First time classic car owner.I m in kc so far had 5 mechanics look at it. Everyone says the last guy was a moron changes out parts yet cant figure it out. Has a rebuilt 84 board. If it goes over 2000 RPM either cuts out or Stalls.

Two suggested ripping off the crossfire and putting older design without even looking at it.

help ! Has new O2 sensor fuel pump monkeyed with timing Supposedly the last mechanic fixed the prom seating on the board New injector coil

how do you test out a mechanic if they truly understand the crossfire or not?

 

It wasn't a great system to start with, it wasn't in service very long. And few really cared enough to study the system. There are people on the forum that know alot about the system . I'm afraid I'm in the rip.it out group. Good luck.

 

5 mechanics? Ouch! Do you live in California, or somewhere that swapping to a carb (or Sniper EFI) is not an option? Adding where you live may generate some local garage recommendations.

PM @Buccaneer, or look for some posts by him.

 

Soo...What exactly is wrong with it? What is it doing or not doing? You MUST be real specific on the issues(s) for anyone to even come close to helping you. I think we can help, just please explain. Do you have a CEL light come ON? Thanks.

 

I just joined the forum a couple of weeks ago and I can tell you there is a lot of knowledge and helpful people here.
I recently bought a 1982 Collector Edition at a good price but the engine would run very rough and would almost die occasionally, but after 6 or 7 miles it was like someone flipped a switch and it would run great until it completely cooled down and then the cycle would repeat itself. The previous owner had the car looked at by a couple of mechanics with good reputations but they had no luck figuring out the problem. knowing nothing about the CFI I came to this forum and everyone that looked at my post offered advice to help me. The problem turned out to be the Cooling Temperature Sensor, after getting it replaced the car runs great.
I would follow what Buccaneer said and give them as much information as possible any little details you can think of will help. Hopefully in a short time the members will help you get your car running great.
Good Luck

 

Do you have a 6026 or 6430 ecm from a 84 corvette? What PROM did you use? Is it completely stock or has items been removed and replaced with aftermarket parts.....ie, air system, exhaust, egr, fuel pump......?

 

What are your mechanical skills? Do you have the tools, time, and ability to perform diagnostics and minor maintenance?

Do you have the 1982 Shop Service Manual? Not the little aftermarket ones, but the GM Factory Service Manual. Loads of diagnostic info in there.

There are several things you can check on the Cross-Fire system to help these guys diagnose your issue. Also, if it comes down to just trying parts, you can buy them yourself and change them much cheaper than paying a “mechanic” to just swap parts.

Mine was running poorly when I got it, but after I rebuilt the system and corrected one problem, it runs incredibly good now. Don’t give up on the CFI.

Example - you can pull the trouble codes with a small jumper wire and read the flashes. The plug is under the ashtray. I will have to look through the manual to recall which two to jump, so I don’t want to guess. Someone else may recall. That is a simple way to start.

Is the 2000 rpm an exact, consistent figure or does it change? There is a speed sensor that could be giving issues.

 

If I had to guess and ONLY a guess at this point for what you say at @2K, FP comes to mind and it's very low, but I could be wrong at this point. Do you know what the FP is at this point?

 

The above poster has no idea of what he speaks.

The CFI system on the 1982-1984 was a marvelous system. It went on to fuel MILLIONS of vehicles. I have the same system in my 1983.5 WS6 Trans-am. Camaros, Trucks etc..... It OVERNIGHT virtually DOUBLED the MPG of a Corvette. (700R4 was big contributor.)

Write to Buccaneer. I am surmising that nobody checked the fuel pressure. Also, when you mention the Engine wants to die over 2000RPM...HAS ANYBODY REPLACED THE FUEL FILTER????? (under rear of right front fender area.)

CFI is a marvel and FAR better than any carb. Any 'reputation' that CFI may have 'gleaned' was due to nobody taking the time to learn 'this newfangled' way of doing things. Mine is 38 years old and RUNS PERFECTLY and has had NO components replaced at any time. You can't say that with a carburetor.

I always kid around with someone who says something bad about CFI.
1. Have you ever owned one? NO
2. Do you know anyone that has had one that is running? NO
3. Where did you hear about CFI? (I read something on the internet!)

Unkahal

 

Actually I know more than you might think about it. It had lousy port sizing so it fell flat at about 3500 rpm and the reason some thought they were quick was because of the 700 r4 transmissions low first gear.
Yes I had one when it was new.chevy bought it back under the lemon law. The head instructor at the gym training center in fairfax virginia said they had their issues. He wasn't what you would call a fan. Im not either. Sorry to disagree.

