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Old 07-08-2007, 02:46 PM   #1
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Default I may be joining the trashed motor club....

well the car is smoking..... quite a bit as of last night...

first things started as a little smoke on startup, that went away after 30 seconds or so.....

now it seems to just smoke any time I'm on the throttle..... hoping it's the turbo, but I pulled a plug and there was oil on the threads....

need to run a compression check today at some point, but it's *** hot out....

worst part is I have an autocross school tomorrow, and the miata is fucked up, looks like I'll be driving the 240 instead unless I solve the smoke problem today somehow.

oil level is fine, as is coolant level, and both look clean. The turbo's spoolup seems like it has gotten a bit slower lately (not that it was fast in the first place) it has a bit of up and down shaftplay, but no side to side or forward and back play in it.....

I'll also check the PCV valve, but then again it was fine a month ago or so....

any ideas? the smoke doesn't have a distinct smell of fuel, coolant or oil.... it's dark colored, and there is an oilyish residue (that's always been there) inside the tailpipe) Also, we put a test pipe on the car yesterday if you think that I might just be burning **** out of the exhaust......
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Old 07-08-2007, 04:07 PM   #2
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do a compression check if it comes out ok then your motor is most likely good. still turbo rebuild is abit of a chore alot less work than a motor build
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Old 07-08-2007, 04:15 PM   #3
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meh, I'd just change turbo's..... one of the reasons I think it may be a turbo issue is that I've been running a fleabay T3/T4 for a little over a year now.... it was bound to go at some time
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Old 07-08-2007, 04:33 PM   #4
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You'd know if it was coolant. If it's dark at all it's probably oil or fuel. possibly oil is getting past the seals.
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Old 07-09-2007, 12:05 AM   #5
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if it's turbo it would only smoke during vacuum... like sitting at stoplights or light cruise. that's when it'll suck oil through the seals and smoke like a bitch.

smoke under power and black oily soot is probably sadly rings. maybe valve seals depending on the compression test results.

Here's my guesses:
compression low dry, compression high wet: rings
compression low wet and dry: valve seats and possibly seals.
compression fine: valve seals
smoke like a SOB at idle: turbo seals
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Old 07-09-2007, 04:43 AM   #6
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i dunno dude mine didn't smoke till the turbo went out.
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Old 07-10-2007, 12:25 AM   #7
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yeah it smokes bad at idle, and just off idle at a stop. If I stall the car and re-start it, it smokes badly (only stall because the clutch is junk)

started it up today in hopes of a miracle before my level 2 autocross school, and the smoke is light in color, and increases with throttle input at a stop, but I didn't really throttle it up much because it was cold.

ended up using the 240 fopr the school today instead.....
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Old 07-10-2007, 10:26 AM   #8
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I'd do a quick compression check at this point...

in the least pull the spark plugs and check for oil on the electrodes.
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Old 07-10-2007, 11:26 AM   #9
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if it was JUST at idle, i'd say seals. but since it's idle and on the gas, i think you're fooked.
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Old 07-10-2007, 06:18 PM   #10
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so i run a compression check (car is a 2000)

results are as follows.... from front of engine to back

Dry:
165
150
150
180

Wet:
180
160
170
190

The plugs had oil on the treads and were rather dark in color..... I assume piston rings at this point. Might have a leakdown done to confirm.....

Opinions????
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Old 07-10-2007, 07:06 PM   #11
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you pulled all the plugs and floored it and cranked til it peaked and stopped rising right?

cuz that looks like rings and or valves and you name it.
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Old 07-10-2007, 07:59 PM   #12
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well I pulled the plugs one at a time... but otherwise yes, cranked till the pressure peaked and stopped rising....
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Old 07-10-2007, 08:27 PM   #13
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oh.... I didn't floor the gas.... big deal or no?
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Old 07-10-2007, 08:39 PM   #14
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big deal, you have to do it wot
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Old 07-10-2007, 08:47 PM   #15
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you're suposed to have all the plugs pulled when you do a test arn't you? Would you like for me to take a look at it, or if you need help with anything let me know, i live in MD and i'm free all week till sunday, i work in towson. but live in Odenton (arundel mills)
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Old 07-10-2007, 09:00 PM   #16
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oh great, so much fun, have to do it again......

I'll let ya know if I need any help with it, unfortunately I have to work 7am-7pm the rest of the week
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Old 07-10-2007, 09:27 PM   #17
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new results, with throttle wide open, and all plugs pulled....

210
185
185
210

also, a funny noise from the head as I was revving the car up a bit to look at the smoke and warm it up for the test.... kinda like a quick rattle around 4k on both the up and downswing of revs....
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Old 07-10-2007, 11:36 PM   #18
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According to the service manual; 209-psi is "standard", 146-psi is minimum, and max difference between cylinders is 28-psi.
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Old 07-11-2007, 01:56 AM   #19
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could still be the valve seals... dont think that shows up on compression tests. good to know it's not the rings though.
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Old 07-11-2007, 10:37 AM   #20
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I vote "mildly blown" head gasket - oil from return galley
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