ok guys, 120,000 on car new plugs, wires, air filter, fuel filter, ALL emissions removed, ps and ac removed, 6pi removed, new intake mani gaskets, no vac leaks that i can find. did a compression test a few hours after i last drove it, removed both leading plugs and held WOT, had 82psi on the front and 90psi on the rear.

now on to the problem, it has basically no power at all. you have to rev to about 2500-3000 to take off or it bogs out and almost dies, all gears are very slow, and you can really even use 5th gear. i could be 3000rpm in 5th and floor it and it does not rev up AT ALL. i do still have the 3.9 rearend from the auto trans, but i will swap over to the 4.1 as soon as i can. any ideas on why this car has no power?

 

did you have a noticeable power change AFTER you did the work to the intake or something? I don't really understand what you're getting at.... 82 psi is kind of low... 90 is borderline... N/As don't have much power to begin with; I don't know what you're used to or comparing it with... and 5th gear is almost useless in the N/A. If you need top-end acceleration, use 4th gear. 5th gear in my N/A was basically a "cruising" gear to keep the RPMs down : )

Josh

 

82PSI is really quite low.

Are you sure the leading plugs are firing? Also, what condition are the plugs in?

I'd say it was a clogged cat, but you don't have one (right?).

Have you checked timing? I had a FC that ran like absolute crap, turned out I was a tooth off on the CAS and running something like 25-30 degrees retarded from where it should be.

-=Russ=-

 

i don't even see why you are bothering to troubleshoot a poorly running motor in need of a rebuild. Use your time on pulling the motor.

 

all the plugs are firing and the plugs are pretty new. it has no cats on it either. to give an idea how slow it is, my daily driver 95 escort wagon with 88hp at the motor would easily walk the 7. checked the timing and its fine. also could the 3.9 rearend be making a big difference?

 

 

its your fuel injectors. Pull them and send them to cruzin to be cleaned/rebuilt and flow tested. One of your secondary injectors might be stuck wide open. This will cause a noticable power loss and black soot on your exhaust tip

 

Your compression is low, my NA has 105 and 110 for compression at 110,000 miles and it has plenty of power, beats any economy car even with (light-moderate) mods. So the guy who says they dont have much doesnt give enough credit or doesnt really know. With that kind of compression you are at the virge of a rebuild and shouldnt be concerned with driving it fast.

Baby it, rebuild it ASAP.

 

ok, so it loks like i have to do a rebuild on it, damn that sucks,
but i might hold off on it for awhile because my rx7 friends tell me that i need to drive it a lot and hard to build the compression back up. when i got the car, it didnt even run and the compression was like 70psi right after i got it to start, so it has already come up a good bit.

 

Well, it depends on your fuel system, if you have troubles with excessive flooding or a leaky injector, gas will lower compression and drive like *** as well. That and removing your aux ports isn't exactly the smartest idea in the world.

 

My suggestion is rebuilt before anything goes, like the rotors or housings, cause those are expansive to replace

 

well the 6pi was seized up so i said screw it and took them out. it is still kinda hard to start, but not to bad. i have the fuel pump hooked to a switch, i just crank with it off of a sec or two then flip it on. sometimes i have to turn it on and off a couple of times to start.

 

That's indicative of flooding. Your 6PI system will have nothing to do with this, nor will any emmissions equipment removal. I have everything strippped out of mine, and I can still get it to turn over with no problem at all. I'd also recommend that you get your injectors professionally cleaned and serviced (I had mine done at cruisin performance, awesome service with a free flow anaylsis on all the injectors). It really helped with performance! But if you're flooding your car (which it sounds like), revving/driving the hell out of it willn't do any good for compression..

 

well, i will call around to some desiel shops in town to get my injectors cleaned. and thanks a lot for the help guys

 

well guys i just swaped in the 5spd rear end with lsd and it made a huge difference. i actually have a little bit of low end power now. i actually raced my friends mostly stock mx6 and i pulled a couple of cars on him, so it has got alot better. i will probally still get the injectors cleaned, and maybee a SAFC to lean it out a tad.

 

Make sure and check the TPS as well...I had no power from 6-8k rpm in any gear after messing with the screw after we removed the 6 port actuators (straight 6port, no 4+2) so I knew something was off...same thing happened the other day when I messed with it and I know my car has top end power more than ever now, readjusted the TPS and now she flys...

 

tps is set using the 2led method