1997 Pontiac Sunfire is missing badly. Stalls and has no power. Also has gas smell. The OBDII codes are Throttle Position Sensor (P0121), Engine Misfire (P0141) and O2 Sensor (P0400).
I have replaced the Throttle position sensor and confirmed the voltages to the sensor; both are good, but this didn't fix the problem.
What else could cause this problem and these codes? Any help is appreciated.
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Re: Missing, stalling Pontiac Sunfire
The OBD II code for P0400 is Exhaust Gas Recirculation Flow Malfunction.
I'm sure the only thing you have left is you may have to replace the EGR valve or check for any leak from the vaccum lines going to to EGR valve.
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Have you had it plugged into a diagnostic system or an OBD2 scanner? This might give you a trouble code to give you a clue as to what the problem is.
Most mechanics charge for this service but you can buy 'very very basic' OBDII scanners online.
Classic bad ground to the fuel pump...Mine did it untill I hard wired it to a switch with a power light. Car stalls light out I throw the switch and im in control but remember to shut it off or your battery will be dead lol.
First off have the ODBII engine codes read out. It will probably tell you that one or more of the following has a code:
1. O2 sensor Bank 1
2. Mass air flow sensor problem
3. Throttle position sensor problem.
4. EGR Valve problem
The OBDII codes will tell you which one it is.
My bet is either 2 or 3 above but would have to read codes first.