Z does not accelerate

juld0zer · 10-12-2014, 07:08 AM

Pedro & Carlitos, how are your cars these days? I finally cleaned my throttle bodies today. Took about 3hrs but i disconnected both and also operated the butterfly valves manually to ensure i removed as much carbon and gunk as i could. I already have the coolant hoses removed from both sides so that saved a lot of time and mess. I'm currently waiting for engine to cool down to perform the relearn procedure trifecta (first two must be done with coolant below 25c). Car felt no different after driving with the cleaned throttle bodies but the idle did hunt between 800-1200rpm - which is to be expected since i did disconnect both bodies and removed them from the engine bay for cleaning.

There wasnt a huge amount of gunk but most of it did require some rubbing several times with a cloth soaked in carby cleaner.

When i sprayed both throats, i noticed one held the fluid in a pool on the butterfly while the other dribbled out the other side fairly quickly. My first thought was that the one that doesnt leak is the least likely to be causing problems - sort of like if the throttle valve is at rest, it should be completely shut. After cleaning both thoroughly, i gave both a final blast down their throats and realised now BOTH dribbled freely out the other end!! So the carbon build up must've been so severe that it formed a seal between the butterfly and the wall of the throat, impairing the full range of the butterfly.

Both throttle bodies seemed to have a loose rattly sound when tapped on the black cover...

What is the mileage on your cars when this issue started?

I'll see how the relearns go in about 2hrs time.
Prior to cleaning throttle bodies, my idle kept sagging to 500rpm at the lights also.

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10-12-2014, 07:08 AM	#10 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	Pedro & Carlitos, how are your cars these days? I finally cleaned my throttle bodies today. Took about 3hrs but i disconnected both and also operated the butterfly valves manually to ensure i removed as much carbon and gunk as i could. I already have the coolant hoses removed from both sides so that saved a lot of time and mess. I'm currently waiting for engine to cool down to perform the relearn procedure trifecta (first two must be done with coolant below 25c). Car felt no different after driving with the cleaned throttle bodies but the idle did hunt between 800-1200rpm - which is to be expected since i did disconnect both bodies and removed them from the engine bay for cleaning. There wasnt a huge amount of gunk but most of it did require some rubbing several times with a cloth soaked in carby cleaner. When i sprayed both throats, i noticed one held the fluid in a pool on the butterfly while the other dribbled out the other side fairly quickly. My first thought was that the one that doesnt leak is the least likely to be causing problems - sort of like if the throttle valve is at rest, it should be completely shut. After cleaning both thoroughly, i gave both a final blast down their throats and realised now BOTH dribbled freely out the other end!! So the carbon build up must've been so severe that it formed a seal between the butterfly and the wall of the throat, impairing the full range of the butterfly. Both throttle bodies seemed to have a loose rattly sound when tapped on the black cover... What is the mileage on your cars when this issue started? I'll see how the relearns go in about 2hrs time. Prior to cleaning throttle bodies, my idle kept sagging to 500rpm at the lights also.