It can only be, wiring which supplies power to the injector, the injector itself or the ECM. Which injector doesn't fire?

 

I think there is only one injector driver. You can check the non firing injector pigtail with a noid light to see if it’s getting a signal to fire. Iirc the injector should ohm at 2.5 ohms.

 

According to this schematic there is only a single injector driver for both TBI units:

https://www.autozone.com/repairinfo/...00c1528008e871

Since you have one of the two working, that would generally indicate a bad injector, or a wiring issue - probably in the engine harness area as the wiring likely has a junction feeding ground from the ECM to both injectors in the engine bay harness. Ohm the injectors, and then if that's ok, find your 12v+ on the working injector, and check that same pin on the non-working injector to insure both have good voltage (use an incandescent test lamp to insure good currant also), and then if you have good voltage, disconnect the computer (to avoid sending any voltage to back to it), and ohm the ground pins to the injectors - they should be connected with 0.0 ohms.

I've never worked on one personally, but this is just general diagnostics.

GD

 

 

From what I've read its a dead end since no one makes a manifold (anymore) that will flow decent numbers. The TPI system is readily available, more reliable, and better performing in stock form. The crossfire manifold has CFM numbers that are extra special pathetic - I think the manifold is quoted as flowing 475 CFM. Stock TPI is something like 750 and with some modifications can flow 300 HP. There are direct TPI replacements that can easily flow 500+ HP using the same electronics, sensors, etc.
.

 

 

https://firstfuelinjection.com

Its a drop in replacement for TPI cars (with tuning of course). Which you could swap the car over to with parts from an 85+

GD

 

My modded CFI 350 makes 250 RWHP - see mods list below. That's with a tiny cam that was picked to run with the stock ECM. I ultimately upgraded to the EBL Flash ECM and made the number with that tune. Will do a cam swap at some point. I think 300 RWHP is doable, which would be 325-350 at the crank. Of course, all of this costs money...

 

I don't think so, esp not out of d00d's 305.

Personally I suspect you've pretty near maxed out what CFI has to offer... low-mid 300s at the crank of a 350. Not much by modern standards, let's say compared to a stock 5.3 or something except with similar $$$ thrown at it (headers, exhaust, H/C/I, ...); but not bad either, for what you're working with.

OTOH I have no clue whether Renegade still exists, and/or whether they still fiddle around with that old obsolete stuff from 35 yrs ago. THIMK... that's A LONG time... if somebody where you work, no matter where that is, retired after 35 yrs, it would be somewhat remarkable. Somebody making a single-application retrofit like CFI intakes would be in the same class of things. Maybe if they made too many back 20 or 25 yrs ago and they hadn't thrown em all away, maybe have a few still sitting on some shelf in the mini-storage that they forgot about, ... maybe. Otherwise, odds aren't in your favor.

 

I don't think the Renegade manifold is the limiting factor and the bored out TBs flow enough air for more than 300 crank HP. My current limiting factor is the tiny cam.



There are several places online where you can buy a new Renegade intake today - Summit and Jeg's for example. They came out with it around 2010 and internally it's a much better design.

 

For the price of the manifold though..... I see it as more of a collectible Corvette upgrade where you want to leave it basically original under the hood.

For not that much more you can do the First TPI setup and there's a lot more support for tuning, injectors, and it will overall flow a lot more since its a total induction system including throttle body rather than just a manifold base. Its less than twice the price and you get so much more.

GD

 

I guess it all depends on what you want. I'm fine with the current power level for now and I think the system can handle a bigger cam and another 50HP or so. What I like most is that you just don't see that many CFI cars anymore, especially good running ones.


As far as tuning goes, I have an EBL Flash so tons of support here. Tuning CFI no different than tuning a 2-bbl TB.

 

I have a friend that has a 1982 Crossfire Vette. We have actually considered maching a top plate to fit a L31 marine lower intake. Use the throttle bodies for air only. Dress it up to look stock other than the fuel rails for the PFI. Make some people really scratch their head as to what it is.

 

Id just go carb. Easy + simple. TPI does look cool though if you can pull it off. Lots of work.