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Old 12-02-2010, 08:46 AM   #61
michaeld
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Default Re: Took car to the dyno... Need help troubleshooting

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MSD has had a lot of problems with the 8261 in the last 18 months,, I lost a round of competition cause the new {2 passes} 8261 went bad {miss fire under load, like it on the rev limiter} have been replacing them with the big red Mallory coil. Car seems to rev higher with the Mallery than it ever did with a 8261 coils....
In fact between me and a couple customers of mine we have 3 8261 coils that I would like to return,, $162.00 each,, I was especially pissed when I lost first round due to coil failure. I`m on the msd mvp program,, guess I should call them and see what happens,, hate returning stuff but these things add up...
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Old 12-02-2010, 07:14 PM   #62
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Default Re: Took car to the dyno... Need help troubleshooting

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In fact between me and a couple customers of mine we have 3 8261 coils that I would like to return,, $162.00 each,, I was especially pissed when I lost first round due to coil failure. I`m on the msd mvp program,, guess I should call them and see what happens,, hate returning stuff but these things add up...
Being a guy with one coil...what can I do to test it?
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Old 12-02-2010, 08:14 PM   #63
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Default Re: Took car to the dyno... Need help troubleshooting

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Being a guy with one coil...what can I do to test it?



Get one of these for $7.60, plug it in and see if it makes any difference.

http://cgi.ebay.com/ebaymotors/Ignition-Coil-Ford-Mazda-Mercury-Lincoln-FD478-/330441908796?pt=Motors_Car_Truck_Parts_Accessories &hash=item4cefdf623c

Or, you could pay twice as much for it here,

http://cgi.ebay.com/ebaymotors/NEW-I...item255efbcafb

at $14.75 it must be twice as good……..LOLOLOLOL….twice as many volts....BWAAHHAAHHAAAA......


Or here, for 20 bucks……

http://www.napaonline.com/Search/Detail.aspx?R=MPEIC24SB_0150094660

Seriously, for troubleshooting, any other (known good) coil will do.
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Old 12-04-2010, 01:35 PM   #64
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Default Re: Took car to the dyno... Need help troubleshooting

Ohm tested my wires...

----- COIL (323) -----
8 [780] ------ 7 [814]
6 [906] ------ 5 [853]
4 [1208] ---- 3 [1056]
2 [1347] ---- 1 [1175]
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5.02 @ 147 on 26x8.5's (Vid)
4.79 @ 151 on 275's (Vid)


Vortech Superchargers
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dad's Custom Tanks
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Old 12-04-2010, 04:37 PM   #65
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Default Re: Took car to the dyno... Need help troubleshooting

The numbers are normal. Longer = more resistance.
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Old 12-04-2010, 06:07 PM   #66
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Default Re: Took car to the dyno... Need help troubleshooting

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Originally Posted by 67AfroMaro View Post
Ohm tested my wires...

----- COIL (323) -----
8 [780] ------ 7 [814]
6 [906] ------ 5 [853]
4 [1208] ---- 3 [1056]
2 [1347] ---- 1 [1175]

By chance are they msd wires? Did you shake them as you thested them? sometimes the crimp on the spark plug end is loose...
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Old 12-06-2010, 06:30 AM   #67
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Default Re: Took car to the dyno... Need help troubleshooting

did you ever try swapping the injectors to different holes and seeing if the problem changed holes?
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Old 12-06-2010, 10:00 AM   #68
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Default Re: Took car to the dyno... Need help troubleshooting

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By chance are they msd wires? Did you shake them as you thested them? sometimes the crimp on the spark plug end is loose...
We had several problems with the MSD wires that have the multi-angle spark plug boots on them. This was on a BBC. Went-outside and took the wires off his F-250 which had the 45* angle boot we needed, threw them on the engine, and it was fine.

Now, these MSD wires were brand-new and went through two sets. Seems that when we made the bend in them the core broke. Was hard to find with a voltmeter since it was intermittent. These were pre-made, after that we made them ourselves.

