Question about 1991 Eagle Talon

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Idle varing from 2200 rpm to 700 rpm - 1991 Eagle Talon

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  • tschmidek Nov 16, 2009

    I checked for codes and there is none.

  • tschmidek Nov 17, 2009

    Ive checked for codes and there none, what next?

  • tschmidek Nov 22, 2009

    thanks I'll try that

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This could be a number of issues. First thing I would do is to disconnect the electrical connectors on your engine (with it turned off), and spray electrical contact cleaner onto the connectors. Let it sit for 20 minutes before plugging them in. This will clean them up and help them read more accurately. Get air intake and throttle body cleaner, and spray a fine mist into the intake pipe to clean the mass airflow sensor. Don't overdo it - you don't want to soak the sensing element.

Next, get two cans of a product called Seafoam at the parts store. Dump one entire can into your gas tank and fill up on top of it. Take the other can, pour half in your oil, and half in a mug. Pull a vacuum line off the intake manifold and feel for suction with the engine running. Have a second person in the car to hold the RPM at about 2000, and dip the vacuum line into the mug of Seafoam so it can **** it up (it'll stumble and want to shut off, but that's normal and that is why the other person is keeping the revs up). Once it's all ingested (it won't take more than a few seconds) let it run for 15 seconds so it can circulate through the engine, then shut it down for 15 minutes so it can soak and go to work. Start it back up (it may start hard), and rev it back up to 2-3000 RPM. You'll get a tremendous smoke cloud out the back of the car. Let it come back to idle, and rev it a couple times a minute. Do this for 10 minutes or so, and then let it idle. It'll smoke for awhile as it all burns off but the smoking will stop.

Drive another 100 miles or so and then change the oil and oil filter.

What you are doing is this - by putting Seafoam into the gas tank, you're taking condensation out of the tank and gas, cleaning the lines, the filter, the injectors, the rail, and the combustion chamber domes. By putting it in the oil, it breaks down oil sludge, which happens in any engine, but moreso if you have a TSi with a turbo. The sludge will be broken down and collect in solution in the pan. When you change the oil and filter, you get it all out and replace it with fresh, zero-sludge oil. By ingesting it into the vacuum line, you put Seafoam through the airways of the engine. It burns off carbon deposits from the valves, pistons, idle-air control motor, EGR system, etc, so that everything flows and breathes more easily. I've used this many times and found combinations of better mpg, better response in the engine, apparent power gains (from freeing up lost power due to any of the above issues that Seafoam gets rid of), and smoother operation. My bet is that this will get your engine nice and cleaned out and help the car run much better overall.

Posted on Nov 17, 2009

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This is a common problem with your car. In almost every instance it is a fuel air mix problem causing the erratic idle. The first thing we should do is see if there are any codes stored in the PCM. To do this, cycle the ignition switch On-Off-On-Off-On within 5 seconds. Then count the number of times the Malfunction Indicator Lamp (Check Engine Lamp) on the instrument panel flashes on and off. The number of flashes represents the diagnostic trouble code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate individual trouble codes. Once we know what codes are stored, we can go from there.
If there are no codes stored, I would try cleaning out the throttle body. A lot of times this is all that is needed to correct a problem like this. Your local auto parts chain can intpret the codes at no charge. IE: Advance or auto zone. I hope you find this very helpful! Good Luck!

Posted on Nov 16, 2009

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NGEC0549
PREPARATION
NGEC0549S01
1) Make sure that the following parts are in good order.
I Battery
I Ignition system
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I ECM harness connector
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SEF976U
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SEF977U
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SEF217U
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SEF978U
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SEF975R
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GI
MA
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LC
FE
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MT
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PD
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ST
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