Better throttle response when cold?

[WhippinCamry]

91 camry dx.

maintence is all up.

heres the problem.

when the engines cold.
its decently quick. good throttle response. engine sounds alive.

once the engine temp goes up a little ways. it "jumps" quickly. and the temp continues to go up. after this "jump" the good throttle response goes and the engine sounds a little more boggy.

i do have a bad rear motor mount so that could be the jumping.

car has never overheated.

is this just normal?

[dem2757]

your transmission fluid expands when hot. its probably too full.

[WhippinCamry]

i drained it cause thats what i thought. refilled. its at the perfect level. when its hot. its a little ways below the full hot mark.
it might of been you who told me it has to be exact. its pretty close to the middle of the two marks.

[WhippinCamry]

just thought it might be coolant sensor or thermostat or something weird?

[WhippinCamry]

ahhhhh i see. i read on this chevy forum. "There is a coolant temp correction in the timing table that allows much more timing on a cold engine to prevent back firing. Your hot engine will not accept that much increase in timing without pinging. When the timing correction decreases, so does the performance."

[holmesnmanny]

That's probably referring to the thermo/ported vacuum switch. It retards and/or advances timing based on the coolant temperature.

[Jimnist]

Sounds like you're running rich. Maybe the coolant temp sensor has gone kaput and is keeping the cold start injector permanently on?

[WhippinCamry]

plugs are nice and tan. lol. car was ran on 3 cylinders by my gf for a while, she didnt know. as most people dont until the car wont start. being a yota it probably would of kept running regardless.

the valve seats or something in that cylinder might be worn or something.

compression test shows 200 psi on all cylinders though.