We really couldn't see the misfire since it was a single turbo setup and the other cylinders really masked-out the problem.
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Old 12-06-2010, 12:58 PM   #69
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Default Re: Took car to the dyno... Need help troubleshooting

It was pointed out to me that negative correction was adding fuel. In the log, you can see the AFR is at 10.5 on a 11.8 target and is still adding 5%, this is the only thing I could find that was definitively wrong. I was told buy one person that this wouldn't cause the problem and told by the person that saw the issue, this is exactly what their problem was when they went to the dyno...

Going back to the dyno today. Other things I have done...

New plug wires.
Valve lash.
New plugs with tighter gap.
Flushed rails and injectors.
Shuffled injector location in rail.
Checked for boost leaks.
Bringing a spare coil.
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Engine is SOLD!

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1.17 60' on 275's and Leafs
5.02 @ 147 on 26x8.5's (Vid)
4.79 @ 151 on 275's (Vid)


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Old 12-06-2010, 05:05 PM   #70
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Default Re: Took car to the dyno... Need help troubleshooting

May the force be with you. Or...May you apply The Force to the dyno.
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Old 12-06-2010, 05:29 PM   #71
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Default Re: Took car to the dyno... Need help troubleshooting

Cam sync error enabled in the big stuff? Disable it and try it.
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Old 12-06-2010, 08:25 PM   #72
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Default Re: Took car to the dyno... Need help troubleshooting

Ok,, some times if the AFR is on the fat side and the timing a little on the low side the loaded engine will exhaust fire,, the O-2 "sees" fire as a lean condition and tries to add fuel.. If you are serious about tune and making power in a drag race application you should turn off the O-2,, {open loop} The O2 will still read for data and the target AFR table will still be use in algorithm to calculate fuel.. In a good running drag race engine the O-s simply reads history,, meaning by the time the O-2 reads what is in the exhaust and the ecu tries to "fix" the afr it is too late,, the engine speed, load, boost, has changed.. We never use the O-2 for anything other than data log,, we have always ran better with a good tune and the O-2 in open loop..... O-2 is a running down the road street car thing,, For what it is worth even most new cars go to open loop at wfo anyway..
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Old 12-06-2010, 08:32 PM   #73
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Default Re: Took car to the dyno... Need help troubleshooting

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Originally Posted by Mike Beck View Post
We had several problems with the MSD wires that have the multi-angle spark plug boots on them. This was on a BBC. Went-outside and took the wires off his F-250 which had the 45* angle boot we needed, threw them on the engine, and it was fine.

Now, these MSD wires were brand-new and went through two sets. Seems that when we made the bend in them the core broke. Was hard to find with a voltmeter since it was intermittent. These were pre-made, after that we made them ourselves.

We really couldn't see the misfire since it was a single turbo setup and the other cylinders really masked-out the problem.
I have had many problems with msd wires on a multitude of cars for years now,, Most of the time the problem isn`t obvious unless the car is equipped with egt`s on every cylinder.. The cars would launch on all the candles then loose one shortly into the run,then go across the finish with all candles lite.... When someone brings me a car for tune and it has msd wires the first thing we do is change them to Moroso.. Just not worth having this problem...
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Old 12-06-2010, 08:38 PM   #74
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Default Re: Took car to the dyno... Need help troubleshooting

The way they (MSD) crimp the conductor to the terminals with the separate crimp instead of folding it back over the insulation causes the little spiral wire to break.
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Old 12-06-2010, 08:43 PM   #75
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Default Re: Took car to the dyno... Need help troubleshooting

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The way they (MSD) crimp the conductor to the terminals with the separate crimp instead of folding it back over the insulation causes the little spiral wire to break.
Exacly,, and if it isn`t broken it is loose in the crimp... It is hard as hell to take the plug boot off the wire but when you do you can see what we are referring to..
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