DUSTER

i have an 88 rx-7
there is a power loss from 3500rpm to 5500rpm
all ive hade dun to it is cut the catilitic coverter off
it has dun this even befoe this pleas help!!!!!!!!

WAYNE88N/A

1) secondary injectors (check plugs, wiring, and maybe get 'em cleaned)
2) you removed the cat, but did it disintegrate and clog anything behind it?
3) check auxiliary ports operation
4) check fuel filters
5) engine/ECU grounds, top of rear rotor housing
6) check intake air filter for cleanliness

DUSTER

auxiliary ports operation???
anyway i have new fuel filters
air filter is clean and i just put new plugs and wires on it
but ill check the ecu grounds
ill come back tomaro if i still have problems thinks

DUSTER

hay i do need to find out wut the
auxiliary ports operation is thinks

WAYNE88N/A

the 5th/6th port actuators, on the right side of the engine, just above the exhaust manifold...dab some grease on the rods, take her out for a spin and run her hard, then check the rods- if they haven't moved (the grease is as you placed it), then the ports are stuck closed, or the air source to the actuators (from exhaust backpressure) is insufficient

DUSTER

you mean the split air pipe
my pipe has ben cut and closed
not by me but however owned it befor
could that cas it to hapen?

bigdv519

iTrader: (3)

You should also do a compression test. Anything under 90psi is probable cause for any power loss. IM at 82psi and still going though.

DUSTER

ive had a comp test at a deler they didnt tell me wut
it was but they did say it was good!

bigdv519

iTrader: (3)

Do one yourself, thats the only way to be sure.

DUSTER

thinks but i still need to know about the split air pipe

bigdv519

iTrader: (3)

Is that the exhaust from the air pump pipe??? The one that dilutes the toxic rotory engine exhaust???

DUSTER

i dont know. all i know is that its cald the split air pipe
and it gos from the cat back to the engine

WAYNE88N/A

yes, that split air pipe is the source for the aux port actuators on a S4...find the small "vacuum" hose that runs from the (if it's there) split air pipe in the lower aft right of the engine compartment, it should be going to a metal line just aft of the rear port actuator...pull it off of the split air pipe "nipple", and connect a 2-3 psi air source to it- the actuators should move (rods will retract into the actuator body)...if they do move, then good, all you have to do now is find an air source to actuate the ports, most guys use the ACV valve or air pump hose for the source...there are LOTS of threads on this subject, do a search...

DUSTER

thanks man you dont know how much you are
helping me

ill come back tomaro to tell you how it went

may 13

DUSTER

o and i dont know what you mean about "on an S4"
mine is an SE is there any diferince?

ViperKillerWannabe

S4 = Series Four = 1986-1988
S5 = Series Five = 1989-1991

DUSTER

well i looked at the actuators both of them move.
and i have not done anything to the split air pipe.
should i do something anyway?
or could it be something els?

DUSTER

i did a comp test. the front is at 125 and the rear is at
100! the thing is i have 192K miles on it.
someone had it rebilt im gessing.
but i still have the same problem
power loss at 3500-5500rpm.
but win its cold it runs fine until it warms up then the power loss hapens. its not a stedy power loss but rather
jumpy. the power kinduf goes up and down in that rpm
range.

ViperKillerWannabe

Bad grounds maybe? Check the firewall ground. That was missing on my car, and it would just fall on it's face about 4k rpms.

DUSTER

thinks ill chek that

beefhole

iTrader: (29)

He removed the cat in a series 4. It has most likely effected the back pressure, hence his ports are not opening.

DUSTER

you mean the actuators not opening well the are i dont
know y but the are

DUSTER

id also like to say nice mech. im a mech fan aswell

DUSTER

well i checked the firewall ground or at least thats what
i think. what i checked ran from the top left side of the firewall to what looks like the top of the trany on the back of the engine

DUSTER

anyone have any more thoughts