Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 12-07-2010, 08:09 AM
FoxhillRanger FoxhillRanger is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 1
Question 99 3.0 Flex : Cold start engine knock/shake

On cold start the engine has a knocking sound & sometimes shakes as well. After it warms up, sounds go away & runs fine. Sounds like the engine isn't getting oil but I have had the oil pump replaced & also replaced the camshaft synchronizer. Have had other issues & had it checked for a blown head gasket which checked out ok. Have replaced plugs & plug wires. I've heard others talk of Piston slap & Rod knock. What are these & what is the difference? It was suggested that I use a heavier oil, does this sound right or not? Thanks for any insight.
Reply With Quote
  #2  
Old 12-07-2010, 01:34 PM
DHEM DHEM is offline
Resident Red
 
Join Date: Dec 2009
Posts: 1,003
Default Re: 99 3.0 Flex : Cold start engine knock/shake

sounds like piston slap, rod knock doesnt go away. Running thicker oil really would help, it should be rebuilt if its getting loud.

oops meant to say wouldn't
__________________
'05 2wd Ranger xl with the 3.0

MODS-Alpine head unit, throttle cable mod, Black Rock wheels, FX4 lvl II axle swap, pooleo's camo painted bezel and mustang dome, painted/aftermarket headlights/tails fold-a-cover and over 100 hp in stickers

Last edited by DHEM; 12-13-2010 at 05:19 PM. Reason: grammer error
Reply With Quote
  #3  
Old 12-07-2010, 08:37 PM
bassplyer92517 bassplyer92517 is offline
Ford Tough
 
Join Date: Feb 2010
Posts: 309
Default Re: 99 3.0 Flex : Cold start engine knock/shake

Definitely sounds like a piston slap. A piston slap occurs when the piston has too much clearance between itself and the cylinder bore. It mainly is just caused from normal engine wear. I'm pretty sure its not too bad for your engine, just don't be too hard on it while its making the sound.

When the engine is cold the clearance between the two is greatest because the piston has not expanded from heat, but once it heats up the piston will expand faster since it is aluminum and the cylinder is iron. That would explain why it only happens for cold starts.

There is one way I've heard of testing for it though. Turn your engine on when its cold, listen for about ten seconds and memorize the pattern. Quickly shut it off, take out the spark plugs and put a squirt or two of motor oil into each cylinder. Put the plugs back and give the oil a second to reach the piston. Turn the engine on again, if it is a piston slap the sound should be greatly reduced or gone for at least 20-30 seconds.

Last edited by bassplyer92517; 12-07-2010 at 08:39 PM.
Reply With Quote
  #4  
Old 12-13-2010, 02:14 PM
joker515 joker515 is offline
Ford Motor Company
 
Join Date: Sep 2010
Posts: 126
Default Re: 99 3.0 Flex : Cold start engine knock/shake

use lucas oil additive on your next change, see if that helps, i believe what you are expierencing is called a dry start, not only is is bad sounding, it is the leading cause of engine wear... my2cents
__________________
2000;3.0 vulcan;flowtech raptor muffler; no cats;k&n oil filter;goodyear wrangler tires;spectre cold air intake;200 watt pioneer headunit with 2 kenwood jl-80 boxes holding 2 10 inch pyle subs, 2 kenwood 4x6 2ways and 2 polkaudio 4x6 plates and two xplod 3 ways in the doors;plenty of scratches dings and dents, chipped (flashpaq)
Reply With Quote
  #5  
Old 12-13-2010, 02:26 PM
terryduanemiller terryduanemiller is offline
www.shanewootenband.com
 
Join Date: Oct 2010
Posts: 1,896
Default Re: 99 3.0 Flex : Cold start engine knock/shake

timing chain guide?..... lifter (hince the shaking)?...... what oil are you running? anything over 10w30 will cause cold chatter till it's picked up.

Lucas works but its a thick additive and can cause cold start chatter too. I suggest spending few extra bucks on good oil filters, cheapo's can cause it as well.. if you have over 150k miles. I suggest trying lucas (use full quart) but subtract a quart of oil when refilling.. if it doesnt help or stop it, recommend using 2qts 30w and 3qts of 10w30 without Lucas.
__________________
MY BUILD THREAD
1999 MAZDA 2500SE, 2.5L 4-clanger, 5 speed, Green n slow. Rangers as daily drivers since 1988.
ASE Certified Mechanic, Builder of Show Destroying Protouring and Classic cars..

Last edited by terryduanemiller; 12-13-2010 at 02:32 PM.
Reply With Quote
  #6  
Old 12-06-2011, 04:55 PM
DANE DANE is offline
Ford Motor Co
 
Join Date: Sep 2011
Posts: 174
Default Re: 99 3.0 Flex : Cold start engine knock/shake

Terys right get a good filter put a whole bottle of lucas in minus a quart. Mine hasnt done it since
__________________
-DANE

2000 RANGER: 3.0, FLEX FUEL, A.T, 4X2
Reply With Quote
  #7  
Old 12-06-2011, 05:43 PM
Turboman412 Turboman412 is offline
Ford Motor Company
 
Join Date: Jul 2011
Posts: 140
Default

What color is your coolant? Had a similar problem it ran like Crap till warmed up.. when I was pulling a trailer I popped my head gasket. You should check compression just to rule it out

Sent from my ADR6300 using Tapatalk
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine ticking Cold start 98 X Cab 4-Cylinder Tech 6 02-22-2012 02:15 PM
2001 Ranger - Engine Knock / Oil Pressure Gauge / Engine Light zomgtehpwn 4-Cylinder Tech 7 01-06-2012 04:27 PM
Knock noise at start-up ssptank 4.0 SOHC / 4.0 OHV Tech 5 11-21-2010 08:23 PM
KNOCK KNOCK KNOCK !!!! noisy engine AussieExplorer97 4.0 SOHC / 4.0 OHV Tech 2 07-27-2010 02:48 PM
2006 knock sounds when engine start...help ssptank 4.0 SOHC / 4.0 OHV Tech 2 02-13-2010 03:49 PM