Another engine noise, knock, tick question - Land Rover Forums : Land Rover and Range Rover Forum

chrissai · 10-02-2010, 02:04 PM

2003 4.6 89K
Engine is quiet when first started in the morning until warmed up for around three minutes. Its inside the engine and not exhaust related.
Cold idle 38 psi
2000 42 Psi
Hot idle 35
2000 40 Psi
Only code is p0150.
Noise is pretty loud but you can have a coversation while standing next to the truck. Noise follow rpms but does not seem to be present when letting off the accelerator.
It appears to be coming from the drivers side rear of the engine but I cannot determine if its on top or on bottom.
I am hoping that those of you who had slipped liners could advise as to what the sound was like and any other symptoms. I have not lost any coolant and all plugs appear normal. (no coolant in cylinders apparent).
Thank you for any help you could provide!

Disco Mike · 10-02-2010, 02:33 PM

You have a bad oil pressure gauge or you mis-read the hot idle number which is normally between 10 and 14 pounds. Better recheck that again cause you may be ready for an oil pump and accurate reading will help you.

chrissai · 10-02-2010, 03:11 PM

Thanks Mike, I thought that was a little unusual. Is there another port besides the low pressure switch port to check it at? That was a bit of a pain.

Disco Mike · 10-02-2010, 03:14 PM

Only what is down by the oil pump, I have been told, it is better to hook into where the factory pressure switch is instead of the other port.

chrissai · 10-02-2010, 05:20 PM

Ok, I just bought this rover so I dont know any of its history. I hooked up another oil pressure gauge and found the same pressures. I then drained the oil and installed atf and found that the pressure at idle was 14 psi. During that time the noise appeared to be louder than before. After 30 minutes I drained the atf and installed delo 15w40. The pressure is back to 14 psi at hot idle. I assume the guy who sold it to me installed a few bottles of lucas or similar to see if its helped the noise. Any ideas?

Disco Mike · 10-02-2010, 06:27 PM

It is an 03, have you checked with Rover to see if your vin is on their hit list for a failing oil pump/engine problem.
Don't assume anything at this point, keep and eye on it for any changes.
Where is the noise coming from, top or bottom?

chrissai · 10-03-2010, 12:50 AM

Its hard for me to tell if its coming from the top or the bottom. If I were guessing I would say bottom because its louder from under the truck. Its outside the vin list.

Disco Mike · 10-03-2010, 04:47 AM

If from the bottom and with some of those weird oil pressure readings, I would think the ring gear in the oil pump has broken. When this happens, the pump will still work, for awhile but it does vary pressure and is noisy.

chrissai · 10-03-2010, 10:03 AM

Using a sonic ear it does seem to be toward the rear of the engine.

PTSchram · 10-03-2010, 10:21 AM

Check the flywheel attachment to the crank, this can often sound like a bad lifter.

chrissai · 10-03-2010, 10:39 AM

Thanks for the tip PT but would it only happen when warm 4 minutes after startup?
Thanks again.

PTSchram · 10-03-2010, 11:00 AM

Quote:

Originally Posted by chrissai

Thanks for the tip PT but would it only happen when warm 4 minutes after startup?
Thanks again.

Beats me, but it's a place to investigate.

The time lag does seem to be temperature related though as they seem to warm up in about seven minutes.

chrissai · 10-03-2010, 03:04 PM

Ok, checked the flexplate to crank and that seems to be fine. Would you think this is a cam / lifter issue or a slipped liner?

chrissai · 10-10-2010, 09:36 AM

Update.
After listening to every inch of the engine I could using a scope I determined that the noise was coming from the drivers side at Cylinder 3 or 5. At this point I was fearing the worst. Just for fun I added one half pint of seafoam to the crankcase. I know this is not a good idea but I was about to rip the engine from the chassis and begin disassembly. I drove the truck around for about 10 minutes and noticed that the tick was much softer. This morning when I started the truck I raised the rpm's up to 2000 and kept it there while it warmed up. The tick was not there even after 20 minutes. Keep in mind that the tick would always start after about three minutes from cold start. Once I let the engine return to idle the tick started again. So it appears that I have a lifter issue

beamacvt · 10-10-2010, 03:49 PM

what's your temperature like when hot? have you replaced the t-stat?