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Unread 02-12-2006, 04:43 PM   #1
BigYellaJeep
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1998 TJ Wrangler 
 
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Engine problems..

It makes four sounds right now..

1: tisking that increases with throttle
2: knocking above 2K rpm
3: loud knocking when no gas is applied, but in gear and driving around (coasting in gear).
4: High pitch squealing every now and then...don't think it is a belt since I just checked those.

Possible problems that I can conjure up with some knowledge of past or present issues...

1: Exhaust header gaskets are too thin or are bad, so knocking from that.
2: Tranny problems (tranny has been bad for a while now)
3: Broken rod in a cylinder.

Is it wise, or possible to unplug a spark plug from a cylinder to see if it is the culprit? No oil is mixing with the antifreeze.

Also, the other day I noticed when trying to put it in gear, the gears in the tranny seemed to still be moving....

Anyone care to lend a hand in helping me?

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Unread 02-12-2006, 07:51 PM   #2
Traveller
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You've already checked the oil and coolant, which is good. You should also check your plugs and make sure they are all uniformly colored.

You can diagnose a faulty cylinder by unhooking the sparkplug wires one at a time while the engine is running. Make you don't touch anything but the wire, or you're likely to get a good jolt.

Get a timing light and make sure the timing is within spec.

Make sure you are getting good oil pressure. If one of the rods were broken it would have found it's way through the block or oil pan by now, but if it is a rod knock, you're going to be looking at a fair amount of work.
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Unread 02-12-2006, 10:27 PM   #3
BigYellaJeep
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Thanks for the input.

Found that the tranny was low, if not empty, on fluids. That probably doesn't help, lol. Think I have a leak in it, since I had topped it off not two months ago..
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Unread 02-12-2006, 10:59 PM   #4
bobjp
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I don't think it is an exhaust gasket, although that could cause the tapping that you hear.
I am thinking the tapping you are hearing is caused by the valve train's lack of oil pressure. Do you have an oil pressure gauge? The loud knocking could also be caused by this.

Pulling a plug wire to see if the knock stops is not fool proof. Even if that cylender is the problem, pulling the plug may not stop the knocking. However, if it does then you know you have found part of the problem. So I would go ahead and do it. It won't hurt anything if only done for a little bit.

It sounds to me like the problem is with your engine not with your transmission, but I can't be certain without being there.
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Unread 02-12-2006, 11:00 PM   #5
bobjp
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So the tranny fluid didn't help at all?
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Unread 02-12-2006, 11:09 PM   #6
BigYellaJeep
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Haven't tested it yet bobjp. Didn't have any fluid on hand. Getting some tomorrow.

I have a wetline oil gauge. In the morning when it isn't warmed up, it spikes and stays around 60psi. After warmed up, it will idle around 15-20 psi, sometimes dropping lower if the rpms drop too low.

I know for sure, that I can wiggle the clutch foot that sticks out of the tranny, and that it makes a "knocking" sound just by playing with it. (With the engine off.) With the engine on, that thing is knocking, however, I still have knockings coming from the engine as well, on the driver side, towards the front.
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Unread 02-12-2006, 11:14 PM   #7
jwicker
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Just an odd suggestion....but make sure the fan blade is not hitting the lower radiator hose.
I had a motor mount give out and that was the first indication.
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Unread 02-12-2006, 11:28 PM   #8
BigYellaJeep
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Nope, not hitting any hoses. I checked earlier..I wish it were just that, lol.
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Unread 02-13-2006, 04:07 PM   #9
bobjp
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What about a stethescope? I don't know where to get one, but they can be used to located a knock.
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Unread 02-13-2006, 06:23 PM   #10
BigYellaJeep
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I'm going to use a water hose...heard that works as well.
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