I have an '88 RX-7 SE
when ever i try to hold it at 1500, 2000, or 2500 RPMs it will drop about 200-300 RPMs then go back up and drop again. it will keep bouncing until I let off the gas or give it more gas. it doesnt happen when im accelerating, only when i try to hold it.

ive tried changing the spark plugs, air filter, and O2 sensor and it still happens.


PLEASE HELP ME

 

Sounds like an intake leak. check all of your vaccuum lines for cracks, etc....if they are hard then they probably are not sealing well and need to be replaced. Could also be an intake gasket. Try spraying carb cleaner around where your manifold meets up and see if this raises your idle. If so you need to take off your manifolds and replace at least one gasket.

 

i did the carb trick and nothing happened

i tried to have my auto shop teacher look at it and he said its could be cause it is running rich, but doesn't know about anything rotary engines.

 

It could be a throttle position sensor or a vacuum leak. I have the same problem. I am convinced its my old paper intake manifold gasket blown out.

 

does it happen to you at the same RPMs?

 

My last TII did that and I got a better ground and cured the problem. I used a hole above the #2 (rear) Trailing spark plug and ran a 10 gauge wire to the (-) side of the battery. Bottom line a big fat ground from block to chassis. It starts better too. Couldn't hurt. Oh yeah for a better set up. solder everything, minimize the amount of crimps you use.

 

ill try that. is there any danger in doing it?

 

Three little letters... T.P.S.!
ALso- there is a fuel-cut linkage/diaphragm on the front of the TB- you'll know which one it is because if you push it the engine will rev EXACTLY how you said... check it, it way be jammed or something.
but that is usually a (very) misadjusted TPS.
Reset the ECU (unhook battery for 10 min) and adjust the TPS (WHILE WARM!!) to spec.

 

what does tb and tps stand for and where are they.
does anyone have any pics of these things

thanks

 

tb-throttle body
tps-throttle position sensor

 

what do they look like

 

ok i found the TPS, but how do i adjust it/fix it

 

i checked the tps with the volt meter and it looked ok i still havent tried the lights test


PLEASE HELPPPPP!!!