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91 s10 2.8v6 217,000 miles. hesitant to start when warmed up. if it does start i have to give it gas to stay running. replaced cap, rotor, plugs and wires
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Clean the MAF sensor. Could also need a tune up, plugs, wires, cap, rotor, fuel filter. Could also have a stopped up catalic converter that needs to be replaced.
When using gas treatment, it's a good idea to pull the spark plugs after 500 miles. Most engine / gas cleaners are effective but the impurities burn off on the plugs and they can become fouled. Another place to look is the distributor cap and rotor. A tiny crack in the cap is all it takes for an engine to run rough. Lastly, inspect the spark plug wires very closely. Look for any bare spots and ensure that they are tight both at the spark plug and at the distributor cap.
how are the tune-up components,if they need replacing this can happen as the extra fuel when cold puts more stress on weak components.(plugs,wires,cap,rotor,air filter,etc)it could also be carbon build up on the back of the intake valves,this can cause the carbon to absorb fuel(like a sponge)until either the car warms up or the carbon is saturated.this can cause a lean condition when cold.the way to correct this is to have a top end fuel service were a chemical is run through the motor to break up the carbon and clean the intake surfaces.
I had the same problem.New plugs, wires, fuel filter, air filter, MASS airflow sensor cleaned and still it would hesitate.It seemed to get worse when warm.Sunday I fixed the problem.Take the distributor cap and rotor off.Under the rotor there is a metal plate held on by two screws.Take the plate off, this will expose the optical Cam sensor.I took a can of MASS airflow cleaner (Plastic safe)(can buy at advanced auto parts) and sprayed heavily. Once it was dry I put it all back together and it runs like new.
My 1996 Astro does the same thing... It has new fuel pump, fuel filter, plugs, wires, cap, rotor, maf sensor, ignition coil, alt., battery, cat converter, im stumped...
Try cleaning the rubber hoses associated with the idle speed stabilisation valve. If that doesn't help, try disconnecting the wiring plug from the same unit, if there is some improvement then replace the unit. You could also try checking the fuel warm up and cold start valves, these should give specific electrical readings on a meter at set temperatures, (I should be able to produce the relevant values and test procedures if you need them- let me know). It's possible that the injectors aren't opening at the correct pressure or that their spray pattern is poor. A fuel injection workshop should be able to service them for you. You could try running some injector cleaner through the system-you simply add it to the gas tank when you fill up. Good luck, Bob.
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