DanielD

I've not changed the O2 sensor. I just looked through all the service records for the car and cannot see where it was ever replaced. The car has a set of records back to birth... There's been a LOT of money spent on this car.

blitz928

Me too.

Mongo

Daniel disconnect your battery and unplug your O2 sensor. Reconnect your battery and go for a drive. If it runs better than you have the same problem I do.... The oxygen sensor.

blitz928

Daniel here's the cheapest Plug and Play O2 sensor I've found if you don't want to mess with splicing the universal one on. I just did mine last month with this unit.

http://www.amazon.com/Bosch-13048-Ox...ecc_rvi_cart_4

Shark Attack

Whew!

James Bailey

here it is again..."There's been a LOT of money spent on this car. .." that is not an unusual fact and one that is likely to continue.
__________________

DanielD

Jim, I'm sure your prognotication is true! But you gotta love these cars!

DanielD

Matt & Mongo, I'll do the O2 sensor testing this weekend and will follow up here. I hope that's what it is...

Mongo

If you solve yours and my crimping doesn't solve mine, I'm tossing the O2 and going ROW non-cat. I'll take my chances buying cats every 2 years.

DanielD

Matt and Andy, the O2 disconnect and battery reset seems to have corrected the problem. Yes, it idles fine now with no surging whatsoever. Feels wierd, I kinda got used to it!
Does this PROVE the O2 sensor is bad? Can I just leave it disconnected and cheap out??? LOL

blitz928

So it ran better with the o2 sensor disconnected? Even when up to operating temp?

John Speake

DanielD
Could be O2 sensor or LH ECU problem. Loss of O2 loop function is often an early sign of LH death. With luck your issue will be O2 sensor..... disconnecting the O2 sensor makes the LH default to the mid point of the O2 loop range. The car does not go "open loop", rather "fixed closed loop".

Mongo

Yea I would definitely drive it around and get it hot just to be sure. I did this with mine and it still ran smooth on open loop.

Mongo

I hate that damn oxygen sensor; like I was telling you John, I'm gonna go ROW crazy on my LH if I can't get this fixed.

Sure hope your car is easier than mine and that it really is the O2 sensor.

DanielD

The car was at operating temp, about 170 on the guage. Before, when it was at that temp, it surged like nobody's business.
With the O2 unplugged she was smooth.
As an O2 is much cheaper than an LH, I think I'll swap the O2 out first.
If the LH is bad will the same symptom return soon after the replacement?