1997 D-90 Idle Speed - Defender Source
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Old October 8th, 2006, 02:39 PM
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Matt Mitchell
Join Date: Sep 2006
Location: Amelia, OH, USA
Posts: 4
Question 1997 D-90 Idle Speed

My 97 D-90 Idles at 1,500 to 2,000 RPM. I had a bad O2 sensor and replaced it (by the way, is there any way to reset the check engine light without an OBDII reader?) with no change. I know on previous years there was an idle speed screw you can adjust. Is there anything on the 97s? If so where exactly is the screw, I could not find it. Also, this engine was replace by the previous owner with a 99 Disco 4.0 at 65K (125K on it now). I bought it from a 3rd party and the seller did not know if this problem existed ever since the engine was replaced. I checked for air leaks and found none that were apparent. Anything else I can do?

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Old October 8th, 2006, 03:38 PM
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Jim Ngo
1994 D90 #80
Join Date: Aug 2006
Location: Salt Lake City, UT
Posts: 118
Try resetting the ECU by disconnecting the battery for 30 seconds or so.

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Old October 10th, 2006, 09:31 AM
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Charles Edwards
1998 V8 50th & 1992 RR LSE 4.2
Join Date: Jul 2004
Location: Jersey
Posts: 5
This sounds like a very similar situation to one that I found myself in last year, it could be an intermittant fault with your throttle position sensor. The link below may be of some help, you will need to find someone with a computer so you can quizz the brain for it's stored settings though...


Hope this helps
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Old October 10th, 2006, 05:03 PM
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Barry O'Mahony
97 D-90 SW LE
Join Date: Dec 2003
Location: Banks, OR
Posts: 277
Originally Posted by ndhlp
by the way, is there any way to reset the check engine light without an OBDII reader?
Nope. But cheap readers can now be had, so pull the code and reset it yourself.
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Old October 11th, 2006, 10:43 AM
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Thomas F
Recently Roverless
Join Date: Mar 2005
Location: Austin, TX, USA
Posts: 112
If you don't want to fork over the $40-$100 to get one, the guys at your local auto store will usually let you use the one they have for free (as long as you don't show up there every weekend).
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