Question about 1999 GMC Jimmy

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Engine light is on as soon as you start the engine computer says runnung to rich how to remedy theproblem

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Your using to high a quality of oil

Posted on Jul 01, 2009


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My 2003 chevy truck 1500 with a v6 runs good 15miles and after that it starts missing and like something holding it back

IF the "check engine" or "service engine soon" light is on. You can take it to most any auto parts store to get the codes read.

Better yet would be to find someone with an actual scanning tool to see what all of the sensors are reading.

IF there is no check engine or service engine soon light on then it could be quite a few different things wrong.

A plugged catalytic converter is a possibility. Another item that i ran across on 3 different vehicles within a day was a bad coolant temperature sensor. All 3 vehicles ran fine when 1st started, but then slowly started to "load up" or run rich. REAL rich.

Turned out on all 3 vehicles there was NO check engine/service engine soon light but after hooking up the scanning tool all 3 showed the coolant temp sensor was reading -40°!!

Yup, the computer was being told the engine was at 40 BELOW zero. The computer took that info and adjusted the fuel/air mixture and timing to help the engine warm up.

While the engine warmed up, the sensor kept saying it was 40 below and made the engine run rich.

This MAY be the problem, but without a scan tool it's hard to say.

Hope this helps.

Feb 19, 2015 | 2003 Chevrolet Silverado 1500

1 Answer

Adjust air fuel mixture

Air fuel is adjusted by the car's computer and cannot be manually adjusted unless you purchase chips to then re-write code to adjust the mixture amount other parameters. Google Sharktuner by JDS Porsche for more information.

Mar 18, 2014 | 1986 Porsche 928

1 Answer

The engine light comes on, mechanic states that the car reads that it is running rich why

You need a better code reader, ie "Mechanic". The ECM should control "Running rich or lean". Is engine light? Quote, Service SOON or Service NOW. SOON is usually minor, but needs to be found in the codes. "NOW" need to be checked immediately.

Nov 09, 2013 | 2008 Chevrolet Impala LTZ

1 Answer

When I exceed speeds past 35 MPH my 99 GMC JImmy shuts down. And then will start again after 5-10 minutes. And now the service engine soon light is on

Sounds like you need a new fuel pump. The service engine soon light will probably be a code for runnung LEAN. ( Lack of Fuel ) for low fuel delivery when it's needed.

Jul 31, 2011 | GMC Jimmy Cars & Trucks

1 Answer

01 deville running rich. Why?

emission issues. check all vacume lines for cracks. 01..its time for new ones. check all electrical conections e

Feb 19, 2010 | 2001 Cadillac DeVille

1 Answer

Mitsubishi montero stalls, but is able to start

must have a bad o2 sensor need to check with a scanner auto zone and advance auto parts do it for free.

Jan 17, 2010 | 2001 Mitsubishi Montero

1 Answer

Checked at autozone when service engine soon light came on code for knock sensor and fuel running rich came up...are these expensive to repair?

The knock sensor is located under the intake manifold and will be expensive to fix at 5-6 hours labor. The rich code could be a bunch of different things and will need to be hooked up to an actual computer to see what is out of spec.

Jul 07, 2009 | 2001 Mercury Villager

2 Answers

Check light on dash

The check engine light is on because of a problem trhat needs attention. Get the code checked and repaired as soon as you can. It is probably minor now.
RPM Northwest

Jun 10, 2009 | 2006 Hyundai Accent

1 Answer


you need to change the oxygen sensor. it will soon cause you problems. after you need to take it in to  erase the code.

Apr 20, 2009 | 1997 Chrysler Town & Country

1 Answer

2004 aveo wont start

sounds like it was burning real rich if it melted the o3 sensor harness chances are the converter melted inside and is restrickting the exhaust if you unhook the exhaust at manifold and it runs replace converter and fid out what is making it run rich before you burn out new converter

Oct 02, 2008 | 2006 Chevrolet Aveo

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