Performance probs at and above 50 mph

[rkarl89203]

2001 Lanos, Automatic, 84K miles.

At 50 mph, there is occasional bogging, especially on heavy acceleration. Above 60 mph, it smooths out.

Timing Belt was replaced at 63K miles. No maintenance records when I bought the car....overall, a REALLY nice vehicle....

But the sometimes bogging at 50 mph to 60 mph is really annoying. SO

I went to the how-to section and got info on replacing the fuel filter. Replaced the fuel filter, air cleaner, and ran some REALLY high-tech (and high cost injector cleaner) through it.

No change.

I note that my combined MPG has fallen from 31 mpg to about 27 mpg....

Charge spark plugs next?

Any ideas out there?

[daewoomofo]

try the plug wires, when my car dropped mileage i changed the wires and it went right back up.

[benzino]

Yeah, change plug leads...
you may as well change the plugs at the same time, then you won't have to worry bout them as well

[rkarl89203]

Well, really odd....

Havent done anything yet problem is pretty much GONE.

Only thing that has changed is the weather, rain has stopped and the temp is 20 degrees cooler. Humidity is WAY down.

My thought is that this further points to the plug wires, correct?

[BosnianLanos]

Yeah, humidity can wreak havoc on the ignition system. Change your plugs, wires, and add injector cleaner so you have insurance if it starts raining again.

[rkarl89203]

Thanks for the tip...oddly enuf, the wires have to be ordered, will get them in a week....

Will change plugs, wires and do the injector thing (again)...

Once again, thanks!