How many people out there have an 1982 z28 with the 305 crossfire motor that acctually runs? I have one and it runs at about 80% right now. Love the car and need some info on getting it restored. there is, as with all rebuilds, lots to do. thanks

You probably won't find too much info here, as that system was fairly uncommon on these cars. You'll get some, just not alot.

Best bet would likely be a good C3/C4 Corvette board. They will probably have more extensive info.

So far i havent heard of anyone thats really had a lot of luck with the crossfire injection set-up, personally i would try and find a TPI set up, i dont know what you could do to make it run better with the crossfire tho, sorry

the crossfire can run good with proper maintainence. My sister has one like yours and it runs great.. watch this..
http://www.youtube.com/watch?v=HUbsOYPoQcw

I HAVE AN 82 Z28 WITH THE 305 CROSSFIRE SETUP AND I AM SWITCHING OVER TO CARB. MY CAR RAN LIKE A STRIPPED MULE, BUT RAN RICH ALL THE TIME. IT WOULD BARELY IDLE IN GEAR(AT) AND WOULD STALL GOING INTO REVERSE. SENT IT TO THE LOCAL SHOP AND AFTER A COUPLE HUNDRED DOLLARS, WAS TOLD THAT I WOULD BE BETTER OFF SWITCHING TO A CARB. I'VE RESEARCHED PAGES AND PAGES AND HOURS OF TIME AND IT SEEMS THAT THEY ONLY USED THE CROSSFIRE IN 82-83 ON CAMARO'S AND SOME 84 VETTES. I GUESS THEY NEVER COULD GET ALL THE BUGS WORKED OUT SO THEY CAME UP WITH THE TBI AND TPI SYSTEMS.
SORRY THAT DOESN'T HELP MUCH, BUT AT LEAST I KNOW I'M NOT THE ONLY ONE THAT HAD PROBLEMS.

The biggest problem with Crossfire is that the linkage between the two TBIs wears and they go out of balance. This causes poor idle and off idle stumble.
The IAC passages in the TBI also like gum up and get dirty.

A good cleaning and balancing the TBIs will usually get it running like a top.

http://crossfireinjection.net/index.html

Give him a call!

Good Luck!

I've had very good luck with the CFI setup on my '83. It's virtually identical to the setup on your '82. Dens71 is close on the linkage but it's actually the throttle shaft bushings that wear out (same happens to "regular" TBI units). They can be repaired and dctrumpet ( http://www.crossfireinjection.net/ ) gave the link to probably the best people for it. The TBI units can be bored slightly and here's and example
http://www.swko.net/~lionsden/crossfire.htm

Other things that can be modifed to benefit;
1) The lower intake as it's VERY restrictive. Port matching to the heads and cleaning up casting flash helps immensly.
http://www.technovelocity.com/chevyh...rt_polish.html
2) The exhaust manifolds , along with the rest of the system, is shared with the LG4. Changing to either a L69/L98 complete exhaust system will help the LU5 breathe much better. If you decide to go with headers then use the application for the L69 and not the LU5. Do the same for the cat and cat-back.
3) The rest is basic tuning for any SB Chevy to improve performance. K&N makes a replacement filter set for the CFI setup. You can improve on your '82's ECM with one for a '83 CFI F-Body or '84 Y-Body (Vette). You can move beyond even this in tuning as the same upgrades work for the LU5 as with any TBI motor.

Hope this helps and welcome to TGO

I currently am running a Crossfire setup with lots of goodies and it runs excellent . Although, to gain a whole lot more HP, and fuel economy, I am in the process of building a 383 LT1.

If you guys need the TBI base flange gaskets or the fuel meter cover gaskets I have those. Sometimes those are hard to find without having to buy a $40 kit at Advance, Auto Zone, etc.

PM me if needed. The link I left in a earlier thread is one of the best for cross-fire injection. They are a bit pricey, but very good.

i own a 1983 LU5 Crossfire as well

look into the DCS renegade manifold.

it's supposed to be a direct bolt on replacement for the factory manifold, and suposed to be a huge improvement.

http://www.crossfireinjection.net/DCS%20News.html

looks cool.

I bought my CFI about a year ago, and it runs 100X better now, than it did when I got it.

Make sure the bolts to the lower intake and upper plate are tight. Also, make sure the TB bolts are tight. These are prone to loosen and create a massive vacuum leak.

I have had mine for almost 25 years and early on was told that there was nothing to do with the system My 355 Crossfire is at almost 400 hp now without problems Porting the intake makes all the difference. Watch how big of a cat back system you use or you will loose the lower end of the power curve and get a good set of "shorty" or block huger headers and you will be on your way.

I thought that the 350ci crossfire was only on the corvette is yours aftermarket or

No mine is an original 305 Crossfire I changed the motor years ago after making a ton of phone calls to make sure it would work I have the 305 computer in the car with a chip mod the 82 or 84 vette computer did not work Lots of trial and error

awesome skills dude

I just got done working on an 1982 z-28 with the crossfire. It would fall on it's face as soon as you hit the throttle and then you would have to feather the throttle to keep it running. At first I checked fuel pressure directly out of the the pump (it was only 9lbs.)I replaced the pump (should be around 12-15lbs.) I then replaced fuel filter.The motor still stalled out upon take off. I then replaced the MAP sensor on the firewall and then took it out on the road. Big difference I had all the throttle the I think the car had new.Everything kicked in the way it should and ran great so don't pass up the Map sensor -- it is a cheap part(around $30 at most parts stores.Or go to a junkyard and grab a few different ones and try them that's what I did. 1892 Z-28 with the crossfire and 118,000 miles.

i put an'84 vette "L83"crossfire 350 in my (originally
carb)'82 z28;i used an'83 harness,esc module,and
pickup along with an '82 ECM running a hypertech '82
vette chip.Bone stock when first installed in1994,
it was ok at lower revs but quit pulling at around 4200
rpmSo the next year modified/ported the intake
manifold and did a mild port job on the heads-that
made all the difference,horspower and torque both
increased a very substantial degree and usable rpm
increased by about 1200 rpm-5500 no problem at all
Only major difference between305 f-bod and vette
350 systems is the injectors and the chip-manifold,
throtte bodies,ECM are the same

I have a stock '83. Runs very well, even though the fuel pressure is low - very common for the fuel pump to wear down on these. These engines should have 12 -15 lbs of pressure - but this HAS to be measured between the two throttle bodies, not before the throttle bodies - VERY important.

