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VVT into a 95, MS3X built to Trubokitty specs - no start

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Old 02-25-2019, 07:41 PM
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Originally Posted by gooflophaze
That crank sounds real slow.

And while you have fuel and spark, could really use a log file to tell if you're getting sync or not. Just because it's triggering doesn't mean it's synced.

And something simple to check - since you're getting flames out the intake - put your hand over the exhaust and crank. Is the exhaust sucking in? If so you've got the cam's facing the wrong way.
Crank speed seems to alternate from "normal" to what you're hearing in the video. I don't currently have a Miata battery for the car so I'm using a group 27 via jumper cables and I keep it on a tender when we aren't trying to get the car started.

As you can see in the video, I'm following Curly's instructions butI'm not sure if I'm getting working logs. I've posted a couple but haven't had anyone chime in on them?





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Old 02-25-2019, 08:00 PM
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your timing looks spot on.

I had no start issues for some time but my problem was no spark. But it was intermittent . In my case it was a toothy off with timing belt & a setting within MS. But I gotta say. That cranking is real slow. I know you don't have a battery but if that was my battery I'd probably be charging that for a about 1 week. or throwing it in the bin.
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Old 02-25-2019, 08:02 PM
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when you say custom harness....what does that mean?
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Old 02-25-2019, 08:04 PM
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Alright - cams are faced outwards so it's not backwards. Your log is too short, I can see anything.
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Old 02-25-2019, 08:15 PM
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Originally Posted by StanTheMan
when you say custom harness....what does that mean?


New harness for items that didn’t exist on the car in 1995. Cam sensor, crank sensor, VVT actuator and VICS actuator. Two wires that are cut at the. Orrin of the images are signal wires for VVT and VICS, don’t really need to worry about them yet...
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Old 02-25-2019, 08:16 PM
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Originally Posted by gooflophaze
Alright - cams are faced outwards so it's not backwards. Your log is too short, I can see anything.
its a 10 second sample, I just don’t think it’s functioning properly?
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Old 02-25-2019, 08:19 PM
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Originally Posted by StanTheMan
your timing looks spot on.

I had no start issues for some time but my problem was no spark. But it was intermittent . In my case it was a toothy off with timing belt & a setting within MS. But I gotta say. That cranking is real slow. I know you don't have a battery but if that was my battery I'd probably be charging that for a about 1 week. or throwing it in the bin.
ill get another vid of the “normal” crank but it’s probably worth noting that the mega squirt has not had any voltage issues aside from two or three times where I didn’t have the battery on the tinder while we were cranking for 3 to 5 minutes at a time.
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Old 02-25-2019, 08:48 PM
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So it's been awhile since I poked composite logs - but basically in order to accurately log the teeth (because it happens faster than the serial data is broadcast) so MS has to record the data to memory then flush the data through the serial port - so it's a bunch of flush and dump and not realtime. So - you gotta log blindly. I only see 2 teeth in your log and I think it's a total of 227ms.. or .2 of a second.
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Old 02-25-2019, 08:58 PM
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Originally Posted by gooflophaze
So it's been awhile since I poked composite logs - but basically in order to accurately log the teeth (because it happens faster than the serial data is broadcast) so MS has to record the data to memory then flush the data through the serial port - so it's a bunch of flush and dump and not realtime. So - you gotta log blindly. I only see 2 teeth in your log and I think it's a total of 227ms.. or .2 of a second.
log posted was taken from the cranking shown in YouTube vid. Would this be a sync issue perhaps?
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Old 02-25-2019, 09:04 PM
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Even a normal log would help determine, though a composite log will help determine which sensor has gone wacky. Or it could be low voltage.
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Old 02-25-2019, 10:05 PM
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you have a toothed trigger wheel. Right? for memory the one on my engine had 4 teeth. I replaced it with a 36-2 trigger wheel
the trigger angle /offset is set at 5.5 deg.

I know its only 5.5 deg & shouldn't stop it from starting. but with a toothed wheel should this not be right on 0 because you've removed the NA8 CAS?
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Old 02-25-2019, 10:27 PM
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Originally Posted by gooflophaze
Even a normal log would help determine, though a composite log will help determine which sensor has gone wacky. Or it could be low voltage.
I'll have to wait and coordinate with Ari, my POS laptop is being itself.

Originally Posted by StanTheMan
you have a toothed trigger wheel. Right? for memory the one on my engine had 4 teeth. I replaced it with a 36-2 trigger wheel
the trigger angle /offset is set at 5.5 deg.

I know its only 5.5 deg & shouldn't stop it from starting. but with a toothed wheel should this not be right on 0 because you've removed the NA8 CAS?
Factory NB2 wheel is 4 teeth, yeah.
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Old 02-27-2019, 12:54 AM
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Ok, logs.
Attached Files
File Type: msl
2019-02-26_22.24.54.msl (205.4 KB, 49 views)
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Old 02-27-2019, 03:16 PM
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Alright you've got something wrong going on in your MS. I don't see any appreciable sync loss (which is what most people have issues with).

Your AFR is reporting 10.1-ish, your MAT goes from -8f to 14, CLT is at a steady-ish 180f, your TPS jumps from 36 to 101 - while cranking. MAP is 85-ish before and while cranking. None of that makes sense. In the 2nd log - values appear to be more realistic, but then go right back to "******* whacky" in the third. Something is miswired - unless you were furiously pumping the throttle or doing a flood clear during those cranks.
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Old 02-27-2019, 04:09 PM
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I might have been pumping the gas, I was a few drinks in by this point... WBO2 isn’t wired in yet (waiting on Blue Sea fuse box to wire in gauges and racepak) neither is the CLT as I’ve got the 3 pin sensor from the VVT engine and the stock 2 pin connector, I just haven’t grabbed a new 2 pin sensor yet.
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Old 02-28-2019, 12:28 AM
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You’ll have a seriously hard time firing up a cold engine when it thinks it’s 180, unless you completely destroy your cranking and fuel maps
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Old 02-28-2019, 12:49 AM
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So that’s a tuner studio issue, yeah? I’ll go buy the proper CLT sensor for my 95 harness but either way, I need to double check the CLT sensor settings?
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Old 02-28-2019, 03:01 AM
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Well, not to mention that if your TPS > 80%(?), it won't fire the injectors for flood clearing - which you are at the entirety of the first log while cranking.

But with *all* those sensors going wonky, I think you've got something miswired / mis soldered.
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Old 02-28-2019, 05:45 PM
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Originally Posted by Stock
So that’s a tuner studio issue, yeah? I’ll go buy the proper CLT sensor for my 95 harness but either way, I need to double check the CLT sensor settings?
I already calibrated that in your tune, just install it.
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Old 02-28-2019, 05:56 PM
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It runs!

Added the CLT sensor, double checked my IAT wiring (it was good), cranked it for 15-20 seconds and it fired up. Such a huge relief.

I appreciate the hand-holding guys!
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