I still am not 100 % that this company (Module Experts) is really A rated. They have allot of negative feedback from customers on the better business website. I have no reason to question their diagnosis presently. I am waiting for my non- rebuildable unit to be returned. I sent mine with the Knock Sensor and cover with the unit. We will hope that I get those items back?

 

just went through all the same aggravation.removed my ecm sent it out to be diagnosed and repaired. reinstalled it. same results. after doing everything i could (and absolutely no luck with shops in the beadenton florida area ) i relented found a shop 35 miles from home in pinellas park that works on vettes and cadillacs only and had it towed rather than chance a breakdown (roadside assistance from rv road help - free tow). they got back to me a few hrs later, there are issues with the ecm. needless to say i'll b disputing the charge from the guy i sent it to. the beauty of this shop -36000 mi 3yr warranty on all work performed. i had originally pulled codes and changed my o2 sensors and tps and cleared all codes. but she still ran like crap(39000 miles on it)
im old old school points, condenser, dwell meter
and timing light i had a 69 big block roadster that could be tuned in an hour


then and now

 

Beautiful car!!!! Thank you for the pictures.

Coincidentally I am presently in Sarasota Florida working a house with my son. Sounds like your 94 had the same problems as mine? After several months of diagnosis, replacing allot of parts and taking allot of heat from this forum I decided to send out my PCM for rebuild. All indicators seem to point to the PCM as the problem. It was sent to Module Experts in Jacksonville Florida. They called me this week to tell me my PCM could not be rebuilt and I was right with my diagnosis. I felt pretty good at that point. The only problem I had with that was they offered very quickly to send me a rebuilt one for over a thousand dollars. When I said no way my salesman (Mark) became very quick with me. They did send it back and I received it yesterday but there was no paperwork with it. No diagnosis and no receipt of charges. I had a feeling I was being scammed for the high cost of another unit! However I sent an e-mail to
the company late last night and they responded quickly. I should get my paperwork and a receipt today. I feel a bit better..... but how do I know my unit is truly bad and can not be rebuilt? Should I get a second opinion? I have two PCM presently, the original and a rebuilt one I purchased from O'Riely auto parts. The rebuilt one does not work in the car, I already tried several times. It started the first but did not run any better, after that the car would not even start! So now here I am, what direction do I go?

My thoughts are to send both units out to another repair facility that flashes the PCM. Have them confirm the diagnosis first and if it is truly bad flash my rebuilt one to me VIN#. This car is a base coupe but is in great original condition. I am determined to fix it (within a reasonable cost). Thank you for your response it is appreciated!

 

Where is the shop located in Panella Park?

 

Zip Corvette offers reman services, they ARE REPUTABLE

https://www.zip-corvette.com/84-96-c...dules-ecm.html

 

hi richard, the shop is located at 6331 39th st north
pinellas park r and b auto service. 5 star rated across the board. had a hand full of vettes there when i arrived. jump on line for the phone number or you can call iggy @ 786 356 8415 . hes in miami and has been selling used parts for years. hes a straight shooter if it doesn't work he'll take it back.. i got a bose main amp from him that was ng, called him he said send it back i'll refund your card, and he did. i think when i get mine squared away i'll sell the car and move to an early c7. something that can b hooked up to a modern scanner and diagnosed instantly. i put a ton of dough in mine to get it where it is but i want to drive it not tinker with it.
new top and weather stripping,fixed the bose gold radio. i'm a purist 'm not about to devalue my car with a non matching radio.
installed new seat bladders, oem power antenna, brandy new OEM door panels (got em online 500 a piece) the after markets suck and are more dough.
did the opti,coil,water pump, plugs, wires and mufflers. new rubber, front brakes and rotors.
the car is near perfect until 3 weeks ago when all this started. have u jumped the ob port with a paper clip to check for codes? at the onset mine pulled h22 h53 and h64. i replaced my tps and o2 sensors
and it made a huge difference. i pulled a couple of plugs and decided to replace them all 8 were carbon fouled
ive had 11 vettes, 7 of them c4's 3 of which i bought new in 84,85 and 86. never had issues with any of them. changed the oil and drove em.
if u know any one interested in a true 40th anniversary it can b had for 15 grand plus whatever this repair cost. i just hit 70 so i wanna play not work. i plan on poppin the clutch to my grave



forgot to mention new cluch kit

 

