SC400 Hesitation

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stokdd

New Member
95 SC400, 126k miles.

Hesitation just after takeoff (at any decent pace) from stop...immediately after it starts to go the engine feels like it falls on its face - it's happened so bad a couple times I almost got hit by oncoming traffic (making a left turn). Also has a decent hesitation when applying light throttle while at speed.

I've SeaFoamed the **** out of the car, including gas tank/oil/vacuum line. I've replaced the spark plugs and wire with OEM straight from Lexus, as well as the fuel filter. I'ce cleaned the throttle body and cleaned the MAFs extremely thorough!

None of these 'mods' helped - in fact, the hesitation has gotten WORSE!

***********HERE'S the kicker - it DISAPPEARS when the MAFs is unplugged! Motor runs perfect! (except for not being able to idle with no MAFs)

PLEASE, if anyone has ANY clue, as to what might be causing this VERY annoying issue, SPEAKETH!
 
Sounds like you've already diagnosed it - can you swap the MAF with a mate's car to see if it runs better?

You shouldn't clean the MAF anyway as you can damage the optical sensor.
 
This sounds like the Air Flow Meter is done or at least damaged. Shocked that it is not kicking up a code. This engine has a Karmann Vortex volume air flow meter, not a MAF.

I am in Dallas & may have a spare to try if your a Sooner.
 


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