Question about 1995 Buick LeSabre

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Po101 code replaced maf and ecm scanner starts at 6 to 9 grams per sec runs fine then drop to 0 grams runs rough

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Check wiring

Posted on Jun 29, 2009


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My 2002 dodge ram 2500 with 5.9 starts fine then after a few minutes it starts coughing n running rough an if you pump the pedal for Lil bit n it warmss up then it runs fine?

run the fault codes and look for problem MAF/Vaf sensors and ambient temperature sensors not closing down the fuel rich circuit in the ECM until you upset the input by the pedal movement

Jul 09, 2015 | Dodge Cars & Trucks

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08 ford focus will start but not stay running

give it some gas when it starts if stays running replace iac motor if not check maf sensor reading should be 6-8 grams per second.

Oct 20, 2011 | 2008 Ford Focus

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Had codepo101 , replaced MAF sensor, cleaned air filter. ran it fora couple miles , service engine light came back on . code po101 back. any ideas??

First make sure the air filter is new or at least clean. If you are using an aftermarket enhancement air filter (like K&N) make sure it isn't over-oiled (the oil will affect the sensors in the MAF) (mass air flow), and contaminate the reading of air volume going to the engine. If the ECM can't monitor or regulate the air flow it will set this code and ignore the input form the MAF. In some cases the MAF wiring was to blame, bad connections, or corrosion.

Jan 29, 2011 | Chevrolet Blazer Cars & Trucks

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2001 Mazda MPV, 2.5L eng. During accelerating on to highway, van lost power. Van continued to operate but with little power available. I have no engine light and my code "checker" shows PASS (no...

looks like not enough fuel pressure, check the fuel filter.
and the fuel pump pressure.with car running 60 psi
the pump is located at the rear seat driver side you have to remove the carpet to access the cover. if the fuel pressure checked "OK" suspect defective maf sensor (sometimes defective maf sensor do not show errors codes)another way to test is disconecting the maf sensor and start the car (computer goes to limp in mode) and works little better,or check by scanner idle= low grams per seconds and increase when accelerate.

May 02, 2017 | 2001 Mazda MPV

1 Answer

2000 GMC Safari van v6 180,000 miles. 2 years running po420 code comes up and reset with a code reader. Works good for that. Slight miss at 60mph plus loaded and pulling, so I drive at 58mph. Then the...

P0101 is the MAF sensor and if it has even a tiny amountof crud on it, it can keep the dar from running. clean with ELECTRONICS cleaner not carb/brake spray.

P0300 is multiple misfire detected. Sound like it might need tune-up parts

P0420 is the catalyst system bank 1 low efficiency.

I would start with changing the plugs, wires, cap and rotor. And clean the MAF sensor with the proper cleaner. Then see if the car starts and idles. If it does then clear the codes. If it doesn't run right then I would suspect the MAF sensor is kaput. The P0420 code can be caused by a poorly running engine.

Dec 31, 2010 | GMC Safari Cars & Trucks

1 Answer

Code po101, hard start when hot (have to hold W.O.T. to start) & stumbles on accelertion. Changed MASS sensor, no help.

Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.  I would try cleaning out your MAF sensor with some carb cleaner and reseting the check engine light to see if it comes back on.  If it does, get back on here and let us know and we will walk you through some other things you can try.  Cleaning it out will be the easiest/cheapest thing for you to try right now.  Good luck.  Thanks for an honest rating and for using FixYa.   

May 22, 2009 | 2003 Chevrolet Suburban 1500

3 Answers

2000 bonneville w/3600 v-6 and 99000 miles never had problems, original owner. stalls sporadically but no codes come up on diagnostic. acts like a loose connection, feels like running out of fuel. NEED...

i had the same problem a few months ago. check your fuel filter. mine was on the car for some time and after replaceing it, car runs great. hope this helps. i would also check your air cleaner. if to dirty will run rich and with a dirty fuel filter your car will stall.

Mar 23, 2009 | 2000 Pontiac Bonneville

1 Answer

4.3 Liter V-6 Idles rough when in gear, runs fine on highway.

Can you check fuel trims at idle and under load?
If fuel trim is high at low speed and load, look for a vacuum leak.
If fuel trim is high at high speed and loads, look for fuel volumn problem or restriction.
If fuel trim is high at all speeds and loads look for pcm input fault, maybe a maf sensor problem?
If fuel trim is negative low speed and load, look for fuel pressure regulator or injector leak. If fuel trim is negative at all speeds and loads check ect and iac.

If you have the spider fuel system, that system is noted for problems. key on engine off, 60--66 psi fuel pressure.

Mar 06, 2017 | 1999 Chevrolet Silverado 1500

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