94 Honda Civic smoke when deep in the throttle?
Found a honda on craigslist i'm considering trading for but he says the car smokes when you're "deep in the throttle" and i'm wanting to know what could cause this? 30K on the motor and i'm assuming it's not when the VTEC engages otherwise i would know what it was. I can ask him what color the smoke is if anyone needs to know that. I'm hoping it could be something other than the rings but i'm thinking it might be that they didn't seat right after they built it (which i guess they did do since the post says "30k on build") Anyway, all help is appreciated.
I think if it is blue smoke, the piston rings are failing, 30 k since a rebuild is meaningless it it is in need of a rebuild NOW.
What's "deep in the throttle"? WOT? There are only two kind of piston rings on any engine: The compression rings and the oil control rings; they're both have to 'space' in certain degrees apart from each other gap.
Color of smoke? Surely an interesting question: Blue smoke indicates oil burning, whitish like smoke indicates unburned fuel or coolant while black smoke indicates lack of air into the combustion chamber.
30K miles after engine rebuilding and the smoking occur when "deep in the throttle" like you've said, oil control rings failure will produce blue smoke, the same with valve guide seals or valve guide worn out. Unburnt fuel will also produce whitish/gray color like smoke. Injectors failure?
I've not seen a failed head gasket produce a smoke like "deep in the throttle" like you've said.
Compression rings failure will be a resulting of lost of compression and the result will be hard to start, long cranking etc.What's the compression readings? Oil control rings failure will resulting in… Smoke.
VTEC system failure is another matter. My questions are: What's the color of the smoke? Does it smoke every time you step on the throttle or smoking all of the time?
You were there, test drive or let a repair shop give you an estimate of repair. Now if they (The seller) can't give you any answer after you've read my answer: Stay away from buying this car, whoever doing the engine re-building: He/she did not know anything about combustion engine at all.
I have never known of an engine that smoked on hard accleraion to be anything but compression rings. I bet the engine was not properly broken in after the rebuild.
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