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There are multiple things that can go wrong with cruise control, you need to be more specific as to what is wrong with the cruise control in your car.
The ignition module is located in the distributor, under the distributor cap.
The timing on a 1987 Chevy Celebrity is controlled by the engine control module, there is no provision for adjustment.
Where is the ignition control module on a 1987 nissan 300zx
If the cruise control on your 1987 300ZX does not work, you might have an issue with the cruise control fuse or wiring. You could also have a problem with the switch that turns the cruise control on and off.
Timing on a 1987 Celebrity is controlled by the engine control module, computer. There is no provision for adjustment.
The 1987 Chevy Celebrity has distributor less ignition. The timing is controlled by the engine control module and there is no provision for adjustment.
All 1987 to 1990 Chevy Celebrity engines use distributorless ignition. Timing is controlled by the engine control module in conjunction with the ignition module. There is no provision for adjustment.
Timing on a 1987 thru 1990 Chevy Celebrity 2.8/3.1 engine is controlled by the ignition control module along with the engine control module. There is no provision or specification for manually adjusting the timing on these distributor-less models.
"Powertrain Control Module".
under the coil
There is no ignition module on a 1987 5th ave. The spark control computer is on the air cleaner with a vacuum line hooked to it.