3000GT/Stealth International Message Center - View Single Post - Lean Misfires at 2700-2800 rpm

mehlosTT · 10-09-2006, 06:24 PM

Just how lean or rich are those O2's when you think it's spark blow out? What are the AFRs exactly?
The 'bouncing timing you see, are you positive it is not just the ecu pulling timing when knock is coming on?
And what the heck is "TurboBob ecu"?
One of the first symptoms of an ECU (Mitsu uses) going south is the fueling...for what ever reason, a crappy ecu will often start to have problems controlling the fueling..then too lean..knock or like a bad O2 sensor run with leaded fuel, it starts to read rich so the ECU starts to lean her out terribly.
Best bet_ find a stock 1st gen ECU and try that.

10-09-2006, 06:24 PM	#26 (permalink)
mehlosTT 220K club Join Date: Oct 2003 Location: Twin Cities_MN, USA Drives: AWD or nothing. Trader Rating: (8)	Re: Lean Misfires at 2700-2800 rpm Just how lean or rich are those O2's when you think it's spark blow out? What are the AFRs exactly? The 'bouncing timing you see, are you positive it is not just the ecu pulling timing when knock is coming on? And what the heck is "TurboBob ecu"? One of the first symptoms of an ECU (Mitsu uses) going south is the fueling...for what ever reason, a crappy ecu will often start to have problems controlling the fueling..then too lean..knock or like a bad O2 sensor run with leaded fuel, it starts to read rich so the ECU starts to lean her out terribly. Best bet_ find a stock 1st gen ECU and try that. __________________ '92 R/T TT 236 K mileage club AEM EMS, Twin TD-O5 MHI EVO 16G, Electronics: AEM ems, FJO dual WBO2, GaugeTech AEM ems display, custom made EL type main gauge faces, [/size]