SlowGrandNational
New Member
- Joined
- Mar 29, 2015
Just looking for some opinions. Hopefully I am on the right track.
Have been chasing an issue that I originally thought was tied to my factory MAF finally dying. Got a used translator from my dad and bought a AF10043 MAF which seems to be an 85mm so I set the translator to that. Picked up a new Bosch narrowband 02 and put a standalone(no logger) Autometer wideband in just to monitor values a little easier.
Starts up, idles fine in the driveway, drives good at little throttle for the first 10 min around 13.5-14.5 AFR, 128 BLM seems okay considering no boost or load really. Trouble comes once the car really warms up after around 10-15min. Reset ECU by disconnecting battery and do some 3rd gear pulls for info to set TT chip with scanmaster G as translator instructions suggested, 16-17psi and I am seeing 2-5° retard 14.1AFR, good fuel pressure.
Ease off and notice AFR jumps to 10:1 (gauge rich max reading, likely much richer as car stumbles) whiles going back to just cruising home at roughly 1100-1600RPM
INT 160
BLM 142
TPS .97
CLT 167°
The only time AFR comes back to a normal range of 12.5 - 13:1 is when I take my foot all the way off the gas. Shut the car off and let it cool down, start it back up and it idles good again.
Other info: 42lb injectors fuel pressure hood gauge shows pressure rising good with boost, but it does bleed off immediately after fuel pressure is primed, but I feel that is unrelated. Replaced narrowband 02 again. Double checked MAF setting, I do see it going to 255 on WOT. I cannot get chip to go into closed loop learn after ECU reset, I'm not sure what I am doing wrong there. Checked for vacuum leaks, there seems to be none. New R43TS plugs at the same time as MAF translator install.
What I did end up finding was multiple pin holes in the cross over pipe. 3 that I can see on the bottom of the pipe, they're little larger than 1/16th; I was able to confirm they're actual holes by sliding a 1/16th drill through them.
I am going to pull the pipe off and have it repaired as a short term fix, but could a few very small exhaust leaks like this really be causing these issues? I understand unmetered fresh air on the narrowband is making the car believe it is lean and adding fuel, but for it to go so rich that I see black smoke and smell unburnt fuel feels like there would be more going on. Sick today so I'm sitting inside second guessing myself thinking it could be something so simple. Hopefully car will be getting headers built soon so I am just wanting to repair and hopefully eliminate this rich issue.
Have been chasing an issue that I originally thought was tied to my factory MAF finally dying. Got a used translator from my dad and bought a AF10043 MAF which seems to be an 85mm so I set the translator to that. Picked up a new Bosch narrowband 02 and put a standalone(no logger) Autometer wideband in just to monitor values a little easier.
Starts up, idles fine in the driveway, drives good at little throttle for the first 10 min around 13.5-14.5 AFR, 128 BLM seems okay considering no boost or load really. Trouble comes once the car really warms up after around 10-15min. Reset ECU by disconnecting battery and do some 3rd gear pulls for info to set TT chip with scanmaster G as translator instructions suggested, 16-17psi and I am seeing 2-5° retard 14.1AFR, good fuel pressure.
Ease off and notice AFR jumps to 10:1 (gauge rich max reading, likely much richer as car stumbles) whiles going back to just cruising home at roughly 1100-1600RPM
INT 160
BLM 142
TPS .97
CLT 167°
The only time AFR comes back to a normal range of 12.5 - 13:1 is when I take my foot all the way off the gas. Shut the car off and let it cool down, start it back up and it idles good again.
Other info: 42lb injectors fuel pressure hood gauge shows pressure rising good with boost, but it does bleed off immediately after fuel pressure is primed, but I feel that is unrelated. Replaced narrowband 02 again. Double checked MAF setting, I do see it going to 255 on WOT. I cannot get chip to go into closed loop learn after ECU reset, I'm not sure what I am doing wrong there. Checked for vacuum leaks, there seems to be none. New R43TS plugs at the same time as MAF translator install.
What I did end up finding was multiple pin holes in the cross over pipe. 3 that I can see on the bottom of the pipe, they're little larger than 1/16th; I was able to confirm they're actual holes by sliding a 1/16th drill through them.
I am going to pull the pipe off and have it repaired as a short term fix, but could a few very small exhaust leaks like this really be causing these issues? I understand unmetered fresh air on the narrowband is making the car believe it is lean and adding fuel, but for it to go so rich that I see black smoke and smell unburnt fuel feels like there would be more going on. Sick today so I'm sitting inside second guessing myself thinking it could be something so simple. Hopefully car will be getting headers built soon so I am just wanting to repair and hopefully eliminate this rich issue.