4.6 Engine knock.
#1
4.6 Engine knock.
Well we got the truck with 30,000 on it now it has about 3X,XXX on my 4.6 Regular Cab. Ever since we got it, it has had the slightest, lightest engine knock. I mean you can BARELY hear this but I can so It drives me insane. Im almost 100% sure its an engine knock. It runs fine just that, I was thinking about adding octane booster or 91 fuel and see what happens but I dont know yet, help?
#2
Sure its not an exhaust leak? You can check for a rod knock by disconnecting one injector at a time and listen for the noise to stop or lessen when the suspect cyl is disconnected. Get an inexpensive mechanics stethescope and by placing the probe on different areas of the engine you should be able to find its source. Could be a chain tensioner as well. Harbor Freight sells a stethescope for around $6.00.
Last edited by DYNOTECH; 02-18-2010 at 04:57 PM.
#3
#4
could be spark knock mostly caused by bad gas, or if you have a programer a tune with too much timing. now i'm not callin you a lire but to me from the way you describe it, it doesn't sound like engine knock cause trust me you will know engine knock. it could also be injectors i have and 03 4.6l and mine are quite noisy.
#7
i'm not saying ignore it, i'm just saying that the way you describe it, it doesn't sound like knock TO ME. when i think of knock i think of rod knock which sounds like knock on a wooden table, when i think of spark knock or ping which sounds like a ping, or a short ringing noise, and when i think of tick it sounds like a tick, tick, tick of a clock. now does it sound like any of these, also like GLC asked what are the conditions that it becomes noticeable. hope this helps.
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#9
It does it in series, like every a couple times in a row then stop for the same amount of time then a couple knocks. Its only on the passenger side, its very light knock enough that you can hear it inside but step a couple feet away then you cant hear it. Motor runs smooth, and you cant hear it in the exhaust.
#10
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#12
You still haven't addressed the CONDITIONS........
Idle in Park? Idle in gear? Low RPM's? High RPM's? Light load? Decelerating? WOT? Low speeds? Highway speeds? Illegal speeds?
Is this a bit clearer?
Higher octane will NOT HELP ONE BIT if it's not spark knock. This only happens under load.
Idle in Park? Idle in gear? Low RPM's? High RPM's? Light load? Decelerating? WOT? Low speeds? Highway speeds? Illegal speeds?
Is this a bit clearer?
Higher octane will NOT HELP ONE BIT if it's not spark knock. This only happens under load.
#15