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2002 ford ranger edge v6 3.0 auto trans 207k miles. Idk what the sound is. I do have p0171 bank 1 code so the engine is shaking and running rough. listen for the knock in the video
Also its at idle. I don't hear it get louder and higher rpm maybe because the fan is loud too. It seems the knocking quiets down on a colder engine.
Last edited by omgitzjojo; Oct 29, 2020 at 10:09 AM.
When engine is COLD, remove fan belt from crank pulley
Start engine
Engine bay will be very quiet with no fan
See if you can localize the noise, could be exhaust manifold leak
Without fan belt there will be no water pump or alternator, so battery light will stay on, and do not run the engine longer than 2 min, 90seconds is better
You can repeat test as much as you like after engine is COLD again
If you have a helper have them put their hand over tail pipe to increase back pressure in exhaust system that can help ID an exhaust leak easier
Exhaust leak at manifold will cause "false" lean on that bank
Not sure what to say then, it you don't want to do any testing then sell the Ranger or replace the engine, diagnostically those are the only two choices with what you know at this point.
An exhaust leak and connecting rod bearing failure make the same sort of "knock" noise, one is easier to fix than the other
how would i identify the exhaust leak? What should i look or listen for when taking the belt off and covering the exhaust? Also couldn't it be intake manifold leak?
This is not a good sign, usually means rod bearing is the source of the knock, cold thicker oil reduces the noise it makes, as oil heats up it thins out and knock is more noticeable
Usual way to test for rod knock is by disabling spark plug on each cylinder one at a time with engine idling(and knocking) and if knock goes away then the cylinder with no spark is the one thats got the bad rod bearing
Bad connecting rod bearing makes the "knock" noise when a cylinder fires, it forces the "loose" bearing down against the crank journal and makes that noise, disabling spark prevents firing so less or no noise
No, intake leak makes a sucking noise that would be constant because intake vacuum is constant with engine running
Carbon build up will cause "pinging" also called engine knock, but is a different higher frequency sound, and would come after engine is warmed up
Simple way to test for this is to put in some 91 or 93 octane gasoline in the tank to mix with the, I assume, 87 octane regular gas
This will take pre-ignition, pinging, off the table as the noise, or tell you it was the noise if noise goes away
An exhaust leak will get louder and more noticeable with tail pipe flow restricted
The engine is hot now. The sound has gone away. idk whats going on. I got a better sound of the knock. Also noticed a burning smell and saw smoke coming from exhaust. Take a look. It was a little bit. not real thick or cloudy.
You will hear it
And don't plug the exhaust or engine will stall, best case, worst case is you will make the leak bigger or blow off a connection
Just restrict the exhaust a bit to make the leak more noticeable, you can often feel the leak point on your hand as exhaust exits with air burst, but be careful exhaust is HOT
well ron... My buddy checked my oil and saw it was too high. So I guess last time i changed oil about 4k miles ago i put too much in and damaged then engine ):
Burning from engine. So i guess im burning oil now...
It would have to be way over filled to cause engine damage, you would have be at least 3 quarts over filled and you would have got oil gushing from dipstick tube in most cases as crank "whipped up" the oil it was in contact with
well then wtf? My dumbass friend's dad said me overfilling it would have done it. I mean 3.0 only holds 4 1/2 quarts and i bought a 5 court jug of oil. His dad sounded so sure that i fucked up. Idk what to do. He was the guy who would put my fan belt on.
Worst case the knock is the bearings on the crankshaft. Those lil C shaped bearings where the ends of the pistons attach to the crank. When those have play in them and the piston fires down it makes a knock. May need to pull the engine and flip it upside down for easy access. Wonder if its possible to just drop the oil pan and replace those bearings from under the truck? All the videos I've seen on it the engine was out.
Too much oil can foam up I read. If the oils too high and its getting sloshed up in the bottom end it can make a foam that has air pockets.
If it is rod knock I'd try not to drive too much until you can overhaul that bottom end. It may just be a little loose now but if that thing breaks and throws a rod that's usually catastrophic. Kiss that block goodbye. Catch it early where all it needs is new bearings.
how would i go about testing this? I also found that my steering wheel and seat vibrate a lot when i accelerate, but after about 2k rpm the shake goes away. I also noticed a good smell of gas but it was on a cold engine when its about 60 degrees out maybe thats why.
Last edited by omgitzjojo; Oct 30, 2020 at 12:59 AM.
