vicious525E

i havent gotten to work on my car in a while, mostly because iv been starting collage this year, and moneys been tight. but i need to get it running, the parents are threatening to sell it and i have no idea whats wrong. to get started it has a jspec s5 motor in it. most everything is gone, the bac valve, it has the tb mod done and all the vac lines have been rerun. you should be able to read my sig and get a good idea, its mostly just motor. the bac valve is out of it, and it has s5 injectors running on the s4 ecu. me and my brother think it might be the injectors, but i'll get into that in a sec. its running premix, but in the few test runs we've had, we've run straight gas. the cars really hard to start, like you have to keep the gas floored and it cranks for ever before finally turning over. when it does it wont hold an idle, i know there isnt a bac valve but still, i would think with the throttle stop adjusted and the tps sec accordnly it would. but it doesnt. it seems like it has a vac leak almost, but i sprayed carb cleaner around and nothing. the few times i got to drive it, it would run alright, but seemed really, i guess laggy is a good word, when you floored it, it just fell flat on its face, just bogged way down. like i said before it has s5 injectors, but i took out the resistor block at the front passenger side of the engine bay and soldered all the wires togather. when i first got the motor i did a compression check and it did fine. so we think it might be the injectors, ether that or i think that the compression might be too low since theres no oil in the chamber. i ordered a set of injector caps from mazda trix for the old injectors that where on ther, but ether you have to force them on, or they sent me the wrong ones. one last thing, i wasnt sure about the fpr, so i ran it to the outside nipple on the lim, it is the same nipple my bov is run off of, but i wouldnt think that would make much of a difference. it really bugging me, and with the amount of money in this car, i dont want my parents to sell for a few hundred, but more importantly, i dont want to loose my baby. the car seems like its just getting way too much fuel, and the o2 sensor isnt hooked up yet, so i guess it could be running a little rich, but i thought that wouldnt make much of a difference. i dont know, i just would like some ideas, please help me.

Icemark

well (besides being hard to read, remember the fuel lines are reveresed on a Jpsec, and it sure sounds like you also have a vac leak.

vicious525E

so the incoming line goes to the top fuel rail or the bottom?

vicious525E

comeon, thats a easy question, someone has to know.

RETed

First of all, can you please use proper punctuation and sentence structure?
It was a headache to read!

Okay, I dunno what "injector plugs" you're talking about - fuel injector electrical plugs?
You had to force them on?
Are you sure the key going into the proper slot?
Early 1987 turbo fuel injectors are "key'd" differently than late 1987 + 1988 turbo fuel injectors.
If the key doesn't line up (early is centered, while later is offset to the side), you risk breaking the plug!

If the fuel injector electrical plug is cracked, that would cause an intermittent connection!

I don't think the fuel lines are swapped - if they were, the engine would not run period.

It sounds like the engine is getting too much gas or too little of it.
Can you pull the spark plugs and describe what you see?
Are they really black and crust and smell / wreak of gasoline?
Or are they really clean?

You might want to check ignition timing.
Do you have a timing gun to shoot ignition timing?


-Ted