 

I have had my CFI for a little over a year. It definitely needed some love when I got it, but that was just lack of PMI.

After cleaning, re-gasketing, rebuilt injectors, new IACs, new fuel filter, this 38-yr old car runs as smooth and strong as my other daily drivers 1/3 its age. It absolutely positively runs much better than my 1989 5.7Liter carbureted Mercruiser in my boat!

I have seen no macro-stats on recalls, unfixable problems, etc. But in my experience, it is possible to get it running great.

 

Here you go DWA...all the recalls associated with the 82 Corvette in it's ENTIRETY.

CFI RECALLS =ZERO,ZILCH,NADA,NIENTE.

But remember, my GYM teacher told me that he had a TRUCK........lol

https://www.corvsport.com/1982-c3-co...orvetteRecalls

 

I think it was the other way around, The 700R4 gearing, locking TC, and 2.78/2.87 rears are the main MPG champs of the 82 vette, the CF certainly improved the efficiency as opposed to a carb.... I own an 82, stock rear and trans with a 325HP crate with a large Holley and I'm amazed at the mileage if I keep my foot out of it-(I'm changing the rear..LOL). Highway is 23+ with TC unlocked.

For something said to be so good to only last a few years raises some questions in my mind, the L98 that replaced it produced more power and torque using TPI and if you were around in those days, less issues. The bad part about CF was the fact that it used electronics, early electronics were not as reliable as later devices. Finding someone who was familiar with them in the early 80s was rare, including Chevy dealerships, let alone your street garage. GMs build quality in general was horrible in the early 80s so producing an intricate for it's day injection system that was also reliable did not always happen, and you can forget decent customer service. If CF was easy to produce and maintain then it would have been profitable and GM would have stayed with it. It was a stopgap measure for DEP regs., that with a good manifold would have really produced good power and with better understanding it would of had a better reputation. I have spent my entire career being a mechanic of some sort and have learned that a device's reliability reputation is earned, not invented. In the 70s80s &, 90's I was a component level electronics tech amongst other things and I understand what was available then and electronics became much more reliable as time marched on. The reason you can't get a rebuilt CF ECM is that the board components are becoming extinct and that is not going to improve. While I have never owned a CF, I did own some Chevys produced in that era and I vividly remember troubleshooting codes in my 80 Camaro back in the day which had to be one of the worst cars ever produced,,,, and if I could find one just like it now I would buy it because it would not be my daily driver and I also understand the nostalgia folks have for some things...like me...

60

 

I hope the OP can get the answers he needs to fix his car.

>>>EDITED to remove unhelpfulness<<<

Here's what the comparison looked like 38 years ago.

 

I really don't like it when an OP starts a thread with an issue and then never re-posts anything, what's the point of the thread then?

Well, that's just flat out not true. There are newer electronics options for CFI if an ECM were to go out and you can not find a reliable replacement. One is from Dynamic EFI and also from Moates. I have run both systems over the 30 years I have owned my 82 and prefer the Dynamic EFI ECM system with my HAM board. Not only is the DEFI system good, but I have a base tune for a bone stock 82 vette that is about 98% good to go and would save someone a ton of tuning to get it there which makes the car totally drive-able and more reliable as far as ECMs go. The CFI system IMO is like the Energizer bunny...It keeps going and going when done right. .

OK, now where is the OP at with some input?

 

Thanks for the info!

 

The OP probably left and went to digital corvettes forum to ask his questions because we keep fighting like family over here!!!!
:-)
:-)

 

OMG! Well GL with that then. I was BANNED from DC because back when Dynamic Crossfire Solutions (DCS) was still a thing, I posted something in forum with a specific link to our site. However, it was to guide that person to the CORRECT info that we had put together on our site in the form of a PDF that was downloadable to fix his CF, NOT to sell the guy anything. I was banned right off the bat, not a warning or anything and it was forever. That's how messed up DC admins are. The funny part is that the owner of DC moved here to the Phoenix area and I went to a party at his house since he was with our corvette club. Talk about messed up! "Lucy! You got some splaining to do"...

 

I just went and checked the digital Corvettes website as I was not familiar with it, wow what a POS site especially c3 section. I will never go back there again. Keep up the good work on this site guys!!!

 

Like I said...we like family.
We bicker and bicker but stick together no matter what!!!