1991 Pontiac Firebird turns over but won't start

Tiny
GAMSO
  • MEMBER
  • 1991 PONTIAC FIREBIRD
Engine Mechanical problem
1991 Pontiac Firebird 6 cyl Two Wheel Drive Automatic 189k miles

i bought this car about a week ago, absolutely fell in love. It drove just fine for about a day and then it started to bog down and would go a maximum of 20-30 mph give it gas just wouldn't go faster than that, so we thought there was seriously something wrong but we drove it a couple hours later and it was back to normal.

the next day it started up. And then died. Turned it over and over it wouldnt start. Waited about 15 min it started up took it for a drive and it started to bog down again. So we parked it and planned on taking it to someone to figure out what the deal was. Now it won't start at all but it will still turn over. We've replaced the fuel filter, checked the air filter it was fine, checked the fuel pump its still running fine, & we've replaced the MAP sensor, it appears to have brand new plug wires. Still won't start.

do you have any ideas that could be wrong that we've missed?

(we've thought about replacing the spark plugs but I kinda want a better idea of the problem 1st)
Do you
have the same problem?
Yes
No
Tuesday, November 25th, 2008 AT 5:01 PM

3 Replies

Tiny
KEVIN12881
  • MEMBER
Check the electric ignition switch on sterring colomn. Loosen steering colomn and drop it down. You will see a metal wire that goes to a little box. That box is a pain to remove, but maybe you can play with it and see if it starts. This is probly not your problem. My 95 trans am is riddle with electrical problems, a new one every month but the motor is great.
Was this
answer
helpful?
Yes
No
Tuesday, November 25th, 2008 AT 5:32 PM
Tiny
GAMSO
  • MEMBER
Hmm. Well this might help a little to the problem. We borrowed a obd thing from a friend and it showed these codes that are supposed to be the problems. But I don't know does this help? Maybe? Lol

OBD CODES:
33 MAP sensor voltage was too high for 4.8 seconds when throttle angle was less than 2%

32 The ECM opens each EGR control valve during deceleration and monitors the change in manifold vacuum. The code sets when the change in manifold vacuum is outside the normal range.

45 Oxygen sensor voltage was over 0.7 volts for 50 seconds in closed loop operation with a throttle angle between 3% and 45%.

44 Oxygen sensor voltage was under 0.2 volts for at least 60 seconds of closed loop operation.
Was this
answer
helpful?
Yes
No
Tuesday, November 25th, 2008 AT 7:25 PM
Tiny
KEVIN12881
  • MEMBER
Go here

https://www.2carpros.com/trouble_codes/obd2
Was this
answer
helpful?
Yes
No
Tuesday, November 25th, 2008 AT 8:00 PM

Please login or register to post a reply.

Sponsored links