cold start stalling with codes

[RED95SHO]

On cold starts it will stall unless I feather the gas. After that it only idles low (500rpm) and stays running on warm starts. CEL lights intermitently with 335,124,336 and 337 codes in memory. How is the 124 fuel related and where do i start looking with the EGR system?

 

[projectSHO89]

124 is a TPS code. Likely a bad TPS or a faultu TPS connection.

For the multiple EGR codes, find out what works. Remove the vacuum line from the EGR valve and, using a short length of vacuum hose, give it the old "personal facial vacuum" test while idling. The engine should stumble or stall. If not, inspect/clean the EGR ports and repeat the test. If it still fails, replace the EGR valve. Once this test passes, reset the computer and rerun the KOER test. Given the codes you have posted, you most likely need a new DPFE sensor or have a faulty wiring harness connector.

A sticky IAC is the likely reason for the inability to idle when cold. Try cleaning it and see if that helps.

Steve

 

[RED95SHO]

cold stalls

Checked TPS voltage at 2.08v-10.52v idle to wot with a smooth increase in voltage. Certainly high readings. Is it a bad TPS or something else?
Checked vacuum line at EGR no stumbling or idle change. Will clean ports soon.
Cleaned IAC valve still cold stalls with low idle.
BTW it's an ATX.
Thanks for your help!

 

[93SHO'nOFF]

The TP sensor should be 0.7v-1.0v at closed throttle and no more than 4.5v at WOT.Are you sure you are measuring volts on the GY/R wire(sig rtn) and GY/W wire(TP)?The PCM BR/w (voltage reff) should never be higher than 4.5v.Check voltage at the DPFE sensor BR/w unpluged,if volts are higher than 4.5v the PCM is bad.This would explain your DPFE codes.The TP and DPFE sensor both get their VREF from the same circuit, (pin 36) on the PCM.
Later,
Mike

 

[RED95SHO]

Checked PTFE voltage

I checked the voltage on the DPFE connector unplugged and back probed the brn/gry wire with a reading of O.2v KOEO. When I checked the TPS, I back probed the center wire (gry/wht) with the grd on the rad support grd wires.
When I saw the high readings, I also checked the resistance with the TPS off the car and had 3.46 ohms at idle and 0.38 at wot. That seems very low. I read in one of the searches I did that it should be 180. Could the low resistance be causing the high voltage?

 

[93SHO'nOFF]

Check your PM box for chart's. .........Mike

 

[projectSHO89]

I would seriously consider testing your meter. Those readings are so far wrong.....

On the DC volts scale, measure battery voltage with the engine off. Should read 12.6V +/- 0.1 V.

Locate a known value resistor and test the OHMS function.

Steve

 

[RED95SHO]

Boy, do I feel dumb!

With the meter the way it was, the reading for battery voltage was 24v! I don't need to tell you what the reading was when I put a fresh battery in the meter. All is fine with the TPS, although I will tune it since I read 0.91v at idle. I've changed the DPFE sensor and I'm waiting for a new IAC valve. I apologize for waisting your time and sincerely thank you for all your help!