Hi,
Can My MS Controller Cause An Ignition Misfire? I'm Using MS2 V3 With 2.90500. Fuel Only. Tach Signal Off Coil Negative. Engine Won't Stay Running. Tracked The Problem Down To An Ignition Misfire Until It Dies. I Have Replaced Plugs, Wires, Cap, Rotor, Distributor Twice With New Ones And four Different Coils. Constant 12V+ To Coil. I Finally Ran A Jumper Wire Over To Another Car With An HEI Distributor And The Problem Went Away ( Did Not Seem Too Bother The Hei Ignition In The Second Car). The Problem Seems To Be The MS Controller Shorting Out The Coil. So I Bought A Second MS2 V3 With 2.92000, Same Problem. What Am I Doing Wrong? Tune? Configration? Jumpers On The Board For Tach Input?
A Datalog Does Not Show Anything Unusual, Just The RPM Tapering Down To 0.
Any Comments Or Suggestion Will Be Greatly Appeciated.
Thanks,
Dale
MS Causing Ignition Failure?
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
-
Loopershop
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Apr 13, 2013 8:57 am
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: MS Causing Ignition Failure?
Try a 20 to 24 volt zener diode in line with the coil negative wire, banded end to the coil. Usually I've recommended this for protecting the MegaSquirt from ignition noise, but it will also prevent the MegaSquirt from grounding the coil.
Re: MS Causing Ignition Failure?
The tach input circuit can be configured in a number of ways - which involves reading a multitude of notes. This is the one I use.Loopershop wrote:Hi,
Can My MS Controller Cause An Ignition Misfire? I'm Using MS2 V3 With 2.90500. Fuel Only. Tach Signal Off Coil Negative. Engine Won't Stay Running. Tracked The Problem Down To An Ignition Misfire Until It Dies. I Have Replaced Plugs, Wires, Cap, Rotor, Distributor Twice With New Ones And four Different Coils. Constant 12V+ To Coil. I Finally Ran A Jumper Wire Over To Another Car With An HEI Distributor And The Problem Went Away ( Did Not Seem Too Bother The Hei Ignition In The Second Car). The Problem Seems To Be The MS Controller Shorting Out The Coil. So I Bought A Second MS2 V3 With 2.92000, Same Problem. What Am I Doing Wrong? Tune? Configration? Jumpers On The Board For Tach Input?
A Datalog Does Not Show Anything Unusual, Just The RPM Tapering Down To 0.
Any Comments Or Suggestion Will Be Greatly Appeciated.
Thanks,
Dale
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
-
Loopershop
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Apr 13, 2013 8:57 am
Re: MS Causing Ignition Failure?
Hi,
I Installed A 24V Zener Into The Harness Early On Because I Was Having Tach Spikes During Cranking. I Tried Adding Another 22V Zener In Addition To The 24V, Did Not Seem To Help. I Also Tried Adding Increasingly Higher OHM Resistors Unlit MS No Longer Got A Tach Signal, Did Not Seem To Help.
trakkies - Both MS Controlers Are Assembled Like Your Diagram Except D2 Is The Supplied 22v Zener
I Don't Understand How MS Can Cause The Problem. I Installed An Inline Spark Tester (Looks Like A Flash Bulb), Spark Is Not Real Bright And Not Consistent Until The Engine Dies. When I Disconnect MS From The Coil And Jumper To Another Car, Both Car Idling, The Spark Is Very Bright And Smooth And Does Not Die. The Interesting Thing Is The Other Car Has An HEI, And MS Does Not Bother The HEI.
I've Tried A Pertronics Convertion And Points
Thanks,
Dale
I Installed A 24V Zener Into The Harness Early On Because I Was Having Tach Spikes During Cranking. I Tried Adding Another 22V Zener In Addition To The 24V, Did Not Seem To Help. I Also Tried Adding Increasingly Higher OHM Resistors Unlit MS No Longer Got A Tach Signal, Did Not Seem To Help.
trakkies - Both MS Controlers Are Assembled Like Your Diagram Except D2 Is The Supplied 22v Zener
I Don't Understand How MS Can Cause The Problem. I Installed An Inline Spark Tester (Looks Like A Flash Bulb), Spark Is Not Real Bright And Not Consistent Until The Engine Dies. When I Disconnect MS From The Coil And Jumper To Another Car, Both Car Idling, The Spark Is Very Bright And Smooth And Does Not Die. The Interesting Thing Is The Other Car Has An HEI, And MS Does Not Bother The HEI.
I've Tried A Pertronics Convertion And Points
Thanks,
Dale
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: MS Causing Ignition Failure?
If you spin the distributor with a drill instead of having it run on the engine, what does the spark do?
Do you have a data log of the problem? It may not be the MS interfering with the ECU.
Do you have a data log of the problem? It may not be the MS interfering with the ECU.