Any ideas on what is making this car go lean?
#28
He's got so som sort of issue with the MS or wiering look at 82 and 95 seconds in the log. Se the way the coolant sensor goes up in the same instance the map and tps goes down, also the indicated battery voltage goes down. At 128 he reduses throttle, map behaves normally, but colant and volt behaves odd. Grounding issue?
Tommy
Tommy
#29
Hustler's not wondering about those instances. A sudden CLT jump related to closing the throttle and changing alternator voltage is an understood phenomena. What he's wondering about is the slow, cyclical change in CLT throughout the log . . . looks like a sine wave.
Honestly, it looks like the sensor is good but the CLT control is lousy. It seems to rise and fall in a delayed, smoothed response to engine load. I also don't see that AFR has a relationship to CLT in these curves.
Is the cooling configuration stock (no reroute)? Older T'stat? Don't forget that in this configuration, CLT is sensed at the back of the head by cylinder #4 while the T-stat is trying to control (and cool water is being ingested by the mixing manifold) at the front. Also, sometimes the little bleed line from the T'stat housing gets clogged leading to delayed control.
If rerouted, is the T'stat in the head or remote? A remote T'stat (M-tuned) could exhibit poor control in certain circumstances.
Honestly, it looks like the sensor is good but the CLT control is lousy. It seems to rise and fall in a delayed, smoothed response to engine load. I also don't see that AFR has a relationship to CLT in these curves.
Is the cooling configuration stock (no reroute)? Older T'stat? Don't forget that in this configuration, CLT is sensed at the back of the head by cylinder #4 while the T-stat is trying to control (and cool water is being ingested by the mixing manifold) at the front. Also, sometimes the little bleed line from the T'stat housing gets clogged leading to delayed control.
If rerouted, is the T'stat in the head or remote? A remote T'stat (M-tuned) could exhibit poor control in certain circumstances.
Last edited by hornetball; 04-12-2013 at 12:03 PM.
#30
first graph has throttle position at 1% when you go lean.
how does it feel to drive, what's happening through the pedal?
i'd +1 to whoever said grounding btw.
#31
"how does it feel to drive, what's happening through the pedal?"
When driving until warm it drives normally. When warm is alternates between normal behavior and falling on its face. Basically I am driving along it stops pulling. The AFR gauge heads toward 18 - 22. Moving the gas pedal has no effect. If I back off it will recover and pull again. The last time I drove the car it was doing this relatively often.
When driving until warm it drives normally. When warm is alternates between normal behavior and falling on its face. Basically I am driving along it stops pulling. The AFR gauge heads toward 18 - 22. Moving the gas pedal has no effect. If I back off it will recover and pull again. The last time I drove the car it was doing this relatively often.
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