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Microtech Lt-8 dies on Crank S4 Single snail

Old 02-09-07, 02:24 AM
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Lt-8 dies on Crank S4 Single snail

K i need help asap.. verbal or thru email...
I wired up my MT Lt-8 and i did as the wire'ng diagram says. Only problem:

Wen i turn my key to on everything works fine. coils have power fuel pump works, hv fuel pressure etc.
then wen i go to start the car it doesnt fire and MT goes dead.

this only happens wen i crank the car. other than that the MT works n i can scroll thru my maps on the hand controller and read feed back on the dash unit.

can anyone help.

phone calls greatly appreciated PM or email @ [email protected]
Steven @ (623)698-7880
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Old 02-09-07, 05:15 PM
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are you shure that you have power the the ecu in run and crank? hook up a meter to the power wire and the ground and crank it and make sure that you have power while cranking.
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Old 02-09-07, 05:37 PM
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Your problem is very simple.
You either have low voltage on crank. OR your PINK ignition wire is not recieving 12v on crank.

This would be very easy to test. You simply unplug the main plug on your microtech. Get a multimeter and test if their is 12v at the pink wire while cranking. (anything over 8.5v is ok).
If their is 12v at crank on the pink wire. Then check your voltage on the MAIN power wire(RED) to see how low the voltage gets on crank.
Check these 2 and its bound to be one of them.
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Old 02-11-07, 08:24 PM
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Ok i will do. Ill update n jus a few min

Also wen i do crank i get spark n then it dies while still cranking.
this goes for both leading and trailing coils. There is power from the ignition(blk/white stripe wire) on my fuse panel under the dash.
ive ran a 14g wire from that directly into the coil wirring and still the same single spark from wen i start cranking.

Any other trouble shooting tips?
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Old 02-11-07, 10:18 PM
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So i used the multi meter n tested for voltage on both pink 12v and red power wired at the ecu plug. the readings are 6.25 volts on both while cranking the engine over. Still same problem. Microtech goes blank while cranking.

I have fuel pressure oil all of that and no spark with a dead microtech while cranking.

I oh so want to give up. Help please!!!!
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Old 02-12-07, 07:16 PM
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i,m pretty sure , your power cut when you crank the engine , so check qith a test light when you crank the engine you have power on your fuel pump and ecu (igition). , you can use the power from the clutch switch to powered the ecu.
give me news
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Old 02-12-07, 09:42 PM
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Look into your power source.
Most of the electrical circuits are cut while cranking to provide maximum power to the starter.
Make sure you are tapped on a good circuit by verifying voltage while cranking.

"So i used the multi meter n tested for voltage on both pink 12v and red power wired at the ecu plug. the readings are 6.25 volts on both while cranking the engine over. Still same problem. Microtech goes blank while cranking."

Re-verify again but if this is the case, I suggest looking into the starting circuit. Maybe a bad or going starter motor draining too much current. Clean your connections and try with a known good battery. If you get the same results, try another starter if available.

Good luck, keep us updated.

Last edited by Rizla+; 02-12-07 at 09:43 PM. Reason: typo
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Old 02-12-07, 09:54 PM
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6.25v is too low.
thats your problem.
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Old 02-13-07, 12:04 AM
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Ok so tonite i ran a positive red 12v with 20amp fuse to the 4mm 12v red wire from the MT harness together used a battery jumper and after a few tries my car attempted to start.

tried again and gave it a little gas and it started up ok fairly ruff.
it idle'd ok n almost smoked out the garage wit fumes

While cranking the MT shut off then came on and thats how my engine started.
I shut the engine off due to it bein 930p AZ time and since then im back to square one.

The MT shuts off during crank. So 2nite im going to take the whole harness out and rewire the car tomorow nite as if it was a fresh install.
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Old 02-13-07, 09:02 PM
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TOday i thot of this wonderful idea and wired the 12v PINK wire directly to the starter. And whalla it started up jus fine.

So my new attempt is to run a bigger size guage wire (14-16g) or so and splice in a toggle switch. Thanx you guys for all ur help n advice.

One last thing. I have used a Napa battery charger (tha rolling one) to start my car.
If thats not hooked up into my battery cables my car cranks slowly and the microtech still doesnt stay on under cranking.

Im wondering if sumthing is backwards n the harness connection where the relay is. but according to the wirring diag. its all correct.
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Old 02-22-07, 01:41 AM
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Originally Posted by Mixed_88TII
TOday i thot of this wonderful idea and wired the 12v PINK wire directly to the starter. And whalla it started up jus fine.

So my new attempt is to run a bigger size guage wire (14-16g) or so and splice in a toggle switch. Thanx you guys for all ur help n advice.

One last thing. I have used a Napa battery charger (tha rolling one) to start my car.
If thats not hooked up into my battery cables my car cranks slowly and the microtech still doesnt stay on under cranking.

Im wondering if sumthing is backwards n the harness connection where the relay is. but according to the wirring diag. its all correct.
If it cranks slow when not connected to your jumper, then change your battery.
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Old 02-22-07, 03:18 AM
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or you have a bad connection/ground somewhere.

quit trying to find fault in the harness, if the car ran then you have a battery/battery wiring issue.
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Old 02-22-07, 07:52 AM
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Originally Posted by Karack
or you have a bad connection/ground somewhere.

quit trying to find fault in the harness, if the car ran then you have a battery/battery wiring issue.
Exactly you shouldnt need to do any alterations other than removing some stuff if you want. But adding bigger guage wires is pointless. Also, there is no need to connect it to the starter. I connected my pink to the coil pack. You have a low voltage issue which is why its turning off during crank. has nothing to do with your harness.
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