OK well its the usually scenario, I just bought a 240 and there are problems. I don't mind them however as I knew this car would be a project.
Anyway, here's the deal, whenever I rev the engine it revs up and then the rpms stay at whatever it was accelerated to for about 3 seconds and then they drop back down again. Sometimes they even climb 200 rpms or so and then stay there 3-4 secs, then drop down again. I've searched around and I have some suspicions, and I'm working on those, but I just wanted to hear what you guys have to say. I cleaned the throttle body so that's not it.
Problem 2, I replaced my thermostat and used high temp rtv to seal it with no gasket. And it leaks right at the connection where you put the thermostat in. I did this 3 times thinking that I just sucked at it, or did it wrong but I think that one of those times I should have gotten it right. Do I need the gasket that the Chilton's manual says I should have? I didn't take a gasket off when I removed it the first time.
And I have been using the search function.
The short version
Rpms stick for 3 seconds, and even climb 200
Thermostat leaks at the connection point - gasket necessary?
Problem 1 sounds like maybe a TPS issue what does your tps voltage read when this happens? Does voltage rise and fall normally? Problem 2 needs a gasket and clean the surface til you can eat off it, and make sure the housing isn't cracked.
I'll measure voltage and report back. What would you consider the normal rise and fall rate of voltage to be? Just a steady rate of rising when you hit the throttle and falling fast proportionately?
Ordered a gasket, should be here in 2 days (so says O'reilly), and I'll sand those surfaces with 400 or 1000 grit till they shine and check the housing first probably.
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