P0303 CODE ???

by **facevedo17** » Fri May 30, 2008 9:11 pm

Ok ive been going back and forth with the shop that did my exhaust , and Tuning with Safc2 , Today I got the P0303 code Cylinder misfire , and car was fine all week , My wideband shows im extremely lean at low rpms all the till I punch it then im around the 11. Afr range .....car does feel faster but I wonder if I should have it tune at Dyno instead of street tuning it ...
I have jim's fuel mod , 190 pump , I also think cleaning my Maf sensor might help .....Im a lil lost in what to do about it ...Help...anyone what do you guys advised ....

by **JavaJoe_2** » Fri May 30, 2008 9:32 pm

What is "extremely lean", what's the gauge showing?
When you are at idle, you are in closed loop tuning (the ecu overides to get close to 13.7(?) or there abouts). Nothing you can do with your SAFC2 should affect that. The SAFC2 is only for open loop tuning (I believe).
How did you go about street tuning it?
Have you tried to reset it back to the setting before you street tuned it?
Otherwise, it sounds like a coil pack, wires or plugs.
Also,make sure you have no exhaust leaks while trying to tune. This can affect your o2 sensors.

by **facevedo17** » Fri May 30, 2008 9:38 pm

Extremely lean even at crusing speed it reads 13 and even up to 15 teh wideband jumps around ..and when im Boosting and Rpms are over 4k wideband goes to 11.ish .....

exhaust leak ? never thought about that , but if it was wouldn't it gave me a code aswell ?

I was in rush today , Tomorrow I will look into it in depth ...I hate CEL thanks

by **Dawgz** » Fri May 30, 2008 9:49 pm

Reset ur SafcII and see if u still have the problem, if the problem goes away then it was ur tuning of course.

Clean the MAF in the mean time like u said, that might help. Did u check to see if u got the spark plug wire order correct? did u have any problems after u installed the fuel pump?

and for tuning, i suggest u go to a dyno shop and have them tune ur car rather than street tuning, unless u have done it before and have a good idea what u are doing.

GL

by **JavaJoe_2** » Fri May 30, 2008 9:50 pm

facevedo17 wrote:Extremely lean even at crusing speed it reads 13 and even up to 15 teh wideband jumps around ..and when im Boosting and Rpms are over 4k wideband goes to 11.ish .....

I think that's normal. 11ish is rich but I'd rather be rich then lean. From what I've read 12-12.5 is the Golden number.

facevedo17 wrote:exhaust leak ? never thought about that , but if it was wouldn't it gave me a code aswell ?

It shouldn't throw a misfire code, but can affect your wideband/afr numbers.

by **facevedo17** » Sat May 31, 2008 8:20 pm

well guys this what happened ....we didn't clean the Maf like I said I was ...we checked the spark plugs . the three front ones and they are good . we reset the Safc ,,, and retuned it ... we where only able to tune the High throtlle seetings and for some reason when we try to change the Low throttle settings it wouldn't let us in ...one of the codes that the CEL was setting was the 03000 ones I mentioned before with cylinder misfire and the p0171 system to lean all this at idle ...
I cleared the code ..... could it be possible I have the vaccum hoses set up wrong ?car rides great dawgs we might need to meet one day maybe you can help me out ....

by **Eye8Pussies** » Sun Jun 01, 2008 12:57 pm

when you are cruising, the car is in closed loop and you should be at around 14.5-15 as the ecu continuously adjusts the fuel trim to stay stoich

at what point are you running lean? at your initial hard throttle from cruising?

as for the exhaust leak, only a pre-cat exhaust leak will affect your wideband display- and it will always show leaner than it actually is

as for changing the low-throttle setting, what do you mean that it won't let you? the low throttle setting is just to help the safc tune when your throttle is inbetween the low and high throttle, as it then graphs in between your low and high settings

as for the actual codes themselves, the lean code can be from a number of things- first clean your maf, then check your o2 sensors. also, any vacuum leaks at all? weird idle, etc?

and for the misfire code- that's could be from a number of things...but it is from too much fuel, which causes misifre usually. either from a faulty injector, or the ecu compensating for the lean code by dumping fuel...

I'd recommend you figure out the lean code first and then go from there

by **Dawgz** » Sun Jun 01, 2008 2:20 pm

first off, ur low throttle settings should remain stock, as u dont usually have boost at low throttle and adding or removing fuel is not needed...unless maybe u have crazy injectors.

The high setting is what u need to get tuned.

this is how im running mine.

by **Eye8Pussies** » Sun Jun 01, 2008 3:32 pm

^ I have to agree with vik on this one as well.

unless you are running high boost and running out of fuel, or if you're running bigger injectors, the low throttle map at 0% will be fine. it'd be a good idea to do so to help trouble shoot

by **facevedo17** » Sun Jun 01, 2008 6:51 pm

no im running stock boost ...pully says 3.2 but but Boost guage shows 3psi so I guess I have one of those old ones...
looking thru the initial setup on the Safc ...
I notice Vik is set up this way ...
Sensor Type = Hot Wire

Sensor # = 12 in & 12 out

Sensor Cal = 1 in & 1 out

Car Select = 6 Cyl (up arrow)

Mines is the same but instead of up arrow I have the two asterisk .....???maybe it was the tunning ..if anything I should be running really rich with the mods I have ...I will take some time this week and go thru all these scenarios and see what helps

But def thanks guys for making some things a lot clearer .....

by **CamryOnBronze** » Sun Jun 01, 2008 7:14 pm

^ that could be it, for sure make sure that arrow is the up one...

by **Eye8Pussies** » Sun Jun 01, 2008 9:37 pm

even if your boost gauge only reads as 3psi, keep your eye on it when you're at the top of 3rd gear and 6500rpm...quite often, under normal circumstances, that's the only time that you'll EVER hit full boost (i.e. full load, full throttle, full rpms)

as for the settings....make sure that it shows the up arrow, as it tells the safc that the signal changes from the maf are increase... I had my MAF type set to hot flap before by accident and well....let's just say that it can blow stuff up lol

as for your fuel upgrades...what do you have exactly that would make your run super rich?

by **facevedo17** » Mon Jun 02, 2008 7:07 am

I have stock boost , Jim kit and urd fuel pump on stock injectors I would think mainly the Fuel pump ...I thinkkkk.... Ill

by **CamryOnBronze** » Mon Jun 02, 2008 7:23 am

^ I know mine was running pretty rich after we installed those two things and we had to pull some fuel out with the safc, so that would make sense that you could be running rich after that.

by **Eye8Pussies** » Mon Jun 02, 2008 9:11 am

^ what are your safc settings like, damon?

because I know that you had to pull fuel after your fuel pump, but was that pull fuel off of the base 0% map, or pull fuel off of your pre-pump tune?

because there's a huge difference between the two...

the only real tune experience that I have personal knowledge of is vik's tune, which, after all his fuel upgrades still needs a whole lot of addition of fuel on his safc....it's a lot less than his pre-pump tune of +20-30%, but he still needs to add fuel

P0303 CODE ???

P0303 CODE ???

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