strange engine sound at 1500-2500 rpms
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94 Accord EX strange engine sound at 1500-2500 rpms
A month or two ago I changed the coolant in my 1994 Accord EX -Sedan.
While reving up the engine to heat up the coolant faster I noticed a strange engine
tapping or knocking sound around 1500-2500 RPMs. If I goose the throttle it
seems to be even more noticeable...like a dieseling sound.
The dealer mechanic said it sounded like piston slap. A second dealer while in NC said he thought it sounded like the balancer shaft belt wasn't set right.
When I returned home to NY I had my dealer look at it and he a bunch of mechanics listened to it They took off the valve cover and front (top) engine cover and said everthing looked ok.
But how could they have checked the balancer shaft belt without removing the lower engine cover(crankshaft pulley)? Is it possible? My timing belt / water pump was changed 2 years ago by them around 92000 miles. I now have 112K miles and although the engine runs fine there is still this tapping sound when in neutral (at 2K rpms or so).
The dealer diagnose now is main or rod bearing problems. Most likely Main engine bearing.
How could I have this problem on a car
that since new I have only used Mobil 1
5W30 Oil??? Changed between 5 - 6000 miles???
Would going to a heavier weight oil help (5W40 or 10W40)?
They say that the next step would be to drop the oil pan and take a look.
The dealer also said a mis-aligned balancer shaft belt would cause engine vibration. Even off 1 notch??
Any expert Honda mechanics out there??
Your comments would be appreciated!
Thanks,
Michael
While reving up the engine to heat up the coolant faster I noticed a strange engine
tapping or knocking sound around 1500-2500 RPMs. If I goose the throttle it
seems to be even more noticeable...like a dieseling sound.
The dealer mechanic said it sounded like piston slap. A second dealer while in NC said he thought it sounded like the balancer shaft belt wasn't set right.
When I returned home to NY I had my dealer look at it and he a bunch of mechanics listened to it They took off the valve cover and front (top) engine cover and said everthing looked ok.
But how could they have checked the balancer shaft belt without removing the lower engine cover(crankshaft pulley)? Is it possible? My timing belt / water pump was changed 2 years ago by them around 92000 miles. I now have 112K miles and although the engine runs fine there is still this tapping sound when in neutral (at 2K rpms or so).
The dealer diagnose now is main or rod bearing problems. Most likely Main engine bearing.
How could I have this problem on a car
that since new I have only used Mobil 1
5W30 Oil??? Changed between 5 - 6000 miles???
Would going to a heavier weight oil help (5W40 or 10W40)?
They say that the next step would be to drop the oil pan and take a look.
The dealer also said a mis-aligned balancer shaft belt would cause engine vibration. Even off 1 notch??
Any expert Honda mechanics out there??
Your comments would be appreciated!
Thanks,
Michael
slow lane cruiser
Joined: Sep 2003
Posts: 110
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From: NC
The EGR valve going bad won't cause tapping. (Exhaust gas recirculation valve) Balancer Shaft? Harmonic Balancer perhaps, again no.
Sound like valve lash. Get the valve clearances checked out, IMO that's what it sounds like the problem is.
Good luck with it man, but I must say for that many miles on that year of honda a little valve tap is not uncommon.
Sound like valve lash. Get the valve clearances checked out, IMO that's what it sounds like the problem is.
Good luck with it man, but I must say for that many miles on that year of honda a little valve tap is not uncommon.
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just something to think about.
this all hapenned after u did the coolant change right? im just guessing you probably did not do the coolant flush correctly, say maybe, just maybe you developed air pockets in your cooling system and maybe when it (air pockets) reaches the waterpump, you hear the engine noise that you are hearing.
this all hapenned after u did the coolant change right? im just guessing you probably did not do the coolant flush correctly, say maybe, just maybe you developed air pockets in your cooling system and maybe when it (air pockets) reaches the waterpump, you hear the engine noise that you are hearing.