1996 Dodge Intrepid low RPM

Tiny
SIWYTOM17
  • MEMBER
  • 1996 DODGE INTREPID
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 94,000 MILES
While driving the engine shuts down by itslef. I then start the car and it starts fine. The problem reoccurs a couple dys later. The RPM is too low, when the car is in drive but stopped the RPM is 500. When I put it in neutral, the RPM goes to 700.
Do you
have the same problem?
Yes
No
Friday, June 18th, 2010 AT 7:12 PM

4 Replies

Tiny
SIWYTOM17
  • MEMBER
Was this
answer
helpful?
Yes
No
Friday, June 18th, 2010 AT 7:14 PM
Tiny
CARADIODOC
  • EXPERT
Hi siwytom17. Was the battery recently disconnected or run dead? If so, "minimum throttle" must be relearned before the Engine Computer will know when it must be in control of idle speed. There are things you can do too to determine if the Automatic Idle Speed motor is working.

Caradiodoc
Was this
answer
helpful?
Yes
No
Friday, June 18th, 2010 AT 7:26 PM
Tiny
SIWYTOM17
  • MEMBER
What are these things that must be determined?
Was this
answer
helpful?
Yes
No
Friday, June 18th, 2010 AT 7:53 PM
Tiny
CARADIODOC
  • EXPERT
First of all, when you start the engine, the idle speed is supposed to go up to around 1500 rpm for a couple of seconds, then come back down to around 800 rpm. That "idle flareup" proves the Automatic Idle Speed motor is working and the computer has control of it. On some engines that idle flareup won't occur if minimum throttle is lost from memory.

The second test involves disconnecting a fuel injector while the engine is idling. Engine speed will drop at first, and the computer will respond by bumping it back up. The same thing will happen if a second and third injector is unplugged. You can do the same thing by shorting out a spark plug wire, but don't do that for long because the unburned fuel will overheat the catalytic converter very quickly.

If you think minimum throttle has been lost from memory, the relearn procedure is very complicated. :) Drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals. That will meet the conditions for the computer to know your foot is off the gas pedal. It will memorize the voltage reading from the throttle position sensor. From then on, whenever it sees the same voltage, it will know it must be in control of idle speed. Until then, the engine will typically stall at stop signs due to idling to slowly. The problem can be overcome by jsut holding the gas pedal down 1/4".

Caradiodoc
Was this
answer
helpful?
Yes
No
Saturday, June 19th, 2010 AT 5:32 AM

Please login or register to post a reply.

Recommended Guides