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1989 Honda Prelude engine revs to high

Tiny
SQUIIZY
  • MEMBER
  • 1989 HONDA PRELUDE
  • 4 CYL
  • 2WD
  • MANUAL
  • 250,000 MILES
When my engine is at operating temp. The revs are 1000. On warm up revs at 1500rpm.
have had new head rebuild over 12months ago.
all lincages and engin in very good condition.
How do I bring down idle to 700rpm.
the engin is injection model. 2000.

thanks squiizy. I am just a poor boy.
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Tuesday, October 12th, 2010 AT 12:57 AM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test Electronic Air Ctrl. Valve (EFI) On top of engine, look for vacuum leaks also might try dropping it down using the throttle stop screw
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Tuesday, October 12th, 2010 AT 2:06 AM
Tiny
SQUIIZY
  • MEMBER
  • 4 POSTS
Razy. There is no throttle down skrew on my fuel injection engin.
I can resolve the idle by way of the computer but to expensive and reves are to close to the normal retting od 750.
I have heard that I can reverse the spring loaded cap in the EFI valve. This will bring down the reves permanently which is ok for a warm climate.
All other points on my car are excelent.
I have disconected the EFI with the reves coming down to 600. This is good for a manual change. But the warning engin light stays on and the air con. Won't come in due to the reves being low. Will this be ok. To reverce cap. Squiizy.
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Tuesday, October 12th, 2010 AT 10:23 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try adjusting the idle speed thru here


https://www.2carpros.com/forum/automotive_pictures/12900_honda_7.jpg

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Tuesday, October 12th, 2010 AT 10:28 PM
Tiny
SQUIIZY
  • MEMBER
  • 4 POSTS
Razy; I have adjusted this screw right in with reves still high. I thought this was cutting down the fuel flow. Sorry; squiizy
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Tuesday, October 12th, 2010 AT 10:39 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you double check for vacuum leaks-try checking the TPS sensor voltages-see below


https://www.2carpros.com/forum/automotive_pictures/12900_tps_30.jpg

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Tuesday, October 12th, 2010 AT 10:46 PM
Tiny
SQUIIZY
  • MEMBER
  • 4 POSTS
I will try all your suggestions. Thank you very much for your help. Squiizy.
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Tuesday, October 12th, 2010 AT 11:15 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You are very welcome, TY and GL rasmataz-
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Tuesday, October 12th, 2010 AT 11:17 PM

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