confused and frustated
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confused and frustated
i have a 99 5.4.at start-up i have a diesel sound knock coming from the passenger side of the motor.its gets quieter as it warms up.under load at low rpms when its warm i hear a tapping almost like a exhaust leak.i replaced all broken manifold studs.that got rid of the exhaust leak but i still have the tick.if i let off the gas it stops and if i step on it and run the rpms up i cant hear it either.i cannot duplicate the sound in the driveway while revving it .i layed underneath it and can onl hear a faint noise coming from the bottom end.anyone have any advise on what this could be or a way to trouble shoot this?
also am i correct with thinking if it was a rod bearing it would knock all time or when i rev it also.
i am running motorcraft 5/20 and a motorcraft filter.i changed the oil and saw no shavings.i also have put about 6,000 miles on it doing this.
thanks for any help or advise.
also am i correct with thinking if it was a rod bearing it would knock all time or when i rev it also.
i am running motorcraft 5/20 and a motorcraft filter.i changed the oil and saw no shavings.i also have put about 6,000 miles on it doing this.
thanks for any help or advise.
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Had a similar sound on my 97 5.4L at around 160,000 miles. Couldn't figure it out until at 166,000 miles the wrist pin let go and the piston blew the plug out of the engine. Still had good oil pressure but the loud knocking signaled the end. Hope yours isn't the same thing.
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yeah i checked the plugs after i bought the truck.after reading up on the plug issues i figured i would check them.i hope its not the wrist pin.especially considering i will be towing my camper in a few weeks.
thanks for the input
thanks for the input
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From: Stephensville WI
Had a similar sound on my 97 5.4L at around 160,000 miles. Couldn't figure it out until at 166,000 miles the wrist pin let go and the piston blew the plug out of the engine. Still had good oil pressure but the loud knocking signaled the end. Hope yours isn't the same thing.
A wrist pin issue should not affect oil pressure like your main bearings would.
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You're sure it was the wrist pin that let loose? I'm curious how this was diagnosed. Seems pretty rare to me. A more common scenario would be a head gasket failure, causing coolant in the combustion chamber, causing hydro-lock, which causes a broken wrist pin and launched the spark plug.
A wrist pin issue should not affect oil pressure like your main bearings would.
A wrist pin issue should not affect oil pressure like your main bearings would.
So diagnosis was not complete but circumstantial. I believe the ticking noise which was somewhat sporatic was in fact the pin ovaling out the bearing until it finally let go. Complete rebuild would have have cost me more than the swap.
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From: Stephensville WI
There was no coolant anywhere in the engine compartment or on the plug which was laying on the head still attached to the wire. Still had oil pressure as I drove it up on my trailer to haul it home. Didn't tear into it just swapped the engine for one that had 60,000 miles.
So diagnosis was not complete but circumstantial. I believe the ticking noise which was somewhat sporatic was in fact the pin ovaling out the bearing until it finally let go. Complete rebuild would have have cost me more than the swap.
So diagnosis was not complete but circumstantial. I believe the ticking noise which was somewhat sporatic was in fact the pin ovaling out the bearing until it finally let go. Complete rebuild would have have cost me more than the swap.
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i am using motorcraft 5/20 oil and filter.the noise that bugs me alittle is when i am on the throttle low in rpms.its a tapping its pretty quiet though.but like i said i cant duplicate it in the driveway revving it thats the confusing part. there are no metal shavings in oil either.
