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When starting a cold engin the oil pressure light comes on. there is no noise of valves. the light stays on for aprox 2 to 4 minutes before the presure gage shows presure.

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Check theoil level and make sure the filter is new and clean. It is not uncommon for this to take a few seconds to register, but 2-4 min is longer than most. If your worried, have a shop put a tester on the oil pressure sending unit and verify if your getting the correct pressure.

Posted on Apr 01, 2011

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As long as there os no obvious noise you can either pull and try to clean pressure switch or replace the OP switch. Sounds like it's gummed up or connections have corrosion and it takes a little heat to make good contact.

Posted on Apr 01, 2011

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Does the camshaft sensor make the engine light and oil light stay on and make the valves chatter if so does it hurt to drive car


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Oil light comes on and is dinging.


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My 2ltr V6 Vitara has a rattle. Top End noise, it rattles like noisy tappets on start up and gets less as the engine warms up (around five minutes) then it almost stops. So far I have pulled the rocker...


this is not SOLIDS engine, there is no LASH setting, !
the engine has a chain, and a set of hydraulic bucket valve lifters.
the chain can be bad or any lifter, can be dirty and collalpesd.
when the engine is dead and no oil pressure the lifters are normally collapsed, when you start the engine. oil pressure does 2 things
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ever read the manual? its here.
use a stethoscope to find out 1 thing , which is it the chain or lifters making that noise.
ive even runs engine with the valve covers off (messy , use a blanket to catch oil flying) to find the true cause.......

read the 2.5L here. its close. (mech. parts)
read the Alldata virtual FSM.

http://www.scantool.net/software/alldata-diy-1-month-subscription.html

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2003 dodge ram has light tick for a minute at cold start then goes away


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When the engine gets some mileage, say 60 or 70 thousand miles or more, the engine is just not as tight as it once was. What happens is that the lifter loses its pressure when the engine is not running, because there is some wear. When you start the engine, the lifter takes a few moments to pressurize, and makers a ticking noise until it does. The 'ticking' is the sound of the valve being hit by the push rod, which is being pushed by the lifter. Once the lifter is pressurized, the 'ticking' sound stops. This is a very common thing for engines, it will eventually happen to nearly every one.
Sometimes, thin, old oil can cause this. If you have not changed the oil/filter in a while, you should do it now.

This is nothing to really worry about right now, but it is a sign of engine wear. Just be sure to run the proper oil in the engine, and do all the proper maintenance.

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My Audi A4 2009 makes a rattling noise on cold starts which resolves in less than 30 seconds. Dealer says its an air pump. This doesn't seem correct. The noise comes from the front of the care. Does not...


READ THIS (happy ending so far...):
audi a4 2L turbo quattro, manual transmission with 98,000 KM. Perfect conditions, no oil leaks whatsoever.

Left the car off for two weeks in very cold weather (-10C down to -25C). When I restarted, it started immediately but with heavy rattling noise due to camshaft adjuster not getting enough oil pressure. After 3 minutes of warming up (outside temp.: -12C) at very low rpm (below 2,000rpm), I start moving the car. Still hearing heavy rattle noise. As soon as I pass 2,000 rpm, I get a scary red warning, low oil pressure. Turn off the engine immediately. In 1 minute, I re-start the car and the engine lights check ok, so I drive in first gear super slow (1,200rpm) hearing the same rattling noise. After another minute, finally the noise all the sudden disappears and the car starts running just fine.

Called Audi dealer and they told me that in extreme weather conditions, I should warm the engine for 10-15 minutes if necessary before start moving.
Take away: luckily, I didn't screw up the engine since I was using it at extremely low rpm (easy to do with clutch and manual transmission) until the oil reached full pressure. I am pretty sure now that the problem was leaving the car off for such a long time in freezing weather. All the oil flows back to the bottom, and when I restarted it, the cold oil with high viscosity took a long time to reach all the parts of the engine, specially the camshaft adjusters that are actuated by using oil pressure. Next day, the car started at -9C perfectly without making any noise (as usual). Basically, the longer you leave your audi in cold weather, the longer you might hear the rattling noise until the oil reach full pressure inside the engine. My car took 6 minutes to fix it after couple of weeks in cold weather. This makes sense to me; in fact, in the past I only heard the rattling noise after leaving the car off for a couple of days in the winter.
So far, this has had an happy ending....

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1 Answer

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Rattle noise on cold startup from timing cover


That noise comes from the valves.
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If engine is noisy then you have an actual oil pressure concern.Sending unit only reads the pressure. I would recommend you have an actual oil pressure test done to see what your oil pressure is.You didn't mention what engine you have but rule of thumb is 30 psi at 1500 rpm warm engine.

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