1983 Porsche 944 pulsates at idle, I need it to pass CA smog

Asked by Oct 02, 2016 at 02:01 PM about the 1983 Porsche 944 STD Hatchback

Question type: Maintenance & Repair

Car starts up good and runs just fine but once it is warmed up it starts to pulsate when you come to a stop and has a similar issue when letting off the accelarater but is much more noticible at a stop.

2 Answers

254,535

vacuum leak?

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Like Tom above says, a vacuum leak is a strong possibility in a car that old. There are vacuum lines under the intake manifold, and as the car heats up they soften. Changing them all is a smart way to start. Next try cleaning your mass airflow sensor with the correct cleaner. Its delicate, so don't touch it! Just use the spray. If that doesn't help I'd try changing the throttle position sensor, an easy fix (if that's the problem) for around $75 at Rock Auto.

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