When my car was cold, it would get the studder, i just assumed it was okay and it would work itself out...well one day while the car was warm, out of nowhere it started doing the studder all the time..it pretty much doesnt do it until it goes into boost around 4k...except in 5th it boosts fine until ~4k...and I was also told when it does this studder, its shooting out small flames, so i didnt think it would be the normal secondary studder, maybe coil or plugs? any help appreciated...thanks

 

3800 rpm hesitation?

 

im guessing so...but as i was saying though it seems to be getting fuel..and all the grounds seem to be fine..

 

https://www.rx7club.com/showthread.p...highlight=3800

That thread might help.

 

My car get's this too. It's like the problem that is impossible to get rid of.

 

If now it studders all the time when you get to four K even when not in boost, then check and make sure the vacuum line to the boost/pressure sensor is connected up and putting out.

If that vacuum line is disconnected from the boost/pressure sensor, then anytime you go to approx 3600 rpm the secondarys will come online. When that happens the duty cycle to the primays gets cut in half as the secondarys open.

IF the vacuum line is good, then the secondarys won't come online unless the ECU sees boost, more or less. This is a turbo. I forget.

 

it will rev above 4k with very slight throttle in every gear but 5th i think..very hard to ease it by in 5th gear...if that helps any

 

i had that, would go past 3800, pulled the injectors, two stuck open and on was cracked :O

 

i checked the pressure sensor...ground seems to be okay, line going in is good, TID has no leaks, along with the intercooler pipes...unplugged the TPS and it ran the same..gonna change the plugs and see what that does, it needs them either way, then ill check the injectors

 

new plugs same problem..i guess its the injectors then, ill go ahead and do the upgrades when I can..i dont have a coil to swap out with mine to see thats it

 

any other ideas?