90 gxl 6500rpm problem
 

i own a 90' GXL and my car has been a great daily . only flaw is I CANNOT GET PAST 6500 WITHOUT STRUGGLING !! With the car in gear and the clutch in i can get the rpms up to7800-8000 .. so basically when the car is under Load i can not get past 6500RPMS !! if i drop into second gear into about 5500rpms i can sometimes get past 6500 but it still hesitates badly and sounds very unhealthy at that point and that point only.. I tried getting past it and it just sounded like i was hurting the motor making it lean out or its too rich ?? not sure if its a fuel problem or spark . i used to hear my injectors vibrate with the hood popped and the car off but in the on position .. so My stupid guess is a problem with My Secondary Injectors , Bad Ground for injectors or Ecu , Bad Ecu pin , or maybe bad trailing coil or lead coil ?!? I'm clueless .. :scratch: any input on any kind of diagnosis i could preform to get to the bottom of this would be greatly appreciated !

Have you checked for error codes for starters? There is also a thread w/the very same problem a few threads below yours you can look at for some ideas.

Another 6500 rpm wall thread. Contends it was the TPS all along in his particular case.

https://www.rx7club.com/2nd-generati...r-load-668729/

thanks for the advice , my friend has an s5 he recently went turbo and went with a standalone and doesnt need his tps anymore . I will get that from him and report back with results ! thanks Satch !!

You could also check and make sure all your grounds are connects tightly and getting good proper ground. I had this issue and it was that i had a ground not tighten all the way and once i did it didn't have the hesitation any more

only error code i have is an o2 because of my second o2 is deleted .. i checked my tank and it isnt dirty , changed my fuel filter and still sputters or w/e @ 6500rpm =[

i guess the main battery ground doesnt look too good , its kinda coated in looks to be ps fluid and grime .. should i take it out replace the screw and sand down the paint to metal or just relocate ???::scratch:

changed and cleaned the ground and nothing .. gonna adjust / replace my tps next ..

Check your spark plugs and wires. My plugs look like shit after 15k miles and the car runs less efficient. I had a similar problem and one of my sprk plugs enamel was cracked and sparking on th eblock instead of inside the engine. That and a tps adjust is always a good idea.

S5 N/A and TII tps's are different.(according to Mazdatrix website)
and Question: what aftermarket ECU is your Buddy running that does not use a TPS?

I had a similar experience with my TPS being the culprit. Even went so far as to throw a front secondary injector code but no problem with the injector or wiring.