Broke down at C.O.T.A.

[rossgn49u]

Well, this sucks. Drove nearly 300 miles to attend the Corvette show at the Circuit of Americas. Just before getting to hotel, last night, 90 ZR-1 started spitting and bucking, then cleared up. Started up this morning, and it barely made it 6 miles to the track. Have CE light and shitish smoke. Car has 70k and have put 1500 miles on it in the last two months with no issues. Any ideas. Any recommendations on an Ausrin shop if I have to have this thing towed?

[billschroeder5842]

Since you have the CE light the first thing to do is pull the codes. Use the paperclip method, then look up the code on your phone. You are more than half way to fixing your problem.

[ram_g]

Posted reply on CF - probably the nearest ZR-1 specialist is Henderson Performance in New Braunfels, about 50 miles away.

[Ccmano]

Check the MAP sensor vacuum line at the back of the plenum. If it came off the car can exhibit these symptoms. Henderson is the closest. Also check with Steve at Crossed Flags Performance in Magnolia, but that's farther away.
H
:cheers:

[rossgn49u]

Just checked with Henderson. They no longer do mechanical repairs.

[ram_g]

Also check with Steve at Crossed Flags Performance in Magnolia, but that's farther away.
H
:cheers:

Yep, if Henderson isn't in that business any more, CFP is the next closest, ~140 miles. Unfortunately in the wrong direction from Wichita Falls!

[HAWAIIZR-1]

Just checked with Henderson. They no longer do mechanical repairs.



You can?t see the vacuum line from the top of the map sensor. You need to reach under to feel if it came off as CCMANO mention.


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[Ccmano]

The MAP sensor is under that rectangular aluminum plate. The vacuum line is on the bottom and connects to the back of the plenum.
H
:cheers:

[rossgn49u]

Well shoot! Didn't see your post until after the wrecker came. I was just looking for hoses on top. If that is all it is, hopefully Austin Corvette won't hit my wallet too hard. Towing company already raped me.

[rossgn49u]

Ccmano.....just noted your production number. Mine is #1466. Red/Black.

[Ccmano]

Ccmano.....just noted your production number. Mine is #1466. Red/Black.

Cool...:thumbsup: mine is Red/Black too. If Austin Corvette can't help you. Call Steve at Crossed Flags. He knows his way around an LT5.
Good luck!
Hans
:cheers:

[jss06c6]

Please tell the guys at Austin Corvette to call me (832) 748-1286 and I'll help as I can from here..

Steve Schroder
Crossed Flags Performance, LLC

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[rossgn49u]

Thanks Steve. Looks like Code 36. They are saying module or ecm.

[Ccmano]

While failure of the DIS or ECM units is certainly a possibility, the higher likelihood is an issue with a connector. That possibility should be eliminated before replacing these expensive and hard to get parts. Following the diagnostic procedures in the FSM is key here.
H


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[jss06c6]

Thanks Steve. Looks like Code 36. They are saying module or ecm.I'm away from the shop at the moment. Cam you call me on my cell?

832 748 1286

Steve

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[Ccmano]

Do yourself a favor and call Steve...

Keep in mind you can't just go to the dealer or parts store buy an ECM or DIS unit, plug it in and see if it solves the problem. Then, if it doesn't, return it an get your money back. Throwing parts at it to see what solves the problem can get expensive real fast! Each of those units will cost a minimum of $1000, if you can find one. The ECM can be rebuilt. Haibeck (www.ZR1Specialist.com) provides that service. The shop needs to do proper diagnostics, not just random parts replacement.

These cars with first generation computer system (OBD1) diagnostic codes will only point you in the general direction of the problem. They don't PinPoint the exact component that is failing. That's why the FSM diagnostic trees need to be followed to narrow it down.

Keep us posted on how this goes.
H

[rossgn49u]

ECM is $87.00 at Autozone and cheaper on Rockauto. Hope their pricing is correct.

[jss06c6]

You need a Tech 1 to diagnose.. there can and likely are more common failures that can cause your issue. Attached is the best I can do remotely. These are NOT common to L98/LT-1 platforms. They are unique to the LT-5.

See attached..134021340313404134051340613407

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[lfalzarano]

ECM is $87.00 at Autozone and cheaper on Rockauto. Hope their pricing is correct.



No way is that an LT5 ECM!


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[jss06c6]

Lou is absolutely correct. The LT-5 ECM and DIS are not available in the open market. You are very likely looking at an LT-1/4 remanufactured unit. Won't work.

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[Ccmano]

ECM is $87.00 at Autozone and cheaper on Rockauto. Hope their pricing is correct.

Not a chance.... you have to be very careful sourcing LT5 parts from most retail parts suppliers. More often than not those parts are not for an LT5. Most are clueless as to what an LT5 is and how different it is from an SBC. You have to know exactly what your looking for. That said, as long as your active in this community most parts can be sourced. As I said previously, an ECM or a DIS unit will be pricey.

Based on what I saw on your post in CF, looks like the Austin Corvette guys are reasonably competent and feel it may just be a connector issue.
H
:cheers:

[-=Jeff=-]

Rockauto has the WRONG ECM listed for the LT5, as do many of the automotive places (Autozone, Advance, etc)

[GOLDCYLON]

ECM is $87.00 at Autozone and cheaper on Rockauto. Hope their pricing is correct.

No way thats an LT5 ECM

[rossgn49u]

Update: Had car shipped back from Austin a couple weeks ago. Austin Corvette tried a few things including cleaning ignition module connector. Car ran ok for a few miles, afterward, but then started missing again. Decided to ship it home and see if I could sort it out on my own. I read a post that suggested re-seating the EEPROM. Removed ECU today, reseated EEPROM and re-seated ECU connectors. Took it out for a 10 mile road test and so far it's running like a champ. Will let it sit overnight and run it from a cold start tomorrow. Crossing my fingers!

[ram_g]

Hope that's what it was!!

[rossgn49u]

Well, after sitting overnight, started up this afternoon, and it's missing again.

[Corvette95]

Check your alternator connection - not just visually but remove and clean if you can, plus check your battery terminals and check your alternator with a DVM.

[32valvesftw]

Check your alternator connection - not just visually but remove and clean if you can, plus check your battery terminals and check your alternator with a DVM.
Probably a good idea to check your battery connections as well. First rule of troubleshooting, start with the easiest thing first.

[rossgn49u]

..ECU is back from repair. Started up fine and drove it 60 miles no issues. Have a SES light, but when I check codes, I only get a Code 12. Start it up and the SES light returns?

[rossgn49u]

Ok...ECU is on it's second trip back from G7 Computer Repair. Looks like the are calling it a software issue. We'll see. Don't expect to receive it until next week, though.

"The computer you sent here has been repaired. There was a software failure on the board, so the unit did not need to be opened (which is always better for it) because the hardware all tested OK. Software repairs typically take longer than hardware faults, so a lot of time was put into this unit. Usually when the computer fails, so does another part on the vehicle, and if all the damaged parts on the vehicle are not replaced at the same time, then the original problem may still exist, or even cause damage again to the computer (which is not covered under warranty, as stated in the Terms and Conditions on the website) and/ or vehicle. Anything electrically related to the symptoms with the vehicle should be checked. It could not be determined if the fault was a result of another problem with the vehicle or a manufacturer's defect because the vehicle was not here for inspection. Your computer was shipped back out within one business day after it arrived here (as stated in the Terms and Conditions, "one day" is defined as shipping out by the end of the following business day that the computer is received here from the customer)."
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