Thank you for your time and the great information. I do not know how many corvettes I have owned? I am 69 and have been buying and selling vettes all my life. I started with a 1955 Cadillac, to Model A's, to Mustangs. Got tired of the rust and wen to corvettes, little did I know they rust as well!!!! My favorite was a 1966 red convertible that eventually needed restoration, I bailed, too expensive! I now own a low mileage 2005 and my wife and I love it. However I am thinking of the C8. I saw several in Carlisle and I like it. If I trade in the 2005 and the 1994 I will have a good down payment. We will see? I just received my diagnosis from the rebuild company. They charged me 150 for the diagnosis and I am ok with that. The bad part was the CPU ( Central Processing Unit) and they say it can not be replaced. I received this information from Darrell from Module Experts and I am happy with everything that he was able to do! So on to the quest to replace the PCM!

 

To say I have a tremendous amount of respect for some of the members here in this forum would be an understatement. There are some really smart and talented guys here on this message board who go out of the way to help people. I respect and admire that.

That being said.

You fckers are eating major crow on this one

Y'all treated this man like a noob and he was right, all along.

 

agent eran what are you some sort of an a$$
apparantly so.
heres a couple of my restos from 80's
and a super car from the early 90s of which i had many. i'd love to c u under the hood of that v12. you'd be dumbfounded


not like we dont know what time it is. our era was points coil condenser and dwell meter

 

I'm genuinely confused here. I have no idea what ur response has to do with the sentiments in my post.. really scratching my head here.

 

It is not fixed yet!

According to the diagnosis from Module Experts I have a shorted CPU (central processing unit) I had to research what that meant, in the PCM that can not be repaired. I purchased a rebuilt unit from O'Rielly auto parts for under 100 dollars. The unit needs to be programmed to my Vin# to work. I have a choice to send it out to have it benched flashed or take the car to my local GM dealer. The cost is about the same. If I can get the car running I think I will take it to GM?

I can take the abuse on this web site. For heavens sake, I am a retired Coach and PE teacher working on vettes! This forum has helped me so many times in the past. I do however have a FSM for sale that I did not want to buy!!!!!

Rich Harris

 

I don't think that's an accurate characterization of the recommendations in this thread. Some folks recommended following a logical and/or factory-specified troubleshooting procedure before blindly throwing parts at a problem. And I remind that in the first post, the OP said he'd tried a different computer in the car and it still ran the same way (reflashed or not, if the car runs identically with the replacement PCM then it probably isn't the PCM causing the problem). I would be highly suspect of any diagnosis from a shop that told him his PCM was bad, could not be rebuilt, and offered to sell a rebuilt one for $1100. It sounds fishy to the OP, and it does to the rest of us, too.

Basically, at this point the OP doesn't know any more about the problem than when he started. Nobody here has said it definitely isn't the PCM. We're just saying that's less likely than any one of a number sensors or wiring faults. It doesn't sound like a typical PCM-gone-bad set of symptoms. Tom pointed out that he has some DTCs, and a couple of us suggested data-logging to see what the PCM sees when it enters open-loop operation. No info to date contradicts that advice. Again, that doesn't mean that we think the PCM can't be the problem - just that it's not the most likely suspect.

The OP has already probably spent at least $300 for another (non-flashed) PCM and for "diagnostic services" from the fishy shop in FL, maybe more. Depending on how much it costs, at this point it may actually make sense to get that O'Reilly PCM flashed for his car and to try it out. For example, if it's only $100 to get it programmed correctly, that's worth maybe two hours of the OP's own time or only one hour of a shop's time. I have no idea how much people charge for a bench flash, but the dealership is probably going to be prohibitive if they even still have the equipment to do it on a 94.

To the OP: with the original PCM in the car, do the fans run constantly, regardless of coolant temp or a/c setting? If so, that is a sign that the PCM is faulty.

