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1996 Chevy Truck sevice engine soon light

Tiny
PITPAT71802
  • MEMBER
  • 1996 CHEVROLET TRUCK
Engine Mechanical problem
1996 Chevy Truck Four Wheel Drive Automatic

my service engine soon light is on I get code bank 1 and 2 to lean and now the truck runs fine seating in park as soon as I go to make a right turn truck dies but starts right back up what could it be the mass air flow sensor was just replaced plugs and wires was just done
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Monday, November 2nd, 2009 AT 1:40 AM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Monday, November 2nd, 2009 AT 4:38 AM
Tiny
PITPAT71802
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The maf has just been changed
fuel injectors I ran fuel injector cleaner thru already 2 times by adding it to the gas tank

as far as leaky vacum I sprayed carb cleaner on all of them and the motor didnt jump up and down

egr vavle I don't know how how to cheack that and fuel pessure I was going to check today also was going to change the fuel filter due to I dont know how long it had been since its been change

so if you could explain really fast how I can check the egr vavle operation
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Monday, November 2nd, 2009 AT 6:23 AM
Tiny
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You need a vacuum pump hook it up to the vacuum nipple on the EGR valve and pump it to 10inch-the engine will either stall or idle rough
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Monday, November 2nd, 2009 AT 10:58 AM
Tiny
PITPAT71802
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  • 4 POSTS
So if it dies its no good and if it stays running it is good?
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Monday, November 2nd, 2009 AT 12:45 PM
Tiny
RASMATAZ
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If it dies out or idle erractically it means its good-if nothing happens when you pump it up its carboned-up-not opening. Get back with some results to include the other stuffs I've mentioned earlier.
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Monday, November 2nd, 2009 AT 1:04 PM
Tiny
PITPAT71802
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  • 4 POSTS
I just went out and drove the truck and it ran just fine no problems I dont understand thanks for the help I was told that it could be the 0s sensor due to it has a 40 series flow master true dual exhaust?
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Monday, November 2nd, 2009 AT 1:12 PM

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