Hey everyone! Just finished switching out the old plugs in my '03 Bonnie with some Bosch plugs and some B&W wires I picked up from my local Checkers. I was amazed at what a difference this minor change made!!!!

I have read a couple of msgs in here that recommend NGK plugs and I would like to try some irridium tipped plugs and some hi-perf wires but am short on the financial side for all that I REALLY want to do to my ride.

Back to the change....aside from a little scare due to having put the wires in the wrong order, the only negative change to the car is that the service engine light is on now and I think that'* probably due to the O2 sensor noticing a change in the fuel/air mix. On the road though, my car just seems to BEG for me to feed it more gas so that it can keep going faster!!!! And it picks up speed with no hesitation! At cruising speed, the tach stays steady so I anticipate some noticeable fuel economy if I can keep from lead-footing.

While I'm sure your Bosch plugs feel great today, they have a bad history of early failure in our experience. We typically warn people to stay very far away from Bosch plugs, wires, and O2 sensors.

I myself am a victim of a Bosch O2 and Bosch plugs. And I'm only one of many. Keep a close eye on them. In fact, I suggest pulling them in 30 days to be inspected.

Glad you did your tune up. Your car will almost always thank you.

A couple things for future reference. Keep a good eye on the Bosch plugs as the Bonnevilles often do not like them too much. Many here have had issues with them after a short time. Not everyone though, so just keep a good eye on your mileage and performance.

Also, The NGK55s can be had for probably the same or less than Bosch plugs.

Regarding the SES light. If it doesn't go away very soon, have it read at your local AutoZone or Advance. They will usually read the code for free. If you do, make sure you write down the code number and any other info you can get and post it here.

Just as a quick check, look in there and make sure that the #6 plug wire is not too near or touching the O2 sensor or it'* wire. That can sometimes throw a code.

Again, glad you are looking after your car. you will never regret doing regular maintenance.

Congrats on the tune up.

The check engine light was most likely caused when the wires were crossed. An easy way to keep from ever crossing a wire is to only change one wire and plug at a time. That way there is only one place for each to go.

Removed, until I find out confirmed information.

DaveSSEi, please do provide real info if you can find it. We don't want to be falsely scaring people or passing on unfounded rumors, but are interested in any concrete information you can provide.

Okay. I plan on working on finding the info. I'll post anything that I find out.

Hey guys! Thanks for the info on my post....glad to be able to say that to date, no problems with the plugs yet. SES light did go out the next day, and it must have been caused by placing the wires in the wrong order. What I'm doing now is putting on some slotted brake rotors that I bought from ebay. Took the first wheel and tire off and seems that the rotor is stuck to the hub so I'm waiting on it to cool off and the WD40 to sink in to take the rotor off.

I hope I'm not mistaking....the rotor IS supposed to just slide right off correct? Or is there a need to take off that big lug nut in the middle of the rotor?

Any info will help!

When you have a new issue, it'* better to start a new thread.

WD40 is not a very good penetrant. Something like PB Blaster will do a much better job. You do not have to remove the big bolt on the end of the axle. You may have to give the rotor a few good wacks with a hammer on the face between the lugs. Be careful not to hit the lugs and mess up the threads.

Thanks Archon! Will give it a shot!