HELP!! I Need a guru quick!!

I swapped a jdm s5 engine into my vert. I also swapped in a TII tranny, ecu, afm, map sensor, air intake and drive train. It turns over alright...(though it sometimes takes a while and needs me to push the accelerator). I'll put it in gear, and it still idles fine....but when I hit the gas, the rpms drop off very quickly. The only way I've gotten it to go anywhere is with the clutch halfway in (and even then it's incredibly sluggish). I checked timing....and it is off, but when I go to adjust it, the closer I get to getting the timing right, the lower the rpm's go and it just conks out before it's right....and then it won't turn over unless I throw the timing off again. I thought maybe it could be my fuel pump (I kept the NA one), but that wouldn't explain my timing phenomena. I'm almost certain the problem is either (1)timing, (2)fuel or (3)electrical. But, after about a week of troubleshooting, I'm really no closer to an answer. Neither the factory manual or the Haynes are any help... Could a bad ecu explain all of these issues?....Anyone else ever had this problem? HELP!!

 

Come on people....there has got to be someone here that can give me a strait answer and help a sista out.....Mark? ..... Aaron?.....

You can't honestly tell me that in the 20+ years 2nd gens have been around, I'm the 1st person to ever run into this problem.....now how do I fix it?

 

the CAS could be 1 or 2 teeth off, with it stabbed correctly the nut should be very close to the center when timed properly. that may be your timing issue. i dunno about the rest. hey, at least i posted something

 

ECU problem is possible, haven't heard of this one but could be.

Is the JDM a turbo? Sorry if that is a stupid question, but I'm not from Japan. If this is a turbo swap then I suppose things I'm utterly ignorant about could be wrong.

You could try adjusting the idle, timing, TPS and mixture settings a little at a time. Sounds like you could be killing it before everything is getting along with each other. If Fero's suggestion isn't right, look for intake leaks next, then check what I said above.... Sorry if my thoughts weren't linear, just trying to throw something out there for you.

 

All RX7's in Japan were turbo. They only graced the U.S. market with N/A's.

 

there were plenty of N/A RX-7s in Japan.

 

Erm, I thought they were all turbo from the factory...

 

Sounds like a big vacume leak or TPS setiings.

 

Depends on what generation you are referring to...

 

Can't you just let me be "right" for once?

 

CAS is lined up as it should be.

I'm about 99% sure it's not a vacuum leak, we checked for and virtually eliminated those.

How do I check the TPS settings?.....

Also, today I noticed a disconnected plug on my wiring harness...but I can't find where it goes (it's mate)..... It's a round black connector with wierd fin things sticking off of it and a square plug inside it. It's near the manifold and on the harness next to the fuel injector connections.....what is it? and what does it plug into?....could it be the source of my problems?

.....could it be that the fuel pump is too weak?
.....I still think maybe it's at least partially the ecu.....but I really wouldn't know (that's why I need your help)

 

Ahem.....Bump......


.....Honestly, Is there not one person in this forum that can step up and answer when a person actually has a semi-difficult question?....at least tell me what that connector is^(see previous post)

 

Maybe if you helped US, we could help YOU.

Only covered 82304934 times. This is NOT a semi-hard question that you can easily answer for yourself.

What color are the wires going to it?

 

I figured out how to check the TPS easily enough, but that isn't my problem.

The semi hard question I am referring to is the first question I posted in this thread....which, btw, still has not been answered, because none of the suggestions so far have worked.

TPS is good. CAS has been checked and is stabbed right. There are no vacuum leaks. I have gone through both the Haynes and factory manuals front to back, page by page, but to no avail....Thats why I turned to this forum in hopes that someone here might know more than a book. My only thought is that it must be the ECU, but I'm not about to throw down that kind of scratch without confirmation that it's really my problem.

As far as the connector goes...it's the only connector on the harness that fits my description. I'm not sure about color, but I think it's green (I'm out of town, so It'll be a while b4 I can confirm that)

Thanks for all your help so far and I hope this'll generate more possible answers.

 

Answer a few questions:

What year is your car?
You checked the TPS (x2) and they are set per oem standards?
Are your spark plug wires on there properly?
Why would you keep the N/A Fuel pump? (this will not provide enough fuel)
Is the fuel filter new?
How did you check for VAC leaks? (I thought my car was water tight untill I was pressure washing the engine bay the other day and the car sputtered when water got sucked into a vac leak somewhere.

Calm down, we are trying to help, no need to be so "b itchy.

 

The Car is a 1990 (S5) Mfd-12/89. (I swapped S5 for S5 just to keep things simple)
TPS are set as per oem standards.
Spark plug wires are well seated.
I kept the N/A fuel pump in order to keep the cost down. The figures b/t the N/A and TII pumps are so close, I figured it would work....tho I do Intend to get an aftermarket pump as soon as funding permits....will a new pump fix the problem with the dropping rpms on launch?
The fuel filter is about a year old.
I checked vacuum leaks using 2 methods. First I just did it the old fashioned way and sprayed starter fluid in various places all over the engine block. Then, just to be sure, I had a friend that works as the chief mechanic at a local Dodge dealer also check for any leaks (I'm not sure what all he did, but he is certain there are no leaks now)

Who's being b itchy? Frustrated maybe, but not b itchy. I heard that this was the best place to get help troubleshooting RX7 ploblems. I'm just relaying info and asking questions. Any emotion you might draw from any of my responces is simply conjecture. I really do appreciate all the help I've been given so far (Although the original problem has not yet been fixed, in the persuit, I have notice other smaller problems and fixed them thanks to suggestions)


Thankyou!

 

The N/A pump is only good to around 200rwhp.

 

Get your meter out. Go to the CONTROL UNIT pages in the FSM. Compare your readings with the readings in the FSM. Then reply as to what the big differences were. And as JRAT would say *what do you get when you download the codes?*.