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V35 Warm Start Up Issue

Roachy94
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Roachy94 Contributor

Roachy94

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Alright I have an issue with my 300gt. 90% of the time when I start it after the engines already warm it will start to idle but will drop rapidly to the point where the car almost shuts off (sometimes it will actually shut off). During this the engine light or 'check at' light will come on for the duration up until the cars idling normally again. If the headlights are on at the time they'll fade down aswell like the car is losing too much power.

I have absolutely no clue what the issue is. Anybody experienced anything similar?

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scotty nm35 Grand Master

scotty nm35

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Posted

Is yours direct injection?

I would be removing the throttle body and cleaning the butterfly first. Be careful not to open/play with the butterfly, just clean it.

You will find the plenum is choked with carbon deposits from the EGR valve as exhaust gas is sucked into the plenum on cruise. If you have issues finding someone to remove the plenum and clean it give me a pm. Don't just squirt carby cleaner down the runners...

AlexanderWilde Collaborator

AlexanderWilde

Posted
Posted

yeap had the exact issue as described as well and it was the throttle body that was dirty and the butterfly was getting stuck.

note do not disconnect the cable connection to the throttle body as you will then need to do a relearn process on the ECU.

the MAF ( mas airflow sensor is ok to disconnect but I don't recommend turning the car over without it connected

Best thing to do :

Unscrew the air box and tubes and remove them

Disconnect the MAF but just leave it in its tube as you don't need to touch it

once you have the Throttle body easily accessible use the hex key to remove the 4 screws that hold it down ( make sure not to lose the gasket that sits between the throttle body and the motor


Keep the throttle body connected to its electronic cable (unless you want to do a relearn procedure)

put a cloth underneath the throttle body for any carby cleaner that drips off and with another clean cloth and carby cleaner spray and wipe the Throttle body on the inside and out (both sides of the butterfly and the butterfly itself (opening it manually and cleaning the edges)

once done. put it all back and reconnect the air pipes and MAF sensor (don't forget it or it will give you a CEL (check engine light)

and give it a key

some people like to spray a bit of carby cleaner in the air intakes to it cleans the inside of the pneum. I prefer to open it up and clean it properly but either way will do the job



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