i just took my 89 T/A on a test drive and it felt SUUUPER SLUGGISH! i just recently completed a rebuild and noticed that the 5 and 7 injector wires seem to be crossed. what effect would crossed injector wires have on a cars performance? could this be the cause of the sluggishness??

 

No, All the injectors fire at the same time.

nick

 

That wouldn't make too much difference, all 8 injectors fire at the same time.
Check things like timing, and fuel pressure. How old are your plugs, cap, and rotor?


John

 

cap, plugs, wires, and rotor are all brand new. pretty much everything is brand new on there: (L98 bored .030 over, fully balanced, speedpro pistons, arp bolts, zz4 cam, decked heads w/3 angle valve job, 2200 stall, vette servos, 24# SVO injectors, vortech s-trim) running N/A till i break it in though. it seems like it doesnt wanna rev past 3500 RPMS.

 

Your going to have to be a litttttle bit more specific about what is doing, or not doing, If you want any help.

 

when i give it a little gas, theres a slight hesitation before it actually goes. power and acceleration both seem fine from about 1500-2700 rpms or so. once it reaches around 3000, it just refuses to respond any further. no gain in power, no gain in speed...nothing. fastest speed i reached on a 2 mile stretch of highway was about 65mph....the car just wont pull past 3000 RPMS.

im still using the stock ECM so that could be PART of my problem. although i dont think using a stock ECM with my setup would hamper performance this much...or would it? also, timing is set at 6* so nothing wrong there.

 

Pull a couple spark plugs and see what they look like, I'm no expert, but it sounds like your getting too much gas, has it thrown any codes?

 

Welllllll....

With the 24# SVO's On the Stock PROM your going to be running Very very Rich. But I Don't think that is the cause of your Problem

How does it Wind up In neutral ? Will it rev past that point w/o hesitation or not ?

Sounds to me almost llike your fuel pump is on its way out.

Whats your fuel pressure set at ?

You said timing was set at 6, so that should be okay. The only thing that makes sense to me is if your leaning out ( bad FP ) or your dropping spark.

You said all the ignition components were new tho, So Ill take your word on thee ignition being up to snuff.

Check that FP! If I had to take a blind stab, Id put my money on that with the information you have given us.

 

it'll wind up just fine in neutral, sounds real nice too .

im not sure what about what my fuel pressure is set at but it ran just fine w/ the 24# svo's before the rebuild.

ill try checking the fuel pressure and the fuel pump and let you know what i find out. if you have any other suggestions then feel free to inform me . thanks for your help.

 

something to check that may sound crazy but make sure that the spark plugs are going in the right direction, counter clockwise I think as far as the firing order, I had mine backwards and in park it would idle up ok but only to about 3 grand, I still dont know how it did it without backfiring or even running at all but once I got that straight it was good to go

 

I thought the injectors fired in pairs....

 

nope....TPI is a batch fire system...all 8 at the same time...

 

Simple I had the exact same problem. Would not pull past 3000 untill it warmed right up. Usually about 10 mins of driving. At 3000 it would fart and pop and backfire. The problem was a bad fuel pump, and my fuel pressure was set to high. Once I dropped the pressure and swapped the pump the bastard was going like a bat out of hell. Just a thought.

Good luck

 

AFAIK, a "batch" fire system means that each bank of injectors fires at the same time....so all driver's side injectors fire at once, then all pass. side fire at once.

This is why you can switch injector plugs from 5 and 7, but not from 7 and 8.

SFI is sequential injection, which fires the individual injectors in an exact sequence per cylinder, like the timing order for ignition.

I think that you have major tuning issues and that the SVO injectors are your issue. Cause the injector constant is still off.

You should have a chip burnt for now and start learning how to burn your own, I wouldn't f-around with it as if you go too lean, BOOM!!!

Good luck,

 

If you look at the wiring diagram for the TPI ECM, you'll see that, though there are two output drivers and fuses, inside the ECM they're connected together. The TPI fires all of the injectors at the same time.

 

That is interesting about the drivers...so why are there two drivers then? Is it is a load issue for just one driver?

 

actually if I remember from the wiring schematics, the right is all wired together and the left is the same, but the drivers fire at the same time