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Idle speed issue

Tiny
FIXITMR
  • MECHANIC
  • 1995 PONTIAC TRANSPORT
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 225,000 MILES
Picked up a 95 transport 3800 plastic upper intake that has been sitting for some time. It runs fine but the idle speed increases when warmed up to temp. It goes from 700 up to 2000. Turning off and restarting brings it back down but it then rises again within 5 min or less. Check engine light is on but I have not got codes.
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Tuesday, February 9th, 2016 AT 12:49 AM

9 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Take it to the parts store to get codes. You can start by getting a can of throttle body cleaner and cleaning the throttle body on both sides. Removing it to clean it would be best.
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Tuesday, February 9th, 2016 AT 5:32 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Anything special about getting codes? I got pre 96 code reader which just jumper read codes from engine light?
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Tuesday, February 9th, 2016 AT 10:35 AM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Yes, count the flashes
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Tuesday, February 9th, 2016 AT 10:37 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
No luck yet my reader seems to have different pins then the under dash connector! But I did notice 1 thing testing the idle again and that it rises when I put it in gear after starting to warm up. It also rises and falls 300rpm sometimes just sitting in park. Maybe it just needs some driving the van was sitting a long time 6 mths or so and it had sat for how long before the previous owner bought it.
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Wednesday, February 10th, 2016 AT 4:33 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Ok found out from net this yr has weird system for terminal access cant read flashes scan tool only so I guess i'll try autostore.
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Thursday, February 11th, 2016 AT 12:16 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Aint got to store yet dont trust it yet. But as I mentioned before, idle rises after initial fast idle start and then slowdown and it generally happens when I put it in/out of gear several times. Returns to normal if I shut off and restart. So as a whim, I disconected the IAC plug when it was warmed up/idle was correct. It did NOT raise after that. Gonna see if will run cold tomorrow with disconnect.
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Thursday, February 11th, 2016 AT 4:49 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Ok, sounds good
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Thursday, February 11th, 2016 AT 4:50 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Took it for a ride today from cold start idle was ok after I pedaled it for 30 secs i'm gonna call that good for now I found another problem something is wrong with steering it veers on its own! He said he hit a big pothole so maybe rack is loose?
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Friday, February 12th, 2016 AT 4:07 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
I don't think it's loose unless you feel a lot of play in the steering wheel. Could just need a wheel alignment done.
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Saturday, February 13th, 2016 AT 4:09 AM

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