P0068... Why?

SoCal Redline · 06-09-2006, 11:09 AM

I am running a 3" pulley and plugs. I ran the pulley for 5k miles or so before changing the plugs. Installed the colder plugs now I keep throwing P0068, along with limp mode, when under hard acceleration (MAF Sensor/Throttle Position Correlation).
Any Ideas?

**Sp00ner** · 06-09-2006, 11:11 AM

Does it stop if you put the old plugs back in?

SoCal Redline · 06-09-2006, 11:16 AM

You know I haven't tried that. Its an idea. Find out this weekend.

**Sp00ner** · 06-09-2006, 11:27 AM

There's a discussion I've been having with some HP Tuners owners. The car has a table that describes how much air it will take in for a given rpm and such. The Volumetric Efficency (VE) table. Now typically, this is what a car will use with it's MAF sensor fails. Remember Alpha talking about removing his MAF sensor and he could drive around?

I think, the MAF sensor, the Throttle position, and the VE table is what's being compared to set that code, which causes limp mode. I started getting the P0068 when I dropped to the 2.8" pulley. Also, I notice in HP Tuners that my actual MAF values are quite a bit higher than the VE table predicts they'll be by 5500 rpms. When it sees the car taking in 'too much' air, it thinks there's a problem with the car. Since it thinks there should be this much air coming in, for this throttle position, something is wrong. In this case, nothing is wrong, but it's a pass/fail system.

None of that really answers your question though! I've actually turned off the P0068 code on my car everyone else who I've 'tuned'.

SoCal Redline · 06-09-2006, 11:33 AM

Actually that makes alot of sense. It may just be the reason this is happening and the changing of the plugs was just a coincidence.

**socalsilverRL** · 06-09-2006, 11:34 AM

Why don tyou cruise to the BBQ on saturday at smokem10's (Rocky) house and we can help you figure out what the deal is

SoCal Redline · 06-09-2006, 11:53 AM

Well I need to do some house hunting this weekend, but it might work. Where?

**socalsilverRL** · 06-09-2006, 11:55 AM

Here ya go:
3305 Spruce St
Lake Elsinore, CA 92530

**socalsilverRL** · 06-09-2006, 11:56 AM

Youll find more info, names/phone numbers, in the Southwest forum...

mgm1979 · 06-09-2006, 11:59 AM

So Spoon, if we can adjust the VE tables, then theoretically, we can tune for the increased airflow from the K&Ns and see the REAL gains, huh?

Socal - the more the merrier...removing a S/C, possibly TWO intakes, maybe a third now...

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