P0303 CODE ???

[CamryOnBronze]

I was on the stock ecu before the fuel pump and jims fuel mod- we installed the safc after the fuel pump. The base dyno with the safc set to zero was rich, so we pulled fuel.

[facevedo17]

Did some adjustment with the arrow pointing up this time ...and by doing so it actually allowed me to change the low throttle setting but i left it at is since I don't need too.. I readjusted the high throttle setting ...my inital 1000k I was at +8 I broughted down to +3 ..
at 2800k and 3k I brought it up to +7 and adding more as it goes into 4k at 5 6and 7 I started to bring it back down ....
at cruising my Wideband now goes from 14 to 17 .

at 3k pushing hard ...wideband read in the 12's before i was reaching the 11's

I reset the CEL but it came back on ...
can i meet up with someone to check it out all my hoses look fine ...fuel pump is working ...

only thing left is cleaning the Maf sensor , and getting tune at an actual dyno .....

[Eye8Pussies]

I was on the stock ecu before the fuel pump and jims fuel mod- we installed the safc after the fuel pump. The base dyno with the safc set to zero was rich, so we pulled fuel.

really? interesting....I've never heard of a gen4 having to pull fuel even at 4psi...but that's a really good situation for you though for sure



as for facevedo17....what do you mean it goes from 14-17?? it should not be going to 17 while cruising.....or do you mean it goes to 17 when you take your foot off the throttle and just coast?

[CamryOnBronze]

yeah after doing the fuel pump we for sure took fuel out, it was running decently rich. It still puffs smoke at redline- everyone at the dyno day was like "ohhhh run rich much?!" and thats after we tuned it to take fuel out...

[facevedo17]

recheck all my hoses .., ground and no mischief ..

I did find that one of my hoses to the intake was not on .. I clear the code ...but crossing my fingers that was my problem ....at least one of them the second was the tuning instead of the up arrow I had the two asterixk in there ...I didn't drive much after I clear the code so won't know till tomorrow if that was the reason ....

[Eye8Pussies]

^ let's hope...and it's quite possible if it's a big vacuum hose, since any additional air after the MAF can cause big problems

[facevedo17]

Drove it this morning to work it was fine the whole way right about when I was reaching work damn light came back on ...I was pissed ashell .....thought that the intake hose might had fix the problem unless it came loose again i will check later I was running a lil late this morning ...

[facevedo17]

is not the intake hose coming loose for sure but after driving a week or so back and forth .....the codes have change somewhat ... when I initially encountered my problem I had like 10 different codes ....last night after some driving and boosting there and there My Cel return ...this time I only had to codes p0171 and p0174 all indicating system lean ...Im sure the Intake hose came loose again wich it did as a matter of fact im gonna have to zip tie that sucker temporarily .
if the weather holds Im cleaning the Maf today when I get home for sure ...

If that doesn't do the trick ...im about to throw money on it like crazy
O2 sensors , new spark plugs ? maybe ignition coils def ....
i have never work on my car so much like now all these would not be possible without you guys ...... all the info on this forum is really helpfull and save me a lot of headaches ...

[Eye8Pussies]

this is the best way to learn about your car


and now only have the lean codes is a good thing...once you throw mis-fire codes in there as well, it's as though they're telling you two different things

as for the intake hose...it is most likely not your problem anyway, since on the gen4s/solaras, the MAF is pretty close to the throttlebody, so the readings won't be thrown off much even if it's right above it.

in regards to what to troubleshoot- clean your MAF first, and if you have another fellow solara owner nearby, swap MAFs and see...

ignition and sparkplugs you can leave, since if they are not working properly, you'd get the misfire codes again and run rich, not lean.

you can take out your injectors and get them flow-tested- BUT since you're getting both front AND rear bank codes, then chances are that it's not the injectors. I would actually check to see the working condition of your FPR by attaching a fuel pressure gauge.

Also, you don't list an upgraded fuel pump on your mod list. do you have one?

[facevedo17]

here are my mods
Sc 4psi , Trd SB , Injen Cai , Jim;s fuel lines with filter, walbro 190 fuel pump , Magnecor Kvm85 wires, Denso Ik22 , Jim t- rod , super bro bushing upper engine mount , Dats y pipe + High flow cat , custom 2.5 with magnaflow exhaust no Resonator , aem wideband , trd boost guage , TWM SS TRD RSB ,

the kid that help me with the installed say after reading the code, all my Lean issues are coming at idle ,,,,when the car is running its a whole new story .

when I turn my car on my Safc reads that my Rev is between 600 and 700 hadly ever does it get to 800

althought at start up is usually a lil over 1k then it starts to drop ....



YOU mentiones FPR do we even have one in the gen 1 solaras ...??from what I read I dont' think I do

[Dawgz]

the idle rpm u are seeing are normal, it should be around 675 - 780ish


also, our fpr is in the fuel tank, right at the fuel pump housing, its non adjustable, but some have adjusted it by "crushing" the fpr unit so it allows a higher psi...but i wouldnt do that lol...

[facevedo17]

clean the sensor today took it for a drive and the cel again , its a pain in the butt ...

3 codes now ....po171 ,po174 , po3000

the misfire came back ...I don't know what else to look for ........

Let me add also that when I did my exhaust ...and funny I mentioned this and just realize it ..are any of you guys with aftermarket exhaust have a O2 sensor on the piping itself ...if so I beleived solara factory setting has two I don't have any of them could that be a reason ..also
My wideband sensor is reading right at the Y pipe before the cat ???just thought about these...

[Dawgz]

if u have a federal spec car, u will have an o2 sensor on the front header, and one on the rear header. Then, u will have an 02 sensor after the cat maybe...3-4 feet from the cat? should be on the midpipe.

If u have a Cali spec, the only diffrence is that the sensors on the headers are Air/Fuel sensors instead of o2. but the one on the midpipe is still an o2 sensor.

[Eye8Pussies]

do you have a clip of your car at idle?? it doesn't stumble or sound weird??

the codes that you are throwing- ESPECIALLY the random misfire, and the fact that when driving, your car is fine, and you're only lean on idle....are classic symptoms of a MASSIVE post-MAF vacuum leak.

spray some carb cleaner or throttlebody cleaner around the engine bay around vacuum hoses and gaskets and see if the engine revs go up

[JavaJoe_2]

Personally, I would eliminate the SAFC and then go from there. It should run just fine without it.