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1990 Ford Bronco Engine Idle

Tiny
KSCHIRMAN
  • MEMBER
  • 1990 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
I have a 1990 Ford Bronco with a 5.0L V8 engine & automatic transmission. The vehicle idle's at a very high rpm while in park or neutral. When placed into drive or reverse, the idle drops some.

I have already replaced the IAC valve & map sensor and traced all of the vacuum lines. I have also ran tests to see if the air intake manifold is leaking and everyhitng looks to be mounted correctly.

Any idea's where to go next? Thanks for the help.
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Saturday, April 17th, 2010 AT 5:00 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Did you try spraying carb cleaner or starting fluid on the intake or vacuum lines?

Let me know.
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Tuesday, April 20th, 2010 AT 10:18 AM
Tiny
KSCHIRMAN
  • MEMBER
  • 2 POSTS
Yeah I sprayed carb cleaner everywhere, around the intake, over the vacuum lines, around the canisters, everywhere, nothing changed.

I have pulled the following DTC codes:
KOEO:
Active - 23, 23 (TPS)
History - 11, 11 (Pass)

KOER:
12, 23, 45, 13, 73, 12, 23, 45, 13, 73

Before my first post I had replaced the IAC and MAP due to previous codes. I have ran the voltage tests on the TPS and it appears to be bad, so i'm going to purchase a TPS sensor.

Any thoughts with the KOER codes?

Thanks.
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Tuesday, April 20th, 2010 AT 10:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I question if the tps is going to clear those codes. Replace it and let me know what happens.
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Tuesday, April 20th, 2010 AT 11:22 AM

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