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1998 Pontiac Grand Am Car Problems

Tiny
DRB3BOY_21
  • MEMBER
  • 1998 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • MANUAL
  • 128,000 MILES
My Pontiac grand am sometimes will start and run fine. Then sometimes it will start and run like crap absolutely no power and stalls out if you let go of the gas. Then sometimes it wont start at all if you dont press the gas medal awhile it is trying to start.
Thats pretty much the basic. Ive checked a few things like plugs and wires and replaced. Still the same problems.

I also have a engine code P0420. Catalyst Efficiency Below threshold bank 1. Is that something to do with the catalytic convertic. If so does that mean it needs to be replaced. Just want to make sure before I do. Thanks
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Wednesday, December 12th, 2007 AT 1:56 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0420 in most cases, is an emissions issue, not a performance issue that affects the way the engine runs.

You might want to have the exhaust sniffed with a gas analyzer before and after the converter to confirm that the gases are being scrubbed thru the exhaust system. If not could be the converter or an oxygen sensor/s problem.

Also have the coolant temperature and throttle position sensors and idle air control valve check.
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Wednesday, December 12th, 2007 AT 2:15 PM

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