ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > Search Forums
Reload this Page Search Results
Register FAQ Calendar Today's Posts Search

Page 1 of 2 1 2
Showing results 1 to 25 of 38
Search took 0.01 seconds. Search: Posts Made By: Macroblock
Forum: C4 ZR-1 Technical Postings 09-27-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

Just an update to provide this link on troubleshooting the C4-ZR1-ECM:

http://zr1ecm.com/youfix.html
Forum: C4 ZR-1 Technical Postings 09-27-2020
Replies: 7
Views: 1,017
Posted By Macroblock
Re: Crank but no start

As the C4-ZR1's reach 30 years old, this is becoming a common issue. I prepared a few web pages that provide useful tips on how to diagnose a no-start issue.

http://zr1ecm.com/youfix.html
Forum: C4 ZR-1 Technical Postings 08-07-2020
Replies: 137
Views: 11,208
Posted By Macroblock
Re: 93 Starter Not Engaging

Just thought I would chime in for those experiencing strange starting issues.

Some years back I discovered the clutch-lock-out switch was troublesome by design.

The clutch switch forces the...
Forum: C4 ZR-1 Technical Postings 08-02-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

No sweat. Let us know how you make out.
Forum: C4 ZR-1 Technical Postings 08-01-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Tripler - it sounds like you narrowed it down to an ignition issue. Once you replace the coils and reassemble the plenum, you'll be able to test.

Coils that are not providing adequate voltage are...
Forum: C4 ZR-1 Technical Postings 07-31-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Awesome - Great Job!:thumbsup:
Forum: C4 ZR-1 Technical Postings 07-24-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Yes, good idea to change the ignition coils and perhaps the hi-tension leads while you have the plenum off.

The coils are all the same so if you want to test for the sake of testing you could...
Forum: C4 ZR-1 Technical Postings 07-23-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Yup sounds like it - unless the Hi-Tension lead going to #8 is the issue. Perhaps the lead is creating high resistance or shorting to ground.
Forum: C4 ZR-1 Technical Postings 07-22-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

To double check, start and run the engine with 5 and 8 disconnected. Connect 5 and note any changes in idle. Connect 8 and note any changes in idle.

If connecting 5 and 8 didn't have any...
Forum: C4 ZR-1 Technical Postings 07-22-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Tripler - sounds like cylinder #8 is off-line. Its waste-spark partner is cylinder #5, so try the test by removing that Hi-Tension lead to see if doing so has any affect.

If #5 and #8, together...
Forum: C4 ZR-1 Technical Postings 07-20-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

ZR2 and Tripler - We gotta do process of elimination to narrow it down.


ZR2 - If you suspect it is a plug issue, you might want to remove one plug wire at a time and run the engine to isolate...
Forum: C4 ZR-1 Technical Postings 07-18-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Sounds like a cylinder or two are off-line. Any fault codes?

Verfiy the ignition leads as detailed in this thread. Afterwards, you will need to verify your injectors and/or the (-) feed to the...
Forum: C4 ZR-1 Technical Postings 07-18-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Hmmm.....One cylinder could be off line due to fuel starvation. It could be an ECM issue since you've already changed the injectors.

After ruling out your ignition system by checking the...
Forum: C4 ZR-1 Technical Postings 07-18-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

To check plug wires:

Method 1 is to use an inline spark plug tester. Test one lead at a time. Connect one end to the incoming HI-Tension lead, the other to GND (normally the other lead goes to...
Forum: C4 ZR-1 Technical Postings 07-16-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

I'm interested in hearing the engine to determine if all 8 cylinders are firing.

Did you verify that each HI-TENSION lead is providing a signal to its matching plug?
For example, if one coil is...
Forum: C4 ZR-1 Technical Postings 07-14-2020
Replies: 170
Views: 17,976
Posted By Macroblock
Re: Ruff Idle ,Huge Loss of Power

Could you record some video/audio to demonstrate the symptoms you are experiencing?
Forum: C4 ZR-1 Technical Postings 07-09-2020
Replies: 31
Views: 7,341
Posted By Macroblock
Re: Long cranking

I didn't like the original factory start-up procedure because it takes far too many cranks before the engine starts. This is due to the ECM delaying fuel delivery.

When the engine is turning...
Forum: C4 ZR-1 Technical Postings 07-07-2020
Replies: 17
Views: 1,518
Posted By Macroblock
Primary Fan Runs When ignition in "ON" position

That's a good sign. It suggests to me the ECM is capable of controlling its (-) output to the primary fan relay on circuit 409, pin 6 of Green Connector (C6).

Could it be you have a Code 14, 15,...
Forum: C4 ZR-1 Technical Postings 07-06-2020
Replies: 17
Views: 1,518
Posted By Macroblock
Re: Fans on when ignition in accessory position

I'm thinking the primary cooling fan is "controlled by the ECM" thru the Green Connector "C6". This provides a (-) signal to th Primary Fan Relay.

If you disconnect the Green Connector and turn...
Forum: C4 ZR-1 Technical Postings 07-05-2020
Replies: 2
Views: 587
Posted By Macroblock
Re: Test injector pulse

It is possible to test your ECM's ability to activate the injectors with the plenum removed but if the Ignition Module is removed you will not get any injection pulses while cranking the engine over....
Forum: C4 ZR-1 Technical Postings 07-03-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

In actual fact, the ECM does not have an input for oil pressure. I guess it wasn't a consideration for software control back then.

I find the the LT5 pressurizes its oil very quickly when cold...
Forum: C4 ZR-1 Technical Postings 07-03-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

The stock ECM provides an injection delay of 1 or 2 seconds, which is not nearly enough time to prime oil into the LT5 engine. My inclination is that it would take closer to 30 seconds to prime and...
Forum: C4 ZR-1 Technical Postings 07-03-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

OK - Great. Likely over the winter.
Forum: C4 ZR-1 Technical Postings 07-02-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

At this point the single Arduino I installed directly to the Gates of the 8 Power Transistors can perform most of the ECM operations related to fuel management and ignition timing.

Ironically,...
Forum: C4 ZR-1 Technical Postings 07-01-2020
Replies: 41
Views: 5,272
Posted By Macroblock
Re: ECM Issues - No Start

UPDATE:

I didn't like the original factory start-up procedure because it took too many cranks before it started.

The firmware now monitors the coolant temperature sensor and engine RPM and...
Showing results 1 to 25 of 38
Page 1 of 2 1 2

 
Forum Jump

All times are GMT -4. The time now is 07:02 PM.

Contact Us - ZR-1 Net Registry - Archive - Privacy Statement - Top

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020