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Discussion Starter · #1 ·
helping a neighbor with a stalling issue, after warming up it idles rough coming to a stop, or stalls, I saw a tps resistance test and looks good with throttle closed, air meter tests good, cleaned throttle body, im not sure how to identify activity with thermal air control under t-body, can someone help please....
 

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Gotta love these trucks!
2006 Sequoia SR5
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Only two sensors are directly affected by the temperature of the engine: the coolant temp sensor and the O2 sensor.

Check your temp sensor first. The one on top of the intake manifold with a single wire is for the dash gauge. The one on front of the manifold under the throttle body is the one the computer uses to control the fuel mixture along with the O2 sensor. It tells the computer when the engine is up to temp and then the computer tells the O2 sensor to go into closed loop and lean out the mixture. They are cheap to replace, but be careful not to force it out if it's corroded or you could strip the soft aluminum threads on the manifold. I did that and had to use a heli coil to fix it.

Second, check your O2 sensor. If it's bad it won't be going into closed loop and the truck will run too rich when it's warm. Not cheap to replace but not expensive either. If you don't know the last time it was changed you should probably change it.

Happy hunting!
 

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Discussion Starter · #5 ·
clean t-body seems to work better, im at idle 750 rpm spec, timed 5* btc, idle stable, but on acceleration im seeing some hesitation, at more aggressive attempts, im leaning toward the flow meter?
 
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