defueling at 210 deg.

[farmer]

Truck runs fine til. temp gage hits 210 deg., Then is like it goes back to stock tune. Just wondering if anyone has heard of this. Thanks

[DmaxHawk]

What type of tune are you running? DSP5, DSP2, single flash? What engine do you have? I assume you have an LB7?

[farmer]

I have a lb7 engine, This is a single flash. The tune is bullydog pup, that I added fuel to. To make it smoke alittle

[farmer]

I have engine codes,po234 turbo eng. overboost, po089 fuel pressure regulator 1 performance, po101 mass air flow senser performance. Just thought this would help out.

[DmaxHawk]

I havent heard of anything like that. I would try copy and pasting all the fuel and boost tables from the bullydog onto your stock tune and try that.

[mvnvltn]

The 234 over boost code will cause defuel. Go to C0301 and set these to not reported. That should solve the "Limited Power" issue. I had the same problem when I went to a different turbo. It may not be necessary for all 4, but that's what worked for me.

[farmer]

Thanks I tried that and it works fine.Thanks for all your help.

[mvnvltn]

are you running a K&N type filter?

[DmaxHawk]

are you running a K&N type filter?
Good question, or any other oil-type filter

[mvnvltn]

Are you using a lift pump? What is your max inj pulse?

[farmer]

Im running a k&n cold air intake, My pusher pump is a raptor 150, Main inj. pulse is 3250

[DmaxHawk]

the oil in the k&n may be messing with your maf

[mvnvltn]

the oil in the k&n may be messing with your maf

Yes I agree!!! To be honest there is no gain on a Duramax other than sound, from an intake. The K&N style filter can actually have the oil sucked off them and contaminate the mass air sensor. I had this happen to me from a drop in style K&N. To remedy this, you can either swap back your stock intake or try to keep using the K&N.

A method of cleaning the mass air flow sensor is to get some "Non Residue Electronic Parts Cleaner" from Radio Shack (or equivalent).
http://www.radioshack.com/product/index.jsp?productId=2102649

Make sure it dries before you reinstall. Since the Sensor heats up to operate, any wet residue can damage the sensor.

This should fix your MAF code/ issue. It has worked for me an many others.


Your pulse might be a liitle high. Have you logged your Fuel pressue to see what it is staying around?

[DmaxHawk]

Yes I agree!!! To be honest there is no gain on a Duramax other than sound, from an intake. The K&N style filter can actually have the oil sucked off them and contaminate the mass air sensor. I had this happen to me from a drop in style K&N. To remedy this, you can either swap back your stock intake or try to keep using the K&N.

A method of cleaning the mass air flow sensor is to get some "Non Residue Electronic Parts Cleaner" from Radio Shack (or equivalent).
http://www.radioshack.com/product/index.jsp?productId=2102649

Make sure it dries before you reinstall. Since the Sensor heats up to operate, any wet residue can damage the sensor.

This should fix your MAF code/ issue. It has worked for me an many others.


Your pulse might be a liitle high. Have you logged your Fuel pressue to see what it is staying around?

there is a benefit but only after 500 horse.

[mvnvltn]

there is a benefit but only after 500 horse.

That could be debated, another day:cheers:

[DmaxHawk]

That could be debated, another day:cheers:

hahaha I agree :cheers:

[vortecfcar]

All of the codes you've listed will put the truck into reduced power mode. That's the source of your 'stock feeling tune'.

Nick