87 T2, the car hesitates pretty bad till boost comes on and then will only rev to 4,000 rpm, so my only assumption is that my secondary injectors arn't comming online. The injectors should be good, they are new mazda 550's went in 6000 miles ago when the engine went in. I'm not sure when this problem started due to the fact that i just picked the car up yesterday and only have limited information on the car. I fixxed the stock firewall to rear housing ground.. .didn't do anything. Right now i'm in the process of removing rats nest and all emisions, that should help me narrow it down. Also the car has racing beat 3 inch turbo back, FCD, 3 inch TID, Walbro 255lph fuel pump, no a/c, no p/s, working on removing the rest of the emisions. Someone here must be able to help, throw out ideas i'm open to trying anything. This is my first turbo'd 7 and it feels awesome when it's boosting, i just wish i could rev it past 3500 rpm. . ANY HELP would be great. Thanks
Dom

 

Well, it's not that expensive and certainly alot cheaper then blowing your engine, i would just take the secondaries out and have them flow tested. Eliminate a fuel problem from the equation before anything, then check timing.

 

I'm gonna have my 680's from a gsl-se parts car i have cleaned and flow tested and put those in as secondaries. But what would cause the secondaries not to come on? thanks
Dom

 

bump before bed

 

Your going to have to be clearer about how the car only revs to four grand.

Let it be known, that any RX whether turbo or non turbo will rev to seven grand without the secondary injectors operating. That is a true statement if you drive gently thru the 3500rpm range all the way to redline. Gently just means not using boost but just accelerating to redline without the pedal floored.

So the question is, will the engine rev over four grand if you ease the rpms over that figure.

It sounds a lot like you've got the sparkplug wires on wrong or the timing is screwed up really, really bad. Or a apex seal gone here or there.

 

Try 1/2 oz. per gallon of gas of 2 cycle oil. I did this recently and it cured my hesitation problem. I cannot explain why, the Jury is still out on that one. I can't guarantee it will solve yours but it won't help. If 1/2 oz per gallon don't work try 1 oz per gallon. Thats what I originally put in so that may have done it. I now run the 1/2 per gal. even with a fully functional OMP system. Rotaries love it.

 

i fought a nasty hesitation for a couple of months and checked everything and when i was about to loose it i checked the injector connectors and thyey were a little loose
but it could be a # of things
usealy hesitations are caused by lack of fuel or lack of ignition

 

come on now, i'm not a nooob. The secondaries are not comming online. The car will rev past if i ease the throttle and stay out of boost. My apex seals are fine the engine has 6000 miles on it. I know the problem is that my secondaries wont come on, but what would cause this. There are hooked up, there is fuel pressure, and the harness was grounded(stock ground) I'm not stupid the plug wires are on correctly, it's lack of fuel not an ignition problem, ignition may cause my hesitation problem, but i think it hesitates because i'm running rich. anyhow what would cause my secondaries to not work? thanks
Dom

 

Dead fuel injector drivers would cause them to not work. You say you have the plugs on the injectors and your not a nooob, so you must have already looked and see if there was/was not battery voltage at the secondary injector wires at the ECU.

Then you must have put a meter on one of the secondary wires at the ECU and gone for a drive and seen/not seen the voltage drop as you went over 3500rpm with a load on the engine. So since your not a noob, did the voltage drop on the secondary injectors or not when you were under load and over 3500rpm?

*************boost comes on and then will only rev to 4,000 ************* Got me what you meant by that. It either will or will not go over 4,000. You just wrote it would not then reply it will.

 

Ok so my description wasn't the greatest. I didn't mean to offend you or sound sarcastic it was just that your post made me sound stupid. I have not tried checking the voltage at the injectors. What/where are the fuel injector drivers? Again sorry for the previous post i expect as much respect as i give here i know that with some people you have to act like they have pretty much never seen a car before. . Anyways thanks for the ideas anymore help would be great. thanks
Dom

 

so TII's have a pressure sensor like n/a's that control when the secondaries come on? if that went bad they either wouldnt come on or would be on nomatter what throttle you are at above 3800

 

The pressure sensor on the passangers side strut tower? or a different one. I was thinking that the pressure sensor was possibly bad because my boost gauge hasn't been reading correctly i don't think.

 

How could i test my pressure sensor?

 

im sure its in the fsm or a haynes. im not sure about turbo but if you unplug it on an n/a it just opens the secondaries any time you are above 3800 WOT or not. try that to see if they turn on unless it ***** with the boost

 

yea doesn't affect it.. . hmmmm i guess i'll have to check voltage when she's back together

 

bump for some answers.... <.......future t2 owner!!!!