1989 Firebird

[pontiacfirebird]

I have a 89 Firebird formula 350 TPI. When i first got the car it ran fine then one day it stalled and since then ive been able to start it and drive it but when i shut it off it wont start again for about 30 minutes. Now it dont start at all unless i use starter fluid then it starts. I thought it was a feul problem so I checked the feul pump and its good, I changed the feul filter and feul pressure regulator didnt fix anything. So I think it might be some dumb senser but I dont know which one. If anyone has any ideas what it could be please let me know.

[T/A JLK]

HI;

Run and No Run Restart!

“Service Engine Soon”

Did you check your cars computer?

Did you put your cars ECM into it’s diagnostic mode and check for any trouble codes that maybe stored in your cars ECM / code 14,15,21,44 etc.

Do the following Checks:

- Throttle Position Sensor (TPS) for sticking or binding or any high TPS         
  voltage with the throttle closed it should read less than {.700 volts}

 - Coolant Temperature Sensor (CTS) for any abnormal voltage         
   {At normal Engine operating temperature [85deg.C to 95deg.C]
    the voltage at the ECM Coolant Sensor Signal circuit will measure
   about 1.5 to 2.0 volts at the ECM] also to check the resistance
   values of the (CTS).
   
   The Approximate (CTS) Resistance Values are as follows:

   210deg.F = 185    Ohm’s
   160deg.F = 450    Ohm’s
   100deg.F = 1,800 Ohm’s
     70deg.F = 3,400 Ohm’s
     40deg.F = 7,500 Ohm’s   
     
- Exhaust Gas Regulator (EGR) for valve seating properly.
- Loose Ignition coil ground / and bare or shorted wires.
- Ignition Pickup Coil resistance and connections.
- Distributor for proper output with a {ST-125} Tester
- For faulty In-tank Fuel Pump Check Valve (The check valve should not allow the fuel too drain back into the tank.)                               

     Hope This Helps 

                          Justin Kwarta

PS. // Also Please Note:
A good rule thumb is; that when you deal with a car with a on board computer you should always try too check your cars ECM and wiring to see if it’s good to go first, before you make any repairs otherwise you can be spending a lot money for replacement parts before you find the problem!