ls-400-92 engine problems

[bloodwheel]

1992
Ls-400 v8
380000km

My beloved 400 dont work as i what!

When the engine is cold ,it works ok ,no problemo!
today i check the air intake sensor ,and also the igntion coils,nothing wrong there, they measure just fine...

I zeroed the codes(24,25,26) and took the car for a testdrive.

It worked perfectly when the engine was cold,but when it got to working temperture,it starded to hesitate,poor pickup.

and uneven idling



Have replaced the sparks,oil,filter,fuellines ,and filter last week!
The cats and oxygen sensors where replaced -09

I checked the error codes ,but non come up ???

help me please

 

[gloverman]

Try warming it up and unpluging the Air flow meter. If it runs better or the same with it unpluged then its most likely failed. Otherwise I suggest getting a scanner pluged in and looking at the live data. Cheers

 

[jayjay]

i had the same problem. It was bad plugs. Now my ECU is gone I believe. The code came up as Mass air flow but I am getting 5 volts with no resistance. So the flow chart says it is the ecu