1999 Pontiac Bonneville stalls and dies

Tiny
DANIELOROARK
  • MEMBER
  • 1999 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • 140,000 MILES
I have 1999 Pontiac Bonneville while driving for about an hour of highway driving it will start to lose power and then will stale dan die. It will normaly take 10 mins to an 1 hour to restart. I have taken it to a pontiac dealership and first the said it was plug, wires, and oxygen sensor. They replaced them and sent me on my way. That didnt fix it. So brought it back and they said it is the crank sensor. So they placed and sent me on. Again didnt fix. Now they replaced the fuel pump and sent me on. And didnt fix it. What do tou think?
Tuesday, July 12th, 2011 AT 12:42 AM

3 Replies

Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Hard to say over the computer, Is the check engine light on/or do you know any codes stored? When the car is failing(not starting) we need to know what is missing, (spark, fuel, pulse) to properly diagnose the problem. Check this link to assist you: https://www.2carpros.com/articles/car-cranks-but-wont-start
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
DANIELOROARK
  • MEMBER
  • 2 POSTS
The code that gets stored is multi cylinder missfire
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfires-is normally caused by vacuum leaks and contaminated fuel-

https://www.2carpros.com/articles/car-cranks-but-wont-start

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
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Monday, November 5th, 2018 AT 7:07 PM

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