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Amedee
Amedee, Chrysler Technician
Category: Chrysler
Satisfied Customers: 21827
Experience:  ASE Master Technician advanced level specialist. Wisconsin certified emissions state inspector
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What causes at car to cut off - while driving?

Customer Question

What causes at car to cut off - while driving?
Submitted: 3 years ago.
Category: Chrysler
Expert:  Amedee replied 3 years ago.
Hello!

When your engine cuts off, does it start right back up again? Does it seem to cut off when coming to a stop?

Is the check engine light on?

What size engine do you have?
Customer: replied 3 years ago.
V-6 Engine - will start up again when it cuts off - but it just cuts off while you are driving and just when you stop. My daughter drives the car and I think she did mention that the engine light had come on. We had the engine rebuilt about 6 months ago. The same mechanic that did the engine work, if the one that tells us he can't find anything wrong. Help.
Expert:  Amedee replied 3 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.



Check for the following conditions:



Poor connection at PCM or IAC motor. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage.
Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system.
Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.
Vacuum leak. Check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, faulty or incorrectly installed PCV valve, leaks at intake manifold brake booster hose disconnected, oil filler cap, oil level indicator loose or missing, etc..


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
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high

Expert:  Amedee replied 3 years ago.
Hello!

I am just checking up on you.

Did you have any further questions?

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