LT-5 motor issue

[rkreigh]

do a coolant system pressure check and I'm afraid you might find bad hg or certainly something dumping coolant into the engine which is no bueno.


I need to call Corey, I'd be a little surprised if he wouldn't work on the car.


Keep us posted!!

[Paul Workman]

Originally Posted by LGAFF

Injector housing bolts loose or gasket failure can pull coolant into the intake tract.

Myself and some others ran into a spate of that related to gasket failure. But, the gaskets from Jerry's Gaskets ended that fiasco! Never a problem since.

And, as a precaution, I use a little 3M gasket sealer around the coolant port between the head and the injector housing.

Finally, the bolts clamping the gaskets on both the intake manifold AND the injector housing, had a tendency to work loose. I learned this from someone on this site, and when I checked the torque on the IH bolts, sure enough they needed re-torquing. So, I put some BLUE Loctite on all of the threads before torquing down the IH or the intake plenum. The top of the motor hasn't been off in probably 8 years now - and no white smoke!

[jss06c6]

Jim's beautiful 1990 is back to full strength.. there were a number of issues, none of which were serious, but caused very poor performance. Quick list below..

1. Dead Coil
2. Fouled #4 plug
3. Badly leaking #4 primary injector
4. Leaking Injector Housing Gaskets
5. Leaking Secondary Vacuum Solenoid
6. Failed Secondary Injector Relay Module

All repaired and now strong again!20210104_142652.jpg20210122_114551.jpg20210122_114536.jpg20210122_114452.jpg20210106_135837.jpg20210105_100350.jpg

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[JimBobTX]

As a follow up to my original post, I wanted to report the final solution. I had the car hauled to Cross Flags Performance (Steve Schroder) and am extremely satisfied with the results. I would highly recommend Steve as a go to guy for performance issues, and probably any issue, as it relates to C-4's or especially our ZR-1's.

If interested I have posted below a brief history of my performance issue.

I purchased my ZR-1 at the Barrett-Jackson, Palm Beach, auction in the spring of 2018 and once I had it shipped home I discovered that in power mode the engine cut out and seemed to run on only some of the cylinders. Being dissatisfied with the performance I contacted the service manager at Corvette World in Houston. He told m that he was experienced with the LT-5 engine and could correct the problem. They had the car for 3 months and I was told that they tired a lot of different things, including new injectors and when I got the car back it didn't ruin any better than when I took it in. So for the past two years I just drove it occasionally with no expectation of being able to drive it in the Power Mode.

Earlier this month I took it to get gas and noticed a significant problem in performance and the engine seem to cut out or misfire in normal mode. After a few days I started the car again and this is when I noticed the white exhaust that had a faint odor of anti-freeze and posted my question about who to take the car to on this forum.

I took the car to Steve and he was able to fix all of my performance issues in the car. Unfortunately many parts for these cars are no longer manufactured, or even available anywhere, but Steve was able or either disassemble, and clean/repair, or locate used parts for what were needed to repair my car, and for that I am very pleased. If any one is interested interested in exactly what Steve had to do to correct my problems, I will leave it to Steve to explain the details.

All I can say for certain is that my problems were solved and I am extremely satisfied with the way the car performs, my interaction, and communications, with Steve during the repair and the ultimate cost of the work. I would highly recommend Steve for anyone needing help with the ZR-1.

[JimBobTX]

By the way, I want to thank everyone who posted their suggestions here. I would have not been aware of some of the problems that were suggested and I would not have found Steve if not for the posts here on this forum. Thanks again.

[jss06c6]

Originally Posted by JimBobTX

As a follow up to my original post, I wanted to report the final solution. I had the car hauled to Cross Flags Performance (Steve Schroder) and am extremely satisfied with the results. I would highly recommend Steve as a go to guy for performance issues, and probably any issue, as it relates to C-4's or especially our ZR-1's.

If interested I have posted below a brief history of my performance issue.

I purchased my ZR-1 at the Barrett-Jackson, Palm Beach, auction in the spring of 2018 and once I had it shipped home I discovered that in power mode the engine cut out and seemed to run on only some of the cylinders. Being dissatisfied with the performance I contacted the service manager at Corvette World in Houston. He told m that he was experienced with the LT-5 engine and could correct the problem. They had the car for 3 months and I was told that they tired a lot of different things, including new injectors and when I got the car back it didn't ruin any better than when I took it in. So for the past two years I just drove it occasionally with no expectation of being able to drive it in the Power Mode.

Earlier this month I took it to get gas and noticed a significant problem in performance and the engine seem to cut out or misfire in normal mode. After a few days I started the car again and this is when I noticed the white exhaust that had a faint odor of anti-freeze and posted my question about who to take the car to on this forum.

I took the car to Steve and he was able to fix all of my performance issues in the car. Unfortunately many parts for these cars are no longer manufactured, or even available anywhere, but Steve was able or either disassemble, and clean/repair, or locate used parts for what were needed to repair my car, and for that I am very pleased. If any one is interested interested in exactly what Steve had to do to correct my problems, I will leave it to Steve to explain the details.

All I can say for certain is that my problems were solved and I am extremely satisfied with the way the car performs, my interaction, and communications, with Steve during the repair and the ultimate cost of the work. I would highly recommend Steve for anyone needing help with the ZR-1.

Jim, that's very kind of you. It was a priviledge to help you with your ZR-1! I'm always here for you for anything you may need..

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