knocking at start

[citrusfizz]

Hi Everyone. First time poster here. hopefully someone can give me some guidance. i got a Ranger 99 4.0l v6 2 wheel drive.

i got this problem that's been happening for about a year. it hasn't developed into a huge problem but i fear if i don't' fix it, that it will.

let me TRY to explain.

when i am stopped and i take off i heard a couple knocks. not engine knocks, no more than 2 or 3 knocks and not everytime. happens more when i am going up a hill from a stopped position. and it only happens from a stopped position. after i am going more than 10mph it will not happen no matter how hard i hit the gas. it diffinetely sounds like metal hitting metal. and its not when switching gears. again within the first 10mph. if i hear the first knock i can almost predict the next one depending on the momentum of the truck.

the other day it rained and it seemed like it happened way more frequently and today i don't even think i heard it. this could very well be a coincedence. last time i took it in the mechanic said i could stand to flush my tranny and my differential.


any ideas out there?

 

[96Greenster]

Does it sound like pinging? im pretty sure it is called detonation aka spark knock. My 99 4.0 does that too. Never got rid of it, mine is loud and for long periods of time. Try some Lucas fuel injector cleaner it may help/disapear your pinging. My 97 grand marquis had spark knock too, after a couple of months of using lucas every tank full, it disapeared pretty much everything.
jus my thoughts...

Oh yeah and welcome to TRS....

 

[citrusfizz]

not to be rude but read my post again i realllly think its after the engine somewhere