After many feeble attemps to tune out the P0300 I finally broke down and converted my map to the 94170015. I am kicking myself for not doing it sooner. The car runs great and no more dang p0300. YEAH ! !

I would like to know a bit more about the lean spool though. I didn't have that in my old map. Everything i read says it "artificially" leans the mixture to enhance spool and everyone states I should disable it.

What are the advantages to disableing it other than more closely following my WB?

Couldn't it be used to enhance spool even more?

OH and I have the FP Green on stock cams if that makes a difference.

Paul

 

I run the 94170015 and I have the p0300 coming back again and again. I can't freaking figure it out, it doesn't feel like its misfiring, and it seems to pop up during idle.

On that lean spool note, I have no clue.

 

Steadly try reducing the timing on the "Boost enhancement adv/ret map2 (antilag)" and lower the AFR on the "Boost enhancement enrich/enlean (antilag) map". On the timing you will notice a block where the timing is incraesed and the rest of the table is 0, you can just 0 out the whole table or lower the timing 1 degree at a time. On the fuel table you will see a block that is above 14.7 and the rest is at 14.7, change the whole table to 14.7. This is not a guanranteed fix, but it has worked before.

 

Thank you, I'll try this out!

 

Even lower you main Idle timing in your High Octane Ignition Map

 

I've just done both, zero'd out the lean-spool and dropped my idle timing from 7 to 6. I origionally upped these because the ROM that came with my car idled at 10* timing, and the stock EVO ROM was at 5, so I kinda just split the difference. We'll see how this works out.

I'll report back after testing these settings out a bit.

 

Just an update, I did the two mentioned methods above, plus changed the spark plugs from old iridiums to cheapo coppers. I deleted the code and drove around for a while, it hasn't come back. We'll see if it stays gone.

 

I'm glad to see that my screwing around with the boost enhancement adv/ret table has helped out for p0300 issues. I was met with a lot of cynicism when I first mentioned it and I'm really glad to see that people are having good luck with it. That particular table is mis-labeled, and from what everyone can tell it's more of an egr timing advance than having anything to do with boost. I really wish they'd sticky the info up though, would probably save alot of people the time to search. Good luck with it!

 

Hey, it seems my turbo spools much faster for some reason, and I get less knock during spool on the highest gear.

But, unfortunately my code came back today. I think it was because the temp was really cold. I dunno. It stayed away for like 2 days, then popped up after the warm-up during a cold morning. All in all, I love the difference without the lean spool, but still getting the code. I wonder if its because when it was cold I was in a different load area, causing higher timing during the idle? I dunno... suggestions are welcome!

 

My P0300 is gone. I didn't mess with anything on the accel enrichment or boost enhancement maps.

Would someone dive into the coding and figure out exactly what these maps are for? There sure is a lot of confusion.

Paul

 

Do you have larger cams? If so, what size? I found with my 272's the best settings in the boost enhancement table was only about 1/2 of what the original values were to keep the p0300 away, and I also left the lean-spool on just because I never really had any issues with it. There's another few things that will trigger a p0300 code, such as the plug gap too large, or the one I found the hard way...crank position sensor. If there is any debris or light metals shavings clogged up in that sensor it throws the signals way off and will trigger a misfire all day long even when there isn't any. I would suggest checking into that too, although it can be a pain to get to with all the covers and belts in the way.

 

They're not really that confusing, the accel enrichment map as it's been explained to me is supposed to act like an accelerator pump on a carburetor, and the boost enhancement map is just mislabeled...it should be an egr timing advance that facilitates emissions. That's why larger cams have such an impact with the p0300 due to more exhaust gases being sucked into the combustion chamber, resulting in higher knock counts and higher misfire rates.

 

So if this is the case I should zero it all out to get the best possible power. I have an EGR block of plate that I have not installed yet. I suppose I should do all of this at once...zero it out and install the plate.

Another questions kinda off topic.....there are water passages in the throttle body. I cannot for the life of me think of a reason to have them there. I suppose in ultra cold climated it could be necessary. Am I OK to take the lines out of the throttle body?

Thanks for your help.

Paul

 

Yea, well I have a larger cam. My 2.4L is a SOHC. I don't know how large it is compared to the stock evo cams, but its larger than the stock SOHC that came with the motor.

I just assembled everything onto this motor, not including internals and I can say for sure that it was clean when I put it together (the crank position sensor).

And ever since I disabled the lean spool I'm not getting the random knock when I'm on the freeway and gently add throttle until it begins to build boost, like going up a slight incline. I used to get knock everytime if I wasn't accelerating, but now its gone. I think the only time its throwing this code is during idle and cold weather. If the motor is warm, or if the weather is warm it doesn't seem to do it.