Quite often replacing the original fuel pump with the TPI fuel pump from '85 and up really helps with pressure as they pump at a higher pressure for TPI - it is on my list to do.

Also - these cars are very affected by vacuum leaks. All of the hoses around the fuel canister and the cruise control in the drivers side front area by the headlight get brittle and leak. Just replace all of them, easy and inexpensive.

The EGR valve can affect things as well as it has an effect on vacuum. The vacuum line can get brittle and sometimes they leak where they connect to the EGR. Also, if the EGR valve is plugged or frozen in place it should be replaced.

The map sensor as mentioned earlier is very important. If it is bad or the vacuum line is loose or cracked or leaking it will cause the ECU to go all over the place.

The other things that come into play are the temperature sending unit on the intake by the heater hose goose neck, the O2 sensor and the Idle Air Control valves and the Throttle Position Sensor.

All of these sensors and vacuum lines are 25-30 years old - they do age and they do fail.

The last thing that does have an impact are the bushings on the linkages to the throttle bodies themselves. The wear and can cause problems with effective operation.

You can have them rebushed at various other suppliers like DCS at http://crossfireinjection.net/ and you can learn a ton about CFI at the crossfire forum http://www.crossfire.homeip.net/

I also discovered after a bunch of work that someone had put in a replacement ECU that wasn't the correct ECU. Changing that made quite a difference.

I have replaced the ECU, EGR, the vacuum lines by the cruise servo, the O2 sensor, the temp sender, one IAC, the map sensor and the thermovac control inside the air cleaner cover (don't forget to always make sure the vacuum line to the thermovac is plugged all the way back in when you remove and install the air cleaner cover).

After all that it runs very well and probably cost less than $400.

Take the time to learn about the system. It is a simple system, but can be a very good system. The sensors and vacuum lines and EGR and worn TBI bushings are usually the problem and can be very easy to fix.

The people on this forum that bash CFI are doing so out of ignorance because they don't know how the system works and don't want to take the time to learn.

TPI and carburated cars are a dime a dozen. The CFI cars are much more rare and lower production generally means more collector value. There might well be a day when the CFI cars command much more money than TPI because of the piece of automotive history that it contributed. The TPI and carb guys might not have such awful things to say at that point.

And oh by the way, there are quite a few third gens and Corvettes running well into the 12 seconds with CFI on 383 strokers, so they obviously have potential.

Good luck!

I Have An 82 Z28 With The 350 Crossfire
i took out the old 305 and now it runs good
Like n1ffer said 'The people on this forum that bash CFI are doing so out of ignorance because they don't know how the system works and don't want to take the time to learn'
dont let them put u down. crossfire is a good system and its has its ups and downs.. i have some roblems with mine but ima change all the sensors and see if that helps
Good Luck!!!!!

what problems are you having with your C/F Antlocks?
I also forgot to mention on my post above that when
i did my C/F conversion i used '85 2.8 FI fuel lines
because they ran along the LH frame rail instead of
having the feed line cross up over the tranny to the
RH frame rail.

Well wen i drive the car and i step on the gas the car pulls and hesitates.. many people told me that i have a vacuum leak but i put silicone arround the top lid of the tbi's but i still get the same response.. im thinking the TPS or The IACV not really sure tho.. also my SES Is On

Probably is the tps-that is the only part i have had
act up on mine in over 15yrs...
Just do "the paper clip trick"to see what codes are
stored

Yea Im Thinking That Too
haha im sure gonna do that this weekend
i have a question.. i bought a lsd diff off some guy that had it in his 87 camaro
and i was wondering if it would fit on my 82?..

I have 2 cfi cars, an '82 t/a not a powerhouse, but I like it I took it to the dragstriphttp://youtu.be/iG_t_XOmBI8 I am in the prosess of changeing the trans to a 700r4. so far I have been running an 84 vette ecm with no truble.
The other is a '83 z28(wife's car) I just got done with a conversion to a t-5 and 3.73 rear gears, the car is stock otherwise, and it will scare you if you are not careful on the gas.
there is no reason that the cfi cannot be made to run good, if a shop trys to get you to change to a carb, walk away and find another shop.

check out this thread http://www.thirdgen.org/techboard/te...ve-1983-a.html (Help I have a 1983 Trans Am , CFI , cant drive it , need help) what codes do you have, jumper "A" to "B" in the aldl and count the flashes

I Noticed that wen i do the paper clip trick my hood flaps open.. is that normal?? haha
and the codes are ...12. 22 .44

not sure if the hood flaps opening is normal,but the
22 and44 pulled indicate- 22:tps fault and 44:lean
exhaust detected.Code 12 just means the diagnostics
are working.Easy fix

Ohh Ok
So All I Need Is A New TPS and O2 Sensor Right??

probably only a new TPS-bad TPS is likely the cause of
the lean exhaust.
BTW you can check the tps with an ohmmeter if you
have one handy(there is always a chance of a wiring
problem setting a code...)

Oh Ok
Thank You Very Much 8t2 z-chev!!