89 GTUs revs up and down at stop

Rotary#10 · 09-21-2012, 11:26 AM

Be sure all your coil packs have the 10mm nuts on them. Those nuts provide grounding for them. Also its rare for trailing coils to fail. Replace it and see what happens. Your RPMs should come back. After your car is warmed up and at normal operating temps unplug the tps and see if the idle stabilizes. It should. I can say this because I had a GTUs with the same problem. It's very common for tps adjustments and or a vacuum leak if you removed the intake manifolds.

09-21-2012, 11:26 AM	#5
Rotary#10 Rotorhead Join Date: Sep 2008 Location: "the town " Oakland Posts: 219 Rep Power: 17	Be sure all your coil packs have the 10mm nuts on them. Those nuts provide grounding for them. Also its rare for trailing coils to fail. Replace it and see what happens. Your RPMs should come back. After your car is warmed up and at normal operating temps unplug the tps and see if the idle stabilizes. It should. I can say this because I had a GTUs with the same problem. It's very common for tps adjustments and or a vacuum leak if you removed the intake manifolds. __________________ Currently running: 90 GTUs converted to S5 TurboII. Track car. 90 N/A GTUs.. Running project car 89 N/A GTUs in Black #2 10/6/18 Blown coolant seal undergoing rebuild and restomod.

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