUR PROBLEM WIILL GO AWAY

Posted on Jan 13, 2009

  • 32 Answers

SOURCE: 98 Chevy 5.0 fast idle

try cleaning the throttle plate with the right cleaner . from a auto parts store.

Posted on Mar 02, 2009

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