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That did it, turned a/c off and no more timing dips,

now to modify the a/c control head to not turn a/c on with defrost (gm did this to remove moisture but it usually just results in a hvac...

stock tune does it as well, first time i saw this was on a 6.0 litre with my old serial cable, i just thought it was glitching, now seeing it with usb cable, going to verify tommorow with tech2 just...

I cant take it anymore,:banghead: i have seen this happen on many engines, mostly trucks with ls1, basically the timing at a seemingly regular interval drops 20 or so degrees for no apparent reason,...

the OBDII standard defines all the codes already

Uxxx is serial data line errors, each module has its own number

Pxxx is powertrain

Bxxx is body

Cxxx is chassis

for the 2007 model year the General is installing a particulate filter in the exhaust system, this particulate filter will be monitored by an exhaust pressure sensor, too litte pressure-filter be...

I have personally used a true autotune system, was on a honda vtec engine, the software automatically applies corections to the base fuel tables via an emualtor, works very smoothly. In order for...

This dont really belong here but i am so proud of it that you all just have to see what my hot rod looks like so far

http://www3.telus.net/CarTunes/home/Other%20stuff.htm

well I hate to burst the bubble but there already is a tuning solution for duramax, covers all 2001 through 2005, light duty and medium duty and it is a very nice product, i have used it on many...

tunercat has what you need, just send him an email

other than adding the extra sensor and related wiring nothing
except
changing the entire abs system from a 3 channel control to a full 4 channel control, that means the ebcm and the ehcu, about 2k...

misfire in #7 usually indicates crap in the fuel rail plugging injector screen.
take a look at your fuel rail, fuel enters the middle which results in the back of the rail acting as a sediment trap...

check the air fuel ratio when the bog is occuring, sound like it may be too lean.

could also be timing table needs adjusting

Hptuners (the guys that runs this site), with whom i have no affiliation other than owning a couple of their products does not teach you how to tune a vehicle, nor should they. they are simply...

If you want to see how I am going about building my 1956 gmc truck with some unique powertrain choices check my website here http://www3.telus.net/CarTunes/home/Other%20stuff.htm

there is no tuning software available for the stock pcm, the holley 950 can be used to run the norhtstar though, the guys at chrfab can set you up.

Do yourself a huge favor and go get a pcmcia serial port card,

I could send you somewhere around 37 vins if you need vins, but is suspect you are just looking to see how many buyers there are. I will buy the dealer package for duramax the day you release it! I...

I second, third and fourth that!!

DURAMAX diesel support would be outstanding!!

you will be turfing your 1227730 tpi computer and replacing it with a 1227747 computer, this computer was used in turbo sunbird, grand am and cyclone applications, you will then need to download the...

2.5 litres in 10 k falls within acceptable factory allowances. now dont tell me you are actually going 10k between oil changes and expecting your engine to live are you?

now if you are driving a...

looks to me like you have some drive train slip issues going on there. in scan 1 vehicle speed is 40 mile per hour at 4800 rpm, in scan 2 vehicle speed is 55 mph at the same rpm of 4800 rpm.
...

the 1995 s/t series trucks are the basta$% children of general motors, there pcm is also used in the buick regal and some others but there is no software available for that particlar pcm as far as I...

you need to raise your 3-4 shift speed in the shift speed VS %tps table

ls1 is coil near plug and sequential injection so who cares what the commanded firing order is, just wire things up so proper coil fires at the proper time and do the same for the injectors.

pcm...

skip the dyno tuning all together, just use it as a final measurement!

I mean go to the track on street legal night and make as many runs as you can with small changes between each run. Once your...