Question about 1991 Lexus LS 400
You have a vacuum leak that is causing the idle to fluctuate and remain high. Check the rubber intake boots on the intake system for cracks or leaks and also check ALL vacuum hoses for the same. I'm betting a hose has cracked and is causing the IAC motor to try and compensat for the vacuum leak.
It was a bad call for someone to suggest the MAF replacement.
Posted on Sep 15, 2010
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Jun 05, 2015 | 1996 Honda Civic
Jan 07, 2014 | 1993 Ford Festiva
Mar 30, 2013 | Chevrolet Silverado 1500 Cars & Trucks
Dec 24, 2010 | 1993 Chevrolet S-10 Blazer
Aug 19, 2010 | Lexus LS 400 Cars & Trucks
Jun 22, 2009 | 1993 Chevrolet C1500
83 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: