90 Jetta, power loss when warm

I didn't notice this because my drive to work is only about 12 minutes. After about 20 minutes or so on the highway, it bucks or just looses power. So I was shifting back and forth between 4th and 5th, which would refresh the car and it would run fine for a minute or two. Then I discovered I could leave it in 5th and just periodically let off on the gas for a second (fully)and then hit the gas again. It was a bit strange speeding up and then slowing down constantly. Bad for gas milage I'm sure.

So I figure it's electrical, something is telling it to go lean, maybie the O2 sensor or wiring. Not sure why this doesn't happen in the first 15 minutes. Hoping for advice before playing with the O2 sensor.

Thanks again. Les

Reply to
IRv
Loading thread data ...

Thanks, that looks like a train of thought I can jump aboard. I'll take my time since the problem doesn't occur on my normal commute.

Reply to
Irv

Hi Les,

My Golf of the same vintage was losing power at high revs and some new plugs solved the problem.

I'm not saying that's your problem but it's always a good idea to check the basics first, if you haven't already. How's the fuel filter? How about Vacuum leaks? The cap and rotor? Sometimes one problem can lead to another.

Best of luck.

Reply to
B Briggs

Does this problem appear when temperatures are near or below freezing, and when the humidity is high?

There have been similar reports of these symptoms > I didn't notice this because my drive to work is only

Reply to
ngt

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.