Q: Car idles; must be put in neutral at red lights. 1985 Pontiac Fiero

asked by on

I use my car for general driving, but it is not running very well. The other day I happened to meet a mechanic while I was in town and he, too, has a Fiero. He commented that the really nice thing about them is that they are easy to fix and repair. My car has an idling problem. If I do not put it into neutral at red lights and stop signs, it will die. When I'm driving on the interstate, it is difficult to control my car. It becomes very shaky when I reach 60 mph and then becomes very difficult to steer. The car acts like it has its own mind. It gives that feeling like there are a lot of loose screws that need tightening. In your experience, what is causing these problems?

A: Theses are probably two separate issues. Th...

Theses are probably two separate issues. The poor idle and stalling have numerous potential causes, but the first that come to mind is a vacuum leak. Vacuum leaks allow unmetered air to enter the engine, resulting in rough idle and/or stalling. One of the other things that comes to mind is a faulty idle air control valve (IAC).

As the name implies, the IAC is a stepper motor designed to regulate idle speed. A faulty IAC can result in an erratic idle and/or stalling. The shaking above 60 mph also has many possible causes. It could be something as simple as a bent rim or worn suspension part. The best advice I can give is to have the rough idling issue inspected by a trained technician, like one from YourMechanic.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Using the 3 2 1 Gears in an automatic.

They are there for a reason. The transmission is controlled by a computer. It will not let you cause damage. You have to look at it from a perspective that it's there to prevent shifts, and not to force a...

Q: Truck not down shifting into lower gear in wot

The shift down linkage should first be checked at the throttle lever to see if it is adjusted and working properly. Check the cable to see if it is broken. If the cable is okay, then the problem is inside...

Q: Steering issues

It is possible that the play you are feeling in your steering wheel may be related to worn out wheel bearings. The wheel bearings may not be noticeable in the steering wheel when the vehicle is stopped or parked,...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.