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post #1 of 3 (permalink) Old 01-21-08, 05:13 PM Thread Starter
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Topaz won't idle, poor mileage

Just replaced a cracked exhaust manifold on an 88 Topaz. Now it won't idle, gets bad gas mileage, runs rough, and black soot is coming out of exhaust. Fuel pressure varies from 50 to 55 lbs. Had a MAP sensor code and replaced with a used one. Also replaced MAP hose. Didn't help. Any ideas? Also, shouldn't codes clear when battery is disconnected?

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post #2 of 3 (permalink) Old 03-06-08, 07:56 PM
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Re: Topaz won't idle, poor mileage

If the code wasn't fixed, reconnecting the battery won't get rid of the code. Only when you fix the problem and reflash the system will the code stay away. I suggest a Tune up with new plugs & wires. A compression check on all the cylinders. Black soot generally means your burning oil, so worst case would be you have a piston ring worn. To cure the idle - replace the TPS and/or IAC sensors.

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post #3 of 3 (permalink) Old 03-15-08, 06:10 PM
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Exclamation Re: Topaz won't idle, poor mileage

Quote:
Originally Posted by 360ci View Post
If the code wasn't fixed, reconnecting the battery won't get rid of the code. Only when you fix the problem and reflash the system will the code stay away. I suggest a Tune up with new plugs & wires. A compression check on all the cylinders. Black soot generally means your burning oil, so worst case would be you have a piston ring worn. To cure the idle - replace the TPS and/or IAC sensors.
Blue smoke means oil burning. Black soot indicates an overly rich mixture, which would be the result of a bad MAP sensor, which Brukh said he has. Never replace a MAP sensor with a used one. Read this thread that I replied to a while back. It details how to test the MAP sensor.

86 Tempo- rough idle, poor mileage, soot in exhaust

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