Engine flatlines/jumps

Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

its a Powermaster 140, with an Optima redtop. i was thinking perhaps i was chaffing the ECM harness. My computer sits in the glove box. But i have cushion padding where the harness comes through the glove box, so the wires are protected.

With the truck off, the system reads 12.6v. With the truck running and the system charging its about 14.7v. tested at battery terminals, and at alternator post.

i have 70A worth of auxiliary fuses wired to the alternator, plus the standard feeds. All the load might be jacking the voltage up.
 
bezerk

bezerk

New member
Re: Engine flatlines/jumps

i have this problem with the mustang as well. and i was wondering. i'm driving 3500RPM, than when i get over it it starts to sputter and the tach drops to 1500rpm.
i think my problem is that it gets a bad signal thinking the engine is doing 1500rpm instead of the 3500rpm, and starts to act like it's running 1500rpm.

can that be your problem? that your signal coming from the coil is bad?
 
turbodig

turbodig

Active member
Re: Engine flatlines/jumps

Aeroking said:
its a Powermaster 140, with an Optima redtop. i was thinking perhaps i was chaffing the ECM harness. My computer sits in the glove box. But i have cushion padding where the harness comes through the glove box, so the wires are protected.

With the truck off, the system reads 12.6v. With the truck running and the system charging its about 14.7v. tested at battery terminals, and at alternator post.

i have 70A worth of auxiliary fuses wired to the alternator, plus the standard feeds. All the load might be jacking the voltage up.
Click to expand...

Try a regular lead-acid battery vs. the optima... swap out from another vehicle just for the test.

I've seen some really bizarre things electrically with optimas.
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

i ordered another reman ECM pickup in 2 days, and i'm gonna try running the truck off of a different battery. Also, i'm gonna rehotwire the ECM to get power from the battery, instead of the alternator. and check my battery cable for corrosion.
 
Sy-1177

Sy-1177

Turbo Inside
Re: Engine flatlines/jumps

Hey Brandon, i'm probably a little late but I have a spare ecm you can use so you don't have to buy one. Let me know.
 
Syclone#892

Syclone#892

Member
Re: Engine flatlines/jumps

I have my ecm in the glove box also and know the wires are pretty tight in there do you think one wire could be partially making contact because of that?

I had some voltage probs because of the former owners bad relocation of the battery to the bed of the truck. I had about a volt drop from the bat to the alt/ecm. I now have a 4ga from the alt to the bat in the bed and 2/0 grounds and from the starter to the battery. Volt drop at the batt vs alt/ecm is .1 now :D

Good luck I'm very curious to see what you find the problem to be! You will find it too sometimes it takes just letting it sit for a little while and coming back to it with a fresh mind too.
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

still no good.

http://www.syty.net/forums/showthread.php?t=60080&highlight=dead+aldl

same problem as last time, but with a different set of symptoms.

- new (reman) ECM in the truck
- all fuses are good
- good power and ground to ECM
- rough idle around 500rpms (TRUCK NOT RUNNING OFF OF ECM)
- about 10 inches of vacuum
- "Check Engine" light wont come on at all, even with ports jumpered
- Ostrich loads and verified the BIN
- ALDL port wont connect "Connection Failed"

the last time it was the Ostrich ribbon cable. I'm gonna have to order another one again.

Strange thing is in between running good, and not running, i never touched the truck. Just stopped at the gas station. So i would be surprised to see its the ribbon cable. But its full of surprises. So another week without the truck. :?
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Engine flatlines/jumps

Have you checked to see if the bulb in the dash is still working?

Otherwise can you get an ALDL from the ECM directly somehow - sounds like maybe your loom is cut somewhere or at least shorting out.
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

Quickstop [UK] said:
Have you checked to see if the bulb in the dash is still working?

Otherwise can you get an ALDL from the ECM directly somehow - sounds like maybe your loom is cut somewhere or at least shorting out.
Click to expand...

when you first turnt the truck to on, all the lights light up, so the bulb is working.
 
Six Shooter

Six Shooter

New member
Re: Engine flatlines/jumps

Sorting out some issues with the 93 Ty. It does pretty much the same thing the guy is mentioning with the mustang. It's currently at the tranny shop as they tend to a leak. On the Ty, when it stumbles, check engine light comes on for a few seconds. Hopefully I can pull a code from the ecm and pinpoint the problem. The truck is bone stock. I'm pretty sure it's ignition related in my case, but will post my findings as soon as I have news to report.
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

now the truck wont start at all. it just cranks. I swapped the emulator for a brand new chip, and ALDL still doesnt connect (verified USB ports). battery has a good charge. and the Check engine light wont light.
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

tracked it down to the G1 adapter. Now i'm on the fence whether to continue with $59, or invest in a stand-alone.
 
