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1990 Plymouth Acclaim Problems
The heating, ventilation and AC (HVAC) system may change to defrost mode under heavy engine load conditions when low engine vacuum is produced. This can often be corrected by installing an additional vacuum check valve with reservoir to help stabilize the vacuum supply to the HVAC system.
A squeak type noise may be noted from the front of the vehicle while turning. This is commonly caused by a faulty upper strut bearing. Replacing the failed strut bearing will generally correct this type of concern.
Various driveability concerns can be caused by deposits on the back of the intake valves. Fuel injector cleaner has shown reasonable results cleaning light deposits.
A hesitation on acceleration may be caused by carbon build up on the EGR valve back pressure tube. Cleaning the tube will generally restore proper EGR system operation, eliminating the associated hesitation.