stall when driving down highway

2002 PONTIAC BONNEVILLE
156,000 MILES
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WHITEYLZ
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  • 5 POSTS
3800 engine k- just dies like u turned key off after 3 to 15 miles usually. other day went 80 miles was fine,next mourning went 6 died. wont restart for hrs. last couple times after dieing had pendin code po101or03. wouldn't start for like 20 hrs cleared code started rite up. that's happened last 3 times (clear code n it starts) heres what I know n have done or cked- new crank sensor-cam sensor-icm-coil packs - used pcm that was flashed- fuel pump - fuel filter. what I can confirm is this-has spark can spray fluid into intake n it runs-all 4 grounds coming out of pcm load test good- noid light for injctors flashes like suppose to-the 3x n 18 x signal from crank cam sensor is good.-has 47psi at fuel rail with key on n 45 psi when running. would ignition switch cause this stallin problem?? oh car dies when unplug maf sensor n wont restart n im sure this shouldn't happen
May 23, 2013 at 3:41 AM
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JDL
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  • 16,098 POSTS
The codes are for the maf sensor. When the engine is running ok, you might peck on the maf sensor, see if engine acts-up.
May 23, 2013 at 4:34 AM
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JDL
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I think your on the right track with that maf sensor.
May 23, 2013 at 4:40 AM
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WHITEYLZ
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Ive tapped on maf n no change also have installed one off my 03 impale which is the same one n still no change
May 23, 2013 at 4:48 AM
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JDL
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My diagnostic aids says to make sure the maf sensor wiring isn't too close to solenoids--relays-- motors-- ignition wires or coil. Check for vacuum leak downstream from maf sensor.

Check your map sensor, ground circuit and vacuum.
May 23, 2013 at 5:34 AM
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WHITEYLZ
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I have verified when car is in stall mode that the 4 grounds from the pcm r load tested n that the injctors have the 12volts n signal with noid light n 45 psi fuel presure with key on n that with scann tool they r tryin to fire.also pulled 9 grounds off that I could find n cleaned them up.. I know there is more but dnt know their locations.have good vacum at fuel presure regulator.. when pull vacum line off fuel presure raises 10 psi.the car runs perfectly when it runs lol my 2 ?s r could a ignition switch cause this problem?? N do u have a diagram of all location of grounds?
May 23, 2013 at 6:34 AM
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WHITEYLZ
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Oh n ive pulled wiring harness loose from mounting point around engine n pulled n tug to try n make engine die or at least act up a little n nothing changes this is while motor is in iys running mode. Was hopin to find a shorted wire
May 23, 2013 at 6:38 AM
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WHITEYLZ
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N one more little piece of info I can give ya is -I put scan tool on it. To freeze frame data when it stalls n the only one that stood out to me was the long term fuel trim which was negative 24.67. Any info is greatly appreciated! Ive bout pulled all my hair out on this one
May 23, 2013 at 6:55 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
My next thought is the map sensor. I hate to see you throw parts at it. I don't know what else to tell you?
May 23, 2013 at 11:45 PM
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