cel help please - Page 2

g4ebguysite · 06-23-2009, 04:09 PM

Ive already answered your question.

The 02's are fine.... the 02's work with the cat to make idea fuel and air mix.... the reason your having these problems is because the computer is trying to pinpoint the problem but there is no problem... its your fault...not the cars.... hint it is hunting for something not there.....

If u put the cat on it will go away without the cat... there is no solution.

Izapyou · 06-23-2009, 04:58 PM

ok so if i get a cat in somewhere before the second 02 then the code will go away. huh, wow its so weird that the car has a problem now with the missing cat after 2 years i guess you never know. so is a high flow ok with the hyundai obd2 system or should i get a more restrictive stock type cat welded in? thanks for the advice so far. by the way the wiring isnt an issue with the results ive gotten, and too hopefully this ecu will leave me alone.

g4ebguysite · 06-23-2009, 05:04 PM

its possible when u were fooling around with the 02 you left the key on... and even though the 02 isnt the problem the computer may have stored the code....

all in all not having a cat should deff through a code no matter what....

u might as well unplug the sensors if u dont have a cat. Cuz there there just for emissions. All it will do is richn the mixture. Like i said i would just leave it alone.....now the MAP could be the result of the 02's also...but it could also be a couple things...intake leak....resistance in wiring... bad MAP sensor.... but i pretty sure its cuz the 02 readings..

Izapyou · 06-23-2009, 06:18 PM

alright im going to find an universal cat to fit my size limitations tonight and hopefully that fixes it. with the map i got a new hyundai map a while ago and it did the same thing. when ive had that code problem come up is when i delete the code while driving but if im parked it wont come on. its only done it like 3 times. no big deal im trying the cat hopefully this fixes it. thanks for everything after the cats installed ill replace the 02s again up and downstream and see what happens. also get the bolts impacted on. im doing the rear flange gasket again if i feel a leak. dont worry about exhaust leaks right with the front flange gasket?

Izapyou · 06-23-2009, 06:55 PM

quick question if i add a cat the 02 wont fit, but if i increase the length of the harness will it affect the 02 sensor?

**thegrim** · 06-23-2009, 08:07 PM

Keep it simple guys. your getting an 02 sensor slow response CEL... did you try just simply changing the sensor? (not reading thru ur entire thread). If you have tried changing the sensor, put your stock header back on and drive it thru a few cycles. if the light comes back on, then go from there. If not, you know its the header and an aftermarket cat wont be any helpful to the CEL.

**thegrim** · 06-23-2009, 08:10 PM

Quote:

Originally Posted by g4ebguysite

The convertor would go before the downstream but after the upstream....so like right after the flex pipe. if u dont have a flex then right off the header pipe or a inch or 2 down more. I woul djust leave it off..... U deff get better performance without one... they are a large restirction.... Il use the delorian as example.....it made 170hp with no cat and that was good back then.......they put a cat on it so they could sell it in USA.... went to 140..... it made one sad car to drive i bet.

The Back 02 usually doesnt change much... it likes to stay close to a range..... and the whole point of the rear 02 sensor is to measure catalyst effieceny but with no cat it will go crazy and think someting wrong.... the front one will then be saying MY COMBUSTIONS 02 is perfect mUTHA FU**** and the rear would say *sorry sir no its not* and then all hell breaks loose.... the injectors throw as much fuel in as possible... increasing exhaust temps...the CAT blows up and shoots shrapnel through your oil pan.... releasing your synthetic oil....which then starts to not lubricate the cam......as the cam turns and turns it locks up and the cam gear shears off..... then the piston comes up and hits your valves bending them actually makeing a backfire through the intake which blows off your short ram through the front fender....hitting a police car.... not to mention a rod went through the block and hit your subwoofer power wire.... shorting it... which then blew your amp and subs in a wiff of smoke because u didnt put a fuse on the power wire... after all that u put it in park after moving 2 feet out of your driveway.

wow.... shrapnel from a cat?

sounds like someone is going thru tech school....

g4ebguysite · 06-23-2009, 08:27 PM

hes changed the 02's and the MAP.... so its deff because of the cat... no other excuse

Izapyou · 06-23-2009, 08:39 PM

omg ive changed everything except put a cat back on the car. i think ill put the stock back on if it costs to much. idk i found a cat around 35 bucks but i have to then increase the 02 harness for the downstream 02. so if i went that route would it hurt the downstream 02 with its voltage span and it have a circuit slow response?

g4ebguysite · 06-23-2009, 08:53 PM

it is deff possible to mildly alter the 02 becuz of that.... but probaly not much...because its a low voltage and VERY high resistance. So.... what u wanna do the best thing to do.... is when u put the cat on.....when u wire the wires together try to use a heat crimp connecter... it shrinks and makes a very tight connection.... also the next best thing is when u twist the wires together crimp them on the same side as each other not on both ends of the crimp... also might as well tape the whole wire harness to the 02 sensor....or at least the portion under the car that will be exposed.