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Ask Amedee Your Own Question
Amedee
Amedee, Former ASE Master Tech
Category: Car
Satisfied Customers: 24436
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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1988 Isuzu: fast idle and when I turn to the left it shuts

Customer Question

I have an 1988 Isuzu pick-up truck. It has a fast idle and when I turn to the left it shuts-off the engine. How do I fix the idle issue
Submitted: 4 years ago.
Category: Car
Expert:  Amedee replied 4 years ago.
Hello and Welcome to Just Answer!

My name is AMEDEE and I have been working on cars for over 10 years.

Did you still need help?

Is the check engine light on?

are there any codes in the computer?
Customer: replied 4 years ago.

Yes, I still need help.

The check engine light is not on.

I have not checked the codes on the computer.

Expert:  Amedee replied 4 years ago.
You might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this!

Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Possible Causes
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the PCV system and in its related hoses and/or valve
Idle air inlet passage or throttle bore is dirty or full of deposits
IAC valve has failed
MAF sensor is dirty, "skewed" or installed improperly
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high