Ran without jumping TSEL and OPTOUT, Damage?
 

Ive just built my 2nd MS for a friend, did all the mods (so I thought) and tested it. Wouldnt start when I tested it in my car (unplugged my MS, plugged this one in) and started fault finding.

Turns out, I hadnt jumped TSEL and OPTOUT, would I have caused any proper damage, and if so, to what?

Thanks

shouldnt have even been able to run, thats the jumper for the tach input.

Sorry maybe I wasnt clear. I tried to run the MS without the jumper and it wouldnt start.

Took it out the car and looked for faults. Realised the jumper wasnt there, so added it.

The car still doesnt start but ive not looked at anything else yet, i just wondered if I could have damaged anything by doing this

So long as your spark outputs were configured properly both in hardware and software, you should be fine. Cranking the engine without that jumper in place is roughly the same as just sitting there with they key on and the engine not turning at all. The MS won't see any RPM indication, so it won't do a thing apart from giving a priming squirt at powerup.


A thought on your other problems: most common source of "won't start after MS install" I know of is reversal of the 1/4 and 2/3 ignition triggers. I always like to disconnect the injectors (electrically) and have someone crank the engine while I watch with the timing gun on #1 to make sure that I'm not 180° off on my ignition.

Right this still wont start.

Joe, how do you "electronically2 disconnect the injectors?

Surely If im unplugging my working MS, plugging in the new MS, with the exact same firmware and map as my MS, and then trying to start it I couldnt possibly be 180 deg off, otherwise mine wouldnt work either?

Im getting the 2 outside LEDs lighting as they should when the ignition it on, MAP sensor etc is working. Plugged into the stim everything is working (no RPM obviously) (o2 seems limited between AFR of 10-12 for some reason) so Im a little stumped.

The 0.1uF cap that is used between JS8 and GND, I had accidentally put between JS8 and 5V..........oops. But I replaced the cap with a new one and its now going to GND.

Any ideas?

Thanks

To "electronically" disconnect the injectors, you either unplug the individual connectors going to them, or unplug the common connector which feeds the INJ harness.

So, you've got two MSs, one of which works on both the car and the stim, and the other works only on the stim?

Do you get an RPM indication in MegaTune when cranking the non-working one in the car?

Oh right I thought you meant a setting in MT or something lol, not just unplugging em

Right, on the stim, both units are the same in that they both flash IDL, IGN and PMP when first plugged in. Strangley though, my known working unit then drops down to JUST having IGN lit (regarless of where the RPM pot is set to) whereas the new non working unit drops to having IGN and IDL lit when RPM is low enough?

On MT using the stim, both units look identical when moving pots etc

The non working unit doesnt produce any movement from the RPM dial on MT during cranking when plugged into the car. Heres a log of the new unit being cranked



Attachment 12743

Any ideas, I still cant get this bloody thing working!

Well, that's where you need to start. You've got something wrong on one of your trigger inputs, probably the primary. You mentioned not jumpering TSEL, did you forget to jumper TachSelect (the other side of the circuit) as well?

Tachselect is definately jumped to OPTOIN

Still having no luck with this. Could ^^^ that have caused any damage to the tach circuits?

Thanks

Ok the plot thickens.

Looking over this board for the 100th time, I just realised that D3 was in backwards.....
I really shouldnt build these things while doing night shift, far too tired!

Car still wont start though and stil has no revs?

Also D8 isnt installed but braineaks guide shows it installed? I removed it when doing the idle mods, right or wrong?

it really doesn't matter either way piggy, but it needs to be removed with the idle mod.

post pics of the board top and bottom and lets see if we don't notice anything.

Oh god it runs!!! Im so so so happy lol. Im happier getting this second one working now than I was getting the first one working!

Turns out I was aleep/drunk/under the influence of drugs when I built this one. I literally thought id copied the first ones mods to the T. I hadnt. I hadnt run the wire from D1 to U5.

Put in the car with my map, started first go :) woo hoo

Thanks for the help people