speed_69

in my automatic honda civic si(canada)..whenever it shifts gears, the car jerks just alittle bit sometimes..the same thing happens when it downshift as well. i did a tune-up today(spark plugs, distributor cap & rotor, fuel filter) but i'm just guessing it might be:
spark plugs wires? fuel injection system? vacuum hose leak? or just needs a tranmission oil change? timing? any ideas?

Jafro

2 things can cause this. 1 is not a problem. The other is a minor problem.

1. You're driving the car before it's completely warmed up.
-the idle speed is sometimes as much as 1000 RPMs higher when the engine's cold, and that can result in jerky shifts.

2. Your idle speed is set too high when the engine is warm.

I think Automatic cars are supposed to idle at 850rpms... but my service manual is nowhere in sight... you'll have to double check that in yours if the needle is any higher than that and the car's warmed up all the way.

You should flush/fill automatic transmissions every 30,000 miles ( or 48,280.32 "canadian").

speed_69

but even when the engine was fully warmed up..it was still doing it..and the idle is at 8500rpms by the looks of the tach.

Jafro

:jawdrop: :jawdrop: :jawdrop: :jawdrop:

HOLY CRAP!

Slow that thing down!

I edited my last post to reflect transmission service. Even if that's shorter than what your manual reccomends for service intervals, it should be done at LEAST that often because Hondas and Acuras with 4-bangers don't have serviceable transmission filters. They never get changed. So you have to service them regularly or boom. But they're still well-built transmissions.

96Civic_Coupe

i get a slight jerk right after shifting to 2nd @ around 21-22 mph. it doesnt do it if i accelarate a little faster than usual. anyone know my prob? i just changed the atf about a month ago.

Jafro

How many miles are on it?

96Civic_Coupe

70k

Jafro

Wow. That's a little early for a torque converter or valve body to be acting up. Did it start doing it before the fluid change, or is it something new?

96Civic_Coupe

before

speed_69

my bad it's 850rpm..i accidently typed in another 0. but yea next week i'm going to replace the spark plug wires and get my fuel injectors cleaned. and then the week after, i'm going to get a tramission oil change. hopefully all this works and helps my car run more smoothly. the car has about 145,000kms.

any more possible ideas about why my car is jerking when shifting and downshifting would be appreciated.