4.6L Compression Testing... - Ford Truck Enthusiasts Forums

1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

4.6L Compression Testing...

LinkBack Thread Tools Search this Thread
Old 10-18-2010, 03:34 PM
JonathanN's Avatar
JonathanN JonathanN is offline
Posting Guru
Thread Starter
Join Date: Dec 2009
Location: Garden City, KS
Posts: 2,265
JonathanN has a great reputation on FTE.JonathanN has a great reputation on FTE.JonathanN has a great reputation on FTE.JonathanN has a great reputation on FTE.JonathanN has a great reputation on FTE.
4.6L Compression Testing...

Alright, guys... you probably haven't seen me in here before because I hang out in the 7.3L and Super-Duty section of the threads. I'm kinda ignorant when it comes to gassers so I need a little help. I have a buddy who has a 4.6L in his Crown Victoria (it was an ex-cop car and was regularly maintained)... it's not an F-150, but it's the same motor. Anyways, he's noticed that in the past 3000 miles, it's used up over a quart of oil. It's got 145,000 miles and it doesn't smoke (at least, not enough to be noticeable)... we're gonna check out the cooler first to make sure it's not leaking oil into the coolant, but if not, we're gonna do a compression test. I found a pretty good writeup on testing the compression here, but I would like to know what "within specs" is for little or no oil consumption... I know each cylinder should be within 10PSI (or 75%) of eachother, but even if they were, they could be weak enough to burn oil. Any info I could get off y'all would be appreciated! Thanks, guys!
Reply With Quote
Old 10-18-2010, 04:21 PM
kaboom10's Avatar
kaboom10 kaboom10 is offline
Elder User
Join Date: Dec 2007
Location: royal oak, mich
Posts: 842
kaboom10 is starting off with a positive reputation.
What I got from AllData. The indicated compression pressures are considered within specification if the lowest reading cylinder is within 75 percent of the highest reading.
Reply With Quote
Old 10-19-2010, 06:04 PM
n3up's Avatar
n3up n3up is offline
Senior User
Join Date: Jan 2002
Location: Aston Pa USA
Posts: 210
n3up is starting off with a positive reputation.
A quart in 3000 miles really isn't a whole lot of oil use, especially with 145000 on the clock.

Just confirm there's no leak and drive on.....
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Frame Swap from a Crown Victoria JennifeKillby 1948 - 1956 F1, F100 & Larger F-Series Trucks 13 02-04-2014 09:58 AM
EV1 Injector Revamp and Install Evan_P 1987 - 1996 F150 & Larger F-Series Trucks 2 06-07-2013 08:10 PM
Crown Victoria P71 ?????? Loud4.9 General Automotive Discussion 12 09-10-2011 07:52 AM
Cop cars- Caprice vs. Crown Victoria bodabdan Ford vs The Competition 76 10-17-2009 10:12 PM
4.6L vibration and rumbling at acceleration CVTom Modular V8 (4.6L, 5.4L) 9 10-26-2005 01:43 PM

Go Back   Ford Truck Enthusiasts Forums >

1997, 2001, 46, 46l, 75l, checking, compre, compression, f150, ford, jon, spec, ssion, test, testing

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

All times are GMT -5. The time now is 01:11 PM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.