 

In the original post I believe I stated that the BCM was replaced by the former owner not the PCM. Sorry if that came across incorrectly. Early on the PCM was supposedly reprogrammed by a dealer by the former owner as well. The same result was observed. If the central processing unit was shorted the dealership could have missed it and charged the customer to program a bad PCM. All the parts on this vehicle have been tested and or replaced. The faulty PCM seems the most likely source of the problem. I am now on a short vacation, when I return I will address these issues. Yes the heater fan and the coolant fan constantly run.

I bought this corvette as a learning experience, I have achieved my goal! I learned not to do it again!!!! Love my C5 but looking at the C8!

Thanks all,
OP

 

Maybe I'm misreading your original post. You wrote, "I replaced the computer with a rebuilt computer from O' Reilly auto parts, however it was not flashed. It did not change the situation, the car acted the same way." I didn't see anything about the BCM/CCM, so I'm a bit confused.

I meant the cooling fans on the radiator. If those run constantly any time the key is in the "RUN" position, that is an indication that the PCM might actually be bad.

 

That was about halfway through this process but yes I have a rebuilt computer PCM from ORielly. It stared the car initially and then the car would not start. I am going to either send it away to get it flashed or use my local dealer. O'Rielly sold it with the fact that it needed to be flashed or programmed. I will get this in motion when I return home next week.

 

I am back from a short vacation and I am ready to continue the work on my 94 corvette. We just returned from a great corvette weekend at Ocean City NJ! It is called corvettes on the boardwalk and it is a wonderful day at the beach!

I received the bad PCM back from module experts. The diagnosis is a shorted (CPU) and can not be repaired. I put the unit back into the car and it acts the same. By disconnecting the map sensor it forces the car into open loop. The car runs great! I have the rebuilt PCM from O'Rielly auto parts. It needs to be flashed, programmed to my car. Since the car runs so well in open loop I am going to take it to my local dealer for programming. I was quoted 159 for this service? I will be making an appointment tomorrow.

TO BE CONTINUED!

 

hi rich, i solved the problem with mine. i bought an 03 red ragtop (my ruby is in the shop and i'll b selling it as soon as i get it back) what a difference
in power, ride and comfort. the car is in really

nice shape w/94000 pampered miles owned by the same guy fo 13 years. new top, magna flow ehaust, ac compressor and water pump. so after

owning 7 c4s i have entered a new world

plus its an automatic. i love sticks but in florida with all the traffic too much shifting

nice ride for 11 grand. i keep waitin for the cops to come arrest me for car theft 😁💪

 

not sure what the answer is. mine is in pinellas park at a corvette repair shop where they have sent the ecm out for diagnostics and repair/reprograming ??? who knows. i m not 100 percent sure but i think
Zip corvette parts sells them . i think you provide your vin and they set it up might b worth investigating. not mention your opti spark acting up
or o2 sensors causing poor idle and misfiring.(so i've read) i swapped mine with new ones along with the throttle position sensor all a waste of time and $.
just some more food for thought. check out your plugs see if they are carbon fouled. i changed mine
still running poorly. good luck if all else fails r&b auto service in pinellas park ( vettes and caddies only) if ur still in sarasota

 

An update on this repair. The dealer quote was a bit off as I expected. The 159 dollar quote quickly went to over 300 when I explained what needed to be done. As everyone knows dealer quotes usually do not go down. So I am sending my PCM out to be bench flashed through an ebay advertised service. So the cover goes on the car and I will forget about it for a few weeks waiting for the returned PCM.

 

Real nice car! I owned a 2000 convertible in the same color combination with a standard trans. I bought it in Maryland and enjoyed the car for a couple months. I bought it to sell, but I loved it! My wife does not like when I have more than one in her garage! I have a 2005 that my wife loves and we use quite often. This buying and selling thing I do on the side is a hobby. I really like to buy good corvettes drive them for awhile and sell them. Then I do it all over again. This 1994 corvette is a nice car with a big problem so I am stuck with it for now. The car has great paint, interior, tires and is a low mileage car so I am going to stick with it until it is fixed. It maybe the first car in awhile I loose money on but that is OK. I love these cars and want to pass on the joy of owning them to others. Sometimes you win and sometimes you loose, it is all part of the experience. It keeps life interesting!

I will keep all posted on the repair. Thank you!