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Ive changed the rotor distributor cap plugs and plug wires engine coolant temp sensor on thermostat housing and the egr valve have cleaned the idle air control valve as well on my 1991 chevy s10 2.5 i

Please help me I need this truck fixed asap have spent well over 200 already

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  • Austyn Goodman
    Austyn Goodman Nov 23, 2014

    Hi john pace, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

  • john pace
    john pace Nov 23, 2014

    it is a 1990 s10 2.5 ive replaced the plugs wires temp sensor on thermostat ousing cap rotor and egr valve and cleaned the idle air control valve as well it starts fine and runs it just idles rough and stlls when touchthe gas

  • john pace
    john pace Nov 24, 2014

    how can i check the intake gasket for a leak

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Sounds like there either may be a fuel issue or it could be a leaky intake gasket.

Posted on Nov 24, 2014

Testimonial: "how can you tell if your intake is leaking without replacing it"

  • john pace
    john pace Nov 24, 2014

    i cant see any antifreeze or gas leaks anywhere on the intake gasket or throttle body at all

  • john pace
    john pace Nov 26, 2014

    i just had a friend thats a mechaniell the front two cyliners on my 2.5 are misfiring new plugs wires plugs cap rotor temp snesor on thermostat housing egr valve ad idle air control valve isnew as well please tell me what would cause that

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More info needed. Will start and run...what do you need to know

Posted on Nov 23, 2014

Testimonial: "it starts fine idles like it has a miss no vacuum leaks vacuum tested perfect fuel pressure is good egr new cap new rotor new idle air control valve new temp sensor in thermostat housing new plugs and wires are new as well please help"

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Did you replace the thermostat? Doesn't sound like it. There is no anti freeze left in the core, so you have no heat. Anything more might be another head gasket. Sorry.

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check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

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Hello,
your problem appears to be the idle control motor located on the air intake manifold it is a small motor that goes bad quite often. Other items that can cause this is a bad /clogged air filter or a tune up (spark plugs and wires), or clogged fuel injectors. to clean the injectors you can buy a container of fuel system cleaner and pour it into the gas tank and as you drive it cleans the system.

Once the fuel system is cleaned via a tankful of cleaner & gas then the idle controller motor would be next on the list to be replaced.

Good Luck !
Rich Lilja

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