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Engine Specific Info and Questions => IDI Engine => Topic started by: Smoker on April 17, 2015, 11:28:00 am
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I may be showing my noob-ness here, but I thought this only happened on turbo motors?
My 1.6na had been acting weird, idle hanging high, sometimes wanting to rev on its own...
Then I stopped for fuel and when I went to leave, it started up, clattering a bit more than usual, then just went for the moon. Before, when it wanted to rev on its own, turning the key off did the trick. This time, no dice. Tons of white/gray smoke out the exhaust, and I had to dump the clutch to shut it down.
What went wrong? And what do I do now?
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I just fired it up again, because my curiosity was getting the best of me. I wouldn't say it's purring like a kitten, but it's not trying to run away, either. I'm confused.
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usually blow by forces oil from the head and crank in to the intake. first of all disconnect the ccv hose that goes from the valve cover to the intake. how is compression? u can add the cam splash guard and another breather hose to the front of the block, both of those things help a lot but usually this is a good sign that the engine is spent. had this happen to me on an old 1.6na i had.
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mine usually did it on the highway
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its either blowby and cc pressure ^^pushing oil to the intake thru vent in valvecover; or an ip problem. check pressure coming out of vent and how much oil is making it out of that vent. of course a compression test^.
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Compression was 400-425 cold, with a harbor freight tester. I haven't checked it since I got it running. I do see a fair amount of oil in the vent hose... more than I'd expect.
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I guess I'll end up putting a fresh 1.6 together with stuff I've got lying around here. Win some... Lose some.
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i dont see how thats a problem; 400+ cold is excellent; why now do you have a lot of oil coming up to intake??
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I don't know... Any ideas?? I thought those numbers were decent as well...
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Unless it is an i/p problem?
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if your compression #s are that good why do you have oil coming up out of the vent to the intake?? retest compression is my first thing, right now.check vac pump and connections, a leak here can push oil into the intake as well,,
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True. Can't say I thought of that! My weekend is pretty much packed, but I think I'll check compression again Monday morning.
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Because of compression #'s are good, I shouldn't have enough blowby to cause problems...... Right??
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...check vac pump and connections, a leak here can push oil into the intake as well,,
As if the vac doesn't vent into the crankcase already?
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Because of compression #'s are good, I shouldn't have enough blowby to cause problems...... Right??
I'd get current compression #s... rings are the usual suspect.
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checking the main and vac connections is fairly simple; a compression test is more difficult. both. the vac if theres any leak @brake booster, or the line; this too can happen, and lead to a runaway situation; takes a few minutes to check vac connections, brake booster connection, and possibly brake booster, as the leak will pressurize crankcase and can blow oil out of vent.
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u might be able to solve the issue more venting and a cam splash guard.
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...check vac pump and connections, a leak here can push oil into the intake as well,,
As if the vac doesn't vent into the crankcase already?
The vac system is suppose to be closed, which means the vac pump isn't actually pumping air into the crankcase, except to make up for when vacuum is used.
Try pulling your main vacuum hose and reving the engine up. Your disptick will probably push out of its tube.
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u might be able to solve the issue more venting and a cam splash guard.
The more I think about the splash guard, the more it makes sense. I mean there's no filter or anything on the vent outlet, and the cam is slinging oil everywhere... how is it NOT going to end up in the intake?
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...check vac pump and connections, a leak here can push oil into the intake as well,,
As if the vac doesn't vent into the crankcase already?
The vac system is suppose to be closed, which means the vac pump isn't actually pumping air into the crankcase, except to make up for when vacuum is used.
Try pulling your main vacuum hose and reving the engine up. Your disptick will probably push out of its tube.
You mean pull the main line off the vac pump? If it pushes the dipstick out, what does that tell me? For some reason, the logic of this aspect of an engine has always escaped me.
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The vac system is suppose to be closed, which means the vac pump isn't actually pumping air into the crankcase, except to make up for when vacuum is used.
if @brake booster or hard line, if theres enough of a leak it will pressurize the crankcase; separate of motor mind you, it ll suck air in and send it to the cc, usually it will push oil out of dipstick, and perhaps more. its not hard to check and if its not the problem, you checked, should take a few minutes, a light a mirror and a pair of eyes. if it does happen to be the problem, it could be, if not its going to be a question of the rings, compression test.
a splash guard over cam helps with oil coming up out of vent, but if its enough to run the engine on its own, i doubt this is the only problem.