1991 240sx KA24DE Slow revs when warm.

[grahmh]

So when i first start it up in the morning it runs great revs fast and has power. Then when it warms up I lose power and revs really slow. I mean its so slow minivans that are barely on the gas are passing me when i am floored. IT IS SLOW.

What do you think could be going on?

Thanks

[kouki munster]

Sounds like it could be the coolant temp sensor, do a search for the fsm as it will tell you how to go about checking it.

[grahmh]

Where is the sensor located?

[OutToWinPAHC]

Here's a write up from the ultimate sticky zerothread?id=254375

[NISSAN240SX12]

it could be the temp sensor or the fuel pump. i had the exact problem it ended up being the fuel pump was jacked up.

[grahmh]

Awesome guys thanks. I will look at the sensor tomorrow. I will report back.

[Armstec_S13]

Let us know, I have the same problem, except my car is an 89 SOHC I did have a prob once with my temp sensor, cleaned the connector and it worked fine, now I have noticed that same problem with my car, if ya find out let me know.