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Car is a 91 Honda CRX Si/SE. but the engine came out of a Honda Del Sol. engine name is a D15 Vtec.
alright. so i KINDA did some research on what my symptoms are and kinda am winding down to what it could be. its either valve seals or the rings. but here’s what is happening with my car.
back in the winter time, i was starting my car when it was really cold out, like -35C, i didnt have extra cash to install a block heater or an oil heater cuz i was a student. well needless to say that, when i started it up sometimes, i would hear a grinding noise in the engine, yes there was oil in the car as well.
come to present time, i am burning oil. when i would start the car, it would only puff smoke upon WOT. its not smoking when i drive or even at idle. when i’m driving around town, and driving at say between 50-70km/hr and then come to a red light….i can smell the oil burning, coming through the vents when i had the heater/AC on.
the idle is below 500 when its warm. and it backfires quite a bit between 2k-3k. when i’m Downshifting, and rev up to match the revs from below 1k rpm. it would backfire very loudly, like only one big backfire.
I havent done a compression test yet.
i just wanted to know what you all think so far.
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First you need to do a compression test. remove all the plugs and take out the fuel pump relay or fuse. Inspect the plugs,and keep them with the cylinder they came out of, just put holes in cardboard and label them you can keep track. first do a dry compression test and record what you get for each cylinder with the cardboard with the plugs in it. if there are any that are low or not consistent with the others, put some tranny fluid in that cylinder and do the compression test again in that cylinder. if the number gets bigger then its for sure your rings. Note: that if all of your reading are consistent but low (below 120-100) depending on the age of the engine, then you either need to rebuild or replace the engine, if so, hopefully its just your valves and not your rings, because in that case you would be better off getting another engine. so if you want to know if its you valves you need to do a leak down test. do you have and air compressor? if so you don’t need a tester, just put a breaker bar on the crank pulley, the cylinder you are testing must be at top dead center, and thread your air hose into the plug hole. pressurize it to 30 to 40 psi and listed for leaks in the exhaust, intake, and your oil fill hole. If you hear air in the intake or exhaust its your valves, of valve seals. if you hear it in the oil fill hole its your rings. just make sure you hold the breaker bar because it will turn the engine over when you pressurize it. my guess is the grinding noise was something else, most likely the starter wasn’t disengaging due to the temp or something. The other thing you may want to consider is a bad pcv valve. take off a couple of vacuum lines and see if there id oil in them. the backfire would point to exhaust valves maybe. When was the last time the timing belt was changed? keep us posted.
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