Whats wrong? bad misfires, jumpy tach
10-14-2006, 01:23 PM
#31
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Join Date: Feb 2003
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Re: Whats wrong? bad misfires, jumpy tach
Originally Posted by Dmc1
Hey Jd. what do you think about my jumpy tach problem. Would putting a capacitor in the line work like some were saying? It can't be the ignitor because I can put the stock coil back and it's fine.
The tach output from the ignitor is a synthesized output originating from the ignitor - it is a different circuit from the one that drives the coil, but once it goes power flows differently in the ginitor and it typically takes a complete ---- within 5-10K miles, sometimes less.
You either have ignitor problem or loose/shoddy thermostat housing ground.
10-14-2006, 06:31 PM
#32
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Re: Whats wrong? bad misfires, jumpy tach
Thanks for the advice man. I guess I'll swap it out and see what happens. I saw something about it in the wiki about removing the ignitor when you have an msd or crane ignition. But I didn't really understand it.
http://www.pgmfi.org/twiki/bin/view/...torReplacement
http://www.pgmfi.org/twiki/bin/view/...torReplacement
10-14-2006, 07:18 PM
#33
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Re: Whats wrong? bad misfires, jumpy tach
Yah, you run that circuit when you are a stupid ------- ***** and waste money on an MSD box, and want to save yourself from the embarrassment of continual igniter failure. It still doesn't address the fact that the MSD box itself is known to fail, or that the MSD box gives *zero* performance increase, although significant power losses due to MSD boxes have been documented, but since MSD warranties their miscegenated product for life ****** buy them and are happy.
10-14-2006, 08:33 PM
#35
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Re: Whats wrong? bad misfires, jumpy tach
Originally Posted by Joseph Davis
Yah, you run that circuit when you are a stupid ------- ***** and waste money on an MSD box, and want to save yourself from the embarrassment of continual igniter failure. It still doesn't address the fact that the MSD box itself is known to fail, or that the MSD box gives *zero* performance increase, although significant power losses due to MSD boxes have been documented, but since MSD warranties their miscegenated product for life ****** buy them and are happy.
in a nice vat 'o aids
10-14-2006, 11:47 PM
#36
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Join Date: Feb 2003
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Re: Whats wrong? bad misfires, jumpy tach
Most of the HT Tuenarboi crew are douches, but do a post history search from Tony Palo, John @ LHT in Tampa, or Jeff Evans. All of those guys know their ---- and say stock Honduh ignition until 400, Blaster coil to 500, and then they push COP or raised voltage on primary windings. There have been several dyno charts documenting power losses of 40 whp at 400 whp level. I've pushed 500 on stock coil, plugs die every cold warmup due to glazing, but no need for an MSD in my experience. There are plenty of useful things I could buy with MSD money, Holmes. 
Regardless, it's common sense if you've basic digital under your belt. Ignition output signal timing is pretty ------- molested, between distributor sensors --> ECU where the ECU converts analog to digital signal at some undisclosed point on the sine wave --> igniter --> MSD intercepts igniter output and proceeds to recalculate what it wants to do with the timing based on "need" for multiple spark bullshit --> coil.
Regardless, it's common sense if you've basic digital under your belt. Ignition output signal timing is pretty ------- molested, between distributor sensors --> ECU where the ECU converts analog to digital signal at some undisclosed point on the sine wave --> igniter --> MSD intercepts igniter output and proceeds to recalculate what it wants to do with the timing based on "need" for multiple spark bullshit --> coil.
11-01-2006, 03:48 PM
#37
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Re: Whats wrong? bad misfires, jumpy tach
Originally Posted by Joseph Davis
Stock coil has nothing to do with ignitor.
The tach output from the ignitor is a synthesized output originating from the ignitor - it is a different circuit from the one that drives the coil, but once it goes power flows differently in the ginitor and it typically takes a complete ---- within 5-10K miles, sometimes less.
You either have ignitor problem or loose/shoddy thermostat housing ground.
The tach output from the ignitor is a synthesized output originating from the ignitor - it is a different circuit from the one that drives the coil, but once it goes power flows differently in the ginitor and it typically takes a complete ---- within 5-10K miles, sometimes less.
You either have ignitor problem or loose/shoddy thermostat housing ground.
I grabbed an ignitor from the junkyard today and switched it out with the one on the car. The tach is fine now it's perfect! I guess it was the ignitor all along.
11-01-2006, 09:21 PM
#38
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Join Date: Feb 2003
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Re: Whats wrong? bad misfires, jumpy tach
Eh, I'm merely a good mechanic, decent electronics hobbyist, and a solid observer. Exposure to three guys in my circle who are either ex-dealer techs or were raised by one, and the occaisional 4 am drunk as a skunk discussion with Blundell on Honduh ignition logistics with an eye to fitting something radically different in the stock components' place, and being an old crusty ---- kinda cement the deal.
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