gofastbobby

i have had my new exhaust, which includes a pypes off road xpipe of terrible quality and fitment(i told pypes i would spread the word about their product), and 2.5'x12' bullet race mufflers dumped right before the axle. i assumed that the check engine light would come on after a couple cycle diagnostic cycles. well, it's been two weeks now, i drive the car 14 miles everyday to work, and still no MIL. is this normal?

Modular_Madness96

no thats a bit odd actually.i would use a scanner to see if i was setting off the mil's and for some freak reason your bulb was burnt out.

mutabi

I installed a Pypes O/R x and had trouble fitting it as well. I have a tuner but decided to not turn off the rear O2s just to see how long it took for the check engine light to come on. Well 250 miles later, about a week of driving, it still hadnt come on, so i just went ahead and changed the tune. I was kinda surprised the light hadnt come on.

cliffyk

There are a number of conditions required before the catalyst efficiency monitoring fails, it can take 300 miles or more depending on how and where you drive:[/align][/align]
[*]Minimum 330 seconds since start-up at 70° F (21°C)[*]Engine coolant temperature is between 170° F (76.6°C) and 230°F (110°C)[*]Intake air temperature is between 20°F (-6°C) and 180°F (82°C)[*]Time since entering close loop is 30 seconds[*]Inferred Rear HO2S sensor temperature of 900° F (482° C)[*]EGR is between 1 and 12%[*]Part throttle, maximum rate of change 0.2 volts/0.050 sec[*]Vehicle speed is between 5 and 70 mph (8 and 112 km/h)[*]Fuel level greater than 15%[*]First Air Flow Cell
[*]Engine RPM 1,000 to 1,300 rpm.[*]Engine load 15 to 35%.[*]Inferred catalyst temp. 850° F (454° C) to 1,200° F (649° C).[*]Number of front O2 switches: 50. [/ul][*]Second Air Flow Cell
[*]Engine RPM 1,200 to 1,500 rpm.[*]Engine load 20 to 35%.[*]Inferred catalyst temp. 900° F (482° C) to 1,250° F (677° C).[*]Number of front O2 switches: 70. [/ul][*]Third Air Flow Cell
[*]Engine RPM 1,300 to 1,600 rpm.[*]Engine load 20 to 40%.[*]Inferred catalyst temp. 950° F (510° C) to 1,300° F (704° C).[*]Number of front O2 switches: 30. [/ul][/ul][/align][/align]

gofastbobby

i have driven 600 miles this weekend, mixed driving. i also thought that my SES light my be out, but it is functional at start up. i was planning on getting a tuner soon, but if the SES light stays off, i think i'll wait a few more weeks until i get the gears.

KillaGT

my on and off depend on wat gas im using, some how if im using PB, Shell, Kangaroo, my check engine light on, and if im using exxon, car run better and no check engine light

96GTMustangCT

well thats funny. i had never done exhaust work before and installed shorty headers and my pypes o/rx along with the violator catback system on my car and had no trouble at all lol.

BIGKEV985

I HAVE A QUESTION. I GOT THE MAGNAFLOW CATBACK WITH THE MAGNAFLOW TRU X OFF ROAD MID PIPE WITH THE O2 SENSOR HARNESS AND MY CHECK ENGINE LIGHT DIDNT COME ON TODAY BUT WHEN I STARTED IT TONIGHT IT DID COME ON. DOES ANYONE KNOW WHATS UP WITH THAT. I THOUGHT THE O2 SENSOR SHOULD MAKE THE CHECK ENGINE LIGHT NOT COME ON.

Frostbitten

i had a similar thing happen. i removed the whole egr system and it never even threw a code.

MJH78

I went many months before my CEL came on after prochamber install. I only drive about 250 miles per month though.