Hugh 240z

I was thinking about the thermostat as well.... I don't have any idea whats in there. It only takes a couple minutes to warm up, so I figure its not missing... but I should think about changing it out.

Where you at in SD? Way down south or something? My car runs fine usually, so I don't have a problem driving it somewhere... I will try the oil stuff first. Thank you guys for trying to help!

Oh, I'm in Oceanside, let me go fix my location now...

Thanks for the welcome. I've been surfing around trying to find some people who understand the SU setup for help.:stupid: I don't think the clutch is locked, because I don't hear the fan all the time like as if it were locked up. The fuel filter could seriously need changing... I will give that a shot. The air filter housing is some sort of aftermarket piece. It doesn't have the orange duct thing on it... its just an oval filter with a top cover that holds it on with a wing nut hanging on the side. It also has an aftermarket header on it, so I don't think there's anything that routes exhaust heat back to the intake. My problem is I don't want to invest any money into repairing this engine, since it will be coming out in the next few months. So the cheapo fix sounds good to me... I'll see what I can come up with.

Thanks a lot, I'm reading there now.

Well, cold air is more dense, making more power... requiring more fuel... but I don't know anything about carburetors, so I don't know if they compensate for temperature changes like EFI or not?

First off, a disclaimer: I am an EFI guy, so these carbs blow my mind. I've got a 240z with an L28 and the SU carbs. This motor is on its last legs... but still runs pretty strong. It burns a lot of oil, however. I am going hybrid with this car eventually, but I need it to get around until that time. It seriously runs nice and strong everyday, but I've noticed a problem late at night when its really cold out (southern california, not snow mind you) I'll be cruising in high gear on the freeway and it just cuts out. It does it mostly when I apply the throttle under heavy load, like high gear uphill, or when passing cars. If I try to throw a lot of throttle at it quickly, its even worse. Sometimes when just going uphill without trying to accelerate, it cuts out then, too. When it cuts, it pops and I can hear like a backfire out the carbs or something. It just sounds like the pressure is blowing out the intake. This only happens when its really cold... and I can see my water temp is low (like less than 150 degrees) while cruising on the freeway between 50-75mph. At high RPM, low gears, low load, etc... its running great, regardless of the temp outside.