revtech101

1999 Trans Am AT w/120k miles. Mods are only a 104mm FTP lid.

All EGR codes turned off + EGR disable via HP tuners due to check engine light code:
P0405 - EGR Pintle Position Circuit Low Voltage.

EGR readiness - incomplete

All Else were complete.


EGR test enable and disable are both set to 256mph. EGR timing table has been Zeroed all across.

Nonethless, car passed a legit test only smog station with flying colors.

Here is what I found while I still had a complete unaltered OEM GM tune:

The 12v at the EGR valve reads ZERO when connected to the EGR valve. The 12v only appears when the EGR valve is unplugged. I tried to power a 12v light bulb with this source and it had no current to support even that. It simply goes to ZERO volts when trying to power anything.

I applied 12v to the EGR valve itself and it opens and closes like new.

http://easyautodiagnostics.com/gm_eg...gr_valve_1.php

My car hesitates at high load low rpms. Usually somewhere around ~1500rpm. I'm not sure when this started happening but I did notice the low mpg.

Anybody feel like helping me find out on whats going on? I am very literate when it comes to power and signal circuits

joecar

1996-2000 are allowed 2 not-ready monitors... so you passed.

revtech101

I understand the 2 incomplete readiness rule. I just didn't think it would pass the sniffer while on the roller test. I thought the EGR is as important as a good set of cats to pass on this test.

Attached #'s

joecar

The EGR lowers combustion chamber temperature which reduces NOx... your printout shows your NOx being a little high but still within the limits.

GLT1

hahhah owned mother flucker