Has anyone experienced the SSEI running rough during heavy wet weather. Mine seems to jerk into gear in wet weather. It runs smoothly most of the time, but it seems to act up in wet weather - although sometimes it IS ok in wet weather.

I'm wondering - is this how the tranny goes? intermittently until it totally craps out?

Or could it be water in the gas or something to do with the supercharger?

Thanks for your reply, Mark.

No warning lights come on. It hasn't happened in a week or more - and it has only happend 2 times total ever, both within the last 2 months.

Think it might be fuel injectors? Maybe I should put stuff in the gas tank to clean the jets... or change the spark plugs... It always has a little bit of a flat spot unless I stomp on it.... When I want to use that supercharger, it doesn't jump immediately - it takes a couple seconds to respond. I always figured that was the computer, but maybe not.

It sounds like the plugs and wires, check them and replace if in doubt.

I use fuel injector cleaner every 6 months, the stumble may not be caused by this but it wont hurt to keep the injectors clean.

stupid answer...but just to be sure...

traction control engaging?

yea what he said if it was a wire shirting out pop the hood at night run the car and generally you will see a spark

Try this to check shorting plug wires in damp weather. Take a spray bottle and mist the wires when its kinda dark. The leaking wires will arc or get blue haze at the point/* of the current leakage.

A water/alcohol solution......about 50/50 should be good.

Thanks for all the input. I'll look at the plugs and/or wires - which of course brings me to another question. The dealer says it doesn't need a tune-up until about 100K miles - is this considered part of the tune-up? Are plugs hard to change in this engine (SSEI)?










I want Pontiac Dad'* engine :P

Tune ups ain't what they use to be! A tune-up, per se, on your car is typically plug change. I can't think of anything else of a "tune up" nature that will go 100k miles.

The plugs are not difficult to change. The fronts are a piece of cake. The rear ones are a little tougher. The two on the passenger side can be reached with the left hand. The one on the right can be reached with the right hand. The toughest part on the rear is breaking the boots free from the plugs if they've never been off. This takes some real finger torgue and wrist leverage but I can do it and I'm average build and height. When you reinstall the plug boots use a little silicone grease on the inside tips of the boots. This will significantly help ease your pain the next time you do plug work.

It is funny that GM recommends plug changes at 100k. I thought that was only for Platinum. The originals I pulled off looked like NGK Copper, each with a funny little tit on the ground electrode.

It misfired like crazy with new Platinums. I have always used Platinums but a few on this site said they were not compatible with the 2000+ SC. I really did not believe until I went back to copper cores. Sure enough..........no more misfires.