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MSD Streetfire No Start #2944943
07/19/21 08:43 PM
07/19/21 08:43 PM
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Indiana
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YO7_A66 Offline OP
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10 year old Streetfire #5520 ignition module with no start condition.

During CRANK: the LED light does not light up
Engine OFF/Key in the RUN position: the LED will glow a light red

RUN voltage at the MSD connection is 12+ volts
CRANK voltage at the MSD connection is 10.9/11.1v (9v min.)
So the module has voltage at both RUN and CRANK

Big RED battery voltage is 12v
Both coil wires tight on coil
Coil Wire to dist cap is tight on both ends
Dist wire (rubber connector) to MSD box is tight
Big neg wire is straight to the battery

Any suggestions?

Thanks


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2944978
07/19/21 09:54 PM
07/19/21 09:54 PM
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central texas
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krautrock Offline
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can't you test the box by shorting the two trigger wires (that come from yr dist) to the msd box. that LED light should light up each time you short it right?

Re: MSD Streetfire No Start [Re: krautrock] #2944981
07/19/21 10:02 PM
07/19/21 10:02 PM
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krautrock Offline
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CHECKING FOR SPARK

If triggering with the Magnetic Pickup:
1. Make sure the ignition switch is in the "Off" position.
2. Remove the coil wire from the distributor cap and set the terminal
approximately 1/2" from ground.
3. Disconnect the magnetic pickup wires from the distributor.
4. Turn the ignition to the On position. Do not crank the engine.
5. With a small jumper wire, short the magnetic pickup Green and Violet
wires together several times. Each time you break this short, a spark
should jump from the coil wire to ground (the LED should also blink). If
spark is present, the ignition is working properly. If there is no spark skip
to step 6.
6. If there is no spark:
A. Inspect all of the wiring.
B. Substitute another coil and repeat the test. If there is now spark, the coil is at fault.
C. If there is still no spark, check to make sure there is 12 volts on the small Red wire from the Street Fire Ignition
when the key is in the On position. If 12 volts is not present, find another switched 12 volt source and repeat
the test.
D. If, after following the test procedures and inspecting all of the wiring, there is still no spark, the Street Fire
Ignition is in need of repair. See the Warranty and Service section for information.

Re: MSD Streetfire No Start [Re: krautrock] #2945044
07/20/21 07:02 AM
07/20/21 07:02 AM
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YO7_A66 Offline OP
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Thank you Krautrock.
I may have time to go thru that list tonight up


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2945259
07/20/21 04:46 PM
07/20/21 04:46 PM
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central il.
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second 70 Offline
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Had a MSD 6AL box do the same thing and it was the battery. Read 12 volts just wouldn't fire. Just hook up a battery charger and see if it'll start. It fooled me and was as simple as a new battery.

Re: MSD Streetfire No Start [Re: krautrock] #2945316
07/20/21 07:24 PM
07/20/21 07:24 PM
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YO7_A66 Offline OP
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Second 70:
I have a new battery installed and my minimum voltage at crank is 10.9/11.0. The minimum for the Streetfire is 9v.
Thank you!

Krautrock:
Thanks for the instructions as they showed my box is still good after 10 years!! Huge spark out the coil wire when the dist wire/msd connection is jumped and the LED lit up too up

Now I am going to replace the distributor pickup and see what happens. But I have had to replace this pickup every 3-4 years or so in the past. They don't last long on my stuff.

Thank you!


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2945386
07/20/21 09:10 PM
07/20/21 09:10 PM
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central texas
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krautrock Offline
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Glad to hear your box is good, I have one on my truck and I didn't want to see that one went bad haha!!

Re: MSD Streetfire No Start [Re: krautrock] #2945469
07/21/21 08:24 AM
07/21/21 08:24 AM
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Western Md.
skicker Offline
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Originally Posted by krautrock
Glad to hear your box is good


Exactly...I have one in the Dart and one in the Duster...Probably be one in the Satellite too if I redo everything under the hood...


...FAFO...
Re: MSD Streetfire No Start [Re: YO7_A66] #2947278
07/26/21 11:34 AM
07/26/21 11:34 AM
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Update:

I purchased a new magnetic pickup and checked the resistance of this new one against the existing one in the distributor. I found the new one at .319 and the old one at .322. So I pulled the distributor and found the gap to be huge! I was able to drop an .020" feeler in between the pickup and the relucter with no problem. I didn't try and get an actual measurement but my guess was that it was probably .025" or more. I am surprised that it ran at all. The existing pickup had a lot of wear on the pickup (that sticks out beyond the coil) versus the new one out of the box.

I replaced the pickup and set the gap to .008 (non magnetic feeler) and I will get back on it tonight to see if this was the issue.

Thanks again!


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2947363
07/26/21 01:58 PM
07/26/21 01:58 PM
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moparx Offline
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a gap that large will cause issues for sure.
beer

Re: MSD Streetfire No Start [Re: moparx] #2947523
07/26/21 08:37 PM
07/26/21 08:37 PM
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YO7_A66 Offline OP
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It fired right up 👍


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2947527
07/26/21 08:46 PM
07/26/21 08:46 PM
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Omaha Ne
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TJP Offline
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Quote
The existing pickup had a lot of wear on the pickup (that sticks out beyond the coil) versus the new one out of the box.


Glad you got it fixed. My concern would be how did that wear occur? Might want to check your distributor shaft side play or vacuum advance plate slop if you're running one. beer

Re: MSD Streetfire No Start [Re: TJP] #2947533
07/26/21 09:06 PM
07/26/21 09:06 PM
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""My concern would be how did that wear occur?""

Mine too! Nothing was loose (magnetic pickup, plate, or the relucter) So that one has me wondering.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: MSD Streetfire No Start [Re: YO7_A66] #2947544
07/26/21 09:20 PM
07/26/21 09:20 PM
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Sniper Offline
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Originally Posted by YO7_A66
""My concern would be how did that wear occur?""

Mine too! Nothing was loose (magnetic pickup, plate, or the relucter) So that one has me wondering.


If you have vacuum advance, did you apply vacuum and observe the pickup clearance throughout the range of movement? Sometime that will cause the clearance to go away.

Re: MSD Streetfire No Start [Re: Sniper] #2947554
07/26/21 09:29 PM
07/26/21 09:29 PM
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This is an old FBO distributor that had the vacuum plate welded up.
Thanks

Re: MSD Streetfire No Start [Re: YO7_A66] #2947741
07/27/21 11:17 AM
07/27/21 11:17 AM
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Omaha Ne
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TJP Offline
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Originally Posted by YO7_A66
This is an old FBO distributor that had the vacuum plate welded up.
Thanks

With that information the only other possibility would be your distributor shaft side play (worn bushings), a bent shaft or out of round reluctor. I would check them and if OK shruggy beer







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