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Location:
Sydney
Registered:
January 2004
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4AFE engine query
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Sat, 14 February 2004 14:15
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I just bought an AE92/94 for the gf. Just did an oil change today and one thing I didn't check before I bought it was whether there was much air/blowby coming out through filler cap when car was running. I did this today after the oil change and oil started spitting out, not too much but enough to put oil cap back on quick. I notice the 4AFE has the 2nd camshaft running off the 1st with a large gear that is exposed when you have the filler cap off..is this normal for it to spit out some oil due to the design. Can somebody please check if there's does this... I also checked the PCVs, where I thought the line would be pushing air back into inlet (as in my GE), it was in fact sucking air..please check out the pic. Could anybody enlighten me on this? Hope I haven't bought her a dud  Should there be vacuum in the top of the engine like this? The car seems to run smoothly, decent power..for an auto 4AFE anyway. Thanks
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Location:
Sydney/Wollongong
Registered:
October 2003
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Location:
Sydney
Registered:
January 2004
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Re: 4AFE engine query
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Sat, 14 February 2004 23:36
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Thanks for the reply Conquest. This car doensn't seem to be doing it occassionally... more like all the time flicks of oil would come out if you had the cap off. I suppose the PCV line etc would be different on yours becasause it's a carby model.
Cheers
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Location:
Sydney
Registered:
January 2004
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Re: 4AFE engine query
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Sun, 15 February 2004 01:42
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Anybody wanna fiddle with there 4AFE to see if there lines to the rocker cover do the same thing and oil "spits" at them from the oil cap. Thanks guys. 
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: 4AFE engine query
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Sun, 15 February 2004 02:28
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I don't a an FE but I left the oil filler cap off my FC and had a lot of oil to clean out of the engine bay when I realised why I could smell oil in the car. So it definitely spits oil out the hole. If you have a gear wheel there it is only natural that oil will get flung off it so if the hole's open and the engine is running.
As for your rocker cover plenum hoses, the thicker one has the PCV (shiny bit) plugged into the rocker cover. If you pull that out (it's only mounted in a rubber grommet) you should be able to suck and blow in each end and find that air only goes one way through it. If it goes both ways you need a new PCV (positive crankcase ventilation) valve. So air should be going from the rocker to the plenum only. If you pull this hose off when the engine is running you are allowing more air to get into the plenum (after all the sensors in the intake) so the tuning and hence revs will be affected.
As for the thin hose, it looks like it is connected between the rocker cover and the throttle body (before the butterfly). I'm not sure what its purpose is but if there are no other air inlets into the body of the engine it may be supplying fresh air after the air filter) to circulate through the crankcase for the PCV to suck out and it would therefore have air sucking into the rocker cover.
So it sounds like your gf's car might be running properly 
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: 4AFE engine query
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Sun, 15 February 2004 02:53
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| HighRolla wrote on Sun, 15 February 2004 12:42 |
Anybody wanna fiddle with there 4AFE to see if there lines to the rocker cover do the same thing and oil "spits" at them from the oil cap. Thanks guys.
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Yes the lines do the things you have said , and yes running the engine without the oil cap on will make it spit oil like a bitch.
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Location:
Sydney
Registered:
January 2004
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Re: 4AFE engine query
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Sun, 15 February 2004 03:27
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Thanks Scorpion and Diz. I have a bit more faith in the motor now. Maybe it isn't blowby when I take off the cap after all. If the thin line (leftmost) is sucking air into rocker cover like I told you..then PCV valve must be doing its job and getting rid of the blowby as the thin line would be pushing out air from rocker cover also if there was excess blowby?? Is this the right way to think about it? Thanks heaps for the help.
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