code 51. stalls when pressing on gas pedal.

[stew_7mgte]

Car has hks fcon and vpc plus more but those should be the two to worry about. I have checked and verified all the vacuum lines are correctly routed and i have no leaks. I am in the process of fixing a code 51 but am wondering will that cause the car to idle rough and almost stall when first pressing on the gas pedal? Thats my only code aswell. I know the vpc is working because if i adjust the idle knob too rich or lean the car will stall. Also timing is dead on.

 

[stew_7mgte]

Ok i tested my map sensors and they are receiving and sending signal but no change when i unplug them with the car running? Weird. Maybe its a fuel pressure issue? But when i drove it around the block today it seemed perfectly fine, until idle or sudden opening of the throttle... anybody?

 

[Nick M]

51 indicates the throttle is open to the PCM. Well, the fault is letting you know the throttle is open. But there is a signal for that from the IDL contacts. You said if you adjust rich or lean it stalls. So what makes you think nothing is wrong with the settings?

 

[stew_7mgte]

There could be something wrong with the settings, but i have all the knobs at 12 o clock position. What my question was could a code 51 or misadjusted tps sensors cause my problem or not.

 

[Poodles]

51

Switch Signal

Diagnosis •No "IDL" signal, "NSW" signal or "A/C" signal to ECU, during diagnosis check.
Trouble Area •A/C switch circuit
•A/C switch
•A/C amplifier
•Throttle position sensor circuit
•Throttle position sensor
•ECU

 

[jetjock]

I could 'splain some things but instead here's an idea: why don't fix the code and see what happens. I mean, you're going to fix it anyway right?

 

[IJ.]

I could 'splain some things but instead here's an idea: why don't fix the code and see what happens. I mean, you're going to fix it anyway right?

Don't be getting all logical and stuff JJ

 

[stew_7mgte]

Yea trying to fix it but for some reason my tps is not cooperating with me. I was able to get my hands on a brand new afm for really cheap so im going to put it back in and see if my stalling goes away. But i have a bigger turbo with stock injectors, wont i just hit fuel cut quicker that way?

 

[Poodles]

It's possible the TPS is bad, the wiring is FUBAR, or it's adjusted wrong.

AFM won't solve your issue (the HKS suite are simply piggybacks and calculates a signal to send to the ECU that mimics the AFM signal)

 

[Insidious Surmiser]

think everyone's got it covered but TPS sounds like the culprit... if you can't get it to co-operate (need to adjust with volt-meter (see TSRM)) just try another one...