IDI - BLOW BY QUESTION??? - Ford Powerstroke Diesel Forum
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Old 03-03-2011, 11:22 AM
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IDI - BLOW BY QUESTION???

How much is too much blow-by on an IDI motor???

Just bought a 1988 FORD F-350 CREW CAB 4X4 truck with a 7.3L IDI non turbo engine, automatic tranny with a 189-k miles. I tried to buy this truck last month and did not really notice any blow-by and the truck has been setting since. Bought it yesterday and notice it has blow-by now and someone has jacked up the dip stick trying to put it back in the tube and now the tube moves around.
Do I have engine problems or maybe the CCDR?
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Old 03-07-2011, 12:36 PM
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Am I the only one???

Am I the only person with an IDI truck that has blow by?????
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Old 03-07-2011, 03:56 PM
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You are'nt the only one with blow by I guarantee! I have a '94 IDI Factory Turbo with almost 315,000 miles that looks like a tea pot and still runs great! I just bought a 1990 with a 116,000 miles and it has a little too. I think it is pretty common. I am just not going to worry about mine.
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Old 03-15-2011, 05:55 AM
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Quote:
Originally Posted by powerstrokes only View Post
You are'nt the only one with blow by I guarantee! I have a '94 IDI Factory Turbo with almost 315,000 miles that looks like a tea pot and still runs great! I just bought a 1990 with a 116,000 miles and it has a little too. I think it is pretty common. I am just not going to worry about mine.
I agree with powerstroke only. Mine does as well and I don't worry about it either.
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Old 03-15-2011, 07:10 AM
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WOW, guess something maybe wrong with my other 3 then. None of them have any blow by at all. 1-1993 F-350 with 190-k, 1 1992 F-450 with 347-k and a 1991 F-350 with 249-k.... This is the only IDI truck I have ever owned with blow by, but you are right, it runs good....
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Old 03-17-2011, 06:49 PM
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The '90 I just bought has a Banks turbo, and they put an adapter in front of the oil filler for the tube that usually runs from the valve cover to the intake, I am thinking (I am NOT a mechanic) that you will see more blow-by because of the position of the oil filler cap. I don't know??????????? I have never checked my 89 IDI with 290something thousand miles, I imagine it has blow-by too. My '94 with 315,000 miles does have significantly more blow-by than the '90 though. I am just going to run the heck out of them. I have gone back to all IDI's now because I trust them, I can do a lot of work on them myself, and the parts are a fraction of what Powerstrokes cost and I simply just like them!! Oh yea and I don't owe money on them!
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Old 03-24-2011, 12:47 PM
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Ok, figure this out.... After I drove this thing a week or so, got the dip stick tube back in the block/pan where it goes and I checked for blow by again today just to see and I have about 1/3 of what it was last week....

Figure that out!!!!
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Old 03-25-2011, 09:21 PM
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Rule with IDI's and blow by. With a fully warm engine, idling, take the oil cap off. Now manually increase the RPM's by moving the throttle lever on the IP. The blow by should "disappear" by about 11-1200rpm's. Mine will disappear at roughly 900 rpm's.
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Old 03-26-2011, 07:35 PM
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Thats all fine and dandy, but still does not tell me WHY it had a pretty good amount of blow by 2 weeks ago out of the oil cap and dip stick tube (after setting for a couple of months) and now there is VERY LITTLE out of the oil cap and NONE out of the dip stick tube since I have been driving it every couple of days and actually put the dip stick tube back into the block/oil pan like it belongs.
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