stock sohc wont idle, has a mind of its own, HELP!

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
purestock240
Posts: 106
Joined: Fri Mar 12, 2010 4:06 pm
Car: 240

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so i finally got my car in driveable shape, but when i start it up it will rev upto about 3k then drop to 1.2k then back upto 3k then back down etc. it will do this like 5-6 times then idle around 2500rpm. is it in safemode? sensor messed up? help


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OutToWinPAHC
Posts: 8810
Joined: Thu May 31, 2007 12:19 pm
Car: 2015 Chevy Silverado
Nissan Skyline R33 GTS-t
Nissan Skyline R32 GTR
Nissan RB20 E46 RHD
2015 Harley Vrod Muscle
1990 Nissan Patrol
Location: PA
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Coolant temp sensor can cause the ramp up but it will stay up. Could be an injector issue or maf issue. Does it have a CEL?

purestock240
Posts: 106
Joined: Fri Mar 12, 2010 4:06 pm
Car: 240

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CEL?

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breadbox
Posts: 8549
Joined: Tue Oct 17, 2006 4:09 pm
Car: 89 Nissan 240SX
89 Koop
84 720 4x4KC
Location: Va Bch

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Check Engine Light

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cheezy240
Posts: 417
Joined: Fri Sep 25, 2009 3:45 am
Car: 1990 RB20 Hatch
Location: Dirty-Mo, NC

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Yea bro check injectors and spray some MAF cleaner on your MAF. I had to go through hell and back to get mine running.
If that doesnt work then chec plugs and mess with your idle s*** on the side on the intake manifold.


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