IDI - BLOW BY QUESTION???

[texasstroker]

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?

[texasstroker]

Am I the only person with an IDI truck that has blow by?????

[powerstrokes only]

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.

[itn69]

Originally Posted by powerstrokes only

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.

[texasstroker]

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....

[powerstrokes only]

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!

[texasstroker]

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!!!!

[FordGuy100]

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.

[texasstroker]

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.