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Cranks but doesn't start, runs fine on stock ECU. MS3x, unshielded wires?

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Old 11-02-2016, 08:44 AM
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warm and fuzzy feelings in this thread
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Old 11-03-2016, 12:03 AM
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Here it is finally put together, for some reason the MAP sensor didn't line up with the hole on the case so I had to drill it out. Getting those screws threaded was a damn mission, had to add washers to two...

It doesn't look perfect, but my little buddy approves!

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Old 11-03-2016, 08:35 AM
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did you put the map sensor on upside-down, or on the wrong side of the board or something? that doesnt make any sense.
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Old 11-03-2016, 09:27 AM
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Damnit, its on the right side of the board, but it has to be upside-down. I wasn't getting proper ambient pressure readings either, which I thought was sensor calibration, now I know. Flat side should face away from PCB... hopefully I'm running out of **** ups at this point
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Old 11-03-2016, 09:54 AM
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there's a little hole in the bottom of the MAP Sensor, yours is probably facing up now...

the notched lead should also fit into the square hole--where the rest are round holes.
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Old 11-03-2016, 11:15 AM
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Yep, didn't notice the notched lead, and yea looking at the pics I took it has the little hole facing away from PCB. Gotta fix that tonight. Thanks!
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Old 11-03-2016, 11:21 AM
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Originally Posted by soaps42
[...]Getting those screws threaded was a damn mission, had to add washers to two... [...]
I assembled 3 MS3s now and you're right- those screws are the worst part. I usually pre-thread the holes with some 'sacrificial' sheet-metal screws of the same size. They're sacrificial because after using them for a few holes, their heads get all mangled from exerting a lot force with the screwdriver.
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Old 11-03-2016, 11:27 AM
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Originally Posted by stefanst
I assembled 3 MS3s now and you're right- those screws are the worst part. I usually pre-thread the holes with some 'sacrificial' sheet-metal screws of the same size. They're sacrificial because after using them for a few holes, their heads get all mangled from exerting a lot force with the screwdriver.
I've complained numerous times to DIY and they said I'm the only one with issues. Glad to see im not the only one.


I use #4 sheet metal screws from lowes that are stronger than the black ones to first drive in, then I'll replace with black screws. otherwise I've snapped way too many black screws in cases.

I can snap the black ones by hand hold each side with a wrench and twisting. I cant with the silver ones...



the cases didnt used to be this tight. it was never an issue before -- but now it's my least favorite part of building ms3xes.
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Old 11-03-2016, 11:29 AM
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I've had numerous issues with the screws as well. Surprisingly, when I switched from using a screwdriver of proper size to a small 12V impact driver with proper sized bit, my problems seemed to go away. I can assemble and remove the screws without mangling the heads. I've snapped heads off with a screwdriver, but never with an impact, go figure.
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Old 11-03-2016, 11:33 AM
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after you drive them in the first time you should never have the issue. you literally have to cut the spiral into the metal housing.
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Old 11-03-2016, 11:36 AM
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Huh, I would have though an impact would mangle them in seconds. I did have some extra luck repeatedly backing out the screw a bit to get the threads made, but it is an extremely tight fit.
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Old 11-03-2016, 11:41 AM
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Those screws suck. I wish they would resize the holes to what they have on the diypnp as those go in just fine first time and hold well.
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