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tractorboy
User
Sep 9, 2005, 12:16 PM
Post #1 of 7
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Noise on start up
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2003 Impala 3.4L use 5w-30 oil, pf47 oil filter with anti drain back. When I start the car in the morning , what i think are the hydraulic lifters, clatter for about 6 seconds then go away to a nice sounding engine. The sound is more pronounced the cooler or colder it gets. I looked at the engine block without the oil filter, nothing unusuall. There is a what appears to be a bypass at the top where the filter goes. Push in on it, spring loaded, could this be bad , letting oil to tricle back ? it isn't in backwards is it ? the bypass is at the 1 oclock position above the center stud the oil filter spins on to. any suggestions
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DanD
Veteran
/ Moderator
Sep 12, 2005, 4:25 AM
Post #2 of 7
(2461 views)
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Re: Noise on start up
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It’s likely a couple of lifters that are leaking down over night.
Do you have any history on this engine, things like an intake gasket letting go and dousing the crankcase with coolant?
Something like that could cause some minor damage to a lifters internal valveing allowing it to collapse over night.
The oil filter bypass valve I don’t think would cause this. It’s there to prevent oil starvation if the filter becomes plugged.
It’s not a check valve, like what you would find in an electric fuel pump to hold a column of fuel between the pump and fuel rail.
Dan.
Canadian "EH"
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tractorboy
User
Sep 12, 2005, 5:04 AM
Post #3 of 7
(2456 views)
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Re: Noise on start up
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Nope nothing else just the noisey lifters, which sounds like all of them, not just one or two. I thought it might be the anti-flow back gasket in the oil filter, so I put on a new filter. I was wondering if it could be one bearing, like a main, that could be really out of specs. Also I was wondering if it could be the oil, I use 5w-30. Is it possible that someone is dumping something in the oil like stp or motor honey that would make the oil thicker ?, prank stuff does happen here.
Can I ask you another question....do you have an automotive dvom ? what is it ? is it what you wanted ? is there one you would rather have instead ? also same question s as above ,but for a scan tool. actually that was more than one question
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DanD
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/ Moderator
Sep 12, 2005, 9:56 AM
Post #4 of 7
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Re: Noise on start up
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I’m not sure about the rod or main bearings making the noise, (not without hearing it in person), but they make a definite knock more then a tick.
An automotive DVOM is a Digital Volt/Ohmmeter, I use a Fluke 88 and it’s actually a multi-meter being that it has a 10-amp ammeter and it can also read duty cycle.
As far as a scan tool I have a Vetronix Mastertech and it works well for most things and it has a built in lab scope but the more sophisticated the vehicle get with the electronics, I’m starting to think about buying manufacturer specific scanners, at least for the three north American builders.
Canadian "EH"
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tractorboy
User
Sep 12, 2005, 10:13 AM
Post #5 of 7
(2439 views)
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Re: Noise on start up
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The fluke is one of the meters I am looking at...the Mastertech is nice. I am probably going to do a notebook or palm pilot based scanner. I was thinking of recording the noise, make a 6 second wav file and attach it to this post so everybody can hear it. If I can not attach I will upload to rapidshare or simular and put the link in the post to download....what do you think of the OTC automotive dvom ?
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DanD
Veteran
/ Moderator
Sep 12, 2005, 10:23 AM
Post #6 of 7
(2437 views)
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Re: Noise on start up
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I have never used the OTC meter but they make good units. Almost any style of automotive meter will work ok as long as it has at least a 10megaohm-impedance rated voltmeter you’ll be ok.
Dan.
Canadian "EH"
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tractorboy
User
Sep 25, 2005, 6:32 PM
Post #7 of 7
(2385 views)
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Re: Noise on start up
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I checked my oil pressure. I removed the oil pressure switch and screwed in the pressure guage. At the same time I also checked the oil switch. I plugged the switch back in and layed it on part of the engine so it would be electrically grounded. The car had been sitting all night, I started the engine and the pressure went imediately up to 40 psi. I am wondering if this is the correct way to test. In the oem shop manual they have a pressure guage they attach in place of the oil filter ? Also the manual says 60 psi @ 1800 rpm. Latter in the day I tested again after the engine was warmed up and at idle it was around 38 psi and I do not have a tach, so I just increased the idle and it went up to 45-48 psi. Also the low oil pressure icon came on on the info track display, which was a concern that the oil pressure switch did not work. There was also something that I read that I can not get past. In the block where the oil filter screws on is a releif valve, I have seen it it is about at the 1 oclock possition. In the manual it says that if the oil filter is plugged or...... the valve will open at 10 -15 psi. Well if there is any thing over 15 psi...say like 60 psi, wouldn't the bypass valve be open all the time ? or does the oil pressure on the other side keep it closed, unless the filter is clogged and the only flow is through the releif ?
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