Hi,

(this is a 2001 Z06)

While I was at Thunderhill Race Park for performance school, my Check Engine Light came on during the first warm up lap. Then started to blink. This has happend before and Chevy replaced two Fuel Pumps, PCM and even a Starter (they broke off one of the nodes accidentally) to solve the issue.

Fortunately for me I guess, the instructor in the car with me was an experienced mechanic, spending the last 10 years fixing GM cars. He told me to pull into the pits, stop the engine and start it up again and see if the blinking Check Engine Light and rough running continued. Started right up, and the Check Engine Light stayed solid, in fact it went away as the day continued.

He told me not to worry about it, just pay attention to all the other gauges and listen to the engine. We continued on our merry way and had a blast the whole day! Saw some interesting stuff, and I heard, a record number of Black Vettes were there on Sunday.

But that's another story, any suggestions? Think this guy might be on to something? also, another weird thing popped into my mind, my security light stayed on the whole second session, only going off when I pulled into the paddock area and shut off the engine....

No mods what-so-ever....thanks!

 

I didn't think the C5s had an EGR valve :confused:

Jerry

 

Ok....strike one against that theory. ;)

 

O2 sensor might be going bad. Did you run different fuel that day?

 

Frisky,

No, ran 91 Octane, got stuck with it!!!

I'll take it into Chevy, and hint that it may be the o2 sensor....thanks!

 

Pull the codes from the computer, and you should know exactly what the problem is.

Same happened to me, and it was oxygen sensors.

-ag

 

Thanks antigrav,

I went downstairs and pulled these codes:

P0200H (from PCM)

B2721H (from BCM)
B2723H

....BCM codes probably showed up when I was at the track and during one of the sessions, the Security Light stayed on solid for some odd reason. Went back to normal after I shut off the engine and let it sit for a few minutes when I got back.

Anyways, thanks guys.

-Tony

 

Looked up the BCM codes:

B2721H=Pass Key Detection Circuit
B2723H='same as above'

No biggie, probably dirty key or something....

Now, the P0200H code, I could not find.

Seems to be in the range of the Fuel Trim System codes and the O2 Sensors, but could not find a specific code listing what P0200 is....The car did smell a little rich when I pulled into pit lane to stop/start the car up....so looks like the O2 sensor after all. Thanks guys!

ps. Anyone know what an O2 Sensor does (basically, so I understand), and why it would cause the car to run rich? Thanks!



[Modified by Rebelskum, 6:22 PM 5/8/2002] :smash:


[Modified by Rebelskum, 6:29 PM 5/8/2002]

 

The oxygen sensor measures the amount of O2 in the exhaust gas. The amount is proportional to the ratio of fuel to air fed into the engine. Output from the sensors is fed to the computer so that it can regulate the fuel/air mixture dynamically.

I'm not an expert, but if the sensor fails, or is failing, then the computer probably falls back to some default settings which aren't as optimal.

-ag

 

Hmmm...ok, got it...thanks ag!

These cars are getting pretty complex! I love it!

:crazy:

 

The po200 that your computer set is what was causing your engine to misfire. This code pertains to an injector driver circuit. I have seen this a few times. What happens is that the injector harness rubs on the fuel rail and causes a short to ground on #7 injector causing it to constanty stay on. Check the injector harness as it comes around the fuel rail. The problem is probably between the #7 injector and the bulkhead (firewall). You'll probably find some chaffed wiring contacting the rail.

jason :blueangel:

 

Ok Jason, I'll have to look into that after work, would be interesting if that's what it is. Will check tonight, let you know tomorrow what I find, thanks!!!!