[littlemouse]

After I clean the throttle body and MAF on my 92 LS400, the RPM start a little higher then 1000 and idle roughly. After 30 second, RPM start decrease (I can feel the car is shaking) then engine die. start it again and it die within 10 secounds. I wait for two hours and try again same thing happen (RPM start a little higher then 1000 and idle roughly. After 30 second, RPM start decrease then engine die.)
I unplug the MAF sensor nothing change.
I use CRC mass air flow sensor cleaner and CRC Throttle body & air-intake cleaner

Any one know why?

 

[hevster1]

How did you clean it? Did you just spray into it with the car off and then try to start?

 

[littlemouse]

How did you clean it? Did you just spray into it with the car off and then try to start?

I clean it like this with spraying cleaner and scraping it
I do it with the car off and start after eveything put it back.

 

[hevster1]

so you flooded the intake with cleaner. I suggest you pull the plugs and crank the motor for a minute to clear the cylinders. Clean the plugs and reinstall. it should fire right up.

 

[littlemouse]

I end up change the electronic unit (MAF, AFM) only and it's all good now....

I bought two MAF..... just in case...
Now I need to sell one....
I pay $100 + for it and now selling for $90 shipped
PM me if anyone is interesting on it