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Old 12-24-2017, 07:55 PM   #1
twozzie
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Default High revs on idle

I have a new to me 97 NAS D90 V8 4L and it runs well but the revs are high. On start up it sits at 1100 RPM and never really gets below this unless a load is put when shifting to Drive. When I shift back into Park or Neutral, it revs high again. In fact in D, it actually propels itself - yikes.
Its going to the mechanic to have a few oil leaks plugged and to have the high revving looked at, so I dont appear to be a complete numpty (too late) what could cause the revving?
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Old 12-24-2017, 08:10 PM   #2
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Various things. Check that the throttle cable has some free play. Then download a workshop manual and read it.
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Old 12-24-2017, 11:21 PM   #3
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Vaccum leak, icv, or the throttle position switch.
Gad one that had to be plugged into a test book to be reset
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Old 12-25-2017, 01:51 PM   #4
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It is pretty common for Gems engines to need the throttle adaptions reset with T4.
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Old 12-27-2017, 01:37 PM   #5
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Quote:
Originally Posted by jymmiejamz View Post
It is pretty common for Gems engines to need the throttle adaptions reset with T4.
Idle is controlled by the ECU. If the mechanic has a T4 or an Autologic, they can sort it out
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Old 02-26-2018, 11:29 PM   #6
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I have the same issue on my 97 NAS D90. Did you sort it out? Please share if you did. Thank you
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Old 02-27-2018, 08:23 AM   #7
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Quote:
Originally Posted by LQNAS View Post
I have the same issue on my 97 NAS D90. Did you sort it out? Please share if you did. Thank you
Happened to me- tech with test book 4 fixed it
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Old 02-27-2018, 11:38 AM   #8
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Quote:
Originally Posted by LQNAS View Post
I have the same issue on my 97 NAS D90. Did you sort it out? Please share if you did. Thank you
It was a mismash of items. PO had tried to fix something and unplugged some vaccum hoses, by passed, connections and even plugged inlets with screws etc.
Took my mechanic about 4 weeks to resolve, basically replaced all hoses and cables, new fuel pump too, set everything to LR spec. It now idles at 850rpm hot or cold, starts first turn of key and is now passed CA smog.
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