JB4 issues

[R.G.]

I have no luck with JB4

Single turbo, MHD backend flash, map 1

AFR's are fine on start up then start jumping around eventually pegging 20, shudder, misfires, stalls

Any ideas? I've swapped the 02s in to different banks but same issues. Currently running grey 02 in bank 2

http://datazap.me/u/rgasmar/log-1460...g=0&data=18-24

[Terry@BMS]

See if you still have o2 sensor fault codes stored... Without fully functional o2 sensors nothing is going to work.

[R.G.]

2a2b Fuel mixture control only code showing

[R.G.]

Map 0, same thing.
Ran code checker on MHD

[Terry@BMS]

Definitely something bizarre still with the o2 sensors. The JB4 tuning is disabled on map0 and map1 with single turbos. Don't see how it could be having any effect on the sensor outputs but you could put the small black subconnector only back to stock, which is where the o2 sensor signals ride, just to be 100% sure its not related.

This is with brand new primary o2 sensors? Did you disconnect 19&20 on small black to disable rear sensor signals?

[R.G.]

Definitely something bizarre still with the o2 sensors. The JB4 tuning is disabled on map0 and map1 with single turbos. Don't see how it could be having any effect on the sensor outputs but you could put the small black subconnector only back to stock, which is where the o2 sensor signals ride, just to be 100% sure its not related.

This is with brand new primary o2 sensors? Did you disconnect 19&20 on small black to disable rear sensor signals?

I removed 19 and 20. Started it up and AFR's are perfect and match. About 15 - 20 seconds after bank 1 goes haywire again.

2016-04-13_19_43_35[1].csv

http://datazap.me/u/rgasmar/log-1460...data=1-4-18-24

No codes on JB4 read out now

[martymil]

Sounds like what happened to me, did you get a backfire at all

cracked intake manifold or a bad vacuum leak on the manifold

it will send your afrs haywire

check cylinder one on the manifold along the plastic welds especially

[Terry@BMS]

I removed 19 and 20. Started it up and AFR's are perfect and match. About 15 - 20 seconds after bank 1 goes haywire again.

If you have more time than money then maybe swap the sensors from bank1 to bank2 to see if issue moves with the sensor? If more money than time just replace both sensors.

[R.G.]

Sounds like what happened to me, did you get a backfire at all

cracked intake manifold or a bad vacuum leak on the manifold

it will send your afrs haywire

check cylinder one on the manifold along the plastic welds especially

Checked it, all looks clear.

If you have more time than money then maybe swap the sensors from bank1 to bank2 to see if issue moves with the sensor? If more money than time just replace both sensors.

I've already ordered 02s but am wanting to confirm if that is the issue while the car is down.

I'll swap the 02s and see if it follows and have removed the JB4 completely

[R.G.]

Swapped 02s and issue stayed with bank 1

Nothing is ever that simple with this car.

[R.G.]

What in the FACK

http://datazap.me/u/rgasmar/log-1460...16-17-21-22-23

[martymil]

you swapped the sensors but did you swap the connections otherwise the readings will stay the same.

But I'm not sure if you can switch the connections

Terry chime in here.

We swapped out a faulty front sensor on a mates car as it was going ballistic

after that all good.

[R.G.]

you swapped the sensors but did you swap the connections otherwise the readings will stay the same.

But I'm not sure if you can switch the connections

Terry chime in here.

We swapped out a faulty front sensor on a mates car as it was going ballistic

after that all good.

So swap the connections near the fuel rail also?

[BostonBeemah]

If you have access to a smoke tester, I would smoke test the intake manifold. Could be a leak in the gasket between the head and manifold. When swapping o2's if you are testing to see if the sensor is bad, swap the sensor and wires to see if the issue is isolated to that specific sensor.

[R.G.]

Would rep you guys again if I could.
Didn't even cross my mind to swap wires too. The issue followed the sensor after I swapped the wires. New sensor should be here tomorrow and hopefully resolves issue.

http://datazap.me/u/rgasmar/log-1460...0&data=4-17-21

[BostonBeemah]

Would rep you guys again if I could.
Didn't even cross my mind to swap wires too. The issue followed the sensor after I swapped the wires. New sensor should be here tomorrow and hopefully resolves issue.

http://datazap.me/u/rgasmar/log-1460...0&data=4-17-21

Nice! Hopefully that was it then which is a relatively simple fix. Keep us updated.

[Alpine]

Sub'd. Curious to know what I'm in for when the car gets over to the shop for install with my kit.

[R.G.]

Just a faulty 02. Swapped bank 1 sensor and all back to normal. Back to tuning now.

Definitely buy Chris's ADV sensors. His sensors are better in so many aspects. Worth the investment

[Alpine]

Probably will later in June. Just focusing on getting the car up and running right now. Trying to figure out how I'm gonna setup the JB4 so it doesn't mess with anything the shop is doing with their Cobb livetuning. My head hurts from all the reading I've done today. lol

Unrelated: The kit doesn't come with a MAC Solenoid right?

[terryd5150]

Would rep you guys again if I could.
Didn't even cross my mind to swap wires too. The issue followed the sensor after I swapped the wires. New sensor should be here tomorrow and hopefully resolves issue.

http://datazap.me/u/rgasmar/log-1460...0&data=4-17-21

I repped them all for you, except for Terry - I couldn't rep him again. I think I got him yesterday in another thread.

Pretty impressed with the way they gang-tackled the issue and didn't let go until it was solved.

Well done, gentlemen.

[Terry@BMS]

Happy to help although still confused why the thread is labeled "JB4 problems" instead of "o2 sensor code problems".

[R.G.]

Happy to help although still confused why the thread is labeled "JB4 problems" instead of "o2 sensor code problems".

The only variable that changed from running well to not was JB4 settings. Turned out to be a component failure.

@Alpine Correct, Mac doesn't come with the kit