Lean problems.

[blk00z28]

Figures in colder weather when I really wanna drive the truck something has to make me worry.. :roll:

Half throttle, it goes rich as normal. I get into it more, and even into WOT it goes lean, I mean like 14.4-15.6 on my WB02. Happens the same with the meth on.

Would a plug change fix this? If so, which one and gapped to what? (remember, I'm in the mid 20's boost and running a good amount of meth.)

 

[sytyguy]

Re: Lean problems.

Tim.....can you verify that the meth is indeed coming on? Remember, your WB wasn't acting right in Reynolds, so I wasn't able to see any AFR values for tuning the chip. I doubt it was that far off however, since I did very little VE-wise @ WOT at the meet. The initial chip had a good bit of fuel removed, so I would expect AFRs in that range w/o meth in the mix.

Sounds like your not getting any meth into the mixture.

Hood

 

[blk00z28]

Re: Lean problems.

Well, I can tell you that when I hit the purge button when I'm at idle, it will drop my AFR by at least 10.

When I drop the truck off at the tint place today at lunch I'll see if its coming on. But its weird, becuase I didnt turn the meth on last time I drove the truck around, got on it a little and the AFR didnt go lean like it is now. Which made me wonder if maybe I burned the plugs. :dunno:

 

[sytyguy]

Re: Lean problems.

I would def check the plugs, but I'd also verify that the meth is coming on via the progressive controller. The purge may work, but it may not get the cut-on signal once you allow it to be self-controlled. Possible causes.....map sensor, map wiring, controller, etc....

HTHs

Hood

 

[Maxtor]

Re: Lean problems.

Plugs are NGK UR5's gapped at 0.028". The tight gap is for the alky/boost. What sort of WBO2 problems were you having? The calibration shouldn't have changed, and that sensor (NTK L1H1) has seen very little leaded gas. On datamaster, what does your stock oxygen sensor read in O2 mV compared to the wideband (under "Target AFR")? If you are really running that lean at WOT then O2 mV will also be very low (probably sub 800mv) and it will be knocking like mad. Datamaster will also be able to tell you if your alky is spraying by looking at your IA temps. It is very obvious when it is spraying vs. not spraying. I would suggest you clear this up before doing WOT blasts.

 

[blk00z28]

Re: Lean problems.

I'm gonna check it when I get home tonight. It wasnt coming on at lunch when I turned it on. I even lowered the "spray" point in boost to like -5 and it lighted up but I didnt see the AFR go down at all.

Mark, I sold my laptop, mostly because it wouldnt hook up with DM. I'm still looking around to get another one (thats another reason why I havent drove it all that much.) Its just running lean thats all Mark. Not that the WB acting up, its just reading lean and I can feel it in the truck when it does.

I'm gonna look into the alky pump tonight when I get home. I did find it odd the other day, there was half a bottle left and the "low alky" light was on.. didnt go off until I topped off the tank.. :roll: So maybe it is just the pump.

 

[bezerk]

Re: Lean problems.

I'm gonna check it when I get home tonight. It wasnt coming on at lunch when I turned it on. I even lowered the "spray" point in boost to like -5 and it lighted up but I didnt see the AFR go down at all.

Mark, I sold my laptop, mostly because it wouldnt hook up with DM. I'm still looking around to get another one (thats another reason why I havent drove it all that much.) Its just running lean thats all Mark. Not that the WB acting up, its just reading lean and I can feel it in the truck when it does.

I'm gonna look into the alky pump tonight when I get home. I did find it odd the other day, there was half a bottle left and the "low alky" light was on.. didnt go off until I topped off the tank.. :roll: So maybe it is just the pump.

i might be completly wrong.. but Alky is not really somthing to tune with on DM (Wbo2).
Methanol is giving you a leaner reading that normal gas,

back your boost down, turn your Alky pump off.. and see what is does at 15Psi of boost.
when i ain't using alky i am around 12.2 WOT. when i switch on my ALky.. O2 reading go way down.