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having trouble with 1991 firebird
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91Fbird
Novice
Jan 19, 2009, 9:04 PM
Post #1 of 6
(2714 views)
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having trouble with 1991 firebird
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My 91 Firebird runs good until it warms up then service engine soon light comes on, it acts like its flooding after the check light comes on. If you hit the gas fast at all it starts to cut out like its flooding. Problem started right out of the blue bought the car recently hasnt been tagged in 3 or 4 years and i'm trying to get it ready to pass inspection and get it tagged so I dont have a way to get it to a more qualified mechanic until then. Havn't tried anything because I dont know where to start. It has its original 3.1 L V6 plan on replacing it with a 350 but need to try and fix it till then. Any advice would be appreciated thanks!
-The Gilley
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 19, 2009, 9:56 PM
Post #2 of 6
(2709 views)
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Re: having trouble with 1991 firebird
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Not sure what ohm values this one has for testing as it's a single wire job apparently or could be a two wire one - some confusion with the look up?? It does dictate the "choke" effect for the fuel delivery thru ECM and worth a shot,
T
_______________
See Figure 1
OPERATION
Most engine functions are affected by the coolant temperature. Determining whether the engine is hot or cold is largely dependent on the temperature of the coolant. An accurate temperature signal to the ECM is supplied by the coolant temperature sensor. The coolant temperature sensor is a thermistor mounted in the engine coolant stream. A thermistor is an electrical device that varies its resistance in relation to changes in temperature. Low coolant temperature produces a high resistance and high coolant temperature produces low resistance. The ECM supplies a signal of 5 volts to the coolant temperature sensor through a resistor in the ECM and measures the voltage. The voltage will be high when the engine is cold and low when the engine is hot.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Drain the cooling system to an appropriate and clean container for reuse.
- Disconnect the electrical wiring from the coolant temperature sensor.
- Remove the coolant temperature sensor.
To install:
- Install the coolant temperature sensor.
- Connect the electrical wiring.
- Fill the cooling system.
- Connect the negative battery cable.
- Start the engine and check for leaks.
 Fig. 1: Coolant temperature sensor. The intake air temperature sensor is similar in appearance
(This post was edited by Tom Greenleaf on Jan 19, 2009, 9:59 PM)
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91Fbird
Novice
Jan 21, 2009, 9:05 AM
Post #3 of 6
(2683 views)
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Re: having trouble with 1991 firebird
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Thanks I believe that could be it the receptacle housing is cracked on that sensor but is it ssupposed to be on the engine block thats the only one i seen 
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Loren Champlain Sr
Veteran
/ Moderator
Jan 21, 2009, 4:12 PM
Post #4 of 6
(2671 views)
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Re: having trouble with 1991 firebird
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The sender you see on the engine block is for the temperature guage, not for the 'computer'.
Loren
SW Washington
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91Fbird
Novice
Jan 21, 2009, 5:39 PM
Post #5 of 6
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Re: having trouble with 1991 firebird
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I see...
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91Fbird
Novice
Feb 3, 2009, 12:31 PM
Post #6 of 6
(2631 views)
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Re: having trouble with 1991 firebird
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Unplugged and plugged the wires back into that sensor and now the problem is worse didn't even have to warm up, I cant even look at the throttle funny or it will start to flood lol should probably get a new one but I need to make sure it is the sensor that you mentioned first
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