Go Back   F150online Forums > Powertrain & Mechanical > V8 Engines
Sign in using an external account
Register Forgot Password?
Register Photos Vin Decoder FAQ Members Search Today's Posts Mark Forums Read Vendor DirectoryGarage

Welcome to F150Online Forums!
Welcome to F150Online.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the F150Online Forums community today!





Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 06-05-2002, 07:00 PM
Junior Member
Garage is empty, add now
 
Join Date: Jun 2002
Location: pace, florida
Vehicle: 1997 ford f150
Posts: 3
Exclamation new engine noise on high mileage 4.6

I have an 1997 f-150 with 155K trouble free miles on it....however this week this has changed. While driving with the a/c on, I noticed a "knocking" noise. I switched off the a/c and the noise stopped. Furthermore, the noise would only occur when the a/c compressor was engaged. I made the 800 mile drive from Viginia to Florida without running the a/c thinking if the compressor was abount to lock up I did not want to throw the serpintine belt. In Fla, a local a/c shop said the problem wasnt the a/c at all but possibly the timing chain. The noise only comes after the engine has run for 2 plus hours and appears to be coming from the left side (when looking at the engine). The local ford dealers are to busy to look at it untill late in the week. No service mgr that I could find on the phone has experienced the same symptoms...any ideas? I got a long trip ahead of me back to Va on Sunday.

Last edited by jimduke; 06-05-2002 at 08:47 PM.
Reply With Quote
  #2  
Old 06-05-2002, 07:33 PM
Senior Member
Garage is empty, add now
 
Join Date: Apr 2002
Location: Dallas
Vehicle: 2003 Ford F150
Posts: 1,997
ticking?

you might check the plugs on that side,one could be backing out and is getting ready to come out ,threads and all
Reply With Quote
  #3  
Old 06-05-2002, 08:43 PM
Junior Member
Garage is empty, add now
 
Join Date: Jun 2002
Location: pace, florida
Vehicle: 1997 ford f150
Posts: 3
Ticking was a bad choice of words...knock is more like it.
Reply With Quote
  #4  
Old 06-06-2002, 01:16 PM
Senior Member
Garage is empty, add now
 
Join Date: Jul 2000
Location: Houston, by way of every major city in America.
Vehicle: 1998 Ford F-150
Posts: 5,075
Send a message via AIM to 98SCREAMER
Exclamation

Mine has had an erratic cowbell sounding knock at idle for about 45,000 miles. I first noticed it after the timing cover gasket was changed at 35,000 miles. It doesn't get worse or better depending on a/c being on or off. Is this what yours sounds like?? Mine seems to have no rythym, doesn't follow the engine idle. It doesn't seem to be hurting anything, so I just forgot about it. I asked around at an f150world get together, and they said these engines just do that??,,,,98
__________________
1998 4.6 F-150 Super Cab. Over 136k and still going strong.
Reply With Quote
  #5  
Old 06-06-2002, 01:19 PM
Senior Member
Garage is empty, add now
 
Join Date: Jul 2000
Location: Houston, by way of every major city in America.
Vehicle: 1998 Ford F-150
Posts: 5,075
Send a message via AIM to 98SCREAMER
You also should check your a/c compressor mounting bolts, mine were loose and it caused all kinds of symptoms. Squealing belt, a buzzing noise on heavy acceleration, etc...etc...
Reply With Quote
  #6  
Old 06-06-2002, 11:11 PM
Junior Member
Garage is empty, add now
 
Join Date: Jun 2002
Location: pace, florida
Vehicle: 1997 ford f150
Posts: 3
Talking I FOUND THE NOISE!!

Turns out it was the belt tensioner. Just as was about to leave it with a ford service mgr, I noticed the tensioner jump ever so slightly with each knock...whew! $49.05 for OEM part, 30 minutes for me to install it and the ol gal is as quiet as can be.
Reply With Quote
  #7  
Old 06-07-2002, 12:08 AM
Senior Member
Garage is empty, add now
 
Join Date: Jul 2000
Location: Houston, by way of every major city in America.
Vehicle: 1998 Ford F-150
Posts: 5,075
Send a message via AIM to 98SCREAMER
Thumbs up

Glad you found it!! Stuff like that will drive you nuts,,,,98
Reply With Quote
  #8  
Old 06-07-2002, 01:02 PM
Junior Member
Garage is empty, add now
 
Join Date: Oct 2001
Vehicle: 1997 Ford F-150
Posts: 25
I have a 1997 F-150 4.6L king cab Lariet with 94,500 miles on it. Only thing I have ever had to do is a rear seal. However, about 20,000 miles ago, when I turn on my air conditioner I get a rapid clicking sound. I looked at all the pulley and watched the belt motion and on the compressor it looked like it would skip while turning, almost as if the clutch in the compressor was not working correctly. I am getting no air right now, and the clicking is really loud. Now that summer is coming I am going to look at this a little more closely. Is the sound you are hearing a "Clicking" or A a "thud"?

Rick
Reply With Quote
Old 06-07-2002, 01:02 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 02:52 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
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details