cloead

This isn't a hesitation at all, they just dont fire, at 4000 rpm my car just stops, sputters, backfires a bit, etc.

I checked for the orfice thing in the pressure sensor line, it was there. Just ran a ground from the pressure sensor to the shock tower and have the same thing.

I would check if the injecters are plugged in.. (this motor was just installed by a shop in indiana, dont think it was a rotary shop) but i dont know where they are. =/ looked in the haynes but i couldnt get an idea or anything of what to look for. the car will go passed 4k if i dont mash the throttle and just apply slight pressure.


ANY HELP would be greatly appreciated..

cloead

oh and the car idles fine.. sometimes when i pull into my garage it bounced a little bit between 800-1200.. but then it settles down after a couple minutes.

darkwaveboi

if you look there is a fuel rail above the intake manifold, underneith will be two things sticking into the intake manifold. They have electrical connections at the top and the connections are colored.

procedure: take off IC, take off UIM. Look down, and there will be 2 fuel rails, the upper one (longer) is the 2ndaries

cloead

k thanks...

cloead

anything else it could be? thats a lot of dissambly to start at 9pm

dr0x

You could check the pin voltages at the ecu to see if anything is malfunctioning. Its a lot less work than ripping apart the upper half of the motor. Just rip up the passanger side carpet, unbolt the access panel and start testing voltages. 4b-31 of the FSM.

http://www.iluvmyrx7.com/2ndgen/manu...tems_turbo.pdf

Id think its more of an electrical problem than them forgetting to clip on the fuel injectors.

cloead

allright ill check that asap

Therx7ist

Here check this out, I've been going through a similar problem





https://www.rx7club.com/forum/showth...hreadid=219890

cloead

so a new boost sensor was the fix? how could i test mine?

bkapold@aol.com

I need more info, but it doesn't sound like its that the 2nds aren't coming on... is it leaning out? I would first verify that... 2nd it could be the TPS is out of wack or just bad..... any codes? what year? You may have A-bad injector, the MAF might be f'd, the OMP maybe in limp home mode if its an S5 ecu, possible intake leak when boost kicks in, etc......just trying to come up with other ideas here....Let us know more.. Check to make sure all the O-rings on the injectors are good, If there old and cracked they'll suck air... ohhhh, check to see if the fuel ressure REG (on the firewall side of the 2nd fuel rail) that a vacuum line is okay going to the manifold

Brad

cloead

its an 88 t2 (in my sig) its like the secondaries arent coming on.. it gets to 4k and just surges.. trying to passt.. but cant. right now im just trying to avoid pulling the upper half of my engine apart

RyosukeTakahashi

I had the exact same problem. I would gun it, then all of a sudden at around 4grand it was like hitting a wall. The RPM's just wouldn't climb up at all.
I took it to my local RX guru and he cleaned out the electrical connectors/ replaced the resistors for the injectors and after that the secondaries would work fine.

cloead

where are the connectors and resistors?

RyosukeTakahashi

let me look into that. I really don't remember where it was, but I'll talk to him tomorow and let you know exactly what happend.

but from what I described does it sound like your problem?

cloead

yeah dude it sounds exactly like it.. i can get passed 4k if i lightly depress the throttle.. but if i mash it, it hits 4k and it just loses all power.. wont go passed it no matter how long ive held it there (max was like 5 seconds.. it doesnt sound very healthy during the surging)

if you look into it it would be greatly appreciated.

thanks

dr0x

Mine does that when I dont have the orifice in the boost sensor line. I can ***** foot it past 4k with some small back fires, but more than 30% throttle and it just sits there back firing like a mother ******. Be sure to check that.

cloead

yeah i checked that.. it was there.

i pulled the line off the uim and there was this little black pill-looking thing stuck in the hole.. so i guess thats it.

cloead

dude drox imma cry if that was my prob.. i pulled the line that goes from the pressure sensor to the uim.. and there was nothing in the hose. there was a little nipple type deal on the uim but that was just so there was something for the hose to attach to.. shoudl the orfice be in the hose? because there is nothin in the hose.

dr0x

Ok, try this. Unplug the vacuum line from the boost sensor and put a bolt or a screw in it to stop it from being a vac leak. Go for a few runs in your car. Is it still doing it?

cloead

k i did that.. and it was still doing it, but now i couldnt walk passed it like i could before with light throttle

Therx7ist

did you try grounding the ecu yet??? I know it would help unless you have a bad secondary

cloead

im gonna look into this pill orifice thing, then the ecu grounds, then injectors (ehhhaslhkjdhajdh)

cloead

well autozone didnt have the pill thing, anywhere else i could check?

cloead

k we ordered the orifice thing from mazda (part number 8931-13-986, i think it was just under $4) and it will be here monday, ill keep this updated on progress!

Therx7ist

the grounds are something you can do right now. go out and do them, it's free