94 wrangler still missing

[magna]

still having problems with the 94 wrangler 2.5 fi, i have replaced the coil , pickup coil and 02 sensor and plugs. after driving around 45 minutes it still bogs down and won't pull past half throttle. runs better than ever up to 45 minutes then doesn't want too pull. only codes showing up are 12 "?" and 33 then 5 and 5. any idea's map sensor? tps? you can smell fuel when bogging starts.

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).

[dave123]

If it only does it hot, i would check for vaporlock. You may also try removing the gas cap while it's acting up. I had an old pontiac that would build negative pressure in the tank and that would relieve it. I ended up drilling a small hole in the gas cap to fix the problem.

[mud4feet]

Here's a little link to decipher your codes:

Diagnostic Trouble Codes

I know the "33" is a common code thrown for those without AC. And "55" basically means "I'm done". 12 was something about coolant temperature sensor.......good luck diagnosing. I HATE computers!!!!!