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Discussion Starter · #1 · (Edited)
I was out cruising along in my 2002 Z06, doing about 35 mph in town, in third gear. Car was warmed up, as I had been running errands for about an hour or so. Anyhow, as I was going along, barely on the throttle, the car started to surge and buck. Reminded me of a lean surge I used to get in my 1970 442 if I was in too high of a gear at lower speeds. The car stopped doing it on its own accord after about 15 seconds, but about a mile up the road, it did it again. I downshifted, but even at the higher revs in 2nd, it started doing it agian. The stumbling got so bad that I thought it might stall, as I pushed in the clutch and came to a red light. The tach needle and HUD tach were flickering.

I pulled into a mall parking lot, and the car was idling perfectly smooth. I turned it for home, and got on it a few times. The engine pulled VERY strong, as usual, with no hesitiation whatsoever. Gas in the tank was 94 octane Sunoco Ultra, from a station I visit regularly. Weather was sunny and 85 degrees, very low humidity. Car was not running hot, oil pressure and charging volts were normal the whole time. I got home and had no codes when I pressed on "options" button.

Any suggestions?

Thanks,
Scott
 

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Scott, go to the owners FAQ

<---------Over there

and follow the directions for retrieving the codes and let us know what you have......that's weird......

JC
 

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Discussion Starter · #3 ·
N4C5S-
I got the code readout via the options/fuel buttons, and for all modules, there were no codes, either current or historical, of any kind. Car has about 1600 miles on it and has run flawlessly until today, and this was really more annoying than disabling. Still my wife does drive the car quite a bit, and I don't want her to have any trouble with it out on the road somewhere. Maybe C4C5 Specialist can help
:yeadog:

Scott
 

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Discussion Starter · #5 ·
Update on the situation

Guys,
Here's an update on my 2002 Z06:

Took the car out for a ride today, easy cruising, car ran great for about a half hour. Then the same surging and bucking, car back fired, then a few miles later the car stalled out at 65 mph in 4th gear. I shifted into neutral, restarted it and it stalled again, then again, finally stayed running on third try.

Problem seems more prevalent after a minute or so of steady cruising in any gear. Problem seems to go away under moderate/full acceleration.

I suspect the car is running rich, either due to ignition problems or excessive fuel.

Unlike the ifrst time, this time the car thankfully generated some codes. They are
BO-RFA U1000 H C
and
10-PCM P0336 C

The first is described as "Loss of communication undertermined RFA"

The second is described as "CKP Sensor Circuit Performance-A"

Can someone with a shop manual please look these up for me and tell me what gives? It's off to the dealer on Monday....

Scott
 

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Sounds like dirty gas or a restriction in the fuel line. I would say the fuel filter was clogged if it didn't have so few miles on it. Definitely get it to the dealer!

JOHN
 

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Discussion Starter · #9 ·
Another update

The Z went to the dealer this AM. Got the call later today that the problem had been found. A wiring harness had melted against the right exhaust manifold, wiping out the crank position sensor wire, as well as the oil level sensor and a ground wire.

So, all of you fellow 02 Z06 owners out there, look around your right exhaust manifold and make sure the wiring is clear.

All wires were replaced or repaired and I went to pick up the car.

Lo and behold, there were MANY scratches in my clear coat all over the right fender up near the nose piece. I was, of course, rather annoyed. The service manager saw the look on my face as I was looking the car over, and came out on the double. He took one look at the car and started to apologize, telling me they would polish it out tomorrow morning. I'll be there in the morning to check out the car more thoroughly and "supervise" the repair.

Give me a gold star for not freaking out....yet
Scott
:mad: :mad: :mad: :mad: :mad: :mad: :mad:
 
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