I was coming home from campbellton tonite . got on the highway...and then the service eng soon light came on...the car was choking and hesitating..i figured id stop and check it out..when i shut the car off..it smelled like rotten eggs...when i turned hte car back on the prob was gone..and did it again about 1 hour after...anyone have any clue as to what this is??

rotten eggs?

oxygen sensor...

i just replaced this about 2 months ago..do they go often...i used a bosch one from canadian tire..ill dig up the receipt and change it to see..seems to be working ok now..just highways and high speeds

They are not supposed to go often, but when dealing with Bosch you never know. Stick with AC Delco. OEM parting is usually the best way to go

If the SES light came on, retrieve the codes and tell us what code numbers you have.

Oh ya, darn right Don, Code 41 (cam positioning sensor) is the worst. Hey Bonnieboy if you notice that your timing is out consitantly, your lookin at a broken cam magnet. Hopefully its not and just a minor O2 thing :?

its been a week and it hasnt came on again... what is a code 41, and what is the cam sensor for...must be expensive its its dreaded..

Don't be afraid of the doctor. He is only going to help you get better.

I'll give you the down low on Code 41: Cam Postioning Sensor.

Usually if this code comes up, it indicates that your cam shaft is not in the proper position to properly fire up your engine. A cam magnet located within the system properly aligns the cam shaft when the car is energized in order to ensure proper firing sequence. It is common for older VIN c 3800 engines to have the magnet break away. The resultant is the cam sensor is not longer locating the cam magnet and thusly not aligning for proper firing seqence. When this happens, the car may experience a shuddering and stutter feeling when accelerating or cruising.

It is so expensive to fix because it is labour intensive. In fact the dealer told me 5hrs, they pull out the cam, replace the sprockets, replace the cam position sensor, replace the magnet, replace a gasket cover or something (Don will correct me... ) and lastly replace your timing chain.

My cam magnet is being fixed tomorrow. I know for sure that Don (Jrs3800) and Merlin1 have gone thru the same problem....both with different results, Don fixed it himself with the aid of a friend with air tools and Merlin1 had his 3800 totally replaced with modified heads or something, beefing his engine up to a stock 180HP...lucky punk

Since I don't have power tools, resources, or the time to drive down to Florida to have Don fix it...lol I have to shell out as much as $1400 beans....

well, this morning is judgement day..if it is the code 41 (dreaded) ..then i wont renew my insurance and tear the whole car apart..i want to get underneath, take all the peices off..sand any rust whatsoever and paint it with black rust proof...boat paint...that ell keep the rust of her for a while...as for the inside...i hope its not because it will put me back some...:(...let u guys know when i get home from the garage.