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The Terminator
Engine/Tuning
AFRs are erratic and drifting rich
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<blockquote data-quote="silver_cobra_01" data-source="post: 16519150" data-attributes="member: 172972"><p>The car was in storage for a while and finally took it out a few months ago only to find out it wanted to idle at 11.5-12 AFR. Nothing had changed since I first tuned it so very strange. Thought that one or more of my Siemens Deka 80S was stuck open or partially open so sent them out to be cleaned. Reported back with "cleaned multiple times due to erratic performance" but ended up being within 5% of each other so I ran them. Same issue. Idle and cruise around 11.5-12. Thought maybe the wideband was bad so replaced it. No change. Figured that the 80s were still "performing erratically" so I bought FIC1000s, adjusted the tune, and same thing. </p><p></p><p>The most notable oddities of what's going on is that the car will crank, start, and be extremely lean, 19 or so, for the first minute or two of startup then slowly work its way down to 14.5 or so. Then, let the car sit for an hour or so, and again startup was lean, but now around 16-17 and after a minute or two worked down to 13 or so afr.</p><p></p><p>Recently replaced all COPs with FRPP, plugs with TR6s, and both front O2 sensors</p><p></p><p>I'm now thinking the ECU might be bad but I'm open to any ideas, suggestions, or opinions anyone else may have. Thank you for your help guys.</p></blockquote><p></p>
[QUOTE="silver_cobra_01, post: 16519150, member: 172972"] The car was in storage for a while and finally took it out a few months ago only to find out it wanted to idle at 11.5-12 AFR. Nothing had changed since I first tuned it so very strange. Thought that one or more of my Siemens Deka 80S was stuck open or partially open so sent them out to be cleaned. Reported back with "cleaned multiple times due to erratic performance" but ended up being within 5% of each other so I ran them. Same issue. Idle and cruise around 11.5-12. Thought maybe the wideband was bad so replaced it. No change. Figured that the 80s were still "performing erratically" so I bought FIC1000s, adjusted the tune, and same thing. The most notable oddities of what's going on is that the car will crank, start, and be extremely lean, 19 or so, for the first minute or two of startup then slowly work its way down to 14.5 or so. Then, let the car sit for an hour or so, and again startup was lean, but now around 16-17 and after a minute or two worked down to 13 or so afr. Recently replaced all COPs with FRPP, plugs with TR6s, and both front O2 sensors I'm now thinking the ECU might be bad but I'm open to any ideas, suggestions, or opinions anyone else may have. Thank you for your help guys. [/QUOTE]
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Engine/Tuning
AFRs are erratic and drifting rich
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