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1995 Pontiac Firebird Engine Missing

Tiny
DIRTRACKFAN
  • MEMBER
  • 1995 PONTIAC FIREBIRD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I have a 95' P.F.B. With a 3.4l V6. When I got the vehicle it had a miss. It sat for 2 years with old fuel. I pumped it down and replaced with a full tank of 93 octane and a can of Sea Foam. I changed the fuel filter, plugs, wires, and oil filter. No luck with that. I had it scanned and the only code was MAP sensor, changed that, no luck.

The missing only happens under load if you "put your foot in it ", just over normal acceleration. You can "dry rev" it with little hesitation.
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Saturday, February 21st, 2009 AT 7:39 PM

3 Replies

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

Check Compression and for Vacuum Leaks.

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Saturday, February 21st, 2009 AT 7:57 PM
Tiny
DIRTRACKFAN
  • MEMBER
  • 2 POSTS
All cyl are pretty equal and I sprayed the running engine with starting fluid with no reving.

I forgot to mention that it has a cold air K&N with no air box. I do not see a MAF sensor and called the dealer and they said that there is not one on this vehicle.
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Saturday, February 21st, 2009 AT 8:36 PM
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Have you check the Fuel Pressure? Specs are 41 - 47 psi.

Check out this video for testing proceedure...

https://www.2carpros.com/dia/test_fuel_pressure.htm

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Saturday, February 21st, 2009 AT 9:49 PM

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