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Check ingine code says there is a air leak somewhere

1999 jimmy check ingine light says that there is a air leak some where.

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Evap leak can be due to a gas cap not tightened fully. Did this code come up after fueling? If yes, have auto parts store erase code for you at no charge.

Posted on Apr 22, 2009

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could be a motor mount or its not running on all cyclinders

Aug 23, 2014 | 1999 Mercury Cougar

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When accelerate my 1999 gmc jimmy pops

Multiple failures will contribute to this symptom. Both mechanical and electrical issues need to be looked at. Check for "Engine light" and any active or stored engine codes. Running a cylinder compression test, fuel line pressure test, exhaust pressure test, check the timing, check for misfire, check for clogged fuel and air filter, defective MAF or MAP sensor, check for vacuum leaks. The more details you can provide. I may be able to help you more.

Feb 24, 2014 | 1997 GMC Jimmy

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Nissan 1999 rpm goes up and down, check ingine light on

get the OBD2 codes read to determine what (and how many) errors are being reported by the check engine light. Most auto parts stores will do this for free, and decipher the codes, sell you the part too!
Best regards
please provide feedback.

Oct 03, 2011 | 1999 Nissan Pathfinder

1 Answer


Sometimes the antitheft security system can turn off the injectors and/or fuel pump when there is a problem in the system. A good indicator is if there is a light somewhere on the dash that reads SECURITY. If you see this, go to this link for info and DO IT YOURSELF solutions.

May 31, 2011 | 1999 GMC Yukon

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Enging reves to 3000 rpm at any time. everything else works. is it possible that the thermotat is malfunctional and the sensers are good. not triping a code at all but eng lite on.

The thermostat will not make the engine rev. All it does is restrict coolant flow when it is below the temperature it is designed to open at. If your "check engine' light is on then there is a problem somewhere. Have you had the car scanned for stored codes?

Feb 22, 2011 | 1995 GMC Jimmy

1 Answer

Replaced mass air flow sensor and check engine light still comes on with same code.

You might have a vacuum leak somewhere. What does the code say? MAF sensor? Probably is, just want to make sure.

Jan 13, 2011 | 1999 Oldsmobile Intrigue

1 Answer

If come to A light or A stop my engine want to stop I have to push on the gass if I don`t it will stop it`s ok is long I don`t STOP.1999 fordr explore 4 door xlt (ingine light is on)

does it start and run at idle in park.
it is probably either a vacuum leak or an idle air control valve,
if it misses and runs rough before it dies maybe a vacuum leak.
if it just idles too low, the iac valve

May 19, 2010 | 1999 Ford Explorer

1 Answer

The check ingine kight is on the mechanic says its

P0420 code represents several issues with the catalyst system. Air leaks at the exhaust manifold or exhaust pipes, catalytic converter needs to be replaced, high engine oil or coolant usage (normally meaning a deeper issue), the front and rear HO2S are leaking, contaminated or age. these codes are for both size motors, the four and the six. Good luck, I hope this can help you solve your issue.

Sep 23, 2009 | 2003 Pontiac Grand Am

1 Answer

Antifreeze leak 1996 gmc jimmy 4.3

sounds like it may be coming from your heater core or one of the hoses that run to it to be leaking in that area

Jan 18, 2009 | 1999 GMC Jimmy

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