(1991 Honda Civic SE: 1.5L, 4-speed automatic, 290,000km / 180k mi)
Not quite sure what the problem is, figure I'd start something here and get some ideas on diagnostics before I dig deeper. This $500 Civic has just encountered its first worrysome drivability issue in almost two years and 40,000km.
Scenario: With light throttle application at varied speeds and varied gears, I experience some lurching, as if the trans and/or engine control is calling for a shift that isn't (and shouldn't be) happening. It had mostly been noticable BELOW TC lockup speed. Usually, lockup happens at about 65-67km/h (40-43mph). Lately, at 50-55km/h (31-34mph) the car will appear to want to repeatedly go in and out lockup, it feels like bouncing off a rev limiter, so to speak. The tachometer agrees.
- Driving faster and/or adding more throttle tends to stop the lurching.
- Condition improves, but does not disappear when car warms up and has been driving a while.
- Condition happens at speeds as low as 20-25mph and as high as 70mph, the latter of which is just a one-time hunt out of and back into overdrive
- I'm going to do a little more driving in D3 (non OD) instead of D4 (OD) tomorrow and see how that affects the situation.
Transmission fluid is nice and red, not burnt smelling; levels look OK. I'm also thinking about ignition or fueling related issues, but not sure where to head in terms of that. I know this is not a Honda forum, but any general ideas would be appreciated.