Tuning Problems

[turbochargedv6]

Well here we go, I have new injecotrs and matching chip from caspers. The injectors are msd 50lbs and have the walbro gss340 and adjustable fuel pressure regulator which is set at 43.5 with line off. I have new iac and tps and have them set in the area they should be and the 02 sensor is new, my maf is 8-9 a/f on the scanner which is high. I basically have a surge in the idle only when it warms up, cold is fine and it starts right up. I have the thumbwheel set for stock right now and in my search on the site I have read check the ve numbers. I need to know what does ve stand for? clueless have learned a lot about these cars in the last year but I am sure I will be learning a lot more in years to come. I need someone to explain if they can about what to check and in detail no abbreviations please?

BLM 115
a/f 8-9 high stock maf with k&n filter 9" connected in front of maf
tps .44
iac 15-35

o2 numbers jump around too much, It is not on the road yet and want to get everything tuned decently before I put it on the road and it is also ****ty weather in rochester, ny so rather wait another month before I do, don't want the salt to eat my car up. I did have a few leaks with the exhaust and turbo inlet but all are fixed and I have no vacuum leaks. I hope I included everything you may need to help me if not let me know and I will get right back to you. Thank you in advance and at least I can say for now it's getting better thought it never would for a while.LOL

 

[xxninja]

wel i dont know what VE means

but from what you posted. i can give my opinion on a few things

1) you state that your fuel pressure is at 43.5 line off
this is waaay too high for a hot-aired buick.
43 is for intercooled cars, try backing your fuel pressure down to like 38.
Most chips and fuel regulators are sold with Intercooled cars in mind, SO they always state (43) is the proper Fuel pressure for a turbo buick.
Hot Airs dont need as much fuel because the charge is alot hotter then an intercooled car.

2) your TPS looks good and your IAc looks good too
when you checked your IAC, you did make sure the car was warmed up, and in gear with your foot on the brake???
dont check the IAC in park and cold .

*alot of times a un-properly set Iac can make your car idle high and raise your Maf readings up.

*normal Maf reading should be 5-6


3) BLM 115, this reading should be closer to 128 at idle
* If Blms are under 128 it means the car is running rich, and the ecm is taking fuel out of the fuel program.
* Iif BLms are over 128 it means the car is running lean and the Ecm is adding extra fuel to the fuel program.

Im betting if you lower your fuel pressure down a few pounds , you will see your BLM's rise to about 128 !!!!!

i'd recommend doing a search of "high BlMs" and "low BLMS"

and u can learn a little more about what causes high Blms and what causes Low BLMs


hope this doesnt confuse ya too much lol

 

[turbobooster]

ok what r blm's ? clueless

 

[turbochargedv6]

Hello,
will turn down the fuel pressure a tad bit and see if that raises the blms. I am also hooking up a compressor air/oil seperator filter to run through my pcv valve so no more oil gets in the damn intake. I have been playing with it and can get it to idle nice at 1200 rpms with no surge but when I try to drop it, it goes to hell and the engine surges again. I will figure it out someday, thanks for the reply and have been reading up on blms and other scanner information.
Thanks Frank

 

[xxninja]

ok i stold this from another Post

The cliff notes version is this: They are long term fueling values used in commanded injector constant calculation. 128 is the default value until the ecm learns differently. If the values are lower than 128 then the ecm is detecting a rich condition and pulling some fuel out and vise versa for higher than 128 for a lean condition. Usually if your BLM matrix is in a plus/minus 10 from 128 range your good to go but if your outside this its not a bad thing either as long as you don't hit the limits usually around 90 and 150 then the ecm can no longer adjust from there. Since our matirx grid is so small we move thru it very rapidly and several cells won't ever get used because your never in those ranges for it to learn different. Also some cells are only used on decel so those values are almost always lower than 128 but nothing to worry about.

and this ...........

Man, I'll try but trying to answer what they are is gonna be....yeah. The only time you need to worry about them is if they are pegged in either direction at idle with the car at operating temp. A BLM reading of 95, for instance tells you that you have a condition leading the computer to believe it needs to take fuel away from the mixture. A reading of 160 is the opposite, the computer adds fuel. The later is usually caused by vacum leaks, bad check valves and such. These are the two extremes. The "holy grail" of BLMs is 128. This number represents stoikiometric(?) perfection. All that means is the computer is running a perferct 14.7 to 1 air fuel ratio. So what is a BLM? It is a numerical value given to a program the computer chooses to run depending on readings from the outside world. ie MAF,O2 sens, ect. This is how I understand them to work, but I'm not going to swear that this is a "proper" explanation. Hope it helps.

 

[xxninja]

your car should idle alot lower for sure, that usually has alot to do with the IAC setting being off.

my car idles at 750-800 nicely


perhaps you got a nasty vacuum leak? that alot of unmetered air is entering the engine, and making the car run rough.


start that car up and spray some TB cleaner near the Egr Valve, the pipe from the egr to the Intake

spray some Tb cleaner down behind the turbo also.
spray any possible place you think it could suck in air

* throttle body to turbo gasket,
* Maf Pipe to turbo,
* turbo to intake adapter

see if your car revs up and down, if it does you found a leak..



didja make sure your IAc was set while warmed up and in gear?