alright so i'm trying to figure out what i need to do or replace to fix these trouble codes.

P0110 Mass Air Flow circuit
P0123 Tp or APP Sensor circuit 1
P1121 Tp sensor high ittermitent voltage
P1441 EVAP flow during non purge

Ok, so the MAF is new and i checked the plug for damage, there was none. I know the tp or App sensor is the crank sensor. Could it be bad? And could the EVAP be from having no air pump? Any thoughts appreciated.

Chris

 

P0110 is not a valid code for your car. Perhpas you meant
P0101 Mass Air Flow (MAF) system performance. You could have an intermittent wiring issue to the sensor and/or connector.

P0123 Throttle Position (TP) sensor circuit high voltage

P1121 Throttle Position (TP) sensor circuit intermittent high voltage

These two have nothing to do with the crank sensor. The TPS is on the side of the throttle body. You should look at the values in real time with a scanner and see if the values are proper and increment smoothly when the accelerator pedal is pushed. The key needs to be ON, but the engine does not have to be running.

P1441 Evaporative Emissions (EVAP) system flow during non-purge.

The round vacuum switch on the RH side of the intake manifold is detecting vacuum when there is not supposed to be any. This could be from the two hoses to the EVAP solenoid being reversed, a stuck open or clogged EVAP solenoid or lines, something in the PCM keeping the solenoid operated (not likely).

 

hmm. thanks. the only reason i said crank is because one of the codes shows tp or app. when i looked up app it told me crank sensor. but i'm not sure. i checked the throttle position sensor and the only thing i saw was it read .75 volts closed. other than that it was working. i'll check those vacuum lines though. thanks

 

Check the voltage on the tps at wot. I get a high voltage code on my 95 Z28
if it gets a feedback higher than 4.7 vdc . I had to slot my tps bolt holes for my 58mm tb get a closed tps feedback of .62 vdc thats what worked on mine.
But, all cars are different , hope it helps.

 

i checked it on the computer and it was fine through WOT. it was just a little high when closed. i may have to adjust it. i think its already slotted

 

The P0123 TPS code sets when the TPS voltage exceeds 4.9V, and the condition exists for more than 1 second. This would typically be an intermittent problem with a short in the TPS sensor or in the harness connector. Doesn't have anything to do with the closed throttle voltage.

 

Let me clarify why I posted what I did. I set my tps at closed thottle to .68/4.8+ wot vdc and went out and hammered it and got a tps high voltage code, drove home and reset it to .62/4.6wot vdc and have not got code for tps after 30 passes at the track and a year of street driving. So changing the closed voltage CHANGED MY WOT VOLTAGE. But again all cars are different.