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1999 4 runner fast idle

Changed 02 sensor now fast idle

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Rough idle

I strongly suggest checking your Mass air flow sensor (or clean it with NON-CHLORINATED brake cleaner) as well as your 02 sensor. If that doesn't resolve the issue check your coils. A simple ohms test will indicate functionality of the coils.
With vehicle running, disconnect the mass air flow sensor. If nothing changes, clean and test. No change, replace sensor. There are several ways to test an 02 sensor. The easiest is attaching a volt meter and observing while driving. Another simple way is to remove the O2 sensor and see if the vehicle runs and drives any differently. If so, sensor needs to be replaced! These are the most common causes. Good luck!

Mar 29, 2012 | 2002 Mercedes-Benz M-Class

1 Answer

I have a 96 k1500 chevy truck and have 4 codes that pop up on the check engine light randomly. Codes are ckp A signal intermitent, cmp out of range, idle contol rpm to high, O2 bank 1 sensor 1 insuficent...

O2 sensor cross talk bank to bank irregular, change 02 sensor(s).

Sounds like Idle air control sensor bad, All of your codes interact, I would start with 02 sensor.

I would locate a Tech II and run a diagnosis, eliminate guess work.

Sep 29, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

P0171 just change the mass air flow light came on


Volvo's code - P0171 means: Long-term fuel trim, part load. Long-term fuel trim, idling.

You will need to refer to a workshop manual, to ascertain the correct inspection procedure.


Nov 05, 2009 | 2001 Volvo S60

1 Answer

Bronco idles to fast and now will not shift to drive

well the fast idle is most likely caused by a leaking upper intake runner base gasket, this high idle may be related to the trans no engaging, fix the idle problem by remove the upper intake runners and installing a new base gasket and keep your fingers crossed

Sep 18, 2009 | 1989 Ford F 150

1 Answer

High idle CHevy 350 TBI

check if went from a V6 TO V8 need power two more cylinders

Jun 20, 2009 | 1992 Chevrolet K1500

1 Answer

98 Chevy 5.0 fast idle

try cleaning the throttle plate with the right cleaner . from a auto parts store.

Feb 28, 2009 | 1998 Chevrolet C1500

1 Answer


try the egr valve

Jul 07, 2008 | 1999 Toyota 4Runner

1 Answer

Engine idles lumpy - why?

1.6 zetec surely ,for this year

Jun 23, 2008 | 1999 Ford Escort

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