Would anyone know why my car slows dramatically when i hit 4000 rpms I still get boost till i get to 4000 but i thought it might be a bad cat but i punched my cat out and it still did it. I seems to go away after i drive for a while and then i comes back and starts hesistating again. I have asked people but no one can figure it out. I have a 87 turbo 2. If anyone tell me what is up, let me know. thanks

jason

check all your grounds if those check out possibly something wrong with your ecu or secondary fuel injectors



i'm moving this to the 2nd gen forum

Mine's an N/A, and stutters at 3800rpm, someone told me that was common, and that I needed to "reground my ECU," which I have yet to figure out how.

I think they mean what vosko said, Reground all the grounds on the wiring harness. I would have to go check but i know there is 1 going from the engine to the firewall near the windshield wiper motor. There is one going to the tranny near the slave cylinder also i believe. There is on on the block also right under the dynamic chamber too. Just go along the wiring harness and looks for grounds. Put in new bigger wires and make sure the contact area is free from paint, bare metal.

yup, its either bad grounds, ecu, the wiring harness, or the secondary injectors.

Baldy...bout the N/A...Mine was diong the same exact thing. it was the secondary injectors. the plug for them didnt have good contact. i cleaned them and cleaned the secondary actuators, and i never had the problem again...



my car would just studder at about 3800-4000rpms. if i would baby the gas, it would go through and at about 5-6krpms it would get better...

the problem ground is the one under the intake, on top of the motor.



mike

You'll have to pardon my stupidness....this shows how much I know about these cars: Where are the secondary actuators, and what do they do? I understand the plugs and wires, but I'm still getting used to the terminology with the rotaries.

So the ground underneath the intake manifold causes this? Ive been having this problem for so long I cant remember what taking it to redline feels like. Is there any way you can post a pic of that ground or explain in detail where the ground comes from? Thanks

You'll have to pardon my stupidness....this shows how much I know about these cars: Where are the secondary actuators, and what do they do? I understand the plugs and wires, but I'm still getting used to the terminology with the rotaries.[/quote]

Baldy, the secondary injectors are directly underneath the upper intake manifold and require you to take it off to access them. The secondary injectors give more fuel when the engine is under load at 3800 rpms. So if power is not there at or around 3800 and on, it could be the secondary injectors.

http://nopistons.net/albums/album70/aac.sized.jpg



somewhere in that red circled area is the ecu ground, they had problems with it being loose from the factory, its also easily missed when you change the motor



mike

Does that ground connect to the firewall above the vin #? If so, it was disconnected but I reconnected it and it made no difference. But thanks for the pic.

thats a different thing



mike

so is there only one ground for the ecu and is it at the firewall by the windshield wiper motor.

no the ecu ground goes from the engine harness to the top of the motor.

the one at the fire wall is something else



mike

so would I have to get a new wiring harness and if i do would anyone know much one would cost

do i have to remove anything to get to that harness like intercooler or intake manifold

I've also heard the position of the MAF may contribute to the hesitation. For example, some of the intakes require you to twist around the MAF from its original position like the BONEZ.... Also, I heard an extra ground on your fuel pump may help.

usually you just have to make sure that the ground is clean and tight. since you in there running a wire from that to the battery might not be a bad idea



mike

i think i might have an intake leak or a bad vacuum line because i can hear air when the engine is running i think i might have might have a bad intake manifold gasket. would that effect anything

Umm yes, but mostly at idol and low rpms... It shouldn't make much diffrence in the 3800 rpm up range...



you may want to change your fuel filter, but more than likely your going to have to get dirty and rip the upper intake manifold etc off to fix your problem..

yeah i am going to have to replace the fuel filter i havent done that since i had the car and is hard to take off the intake manifold on a t2. i noticed though at idle my car dont stay at a set rpm and it usually dies if i dont warm it up

welcome to the world of old cars. if its not one thing, it another. as much as i love fixing stuff on my car, i hate diagnosing the problem. tell me what's wrong, and i can fix it. figuring out what's wrong, that's the hard and fustrating part, especially when this is my daily driver.



an again, i have somehow managed not to study for my poli sci test. no surprise there.

If it still dose it make sure you're 6 port actuators are working rite. around 4k they open up like a 4 barrle carb, some times they stick and don't open causing the lag you're getting.

is there a way to fix the ports so they dont get stuck or do they have to be replaced

wire open your 5 and 6 ports, its in the faq sectio, but in any case, they are under you IAC VALVE, open them and put some twistie ties, hope this helps, if not USE THE FOKIN SAEARCH BUTTON! kidding, lol its defenately in the FAQ section, after i wired mine open, car keeps pulling after 4k hard, no hesitaion no slow after 6k i like it, and who cares about low end? if you want low end get a 5.slow

is it an easy job or is there alot of stuff to take off

i stuck fuel injector cleaner in my car because i havent done it in awhile and i didnt have the hesitation for a whole day and a half and then today when i was going to work it started doing it again and i thought that was the problem. I have new injectors

would it matter if i stuck more injector cleaner in

maybe you got a faulty injector or clogged fuel filter ?

btw, all that crap about the 5th and 6th ports doesnt apply to turbo cars, you said you have a turbo2, so disregard it all. (not sure if anyone else pointed this out... too lazy to read over everything)

yeah i just found that out tonite talking to a guy that works on 7's

your secondary injectors are probably having trouble coming on, since it's around there that they kick in... it can be ground problems or harness problems, or the injectors might just be dirty/clogged, you might also want to check yer fuel filter / replace it (can't hurt). hope it's not detonating > 4000rpm due to fuel issues, can be quite catastrophic to a rotary.

that is what i was thinking that there was something wrong with my secondary injectors i am going to check it out tomorrow at the base hobby shop and see if there is anything wrong with my injectors and if there is i will be mad because i got those injectors a year ago and only drive my car to work and here and there i dont the injectors should go bad. I had to pay alot of money to get my car fixed, I am getting alittle frustated with it.

Ah ha.. I see why you asked if we were military in the other post.. What branch are you in.. I beleve that FDOkinawa is currently in NV as well since they kicked his butt off Island.. shoot him a PM...

im in the air force i have some friends that are out there at misawa