TFI Ignition RPM reading, but no spark.

[Matt Cramer]

Do you have a data log of the weird dwell behavior? If so, please post it, along with an MSQ.

[sgsracing]

Matt,

Here is the MSQ and datalog, I am going to give bypassing the SPOUT, and driving the coil directly next.

[Matt Cramer]

Cranking dwell can be really long - Lance just posted an explanation of why here:

viewtopic.php?f=89&t=34028

[sgsracing]

Hello,

Happy holidays! I have changed a few things to approch driving the coild directly. I have IGBTIN to JS10, IGBTOUT to IGN,

MEGA TUNE PARAMATERS,

Coil charge scheme: STANDARD COIL CHARGE
Spark output: GOING HIGH INVERTED

The high current driver circuit is installed and Pin 36 is wired to my coils NEG terminal. I have no spark. I still have a RPM reading through my Hall sensor in my TFI modual. Is there any way that I can Test my Ignition output circuit to resolve my issues as I am thinking that MS-II is not firing my coil. Thanks againg for your time!

[Matt Cramer]

If you put it on a Stimulator, does the IGN LED blink?

[sgsracing]

Hello,

I have a V2 Stim so I needed to do a mod so I can see the IGN pulses as per the modification to the stim in the V3 assembly instructions. The IGN LED does NOT fire on the stim. I am assuming this is a problem with my MS-II output circuitry?

[sgsracing]

Dear Matt,

Well I took a look a the output circuitry as this was really starting to get on my nerves, and there appeared to be what looked like an "awkward connection" Beetween my Processor socket and my MS-II Board, I filled the connection with a small peice of wire and a little more solder and the Stim light worked! So Into the truck it when and I have lots of spark! Thank you for being ever so patient! I would never have found the problem if I didnt do the Stim mod! I would also be still blaming my TFI modual!! Happy New year as well!

Noah!

[Matt Cramer]

Congratulations on getting it working.

[lilsquirt2]

pretty much the same scenario as previous post concerning high current ignition driver, no spark;
tuner studio shows rpm via tach shielded wire when hall sensor dizzy is spun with a drill but no coil spark when relay board s5 goes to coil negative,
also the stimulator ig led doesn't show any response from any dial,
all parts on the 3.57 board associated with step 65 appear ok, are there instructions anywhere showing how to test these various parts and circuits or must it be sent back to the factory for this kind of repair?
are the v3.0 boards easier to diagnose and repair than the 3.57 boards?
what could cause this high current ignition driver circuit to quit?
to help answer;
this 3.57 board was used on 5 minutes for bench testing the injectors and ignition setup before installing on engine where it started the engine but ran less than ten seconds and failed to produce a spark after that,
there is no wiring harness to speak of on this race car,
the ms2 v3.57 plugs into the ms relay board,
everything is grounded to the relay board and the relay board is grounded to the battery,
the relay board positive and positive switch wire go to the start key switch which gets its power via a 10 amp fuse,
the dizzy and coil get power through the relay board,
thanks in advance for any and all help,
kevin

[lilsquirt2]

regarding the non-functioning current driver some more forum digging revealed a basic ecu voltage test that matt prescribed, the results are:
megstim 2.21 not attached to ecu;
pin #33 = 10v, pin #29 = 12.7v,
ms2 3.57 attached to megastim;
q9, q12, s12 = 10.3v, s12 = 9.9v,
u5, d9, u5, d19 = 5v,
pin 1 = 0v, pin 20 = 2.6v, pin 31 = 9.3 v,
the test instruction appear to indicate pin reading should be 5v, do my pin reading help explain why the high current driver isn't telling the coil to create a spark?
is the 3.57 board repairable by an ametuer or must it be sent to a profesional?
thanks,
kevin

[Matt Cramer]

pretty much the same scenario as previous post concerning high current ignition driver, no spark;
tuner studio shows rpm via tach shielded wire when hall sensor dizzy is spun with a drill but no coil spark when relay board s5 goes to coil negative,
also the stimulator ig led doesn't show any response from any dial,
all parts on the 3.57 board associated with step 65 appear ok, are there instructions anywhere showing how to test these various parts and circuits or must it be sent back to the factory for this kind of repair?
are the v3.0 boards easier to diagnose and repair than the 3.57 boards?
what could cause this high current ignition driver circuit to quit?
to help answer;
this 3.57 board was used on 5 minutes for bench testing the injectors and ignition setup before installing on engine where it started the engine but ran less than ten seconds and failed to produce a spark after that,
there is no wiring harness to speak of on this race car,
the ms2 v3.57 plugs into the ms relay board,
everything is grounded to the relay board and the relay board is grounded to the battery,
the relay board positive and positive switch wire go to the start key switch which gets its power via a 10 amp fuse,
the dizzy and coil get power through the relay board,
thanks in advance for any and all help,
kevin

Do you get spark when you disconnect the SPOUT connector?

[kieranl]

Matt,
I have CCD TFI module like you mentioned on page 1. How do wire this up to my distributor/Megasuiqrt II V3.0 if i have done the TFI mod and my TFI CCD module doesn't have the 3 connections for the distributor at one end?
The things that have thrown me are that the PIP is an IN (pin 6) and in stead of STRT on pin 4 I have IDM out.
Some help would be great!
Thanks
KIeran

[Matt Cramer]

Don't connect the start wire, and use dwell control instead of fixed duty.