Forum: C4 ZR-1 Technical Postings
2 Weeks Ago
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Replies: 5
Views: 648
Re: Priming Oil System?
You should not use the "flood clear mode", that is pedal to the floor while cranking the LT5 engine. Doing so may cause a huge backfire.
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 25
Views: 15,105
Re: Dreaded Upper Cam Chain Guide Failure
I have never seen a chain wear through a lower guide facing.
Other more likely sources of iron particles are the cams, lifters, and crankshaft. You probably inspected the cams and lifters when...
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 25
Views: 15,105
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Forum: C4 ZR-1 Parts For Sale / Wanted
04-03-2025
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Replies: 0
Views: 3,728
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Forum: C4 ZR-1 Technical Postings
04-02-2025
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Replies: 25
Views: 15,105
Re: Dreaded Upper Cam Chain Guide Failure
Here is some information about upper chain facings coming loose. Note that this article is from 2008. I have seen about four more failures since then. We have found them when we remove the cam the...
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Forum: C4 ZR-1 Technical Postings
11-12-2024
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Replies: 7
Views: 5,139
Re: Knocking sound and disconnected hose, Help!
You can use an ohm meter to test for a short circuit on a wire that is hidden. With the battery disconnected, each of the fuel injector drive circuits should measure 18 to 22 ohms to ground. A...
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Forum: C4 ZR-1 Technical Postings
11-11-2024
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Replies: 7
Views: 5,139
Re: Knocking sound and disconnected hose, Help!
From your overall detailed description of the running condition I wonder if a fuel injector wire is pinched under the plenum. The front primary fuel injectors on both banks are the most susceptible...
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Forum: C4 ZR-1 Technical Postings
09-23-2024
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Replies: 18
Views: 18,502
Re: Crank No-Start/Idle 91 ZR-1
The future of your ECM is not looking good. Maybe it has a poor internal connection. Have someone bang on the ECM with their hand while you are cranking the engine. Beyond that, try to find another...
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Forum: C4 ZR-1 Technical Postings
09-22-2024
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Replies: 18
Views: 18,502
Re: Crank No-Start/Idle 91 ZR-1
Try these two suggestions.
Is there a VATS lockout? With the door open and the ignition key off the Security light should be blinking. Close the door and try to start the engine. Is the Security...
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Forum: C4 ZR-1 Technical Postings
05-27-2024
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Replies: 15
Views: 23,565
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Forum: C4 ZR-1 Technical Postings
05-26-2024
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Replies: 15
Views: 23,565
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Forum: C4 ZR-1 Technical Postings
04-03-2024
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Replies: 22
Views: 10,238
Re: Continuing angst... headers today...
You are referring to a posting from a six years ago. The current version, made in the past four years or so, of Stainless Works headers does not interfere with the steering shaft. They currently make...
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Forum: C4 ZR-1 Technical Postings
06-27-2022
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Replies: 6
Views: 1,676
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Forum: C4 ZR-1 Technical Postings
04-03-2022
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Replies: 7
Views: 5,499
Re: What spark plug wires are these?
They are solid core wires. I recall that several sets were installed in a hotel parking lot at a BG Gathering in about 2005. Non-resistor BRU sparkplugs were also installed. The combination caused...
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Forum: C4 ZR-1 Technical Postings
09-12-2021
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Replies: 60
Views: 12,346
Re: New 3" Exhaust Installation
It's easy to control the valves with an RPM switch. Use Summit Racing PN SUM-830453. $50. Connect it to the B&B vacuum solenoid. Then you can set it to automatically open the valves at, let's say...
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Forum: C4 ZR-1 Technical Postings
08-09-2021
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Replies: 13
Views: 2,993
Re: DIC Bulb Location
The 'ABS Active' indication was first implemented in '91. It will turn on for a second during the pump self test when the car goes to about 8 mph following key on. In '91 a relay was added to drive...
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Forum: C4 ZR-1 Technical Postings
07-11-2021
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Replies: 33
Views: 6,170
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Forum: C4 ZR-1 Technical Postings
06-05-2021
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Replies: 7
Views: 1,386
Re: AC compressor question
Grounding pin C16 on the ECM will directly activate the compressor clutch relay. If the compressor runs, your problem is that the ECM is not receiving an "AC Request" signal.
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Forum: C4 ZR-1 Technical Postings
05-22-2021
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Replies: 8
Views: 7,304
Re: Diff fluid change
The C4 Corvette service manual does not specify a lubricant change interval for the differential.
Debris gets shed into the lubricant during the break-in period. I like to replace the lubricant...
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Forum: C4 ZR-1 Technical Postings
04-05-2021
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Replies: 10
Views: 2,576
Re: corsa exhaust
I'm not sure, but I believe that the right side flange was eliminated at the '92 1/2 model year point.
In my opinion, GM used the low restriction mufflers that they developed for the '92 LT1 as...
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Forum: C4 ZR-1 Technical Postings
04-04-2021
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Replies: 10
Views: 2,576
Re: corsa exhaust
'90 - '95 has a ball fitting on the left side.
'90 - '92 has a three bolt flange with a gasket on the right side.
'93 - '95 has a 2 3/4" slip fit on the right side.
A '93 - '95 exhaust system...
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Forum: C4 ZR-1 Technical Postings
03-28-2021
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Replies: 13
Views: 2,203
Re: Brake pump
In the US the Dorman master cylinder is available at RockAuto.com. I know that recently a ZR-1 owner in France was able to get parts from Rock Auto. Hopefully you can.
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Forum: C4 ZR-1 Technical Postings
03-27-2021
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Replies: 13
Views: 2,203
Re: Brake pump
Hi,
I have seen this several times. The master cylinder can transfer fluid from the front reservoir to the rear reservoir when there is an internal leak in the cylinder.
For replacement we use...
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Forum: C4 ZR-1 Technical Postings
03-14-2021
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Replies: 7
Views: 1,704
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Forum: C4 ZR-1 Technical Postings
02-15-2021
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Replies: 7
Views: 1,704
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