My car stalls when put into gear and sometimes while starting to drive

Tiny
WILDMANN98
  • MEMBER
  • 1992 PONTIAC FIREBIRD
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 250 MILES
I have a 1992 firebird throttle body. Sometimes my car stalls when I put it into gear and sometimes after being at a stop, when I take off the car stalls. I have replaced the idle air control valve twice, fuel pump twice, ( my fuel pressure is at 8, both now and with the first fuel pump, changed maps sensor, throttle position sensor twice, both injectors, checked for vaccum leaks, and fuel regulator. My next move is the fuel filter. A mechanic told me it may not be fuel filter due to it happening sometimes.I thinking its maybe half clogged, any suggestions what to do next. Running out of ideas.
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Thursday, June 12th, 2014 AT 8:45 PM

5 Replies

Tiny
TY ANDERSON
  • EXPERT
It really sounds like a vacuum leak. How did you check for a vacuum leak?
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Thursday, June 12th, 2014 AT 8:59 PM
Tiny
WILDMANN98
  • MEMBER
I took it to tech tune. And they said that thats the first thing they looked for, found one and replaced the gasket
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Thursday, June 12th, 2014 AT 9:33 PM
Tiny
WILDMANN98
  • MEMBER
Most people think fuel filter. Since its inline. Easy to get to. Then thats means everything I could think of.I have tried.
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Thursday, June 12th, 2014 AT 9:34 PM
Tiny
WILDMANN98
  • MEMBER
Engine light comes on and stayes on I have a code 44
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Thursday, June 12th, 2014 AT 9:36 PM
Tiny
TY ANDERSON
  • EXPERT
Code 44 is a "lean exhaust indication" meaning either the o2 sensor is stuck lean or there is a vacuum leak causing the fuel mixture to be too lean or in other words too much air to fuel ratio. One way I check for vacuum leaks is while the engine is running spray starting fluid on all the intake gaskets. Meaning the throttle body gasket, intake gasket and spray briefly listening for an increase in engine rpm. Another way is with a smoker tool. This tool puts out smoke and when you seal it off on the throttle body it fills the intake with smoke and any smoke leaking out of a gasket or vacuum hose will be visible.
Inspect all the vacuum hoses and gaskets for issues. Spraying with starting fluid (aerosol can) is probably your best bet.
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Friday, June 13th, 2014 AT 9:51 AM

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