Gas in oil on 302? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 04-18-2004, 01:35 PM
Member
 
Last photo:
Join Date: Jun 2003
Location: Oklahoma
Posts: 96
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Gas in oil on 302?

I am trying to diagnose a problem for my brother who lives 800 miles away from me.

He has a 92 Mustang with a 5.0. It recently sat for about a year and is now running after replacing the distributor. The car has over 200K miles but has been taken care of very well.

He has discovered that his oil volume in the pan seems to be "growing", meaning that after it is driven several (15 - 20)miles that the oil is higher on the dipstick than before. After this short drive he estimates that the oil level has increased by 1/4 to 1/3 quart. It is being checked on a level surface each time and only after the car has sat for approximately 30 minutes. The oil smells like gasoline but there is not enough present for the oil to burn.

Where might the gasoline be coming from? This is a fuel injected car and he states it is running rich but not enough to blow any black smoke.

Any help would be greatly appreciated!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-18-2004, 02:41 PM
BigBlockBabe's Avatar
Missing You
 
Last photo:
Join Date: Jul 2002
Location: Marietta, GA
Age: 36
Posts: 300
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Just my guess, but if it sat for awhile then the injectors probably went bad and are allowing the gas to seep down into the engine. He needs to get a fuel pressure gauge and check to make sure the fuel line/rail is holding enough pressure after the engine is shut off.

Somebody correct me, as I could be off...but I had to do this on my Bronco, because I smelled gas in the oil.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-18-2004, 03:06 PM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Thumbs up

Quote:
Somebody correct me, as I could be off...but I had to do this on my Bronco, because I smelled gas in the oil.
DAMN! I'M IMPRESSED!

Pretty and smart... Can you make biscuits...
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-18-2004, 03:13 PM
Grumpy
 
Last photo:
Join Date: Dec 2002
Location: D.C.
Posts: 1,447
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
A FEMALE!

And here I thought they all were extinct.

J/k, J/k.

Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-18-2004, 08:34 PM
BigBlockBabe's Avatar
Missing You
 
Last photo:
Join Date: Jul 2002
Location: Marietta, GA
Age: 36
Posts: 300
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally posted by KULTULZ
DAMN! I'M IMPRESSED!

Pretty and smart... Can you make biscuits...

Uh, yeah! What southern girl can't make biscuits?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-18-2004, 08:43 PM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally posted by BigBlockBabe

Uh, yeah! What southern girl can't make biscuits?
...taking that night train to Georgia...

Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-18-2004, 10:41 PM
Member
 
Last photo:
Join Date: Jun 2003
Location: Oklahoma
Posts: 96
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Called little brother with info and he installed pressure guage.

After he ran the car for a while he shut it off. It lost pressure from 40 lbs to 15 lbs in approximately 1 1/2 hours. The oil level also raised.

Should the fuel pressure drop at all?

Does it make sense that the injectors are indeed the culprit here?

Thanks again for any help you can give.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-19-2004, 01:52 AM
Member
 
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 65
Posts: 5,103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
A fuel injector cleaning might help. I use Berryman's Injector Cleaner in the gas tank of my '88 T-bird 302 every year or so, & it might help his if they're just dirty.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-19-2004, 06:20 AM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Arrow

Quote:
Should the fuel pressure drop at all?
Yes, it is normal for it to drop the amount stated over time. But not right away.

What you have is one or more injectors leaking, albeit slowly after shutdown. It can be deposit ridden injectors not allowing the pintles to fully close. If it is leaking so badly that it is going into the crankcase, you need to remove the injector rail from the lower intake-hold it above the intake (don't remove the fuel supply) and have somone turn the key on (not start) and watch for dripping injector(s).

It could also be an injector hanging while running or a bad injector drive in the ECM . To diagnose it without taking it aprt requires a bunch of specialty tools.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 04-19-2004, 07:02 AM
lowROLLERchevy's Avatar
... & Insanity Ensues .....
 
Last wiki edit: The FREE T Bucket plans Last photo:
Join Date: Jan 2004
Location: Western NY
Age: 35
Posts: 937
Wiki Edits: 22

Thanks: 0
Thanked 1 Time in 1 Post
its sounds weird, but an injector can be HORRIBLY LEAKING, but only be making the car run slightly rich at the tailpipe

its because all the leaked gas is liquid form, and despite the pistons "throwing" the gas around while running, it pools on the piston during upward stokes, and rings arent ment to seal gas in, they are ment to seal OIL OUT, and seal vapors in during combustion (pressure sneaks in behind the ring and litealy pushes it to the wall, which is why cylinder walls wear more up top .... combustion pressure pinning the ring to the wall)

but engines ARENT designed to seal liquid fuel ( a very *thin* liquid i might add) in the cylinder during the upward strokes

leaking injector = pooled fuel ... pooled fuel isnt airborn, so it doesnt go out the tailpipe, instead it finds a different escape route .... past the unsealed rings, washing all the oil away and leaving the cylinder walls unlubricated when they need it the most, on the downward power stoke thats MOST abusive to parts in the first place

id say go right ahead and grab an intake gasket set, a load of injector cleaner and dissassemble it all ... get those dirty injectors out and clean them as good as possible ... soak them in cleaner, blast them out w/ low (50psi) air pressure ...... apply constant airpressure to each injector while its "full" of cleaner ... if its a leaker it will squirt fluid

or if u trust this option ..... find out if your part # injectors came on anything new ..... vans or crown vic's w/ 5.0's .... if so ... find a wrecked one at the scrapyard w/ lower miles and just buy the injectors ..... prolly like $50 instead of like 275 for new ones
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 11:22 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.