The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-24-2022, 06:11 PM   #1
SoCalSlaughter
Registered User
 
SoCalSlaughter's Avatar
 
Join Date: Aug 2010
Location: Ventura
Posts: 151
PCV Milkshake-Rusty oil dip stick

Truck is a 90 Suburban 5.7. About a month ago I went to check the oil, and noticed the top of the oil dip stick (Closest to handle) had rust on it. Oil is clean and full. Removed oil fill cap and its clean. Removed the air cleaner assembly and noticed where the fresh air tube comes in from the valve cover had a milk shake residue on it, also alittle bit on the throttle body itself. Coolant is full and green. Truck doesn't over heat. Replaced intake manifold gaskets to see if that would fix the problem. But after a few weeks the oil dip will get rusty again and the milk shake residue will slowly come back through the fresh air tube from the valve cover into the back of the TBI. Note, I dont make short trips in the truck. Work is about 15 minutes away, mostly freeway. Anything I should check for? Thanks in advance.
__________________
1990 Chevy Suburban v2500
1990 Chevy/Geo Tracker LSi 4x4 2Dr
1996 Chevy/Geo Tracker LSI 4x4 4Dr
2011 Chevy Silverado Crew Cab LT
1991 Nissan 300zx SlickTop
SoCalSlaughter is offline   Reply With Quote
Old 11-26-2022, 06:11 PM   #2
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,402
Re: PCV Milkshake-Rusty oil dip stick

It sounds like you are looking at it right on.....no issues in the oil? I dont know your location, but will ask.....is it very humid where you are? Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Old 12-02-2022, 08:53 AM   #3
cadillac_al
Registered User
 
Join Date: Oct 2013
Location: Maine
Posts: 2,368
Re: PCV Milkshake-Rusty oil dip stick

Somebody probably put a colder thermostat in it.
__________________
76 Chevy K20
76 GMC K15
77 Chevy C10
77 Chevy K10
cadillac_al is offline   Reply With Quote
Old 12-02-2022, 11:54 AM   #4
Dead Parrot
Registered User
 
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,583
Re: PCV Milkshake-Rusty oil dip stick

2nd the thought on the thermostat. Should be a 195. Also, a 15 minute drive, even mostly freeway, is a short trip. It is just getting hot when you stop it. Perfect setup for blow by buildup in the oil. You want the oil to get hotter then 212 so any water in the oil boils away.

Make sure the PCV valve is working and the vacuum port for it isn't plugged.
Dead Parrot is offline   Reply With Quote
Old 12-02-2022, 08:39 PM   #5
SoCalSlaughter
Registered User
 
SoCalSlaughter's Avatar
 
Join Date: Aug 2010
Location: Ventura
Posts: 151
Re: PCV Milkshake-Rusty oil dip stick

Truck has a 195 Thermo in it. I removed the PCV from the truck the other night and its free (Rattles). Tried to blow and suck though the PCV and it allows air in both directions. Its currently raining here, so Ill check the vac port on the TB this weekend to make sure its free.
__________________
1990 Chevy Suburban v2500
1990 Chevy/Geo Tracker LSi 4x4 2Dr
1996 Chevy/Geo Tracker LSI 4x4 4Dr
2011 Chevy Silverado Crew Cab LT
1991 Nissan 300zx SlickTop
SoCalSlaughter is offline   Reply With Quote
Reply

Bookmarks

Tags
milkshake, pcv, rust, rusty


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:13 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com