3800 Regal owners

[troy1]

I never have understood how they can claim it removes carbon buildup. You gotta wire wheel that crap off most of the time. 3 - 4 + mpg for me hopefully it stays that way!!

Troy

[BNaylor]

Originally Posted by troy1

I never have understood how they can claim it removes carbon buildup. You gotta wire wheel that crap off most of the time. 3 - 4 + mpg for me hopefully it stays that way!!

Troy

Yeah thats a good point Troy. I can see the soft carbon. Plus the carbon has to go somewhere? Out the exhaust via the CAT? I'll let you know how that BG 44K works for me.

[troy1]

Ok, today I got a DTC PO134 O2 sensor 1, bank 1 no activity. Anyone got the dianostic tree for the DTC or just a bad O2


Key on Engine off test:
Pink & black wires 11.93volts
Purple & Tan wires .38 volts

[BNaylor]

Originally Posted by troy1

Ok, today I got a DTC PO134 O2 sensor 1, bank 1 no activity. Anyone got the dianostic tree for the DTC or just a bad O2


Key on Engine off test:
Pink & black wires 11.93volts
Purple & Tan wires .38 volts

I'll check the GP Serv. Manual but so far basic description says 02 sensor or 02 sensor circuit (before CAT) has developed an open.

[troy1]

Gee I wonder if this what was causing my crappy MPG Crappy Borg O2 sensor from the get go?

[BNaylor]

Originally Posted by troy1

Ok, today I got a DTC PO134 O2 sensor 1, bank 1 no activity. Anyone got the dianostic tree for the DTC or just a bad O2


Key on Engine off test:
Pink & black wires 11.93volts
Purple & Tan wires .38 volts

The pink is 02 sensor heater which should read around 12v. Black is ground. The purple wire is 02 sensor activity going back to the PCM. Voltage will vary from 1.0 v (rich) to .1 v (lean). The tan should be the PCM reference signal which is around .45 v. coming from the PCM. I recall the purple is where you tap into for 02 sensor activity for Autometer type scanner gauges. I'd bank on the Borg 02 sensor and replace it with an AC Delco AFS 109. Good luck!

[troy1]

Put it on the snapon scanner and said low activity. The guy I talked to thinks the upper intake has a vaccum leak and it just leaned it out to much.

[BNaylor]

Originally Posted by troy1

Put it on the snapon scanner and said low activity. The guy I talked to thinks the upper intake has a vaccum leak and it just leaned it out to much.

It looks like you have a good grasp of the situation. Hopefully, the UIM/LIM job takes care of it. If not the 02 sensor. Only problem I found is they are not too readiliy available on EBay like the rear 02 sensor and not cheap through the dealer or AC Delco authorized parts stores. Ed Morad who lists on Ebay has a few front 02 sensors for cheap but used. Good luck!

[troy1]

Well did the UIM gaskets this morning started at 9 done by 12:15. I did find some antifreeze back by the 4 & 6 injectors not a lot but some. Most likely it was from when I took the bolt out to get the EGR sheild off. It didnt look like the old gasket was sealing well. Might swap out the MAF with a known good one.