Help with my cadillac allante

Asked by Mauricio Apr 27, 2014 at 12:02 AM about the 1990 Cadillac Allante FWD

Question type: Maintenance & Repair

My 1990 allante has the check engine light
on and when I accelerate it starts of very
slow and you could hear a tapping noise in
the motor

4 Answers


This is not related to the tapping noise - but, have you ever replaced the injectors on this car. The original Rochester Injectors WILL fail. Replace with a Bosch model. Easy repair. As for the tapping - check with John at He has an Allante specific repair shop. in New Jersey. Talk with him and he will better identify the problem.

5 people found this helpful.

tapping? like piston knock or tick-tick-tick THE BETTER you describe stuff the easier it is for a reader to help, after all the best diagnostic tools are sound and feel of how the car is running. I also think you are talking about more than one thing happening - like bobkat you may also have a fuel problem but you might try a good brand injector cleaner first , maybe plugs,air filter - these things affect acceleration ( but won't fix the ping/knock/tap/tick - which ever of these that it sounds like)

2 people found this helpful.

The Cadillac 4.5 liter motor in Allantes has hydraulic lifters, not overhead camshafts. They are like most older car engines were designed. It sounds like the lifters have collapsed. Usually the noise will subside after oil gets into them. If the noise won't stop, try some engine oil treatment like STP.

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