Mechanics

RPM DROP AND OCCAISIONAL STALLING

1998 Dodge Avenger

Engine Performance problem
1998 Dodge Avenger 6 cyl Front Wheel Drive Automatic 250k miles

My car has been acting up for about a year or so, Ive done alot to try to get it to work properly. Spent 1000$ for a tune up with all of the symptoms in mind, regular use of fuel treatments and injector cleaners, and now im down to replacing parts.

Anyway, here's the scenario:

Going about 30 km/h or less when very minimal pressure on the gas is applied. Taking pressure off the gas to stop, coast or even accelerating in between traffic, engine RPMs drop right to about 100 or so and then sometimes it stalls and sometimes it recovers. Also happens in reverse. Another symptom is going about 60 km/h steady, the car will feel like its jolting back and forth, also with minimal gas pressure applied.

Recently, We have cleaned the Air Idle Control and the entire Throttle Body, then replaced the AIC(not convinced that we calibrated it properly we got a whole different one from Pick and Pull), tried to replace the TPS but none of the models fit properly, so Pick and Pull : P got a different one, got a new PCV valve, and replaced gasket which was ripped in two places that was apparently replaced and paid for during the tune up. The Intake manifold gasket. This weekend I grabbed a whole different Throttle Body from a 98 Sebring, which is the exact same engine. Thinking the throttle body may have been worn out. But still the same results. : (

What do you suggest?
Avatar
Jburtch19
September 14, 2009.



Hello and thanks for the donation!

Are there any service lamps illuminated in the instrument panel? (I.E. Check engine etc.)

Bluelightnin6
Sep 16, 2009.
No lights and no error codes from when I used a scan tool

Tiny
Jburtch19
Sep 16, 2009.
Check for vacuum leaks under the hood. What happens when you put the vehicle in Neutral? Does it still stall out or idle low?

Bluelightnin6
Sep 16, 2009.
I have to figure out how to check for vacuum leaks and when its in neutral it idles higher than it does in drive or reverse. But nothing unusual

Tiny
Jburtch19
Sep 16, 2009.
Go ahead and check out these components listed below, they can all cause faulty idleing.


http://www.2carpros.com/forum/automotive_pictures/261618_Noname_976.jpg


Bluelightnin6
Sep 16, 2009.
Its not necessarily idling improperly. It idles fine until I tap the gas and take my foot off, going slow or from rest

Tiny
Jburtch19
Sep 17, 2009.
Ok, another tech. Brought up to check the inside of distributor to see if the coil is good and ensure the small spring on the tip is still in place.

Bluelightnin6
Sep 17, 2009.
Ill have a look at it and get back to you

Tiny
Jburtch19
Sep 17, 2009.
I had a look under the hood and the distributer looks pretty hard to get at. We replaced a gasket for the EGR pipe connector and it seems to be doing a bit better but same problem.

Tiny
Jburtch19
Sep 21, 2009.
Jburtch,

what was the final fix to the rpm drop problem you explained above. I have a 1999 Dodge Avenger and I have the same exact problem. My mechanic can't figure out what the problem is. Please help.

Thanks,
Art
pylotgroove@email. Com

Tiny
Arthur40
May 4, 2012.
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