DIYPNP no start problem.
07-05-2014, 04:52 PM
#1
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DIYPNP no start problem.
Hey guys, I have recently built my diypnp and I've been trying to learn how to use it. The build was simply enough, but now the software is the difficult part. Flashed the ecu with no problems, loaded the base map from diypnp and I have my timing set correctly and recently. The car wants to turn over, and it almost does sometimes. I tried messing with settings but nothing really make it get any closer to running. Any help guys? It's a 1995, all stock, maf in place.
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07-15-2014, 07:03 PM
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- Timing is not synced
- Sequential injection is activated. Did you install the sequential mod kit?
- Did you use test mode to check if all injectors and coils are functional?
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07-30-2014, 08:42 AM
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The way the install Diyautotune instructions read is that you don't worry about the timing pre-installation (I assume the assumption is that it started fine as it was), and therefore use the 'Ignition Offset' to adjust the MS to the desired static timing advance.
To me it makes sense to make sure the CAS position is at 10deg (or a fixed known point) before switching to the MS. That way the 'Offset' in MS can be used to dial out any difference between the MS and the CAS input rather compensate for a random CAS orientation.
How-To: Setup Base Timing
Apologise if I've completely misunderstood how it works (?), I would be interested in knowing although I guess not relevant to this thread
I can see that if everything is working fine there's no tech benefit to doing this. But when things aren't working...back to basics first, no?
I.e. pull the plugs one at a time and check they are all sparking, check pump is priming and there fuel to the rail...etc. My 95 started first or second time on DIYAutotunes base map with no modifications other than the basic setup stuff...so I don't see that the Map is going to be the issue.
I'll admit I've come from the world of 80's VWs...so Dizzys and mech fuel injection
To me it makes sense to make sure the CAS position is at 10deg (or a fixed known point) before switching to the MS. That way the 'Offset' in MS can be used to dial out any difference between the MS and the CAS input rather compensate for a random CAS orientation.
How-To: Setup Base Timing
Apologise if I've completely misunderstood how it works (?), I would be interested in knowing although I guess not relevant to this thread
I can see that if everything is working fine there's no tech benefit to doing this. But when things aren't working...back to basics first, no?
I.e. pull the plugs one at a time and check they are all sparking, check pump is priming and there fuel to the rail...etc. My 95 started first or second time on DIYAutotunes base map with no modifications other than the basic setup stuff...so I don't see that the Map is going to be the issue.
I'll admit I've come from the world of 80's VWs...so Dizzys and mech fuel injection
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07-30-2014, 10:24 AM
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Ok, fair enough.
Are rotating the CAS and/or altering the MS Trigger "Ignition Offset Angle" not effectively doing the same job? i.e. Setting up the relationship between the signal from the CAS to a known crank angle from TDC?
Any pointers/links would be appreciated, I've had a quick read though the following and I'm not quite sure where I'm going wrong:
http://www.msextra.com/doc/ms3/checktiming.html
http://www.msextra.com/doc/ms2extra/MS2-Extra_Gen_Ignition.htm.
Back to the OP, this link on the ms3 manual seems like a decent place to start: Megasquirt MS3 First start
Are rotating the CAS and/or altering the MS Trigger "Ignition Offset Angle" not effectively doing the same job? i.e. Setting up the relationship between the signal from the CAS to a known crank angle from TDC?
Any pointers/links would be appreciated, I've had a quick read though the following and I'm not quite sure where I'm going wrong:
http://www.msextra.com/doc/ms3/checktiming.html
http://www.msextra.com/doc/ms2extra/MS2-Extra_Gen_Ignition.htm.
Back to the OP, this link on the ms3 manual seems like a decent place to start: Megasquirt MS3 First start
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07-30-2014, 10:34 AM
#19
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Rotating the CAS will change the physical ignition timing.
Changing the offset/angle fine tunes the MS so that it's interpreting the CAS signal correctly.
The position of the CAS matters little once you sync because the MS can demand whatever timing you want.
But if you rotate the CAS after you've synced, the MS no longer will output the correct spark timing.
Changing the offset/angle fine tunes the MS so that it's interpreting the CAS signal correctly.
The position of the CAS matters little once you sync because the MS can demand whatever timing you want.
But if you rotate the CAS after you've synced, the MS no longer will output the correct spark timing.
Last edited by Braineack; 07-31-2014 at 08:10 AM.
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