Topper348
Probationary Member
- 27
- 0
- Mar 5, 2003
Hey guys,
Im having a really frustrating problem here. For some reason my car refuses to be tuned. I had the boost turned up to 20 PSI a few weeks ago and had no problems whatsoever. My O2 read .88
One of my coolant lines on the TB busted and when i put new hoses in it, i bypassed the TB. Not smart, i forgot about the fast idle air valve which made the car idle real high...about 2000RPM. I then broke it back down and returned the lines back to the TB.
After this happening, i logged it and found severe knock...20+ counts.
I now have the boost down to about 15PSI, but i cannot lean it out at all. I have been forced to rich the entire rpm band up to .96 volts....hell there are black clouds when i boost.
Unfortunately, I still have knock, so i drive very easy and i dont boost. No matter what I do on the AFC, lean or richen, I have knock....normally between 2500 RPM and 5000. The knock count stays around 20. My O2 is at .96. My fuel trims are around 98% to 100% low mid and high.
Having said that, I have an older AFC, the one with the knobs...its a challenge to fine tune, but it has always done the job OK. However, I cannot find support for it...only the blue screen AFC's. I played around with it today and my low fuel trim was at 88% so i leaned it out at idle until i got it to 100%. I dont think this matters, but i know your supposed to keep trims at 100%....or is that only the blue screened AFC's, for low throttle maps?
I have boost leak tested it and reset the base timing. Everything seems to be in check. I noticed on previous Logs when the car ran decent, i had 20-23 degrees of timing advance. I only have 10-12 now at WOT. My timing advance skips between 7-12 at idle. If someone can give me some advice it would be greatly appreciated! Also I have the logs saved and can send them. They were logged with TMO.
Thanks in advance for any help!
92 GSX: fresh 6-bolt, 2G MAS, stock IC setup, B16 ported, ported exh man., ported 2G O2 housing, ported intake man., ported head, walbro 190, old style AFC, denso 660's, 2G pistons, 3inch turbo back, and other mods not worth mentioning.
Im having a really frustrating problem here. For some reason my car refuses to be tuned. I had the boost turned up to 20 PSI a few weeks ago and had no problems whatsoever. My O2 read .88
One of my coolant lines on the TB busted and when i put new hoses in it, i bypassed the TB. Not smart, i forgot about the fast idle air valve which made the car idle real high...about 2000RPM. I then broke it back down and returned the lines back to the TB.
After this happening, i logged it and found severe knock...20+ counts.
I now have the boost down to about 15PSI, but i cannot lean it out at all. I have been forced to rich the entire rpm band up to .96 volts....hell there are black clouds when i boost.
Unfortunately, I still have knock, so i drive very easy and i dont boost. No matter what I do on the AFC, lean or richen, I have knock....normally between 2500 RPM and 5000. The knock count stays around 20. My O2 is at .96. My fuel trims are around 98% to 100% low mid and high.
Having said that, I have an older AFC, the one with the knobs...its a challenge to fine tune, but it has always done the job OK. However, I cannot find support for it...only the blue screen AFC's. I played around with it today and my low fuel trim was at 88% so i leaned it out at idle until i got it to 100%. I dont think this matters, but i know your supposed to keep trims at 100%....or is that only the blue screened AFC's, for low throttle maps?
I have boost leak tested it and reset the base timing. Everything seems to be in check. I noticed on previous Logs when the car ran decent, i had 20-23 degrees of timing advance. I only have 10-12 now at WOT. My timing advance skips between 7-12 at idle. If someone can give me some advice it would be greatly appreciated! Also I have the logs saved and can send them. They were logged with TMO.
Thanks in advance for any help!
92 GSX: fresh 6-bolt, 2G MAS, stock IC setup, B16 ported, ported exh man., ported 2G O2 housing, ported intake man., ported head, walbro 190, old style AFC, denso 660's, 2G pistons, 3inch turbo back, and other mods not worth mentioning.
