Interesting side effect?
Junior User
Joined: Jul 1999
Posts: 68
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Interesting side effect?
Well, here goes. Recently purchased a new Holley 600cfm elec. choke to replace my older Holley man. choke(got tired of power valves blowing out the last few years) Took it out of the box and slapped it right on. No adjustments. Started up all right, but is idling like crap. I've got light black smoke out the exhaust and had some oil come up the oil level check tube. I'm aware that usually too rich of an air/fuel mixture will cause the black smoke. I've played with the idle mixture screws to no avail. I did have to reuse my old intake manifold gasket, since Holley only gave me one, which I used between the carb and the spacer. I haven't played with the fast idle screw. Any ideas what could be causing this? My first suspect is the gasket, but it didn't appear to be in that bad of shape. Could an intake leak blow up oil that direction? Any help would be appreciated.
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Posting Guru
Joined: Jul 1999
Posts: 1,558
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From: Inthepast
Interesting side effect?
Where does your PCV valve connect to? I intend no offense by this next question, but your oil level is not too high is it? Sounds like you have crankcase pressure causing the oil to come out the dipstick tube.
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
Junior User
Joined: Jul 1999
Posts: 68
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Interesting side effect?
Stockman,
The PCV valve conn. goes from the valve cover into the back of the spacer. The only thing about the oil level is that it didn't change from before. Never had this problem with old carb. Didn't change oil level with new carb. The oil came out the dipstick when I first took it out for a test drive, and didn't do it again. Has me perplexed for sure. Thanks for the reply though.
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
The PCV valve conn. goes from the valve cover into the back of the spacer. The only thing about the oil level is that it didn't change from before. Never had this problem with old carb. Didn't change oil level with new carb. The oil came out the dipstick when I first took it out for a test drive, and didn't do it again. Has me perplexed for sure. Thanks for the reply though.
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Senior User
Joined: Jan 2000
Posts: 103
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Interesting side effect?
The one time I had oil blowing out my dipstick was when the rubber hose from the pvc to the carb was kinked, the way I found this was I just ran a straight length of hose from the pvc down the side of the block to the road. When I did that the engine was breathing normal again and all signs of oil around the covers and dipstick stopped showing up. Sounds like you need less backpressure in your system... good luck. 2x2
Junior User
Joined: Jul 1999
Posts: 68
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Interesting side effect?
I will check into the PVC valve conn. tomorrow. It's hooked up, but I didn't thoroughly check to make sure it wasn't funky or anything. Thanks for the help.
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
Interesting side effect?
Ozzie, Is it possible that the factory (Holley) set the choke too tight, causing your smoke, and/or are you sure you've got voltage going to your choke, to warm it up & pull it off, I don't think you've got any problems with your PCV system, as it sounds like you have it hooked up as you did before with the old carb, Supercab
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Fleet Mechanic
Joined: Nov 1999
Posts: 1,415
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From: Lower 48
Interesting side effect?
I had an engine once that used go through a gallon of oil in 100 miles. It was blowing it out of the dipstick tube. Nobody could tell me why. The dipstick would always be up about an inch and the left side of the engine would be convered in oil. I had an engine rebuilt and that took care of it. The old engine was shot anyway. About 2 yrs after I dropped the new engine in it did it again once. When I came down to a stop sign all the lifters were knocking like crazy, I looked under the hood and sure enough the dipstick was up about an inch and the whole left side of the engine was covered in oil as well as the firewall.That was the only time the new engine ever did it. I talked to an old mechanic who told me that occasionally all the rings will line up on one cylinder causing the blowby to vent into the crankcase and out the dipstick, then the air blowing across the top of the dipstick tube will cause a siphoning action and suck all the oil out of the engine. It made sense to me.
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Junior User
Joined: Jul 1999
Posts: 68
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Interesting side effect?
That is another question I had that I didn't think of earlier. I've got the choke grounded on the carb like Holley instructed, and I've got the positive lead going to the alternator, the only electrical source close enough. Is that a good 12v source for the choke, or am I misguided? Could be the problem?
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
Joseph Osborn
70 F-100 Stepside
302 V-8 3spd stk
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