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PorterDsm

Weak spark car won’t start evo8+ in 2g Dsm

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Im not very familiar with the 2G platform as we never got them here in NZ, but a good place to start would be a short PC log of it cranking.  Here's a vid showing how to set it up if you are new to it:  https://www.youtube.com/watch?v=_P1LRANeO4A

 

Can you give me a bit of info about the 2G - do they have wasted spark coils with ignitiors built-in like similar to an Evo8?  Do they have a similar trigger to an Evo 8 cam & crank?  I vaguely remember one of the USA DSM's had the cam sensor signal inverted compared to the Evo but I think that might have been the 1G. 

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Im not convinced the trigger is happy, there's a few trigger errors clocked up and the cranking RPM is bouncing between 155(normal) and 450(not normal).  

Can you do a trigger scope when cranking.  Here's a quick video showing how:  https://1drv.ms/v/s!AiYbYlZQuRHPmidU5V2CmTcv6t2y?e=B0Uvsg

 

8 hours ago, PorterDsm said:

I am running a Omni 4 bar, I selected the "4 bar" as my map sensor option and calibrated it.

You MAP appears to be reading correctly.  There was a big spike in MAP when you first started cranking which caused the boost cut to kick in but I suspect that may have been a back fire?

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Yes it did have a back fire. I did the trigger scope and it doesn't appear like anything is happening but the rpms are still moving. I found out that my engine has the 95-96 cam sensor on it instead of the 97-99 cam sensor. The 97-99 cam sensor set up is the same as the evo 8. While thinking about it, the 95-96 (intake) cam sensor reads off of the cam gear side in which the cam is rotating clockwise also the way the sensor is reading. The 97-99 reads on the opposite side (passenger) of the same cam (intake) rotating counter clockwise. I read online about it and those did have to be inverted like you said. trigger scope log 1.llgWould that have anything to do with it?? 

trigger scope log 2.llg trigger scope 3.llg

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Did you click the capture button while the engine was turning like the video shows?  These triggerscopes look like they were captured before the engine was turning.  Or maybe the battery is flat and the PC is disconnecting during cranking?  Does the green "online" indicator stay green while cranking?

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Yeah, something wrong with your cam sensor/wheel, it appears to match the older Evo 1-6 pattern but it is upside down/inverted compared to an evo 1-6.  It doesnt match the Evo 7-9 pattern at all.

It will not work like this.  You will need to find the correct evo style cam trigger.

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I never switched 1/4 and 2/3 but I thought about it. Instead I just checked spark under ignition. I turned IGN 1 on and both 1/4 were sparking strong, same with IGN 2 on, 2/3 were sparking. Just to humor the theory though I ran out there and switched them and the car didn’t want to even try to fire. The car acts like it wants to fire with wires the right way..... I’m open to any suggestions, just kinda stumped.

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Are you using Evo 1-6 triggermode? - You should be.

Have you been through the "pre-start checks" in the manual - checked all sensors are reading correct, set base timing, adjusted master fuel etc?

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i have switched between the 1-6 and 7-9 both will not start the car, but ill leave it on 1-6. i did briefly go through the pre start checks. i didn't hook up the built in 3 bar map sensor, and did not adjust master fuel. I'm gonna go through it thoroughly today after work. The map sensor says its at 14.3 psi with the car not running?? 

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I had to swap the Fuel pump and AC clutch outputs in order to get my evo 8 to fire. Says it in the manual that you may need to do so. I had the same issues as you and that solved my problem. 

 

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10 hours ago, PorterDsm said:

The map sensor says its at 14.3 psi with the car not running

thats normal. MAP = manifold ABSOLUTE pressure. so the ~100kpa / 14.5 psi of Barometric pressure is displayed as well. MGP is what you are probably use to which will be 0 at this point.

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