Question about 1991 Buick Park Avenue
Check the gas cap, is it got loose or not closed properly.Look underneath the car to see if there are any leaks by the gas tank. Then follow the fuel line that travels behind the left door sills. The Fuel Filter is located behind the left rear door seal. See if the Fuel Filter is leaking. In the engine compartment, you might want to take the plastic shrould off the top of the engine to see if the fuel injectors are leaking.If all checked ok, the you will have to get the pressure test done for gasoline line.Get the cam shaft sensor checked, get the vacuum hoses checked.------------
For speedometer problem, check the cruise control transducer or the speed sensor.
Your problem may be caused by the cruise control transducer. The speedometer cable from the transmission goes into the transducer and back out to the speedometer. It is more likely than not that the transducer is causing the problems you are experiencing. The vehicle speed sensor should be located in the back of the speedometer.---------- And for RPM problem.The RPM going constantly up and down.There are few possibilities to be checked.Try cleaning the mass air flow sensor also know as idle air control valve.Its located on throttle body.Try cleaning the maf or \iac and throttle body with throttle cleaner and see if that helps to control rpm.If not then then, i believe, is the throttle control stabilizer located on the intake manifold by the throttle body control, also the unstable RPM's is part of the limp mode system , telling you you are either low coolant, engine oil , transmission oil etc. make sure you check all your fluids.The other possibility for RPM problem can be faulty torque converter solenoid in the trans or a bad torque converter clutch inside the torque converter. It sounds like it is slipping in and out of either a forward gear or the tcc clutch is slipping.One way to help you diagnose this is to drive when you feel the rpms going up and down, lightly press the brake pedal (enough to turn on the brake lights) and see if the rpms stay steady. If they do then the tcc is slipping. (It releases when you press the brake pedal).----------- This are the possibilities to be checked.This will point towards the faulty part, causing the issue.This will help.Thanks.Helpmech.
Posted on Mar 26, 2011
I would first do a tune up and see if that helps, usually it will. Good Luck Tim
Posted on Mar 26, 2011
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Posted on Jan 02, 2017
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