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What could cause my car to lean out while crusin

Wilford Brimley said:
It's at the collector, you think so?
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Possibly. I can tell you that I built a tuned exhaust system for the race car and at idle and very low load/engine speeds, the A/F meter is off the charts lean. "---" on the gauge lean. At full chat it was good, like 13.2 or so. We attributed it to one of a few things: the possibility that there was a tuning effect taking place where it may have been pulling in just a hair of outside air and diluting the limited amount of exhaust it was producing, or the wideband sensor was "drafting" the O2 sensor (they're not lined up, but they're close together and not too far off), or maybe the gauge and sensor are less accurate than you would like and only should be used as a guideline and not as hard facts.
 
Wilford Brimley said:
Yeah it does just spectre or whatever the f autozone sells
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You could try spraying the hot wire with MAF cleaner and see if it helps. The MAF screens can be temporarily removed for better access, but be careful not to touch the hot wire itself - it looks way too delicate.

LH2-4-Hot-Wire-MAF.png
 
bobxyz said:
You could try spraying the hot wire with MAF cleaner and see if it helps. The MAF screens can be temporarily removed for better access, but be careful not to touch the hot wire itself - it looks way too delicate.

LH2-4-Hot-Wire-MAF.png
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That's my other move. I'm gonna fix the exhaust leak today and get some crc cleaner for the maf
 
Where's your MAF located - before the turbo, or between the intercooler and throttle body? It's the oil from the air filter that can cause problems.
 

240 - 91 240 lean drivability issues. Stranded in CT

My car is having a problem where it reacts way too slow to changes in throttle. Started happening suddenly early this morning, first start of the day. For example: Accelerating from a stop, wideband reads full lean & misfires then the lambda slowly returns itself to 1.0 and the drive ability...
turbobricks.com turbobricks.com

When I was 5.5 years younger and dumber. I think I ruined a handful more MAFs before I realized the blow-thru setup was the problem.
 
esmth said:

240 - 91 240 lean drivability issues. Stranded in CT

My car is having a problem where it reacts way too slow to changes in throttle. Started happening suddenly early this morning, first start of the day. For example: Accelerating from a stop, wideband reads full lean & misfires then the lambda slowly returns itself to 1.0 and the drive ability...
turbobricks.com turbobricks.com

When I was 5.5 years younger and dumber. I think I ruined a handful more MAFs before I realized the blow-thru setup was the problem.
Click to expand...
It has been there for like 3 or maybe even close to 4 years🤣 if they last that long then I'm game.
 
It doesn't react like that at all....it spools quick and takes off like hell, idles great, under full tilt it's at 10.4-10.6 when I'm giving it the beans, just at cruise and light throttle at high and mid rpms it fucks up, weird shit....all I'm saying is what mine is doing is very different then your post. I'm fixing the exhaust leaks and reinstall this evening, see if that helps or not.
 
esmth said:

240 - 91 240 lean drivability issues. Stranded in CT

My car is having a problem where it reacts way too slow to changes in throttle. Started happening suddenly early this morning, first start of the day. For example: Accelerating from a stop, wideband reads full lean & misfires then the lambda slowly returns itself to 1.0 and the drive ability...
turbobricks.com turbobricks.com

When I was 5.5 years younger and dumber. I think I ruined a handful more MAFs before I realized the blow-thru setup was the problem.
Click to expand...
I have to admit I've never ruined one with the blow through, which I've done on multiple 7s I've owned
 
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