Strange noises, wild oil pressure. Urgent help needed

Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 19th 2011, 11:04pm

So I went to start my van for a quick run to the store, and as soon as I started it I noticed a strange clicking noise coming from the engine bay (it's exact location was hard to pinpoint). I happened to look at the oil pressure gauge and noticed it was fluctuating wildly, anywhere from 40 to 60 psi. After about 15 seconds I shut the engine off, checked the belt and all the fluids, and found that my oil is close to the bottom of the range on the dipstick, and is a rather odd shade of orange-brown. I'm about 50 miles away from 3000 on this oil, so I figure the low oil is to be somewhat expected, but the noise worries me.

It was a tapping noise, that went along with the engine rpms, I think it kinda sounded like a lifter doing something funny. I started the engine back up, and the noise was still there but a bit less pronounced, and the oil pressure was still a bit wacky but not nearly as bad. I made my run to the store, and once the engine heated up, the noise went away.

What I'm thinking is that it's a partially blocked oil passage, cutting off oil to the affected lifter, and causing the fluctuating oil pressure. Once it heated up the oil got thin enough to flow past the blockage. What do you guys think? And do you think it would hurt it to drive the ~40 miles home? (I'm at school).

Also, I drove it to school this morning, I got here at about 7:15 am pst, and it's now 2pm. It wasn't doing anything like this in the morning.

I'll try and catch it on video and post it here in a few. Thanks.

Edit: video here: http://www.youtube.com/watch?v=XXizRVXiTUE
It only does it for a few seconds at the start, but you can hear it pretty well in the video.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby chevymaher » December 19th 2011, 11:39pm

Thing that concerns me is the oils color.Orange.Rub some oil between your fingers see if it slick.Black oil I can handle.Orange sounds like a problem, water or rust getting in the oil.Check coolant for oil.Sounds like a gasket going out.I would love to be wrong though.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 19th 2011, 11:41pm

The oil feels just like it should, and there's no visible oil in the coolant.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 19th 2011, 11:43pm

I should clarify though, it's only a very slight hint of orange. Mostly brown.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Leeann_93 » December 19th 2011, 11:47pm

Regardless, you need to change the oil and filter before you drive it much further.

One, cleaner oil will pump up the lifter quicker and, hopefully, clean out some of the deposits that might be in there. Two, because you need to see what the true color of the oil in the bottom of the pan looks like...
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Chevymankevin » December 19th 2011, 11:52pm

Its a clicking noise? Or a tapping noise? Does the engine run smoothly when its making the noise? Also does the engine have high miles? Also how often do you watch your gauges? Has the oil pressure ever fluctuated before while you were watching? Does the pressure fluctuate while you drive? In the video I could hear the noise but not very clearly is it louder from under the hood ot under the engine?
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby RECox286 » December 20th 2011, 12:05am

Could be as simple as the oil level is low enough that the lifters are starving because of pump cavitation. Do an oil and filter change, making sure

that you have the oil in the proper range, then light the engine off and see what ensues. Keep calm as you do this, it may take a few minutes to

quiet down after the abuse of low oil level. One thing i liked about the Cavalier was the low oil level float switch in the oil pan itself.

I tried to build one into a 350 from misc spare parts, but I got the switch level wrong, and it would only work when the engine was not pumping

oil, otherwise the light was on all the time. So I wired it to the S terminal of the starter and if the level was low the light would illuminate when

the key was turned to START. So it finally did work in a round about way.

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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rolling_Rock » December 20th 2011, 12:27am

Its just low-oil valve train noise... my miata does this all the time when the oil is low -- nothing to worry about, the oil gets low and doesnt muffle the sounds at the top end of the engine, thats all thats happening... if youve ever run an engine without the valve cover on you know the noise...

as you said oil is low, now you got tapping noise... put some oil in it and the noise will stop -- either way its nothing to worry about
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 12:35am

Chevymankevin wrote:Its a clicking noise? Or a tapping noise? Does the engine run smoothly when its making the noise? Also does the engine have high miles? Also how often do you watch your gauges? Has the oil pressure ever fluctuated before while you were watching? Does the pressure fluctuate while you drive? In the video I could hear the noise but not very clearly is it louder from under the hood ot under the engine?


