Long story short

Had the resignators removed last fall. They were welded onto the pipes. A straight piece was installed in it's place. Since then I keep getting 2 codes.

P1133 Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1-8

P1153 Heated Oxygen Sensor (HO2S) Insufficient Switching Bank2 Sensor 1-B

What exactly does this mean? I was thinking an exhaust leak, but I don't hear any leaks!

Thanks in advance

 

http://forums.corvetteforum.com/show...ighlight=P1153

 

Thanks Slothy,

Unfortunately, my car has stock exhaust manifolds. I don't think the O2 sensors have been moved.

Still looking for ideas what could be causing this.

 

What's a "resignator" ????? You mean resonator ????

You either have ...

* An exhaust leak
* The wiring to the O2 sensors is disconnected from them
* The wiring has been over heated or rubbed and exposed wires are shorting/grounding.
* Contaminated or incorrect fuel (what are you running the car on??)
* The sensors themselves are damaged and need replacement

 

I don't think there are any resonators, just cat's and mufflers on C5's.

 

Thanks

I'll have to get it up on a rack and visualy check. I always run the highest octane fuel I can buy. 97 or 98 octane.

 

What kind of fuel are you buying ... is that E85 ethanol ?????

The Corvette is NOT a Flex Fuel Vehicle. The C5 MUST NOT be run on E85 ...... you can run E10 (90 percent gasoline) but E85 is a "contaminated" fuel. Way too much alcohol.

You may have already destroyed your catalytic converters .... Switch to PREMIUM UNLEADED gasoline immediately. You are at risk of doing serious damage to the engine running E85 ... the fuel injectors cannot deliver enough fuel (E85 has only about 75 percent of the "energy" of gasoline ... so the engine needs substantially more fuel to get a stochiometric burn) ....... your engine is running dangerously lean at high RPM or WOT runs.

Hopefully switching back to Premium gasoline will fix your cats .... if not, each cat at GM list price is well over $1,000.00

 

If Your cats are shot, you might as well put a set of long tube headers with hi-flow cats and x-pipe on for the price of 2 stock LS1 cats. Good Luck.

 

I'm not running E85. I'm not that stupid!

 

Well I'm glad to hear that .... where are you finding 97 octane gasoline .... unleaded ....

I have a couple of sources of 100 octane UNLEADED that I use to raise my octane when I go to the track (to prevent engine damage ... not for better performance) but I haven't seen 97 at a pump.

Well, get her up on the lift and let us know what you find ... good luck ...

 

QUOTE!!! " Had the resignators removed last fall. They were welded onto the pipes. A straight piece was installed in it's place. Since then I keep getting 2 codes."

C5 (any year ) DO NOT have resonators! So,,,,,most likely, you had a CAT removed! That would account for your your issue!

BC

 

Bill ....

You're a GOD ..... that NEVER occured to me .... I just assumed (stupid thing to do) he was talking about his mufflers ...... duh ......

 

Didn't remove the cats. They were magnaf low mufflers. When I bought the car, it had Magna flow mufflers plus the stock mufflers. I added the bypass onto the stock mufflers, then removed the magna flow mufflers 3 months later when the car didn't sound agressive enough.

 

Sunoco

 

And the only "legal" "on-road" Sunoco is the 100 octane.

http://www.sunocoinc.com/site/Consum...UnleadedFuels/

I'd recommend that you either switch to the pump fuel ... or the 100 octane .... and try that for a while ..... the OFF-ROAD formulations are not blended to take the cats into account......

Otherwise .... put the car on a lift and see what is going on .... but I'm suspicious your choice of fuel is contributing to your problem .....if you even have cats on the car.....

The Corvette exhaust is a three piece system ... and no welding is required to replace "parts".

The first part are the exhaust manifolds themselves. Directly below the exhaust manifold is a flange that bolts the catalytic converter section in place. That section runs all the way to just in front of the rear axle. Again there is a flange and bolted to that is the muffler section ... the pipes that climb over the rear axle and go into the mufflers and tthen the exhaust tips.

The Magnaflow systems offer two choices .... one is a bolt-in replacement of the rear muffler section with Magnaflow mufflers (part 15660 ... see http://www.magnaflow.com/02product/parts/15660_lg.jpg ). The other choice is a 2 piece system that requires welding .... one piece is the section behind the cats (part 15437 in above link) which welds to the stock cats or the magnaflow cats (part 93988 .... see http://www.car-sound.com/02product/d...irectfit=93988 ) which can weld to the above magnaflow exhaust or the stock exhaust.

It kinda sounds like you cut out the Magnaflow catalytic converters ..... would explain why you got the codes after cutting out the "resignators" .......

 

Unless your engine is significantly more than a HIGHLY MODIFIED stock engine ,,,,,,,,,,,,,,,,,,anything above 93 octane is a WASTE of money!

If you need more than 93 Octane,,,,,,God bless you! Your in to the 9.000 9.990 time frame 1/4 mile time frame,

BC

 

WOW. It's been over a month and I finally got the car to a garage. I was wrong about the fuel. I've been putting in 93 octane, not 97. I filled up again last week from a different station and still have the same problem.

Anyway, they just called and said the O2 sensors are probably bad, so they are replacing them.

If that doesn't work, what's next? The ECM?

 

The stock cats are still in place. The garage just verified that. The Magnaflow system that was there was welded to the back of the cats. It consisted of 2 approximately 9" dia mufflers, the "X" pipe and that's it. No mufflers were behind the rear axle. When I bought the car, there was a very strong low end noise so I had the dealer install the stock mufflers to quite it up. After driving the car for a year, I wanted more noise, so I did the muffler bypass, which didn't change that much, so I had the Magnaflow mufflers removed and that's when the dummy light started coming on.

Confused. God knows I am!

 

I just picked her up and there's no codes. They replaced 2 O2 sensors and that seems to have fixed my problem.

Now to fix the drivers seat grinding noise when it moves forward.

Thanks for everyones help. This forum rocks.

 

Holy $hit. I'm 2 for 2. Fixed the seat grinding noise by putting 4 turns on the outer rod. She's like new again.