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Posts Made By:
Macroblock
Forum:
C4 ZR-1 Technical Postings
09-27-2020
Replies:
41
ECM Issues - No Start
Views:
5,281
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
Crank but no start
Views:
1,022
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
93 Starter Not Engaging
Views:
11,241
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Ruff Idle ,Huge Loss of Power
Views:
18,027
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
Long cranking
Views:
7,361
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
Fans on when ignition in accessory position
Views:
1,523
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
Fans on when ignition in accessory position
Views:
1,523
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
Test injector pulse
Views:
592
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
ECM Issues - No Start
Views:
5,281
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
ECM Issues - No Start
Views:
5,281
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
ECM Issues - No Start
Views:
5,281
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
ECM Issues - No Start
Views:
5,281
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
ECM Issues - No Start
Views:
5,281
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
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