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1998 Dodge Ram Surging Idle

Tiny
BACON21
  • MEMBER
  • 1998 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 174,000 MILES
I have checked all the vacuum lines, there's no restriction any where. I don't see any leaks and I have been through 2 tps sensors, my idle randomly surges and when in park just runs up to about 3 thousand rpms the cat is bad I'm sure but what could cause this all the electrical connectors also read 5.0v give or take so I dont think I have to much power anywhere. I'm really stuck on this one.



Thanks.
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Wednesday, August 4th, 2010 AT 10:56 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
If the catalytic converter is bad, replace it before there are new problems. Have you checked the idle air control valve (IAC)?
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Friday, August 6th, 2010 AT 12:10 AM
Tiny
BACON21
  • MEMBER
  • 10 POSTS
I cleaned it, I also did a vacuum test today while at work, 25inhg steady I also have noticed that when I go to park it will hang at 3krpms for about 3 secs than idle down at normal
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Sunday, August 8th, 2010 AT 10:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Did cleaning the iac change it a all? Also, have you checked the tps?
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Monday, August 9th, 2010 AT 1:10 AM
Tiny
BACON21
  • MEMBER
  • 10 POSTS
Yes the tps is new it's actually the second new one thats been in there. I feel the IAC may be bad is there nay good way to test it to see if it's working properly?
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-1
Tuesday, August 10th, 2010 AT 1:29 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
You should be able to see it working. Often times, if you remove them and clean them, they work again.
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Wednesday, August 11th, 2010 AT 12:11 AM

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