short story, i was driving to work, 20 min drive i was 5 min away, came to a light, car died, wouldnt start back up till it cooled down a little. it will crank start for a moment then die

MODS LIST (CAR RAN PERFECT WITH THESE.
speed den.
20g
denso 720
255 pump
manual fuel press. reg.
v3 full

what i tried and looked into

coil pack
ignition box on top on manifold
new cam sensor
new crank sensor
unplugged isc
new coolant temp sensor
new isc drivers and caps in ecu - i did myself with good ecu i had

after all these changes it does the same thing, here are 2 logs of the event happening

1st log is idle in driveway then it dies
2nd log is crank after it happened 4-5 cranks,

LOGS vvvvvvv HELP!!!!

Battery voltage is very low....

Vegas smith said:

Battery voltage is very low....

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do you think that would cause a stall like this? the alt. shows 14 when im driving and when the cars off is 11-12 and 12.x at idle

and also i have a battery charger hooked up as well right now and same thing, i could be in the middle of driving and it will just die, but not from a dead battery and alternator combo

do you think this is ecu related?

Not sure. My battery/alternator is about 14.1-14.4 when idling.

Vegas smith said:

Not sure. My battery/alternator is about 14.1-14.4 when idling.

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hmmm ill look into this

any ideas tho on my problem

well i sent my ecu to ecmlink today! lets see how it tests

so i talked to ecmlink today, they have tested the ecu and they said it was find on there bench test, they said it might be my MAP sensor for my speed density set up, do you guys think this is possible, my map sensor failing when the car reaches operating temp?

im getting my ecu back tomorrow, and im picking up a new omni 4bar map sensor as well, hopefully the sensor is the problem. but any body out there alive that has an idea looking at my logs what the problem could be?

mountainbike91 said:

so i talked to ecmlink today, they have tested the ecu and they said it was find on there bench test, they said it might be my MAP sensor for my speed density set up, do you guys think this is possible, my map sensor failing when the car reaches operating temp?

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anything is possible. my gm 3bar literally came apart on a 25psi BLT once..

curt-s said:

anything is possible. my gm 3bar literally came apart on a 25psi BLT once..

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but looking at the logs, look at the baro its -18 idle then just before it dies it shows -28 and rpm is still 900esh, so this is telling me it might be the sensor, but anyways i just picked up the omni 4 bar from my local shop chameleon tuning and my ecu is coming tomorrow, so the only way to tell is once i have the ecu back.

just waiting for ups to get here with my ecu, any moment now!!! then i let her idle with the new map sensor, lets see if it works! ill keep you posted, for who ever cares

As Vegas pointed out, your voltage is low. When you crank you are seeing 8-9 volts and when you are idling you see roughly 12 volts. With the key on engine off you see roughly 11 volts. Your battery at idle should read above 13 if not 14 volts and around 12-13 when off. It looks like your alternator and battery are going out in my opinion.

livedsm4g63 said:

As Vegas pointed out, your voltage is low. When you crank you are seeing 8-9 volts and when you are idling you see roughly 12 volts. With the key on engine off you see roughly 11 volts. Your battery at idle should read above 13 if not 14 volts and around 12-13 when off. It looks like your alternator and battery are going out in my opinion.

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look at the omni 4 bar in the idle then stall log above, would the low voltage cause this to happen? because it will die even if its revved and showing 14 volts

well my ecu just got dropped off about an hour ago by ups, so guess what. IT WAS THE MAP SENSOR THIS WHOLE TIME!!!! i dropped in the ecu and started it up with the new sensor, and bam! it stayed running for much longer and i even drove it with success, stopping and going with no stalls!!! here my log after it warmed up tonight!!!

When your car dies along side the road because your alternator took a crap and your battery cant hold a charge, dont come a crying. Glad you figured it out for now.

livedsm4g63 said:

When your car dies along side the road because your alternator took a crap and your battery cant hold a charge, dont come a crying. Glad you figured it out for now.

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my map sensor problem is solved, i jst ordered an oem alt from the dealership today, the only crying was my wallet!

The dealer? Ouch. I can only imagine their cost.