I rebuilt a 1994 Geo Metro 1.0 L Motor. New rebored engine 20 over,New bearings, Re-built head with upgraded lifters(According to the Shop). I use 5w30 grade Synthetic oil. I have done almost 4000 miles since the rebuild.But I cannot drive the car over 55MPH for extended period in Highways. Off and on a bluish white (more white)smoke comes off the Exhaust. I notice a lot of oil in the throttle body and under the air cleaner. This is coming from the Emissions.I wonder any experts can give me some Idea. When I put a restrictions to the emission tube going to the air cleaner the oily mess in the air cleaner is reduced but the the steamy smoke comes through the Exhaust at highway speeds(Over 60 MPH).

I do not see any loss of coolent or the oil level.

Valve stem seals?

__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

The 1.0 in the Metro is a neat little engine - the only one I have ever replaced without using a cherry picker (just picked it up). The bottom ends never fail - it is usually the head and valve train that wears out, causing the bluish smoke and heavy oil consumption. Why did you overbore? What was done to the head? I don't think the guides are replaceable on that head; you have to purchase a new or remain replacement. The valve stem seals are replaceable, however.

__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Intake valves no doubt. Managed an automotive machine shop for a dozen years.
Lemme ask you...how many miles did you break it in for? how soon did you do the highway speed?and what grit hone was used in the rebore?
Oh,forgot...you got auto tranny with vacuum modulator?

__________________

Are you hinting at what also crossed my mind? Oil is being sucked into the intake somehow. I've heard of it coming from the transmission thru a failed modulator and I also had it travel from the pan to the intake via a failed PCV valve on an MG.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

That's your problem. Never use synthetic in a new/rebuilt engine for the first 15,000 miles. It will not break-in correctly with synthetic.

Compression and cylinder leakdown test time.

Blinker fluid seepage. Gotta be. You have a leaking hydrostatic reeberstator. Check the left interlocking flimstock connector at the clyber valve. Seals go out on those all the time.

__________________
past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)

Horse*****,if anything it's the coruscating emasculator phallusing the uberstat,remember the arbeit macht frei will nethersole the crapusculum,so that's where I would indelify were it my unobfuscation........but still,never,NEVER break in a reciprocating hydrocarbon motor with Synth,BAD move.

__________________

I thought it sounded like a leaky head gasket.

Tom W

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Philistine!!!!

__________________

Seriously, what about a bad PCV valve? Really. I mean it. I'm not kidding.

...........maybe...............

__________________
past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)

A PCV valve is mainly to prevent the flame of a backfire from getting into the crankcase. Even if it was stuck open, it wouldn't cause that much oil consumption.

In any case, if they are going as far as rebuilding a 3-banger in an $700 car, I hope they would replace something as simple as the PCV valve.

It's having the valve stuck closed that creates the hijinks.