bouncing RPM's
02-04-02, 05:26 PM
#1
Full Member
Thread Starter
Join Date: Jan 2002
Location: San Diego, ca
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
bouncing RPM's
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
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
02-04-02, 05:31 PM
#2
Formula Mazda Driver
Join Date: Feb 2001
Location: Portland, Oregon, USA
Posts: 680
Likes: 0
Received 0 Likes
on
0 Posts
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.
02-04-02, 05:35 PM
#3
Full Member
Thread Starter
Join Date: Jan 2002
Location: San Diego, ca
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
02-04-02, 05:41 PM
#6
W. TX chirpin Monkey
Join Date: Sep 2001
Location: Mesquite, TX
Posts: 2,684
Likes: 0
Received 0 Likes
on
0 Posts
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.
Trending Topics
02-04-02, 06:42 PM
#8
I came, I saw, I boosted.
Join Date: Apr 2001
Location: Windsor, Ontario, Canada
Posts: 1,921
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
Thread
Thread Starter
Forum
Replies
Last Post
LongDuck
1st Generation Specific (1979-1985)
12
10-07-15 08:12 PM
eplusz
General Rotary Tech Support
15
10-07-15 04:04 PM
