I guess I have never throughly discussed in my other thread what my computer keeps telling the dealership is a MAP sensor problem. My car has been having this problem since July 3rd, and the dealership hasn't been able to track it down. Here are the symptoms:

June 5th, morning: I started it up, and it bucked wildly, absolutely non-responsive to the throttle. It took about 45 seconds to get out of my driveway in reverse. Once out of the driveway and in drive, the car would reluctlantly get over 1000RPMS. I was thinking "Bad Gas" from the seldom-used premium pump on the corner of Tinker AFB. I was able to do fine once getting the car over 1000RPMs. No CEL.

June 5th, lunch: the car had the CEL, stuttered at low rpms, and it was difficult to get over 1000RPMs. I barely backed out of my parking spot, and took it into the dealership.

July 3rd, Lunch: The steering wheel is back in the car, see THIS THREAD. I am told the car is ready, all it needed was a new ECU. I start the car, see the CEL is back on, and pull it back in to the service drive-through 20 feet away.

July 3rd, after work: I go to the dealership to get my loaner vehicle, and see my car parked in the drive-through bay. My service advisor says that the MAP's contacts were cleaned and reseated. I take the car home, happy.

July7th, after work: The car stutters again when giving it gas at 500RPM. It is nearly non-responsive to the throttle. No CEL. It drives fine for the next 20 miles. I stop in to pick up take-out Pei-Wei, and when I return to the car, the CEL is on again, but the car drives fine.

July 10, evening: The service advisor calls me to say my mechanic is going to talk to a Chrysler mechanic tomorrow.

July 11th 9:30PM: I still haven't received a call about the chat with the Chrysler mechanic.

Has anyone experienced stuttering problems like this at idle? Can anyone recommend a diagnostic or solution? The car has always had what sounds like an exhaust leak. Would a (excuse my mechanical ignorance) broken idle air control valve cause funny sounds and problems like this?

Any and all help is appreciated.

 

If the car will idle, get a three or four foot of hose, garden hose is good and place one end on your ear, using the other end as a probe to check the running motor for leaks. I replaced my intake manifold gaskets (phenolic) and had a lousy idle after that due to a wee beastie of a leak. That will at least assist you in checking the source of the noise that you have discussed. Best of luck, Woody. Enjoy

 

Thanks, Woody. I will try that next time I have the car. Even if the CEL is resolved, the sound has to go away. It's becoming so loud, it's embarrassing. -Alex

 

Does the leak sound like a whistling when you accelerate from stop and coming from the engine compartment?

I'd check into MAP sensor and make sure it's properly seated. I had mine pop out and symptom was rough idle, whistling sound, CEL, and lack of power due to car going to limp mode.

 

Here's a stupid question: Is the MAP sensor the one plugged into the "Y" piece?

 

Nope - that's the IAT sensor



The MAP sensor is mounted on the intercooler core and can be seen belownext to the pliers (little black plastic piece)

 

I didn't answer the question, did I? The sound I'm talking about is a sharp, short, repetitive air sound. It increases speed with the RPMs and volume with the amount of throttle.