mazdaspeed101

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

vosko

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

Baldy

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.

1Revvin7

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.

1Revvin7

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

YucA

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...

j9fd3s

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



mike

Baldy

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.

Turbo II FC

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

Turbo II FC

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.