It's more like a tapping. It idles low and rough when it's making the noise, but with gas it's smooth. I watch my gauges like a hawk, it never fluctuates other than with acceleration/deceleration and the power steering. It doesn't fluctuate while at a constant speed. It was louder from under the hood, I think.

I had no choice but to drive home, the noise wasn't audible while driving. Oil pressure at idle was lower than normal, 35 psi where it was normally just over 40 while warm.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby 88astroLT » December 20th 2011, 12:47am

It could be an idler pulley. You said the sound is there only when its idling right?

Also my 97 has this ticking noise, on its stock engine, but it runs almost new. Only difference is no crazy oil pressure. Hmm.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 1:19am

No, the sound was there at all speeds, until it warmed up.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rolling_Rock » December 20th 2011, 2:09am

Rey wrote:No, the sound was there at all speeds, until it warmed up.



ADD-----------------OIL! valvetrain noise due to low oil - 'tis all... Image
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 3:16am

I just added a half quart, and now it's right up at the max line on the dipstick. I think it was so low because the engine had just been running. I'm going to have the oil changed tomorrow at the dealership - I'll tell them to keep an eye out for any water in the oil.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rolling_Rock » December 20th 2011, 3:36am

Rey wrote:I just added a half quart, and now it's right up at the max line on the dipstick. I think it was so low because the engine had just been running. I'm going to have the oil changed tomorrow at the dealership - I'll tell them to keep an eye out for any water in the oil.



How much does the stealership charge for oil changes these days? Image$200? Image
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 3:43am

Heh, that might be about right. But as it were, I don't have the facilities to change the oil myself. I figure the dealership will at least give me the full scoop..and maybe try and sell me a few parts, but oh well. The last place I took it to was a bit sketchy, to be honest.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rolling_Rock » December 20th 2011, 3:48pm

Rey wrote:Heh, that might be about right. But as it were, I don't have the facilities to change the oil myself. I figure the dealership will at least give me the full scoop..and maybe try and sell me a few parts, but oh well. The last place I took it to was a bit sketchy, to be honest.



The astro is one of the easiest vehicles to change the oil on... no need to jack the car up, its high enough, and the fuel filter is easily reached from underneath too -- some people like doing it themselves others don't -- hopefully the dealer wont rape you too bad -- le tme know how much it all cost and what they said... aslo did the clicking stop when you added oil???
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 4:22pm

Started it up this morning, and the noise was quite loud (its only heard on a cold engine). I got a better video of it: http://www.youtube.com/watch?v=6g5E1Mzxun4

I let it warm up and drove to school, I arrived just a few mins ago. Oil pressure was slightly lower than normal the entire time. Perhaps it's just my oil pump going out?
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rolling_Rock » December 20th 2011, 4:31pm

Rey wrote:Started it up this morning, and the noise was quite loud (its only heard on a cold engine). I got a better video of it: http://www.youtube.com/watch?v=6g5E1Mzxun4

I let it warm up and drove to school, I arrived just a few mins ago. Oil pressure was slightly lower than normal the entire time. Perhaps it's just my oil pump going out?



Start with an oil change -- dirty filter will make the pressure lower, though on mah van with 200k+ miles it doesnt sound like yours... also if its 'only heard on a cold engine' - thats more of an indicator of valve noise -- ie when my miata is low on oil (usually one quart low or more) it will make a racket at startup (cold) then as the oil thins out it more easily gets to the top...

any power loss or dirability changes other than the noise?
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 4:47pm

There may be a slight loss of power - so slight that I'm not really even sure.
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Re: Strange noises, wild oil pressure. Urgent help needed

Postby Rey [OP] » December 20th 2011, 10:26pm

Alright, I just got back from the dealership not too long ago. I told them everything I told you guys here - then they reminded me they're just lube techs :doh:

They said there was no coolant in the oil, no metal on the magnetized drain plug, and no metal in the filter. Suggested the erratic oil pressure might be a faulty gauge, which I never considered. As for the knocking noise and low oil level, they opted to put 10-30 in as opposed to 5-30, probably not a bad idea. They also tried to sell me a full transmission flush for $166.33 and a power steering flush for $99.44 :rofl:

So I still don't really know whats going on. I'll start it up cold tomorrow and see if it still knocks..I hope not.
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