I was driving my Hybrid (92 RS/02 LS1) around earlier and it ran great for a while then started spitting and sputtering like it wasnt running on all 8 cylinders. When i go tit home i pulled the plugs and all the passenger plugs were black as the Ace of Spades. what gets me though is all the drivers side plugs are OK. they dont even have the slightest bit of build up on them. any ideas? Could it be the passenger side 02 sensor?

Car has longtubes, rear 02's deleted and Tr224 Cam if that helps.

 

Heres a Pic..........jt

 

coilpack unplugged?

 

That was my first thought so i checked it right away, everything is plugged in and nothing looks to be out of place. I also checked any wires that may have found there way onto the header but none are burned............jt

 

Just changed the oil, i can definately smell gas in it.... It went from running great to running that poor in a matter of 15 minutes of driving. There is no way all 4 passenger injectors are faulty. I am tempted to go buy another 02 sensor just to see what happens. Any Ideas? Anybody? I tried a search and found a few people with similar problems but it was either the coil pack came unlugged or they never posted what they found out was causing it.....jt

 

Check the fuses. Each set of coil packs has it's own fuses. I blew the passenger side coil fuse and it was running barely worse than stock, due to the firing order, but would stumble when revved. The O2 sensor sees all this unburnt AIR coming through and dumps more fuel on it.

You have to remember that the O2 sensor reads air, not fuel.

 

You need to get a scan tool and log LTFT1/LTFT2 and HO2S11/HO2S21;

These will show you if you're running rich on bank 2 (passenger side) and if the O2 sensor is switching;

If you have an exhaust leak on bank 2, it could be sucking in air and fooling the O2 sensor into "seeing" lean, which causes the PCM to ADD fuel on that bank (and LTFT2 will shoot positive);

Or your O2 sensor might be bad.

 

I've been fighting the exact same issue for over a week. I haven't fixed it yet and today finally got a MAF code. Put on a buddy's MAF but that didn't help either. Have you had any codes? I'm gonna try what blur said about the coil pack fuses if I can find them.

 

It was in the fuse box toward the driver side headlight, top left IIRC.

 

I don't have anything labeled with coil or ignition that I can see there. Where are the possible sources of vacuum leaks everyone keeps suggesting?

 

Its a Howell Aftermarket Harness so its set up a little differnt then stock ls1 set ups, i did check the fuses though. They are all good..........jt

 

Yeah, Thats the next investment. No exhaust leak that i can tell, atleast if there is one it shouldnt be bad enough to make that big of a differnce.

 

Had you done any recent mods to it before it started or was it just random. Mine hasnt been driven long after getting everything put together. I did a Cam swap, longtubes, asp pulley, no cats, deleted rear 02's, custom CAI and several other things prior to putting it on the road. It ran fine once the idle was relearned up until today. Out of the blue it started in downtown traffic. Temp guage was about 180 degrees and wasnt running hot. Engine light did come on but i dont have a scanner...........jt

 

I had just changed plugs and battery before this started. I will put in new plugs tomorrow and see what happens.

 

Working fine, then instantly taking a crap sounds like a fuse to me.

 

Those 4 plugs are carbon fouled, which means they are firing, but the mixture is overly rich.

 

Now that makes sense!

Doh!

 

i'm gonna have to vote for an O2 sensor. i don't see what else it could be if it's not a coil pack and not a fuse, it's gotta be an O2, at least i would think so. either that or maybe one cat is clogged and the exhaust gases can't get out the passanger side quick enough and are blackening your plugs? are you feeling a big loss of power? if you do it could be your cat went. do you even have cats

 

All the fuses are good, I dont have Cats. Just Longtubes into the Y-pipe. I think I'm going to go buy two Bosch 13111 02 Sensors today and see what happens. Guess I'll look at the price of some scan tools while i'm there too....jt

 

good luck. if i had to bet money, i'd be it was the passanger O2 sensor.