UR50SLO

UR50SLO

V6+2=LSXCamaro
Re: Engine flatlines/jumps

Did you ever find that miss I felt in the truck?

Let me know if you want to go XFI. ;)
 
WyoSyclone

WyoSyclone

Active member
Re: Engine flatlines/jumps

Aeroking said:
tracked it down to the G1 adapter. Now i'm on the fence whether to continue with $59, or invest in a stand-alone.
Click to expand...

What happened to the G1? ...not much to go wrong there. I've had mine in for 3 years now and not a problem... I'd just continue on with 59 ....my :2cents: :D
 
Aeroking

Aeroking

e.i.
Re: Engine flatlines/jumps

i think the truck deep down wants to be stock....

anyways. here's todays rundown.

Brand New ECM, Brand New G1 adapter, new ZIF socket, brand new 512 chips, old Ostrich 2.0


So the ECM currently resides on the floorboards for easy diagnosing. My current (last month or so) problem is that the ECM wont connect to the truck, giving no ALDL response, and causing the truck to run on "initial" timing, and whatever fuel the injectors can shoot out. Placing the stock memcal into the ECM, netted me success. ALDL access, and the truck started and idled, half decent. After testing with a new 512 chip, and the ostrich, i came to the conclusion that the G1 adapter was at fault. So i purchased a new one.

Bounce to today. Have the new G1 in the new ECM, burned a fresh BIN on a new chip... and no go. No ALDL, truck idles like crap. Test 2, i plug the ostrich in and upload a BIN, and no go again. Take the G1 out and inspect it, looks fine. Put the stock memcal in, and yep still good with the memcal. I put the ZIF socket onto the G1, put it back in, and dropped on a freshly burnt chip. Nothing. Popped the chip out, and put the Ostrich back onto the ZIF, loaded a BIN, and it fired up and idles like it should.

So, what is wrong??? I tried the exact same combination 3 times in a row. Bad, Bad, GOOD.

So as of right now, chips wont run the truck, just the ostrich will, and only when it feels like it. So my confident feeling of unreliability has gone to hit and miss.
 
WyoSyclone

WyoSyclone

Active member
Re: Engine flatlines/jumps

Aeroking said:
i think the truck deep down wants to be stock....

anyways. here's todays rundown.

Brand New ECM, Brand New G1 adapter, new ZIF socket, brand new 512 chips, old Ostrich 2.0


So the ECM currently resides on the floorboards for easy diagnosing. My current (last month or so) problem is that the ECM wont connect to the truck, giving no ALDL response, and causing the truck to run on "initial" timing, and whatever fuel the injectors can shoot out. Placing the stock memcal into the ECM, netted me success. ALDL access, and the truck started and idled, half decent. After testing with a new 512 chip, and the ostrich, i came to the conclusion that the G1 adapter was at fault. So i purchased a new one.

Bounce to today. Have the new G1 in the new ECM, burned a fresh BIN on a new chip... and no go. No ALDL, truck idles like crap. Test 2, i plug the ostrich in and upload a BIN, and no go again. Take the G1 out and inspect it, looks fine. Put the stock memcal in, and yep still good with the memcal. I put the ZIF socket onto the G1, put it back in, and dropped on a freshly burnt chip. Nothing. Popped the chip out, and put the Ostrich back onto the ZIF, loaded a BIN, and it fired up and idles like it should.

So, what is wrong??? I tried the exact same combination 3 times in a row. Bad, Bad, GOOD.

So as of right now, chips wont run the truck, just the ostrich will, and only when it feels like it. So my confident feeling of unreliability has gone to hit and miss.
Click to expand...


I hate to ask this question, but the chip is in, in the right orientation?
 
WyoSyclone

WyoSyclone

Active member
Re: Engine flatlines/jumps

Aeroking said:
you bet, the other direction, then it'll just crank and wont start at all.
Click to expand...

I never saw that episode with Chumli :D

When I had my ECM on the floorboard for a few weeks I noticed there was a very sharp edge that all the ecm wiring rubbed against up under the dash... I stuffed a rag around my wiring. Have you checked that wiring for problems?
 
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