Please help me,

My Mazda RX7 model year 1983 vibes between 2500-2700rpm, with any gear on and also when car stay still and accelerate to 2500-2700rpm.
Only on this 200rpm area else it is normal.
I change spark plugs it do not help old ones were good condition also cabels.

Have anyone idea what is wrong in my engine?

 

like I said before in a previous post ..and it happens ..trust me you have the trailing wires either wrong or the wires are not "Snapped' on to the plugs..

 

Make sure that your exhaust system is not resting directly against the chassis (frame, underbody, etc.). Any direct contact like that will produce the vibrations that you are describing.

 

I'm still having a similar problem. The flex pipe in my exhaust is a little worn (small leak) but there's no frame banging problems. My dizzy is FUBAR, needs a cap and rotor bad (plugs, points, wires and condensors were already replaced) I do get a little bit of a wiggle in the position of the gear shift lever when under power and under engine braking. Is that typical for our vehicles? There is no serious vibration in the engine compartment other than the typical (???) rotational leer when racing the engine.

... Transmission mount? Trailing Ignition?
SA22C

 

Cap/rotor will play a big part in your issue snwyvern. Tranny mounts are also prone to early expiration, which will cause vibrations felt in the shifter.

 

O K, I use to be a dealer tech, seens this many time and with out going under the car would tell then they needed a trany mount, sooner or later they bottum out,

 

Sounds like trans mount. How hard is the replacement?

B

 

I've found this is usually the mount on the crossmember under gearbox. Replace it and amazing difference results :P Check out the rubber mount.

this is what my old stuffed mount looks like


this is what new one is like:
http://rx7.pw.cx/photos/AREAS/transm...rthy%20024.jpg (click)

Before I replaced this, the entire chassis was vibrating as I drove, especially around 2700rpm ~ after replacing it and checking exhaust mounts, smooth and no vibration

 

Thank You All, for your help as Kentetsu, bliffle and H4Inf says problem was exhaust pipe bracket which is placed rear end of transmission case and transmission mount itself.
Here in Europe there was no mount and it takes 2 weeks to get new from Japan, Mazda importor says there was 1pc available in Japan and price is 36€ ~ 40$.
I come back after I have changed a new one.

 

That's not bad delivery time for Finland. Decent price, too. I can get the mount for about $26 here, but then with shipping it'll be a lot more. And it takes about a month for surface transport to Europe. I think there are a lot of parts and RX-7s in Britain.

B