zex_cool

my friend has a stock 99 GS with 108,xxx miles on it. the problem is when he downshifts for example to second and starts to accelerate, black smoke comes out of his exhaust. it only smokes when the engine is as high rpm. we did a compression test yesterday and he had 155,160,150,165. it also uses oil he goes thru a quart once a week. any help would be appreciated.

cloud

compression seems a bit low to me. Did you let the car warm up first, open the throttle all the way? What's his setup? Black smoke means he's running rich. Are you sure your not leaking oil?

zex_cool

car was warm when we did it yesterday. we did it closed throttle. car is stock only has a air filter and cat back exhaust. there is no sign of any oil leaking.

cloud

try it again w/ the throttle all the way open. compression test only takes 4-5 min. literally.
whats your setup?

zex_cool

ok, ill try it. but any idea why it smokes and uses oil ??
1999 Acura Integra GS
B18b1 w/ 108,xxx mi.
5 spd.
i really dont know what your asking me ? its all stock.

1991civicsi

Compression seems a tad low, its possible rings may be showing signs of wear. Its also a possibility that the valves may be leaking due to worn guides, or seals. A leak down test will help to narrow down your possible leak.

BoostedBSeries

my b18a1 just compression tested 208 209 210 209 so yers is a little low

jacobgsx

You could havegood compression and have bad oil rings, also worn stem sealswont effect compression eather, but they o nly leak under deceleration...