[FCB]

I was driving yesterday on Lake Shore Drive and out of nowhere saw engine malfunction light and the car completely died. Luckily I was able to roll enough to the nearest exit and not be stuck on the highway.

the car was reading check battery terminal connection but the battery seemed to be working perfectly

i connected the jb4 to my laptop this morning and saw code 3100 low boost mode engaged

I really don't know where to start. Thoughts?

Mods I have
jb4
downpipe
meth
dci

[FCB]

also , car will not start up at all. I had to get it towed here and now it will not start. It will crank fine but won't start.

[n54gte]

Alternator? Starter?

[FCB]

but why would it throw out the low boost code then?

[335NJ]

Did your chargepipe pop off or something? Sounds more involved than that, but start there.

Also check your fuses.

[n54gte]

Originally Posted by FCB

but why would it throw out the low boost code then?

The car went into limp mode right before it died, probably to protect itself...any other codes?

[FCB]

3100 low boost mode engaged -- CEL displayed
2ACC DME digital motor electronics main relay, switch delay
2A9E Camshaft sensor inlet, synchronization
2FBE Fuel pressure after motor stop
2CEF Throttle valve actuater, activation
0000 Unknown Fault
0000 Unknown Fault
2D09 Drosselklappe
2DEB Power management, vehicle wiring system control

I finally got it to start but it definitely was not running right. shaking, revs going up and down. Sounded real bad

[Billit335]

Check your battery voltage.
Then clear codes and adaption with the car off, only do this if your voltage is at least 13 volts. If your battery voltage is less than 13 your battery may be bad. Bad batteries will cause our cars to act in strange ways.

[FCB]

11.75 on the meter. Think it's the cause?

[Billit335]

Yes

[Billit335]

Change your battery, get it programmed. So it's charged accordingly.

Reset your adaptations with your JB4, it should be good to go.

[sankohuy]

Please let us if changing the battery fixes it

[FCB]

thanks guys. Going to head to my part shop Monday and will let you guys know. I'm thinking of just getting a bosch battery for around $120 and then I know a guy to reprogram it.

[HardCoal99]

Careful unplugging the battery. A tech unknowingly broke the connector to the battery safety terminal and it was a royal pain to diagnose because it still appeared to connect. Don't pull too hard.

[mike@x-ph.com]

I would start with the battery.

[FCB]

do you guys have a link for resetting the adaptations with JB4? I want to be ready once I get the new battery. Thanks!

[Billit335]

Google jb4 command menu or use your lap top, that should do the trick.

[FCB]

new battery and reset adaptations. Car started but very rough once again. RPMs going up and down no power shaking and throwing the same codes pretty much.

I believe that you reset the adaptations by going to 1 on the speedo and 7 on the rpm right?

[gabylonfive]

I'm a Cobb guy so I could definitely be wrong, but IIRC resetting adaptations with JB4 doesn't clear codes does it? You need to clear those codes too.

[FCB]

Cleared the codes as well. Same problem happening. Going to have someone diagnose it and then do it myself. Thanks! Will let you guys know

[Billit335]

Yes that is the correct way to reset adaptations. What codes did you get from the JB4?

[n54gte]

check your vanos solenoids and maybe the vanos itself...i had similar idle issues and am still diagnosing it