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Valve noise on start-up

What causes a valve tap noise upon start-up of a cold engine--Chevy 7.4 liter Vortec?

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Sticky lifters... I had a similar problem on my chevy 350. One quart of Marvel Mystery oil took care of the problem (2 weeks after use).

if that doesn't help, perhaps try some slick-50. The object is to make the lifters free themselves a bit.

Good luck.

Posted on Apr 16, 2008

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Posted on Jan 02, 2017

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Out side unit never stop's running and inside a coil is cold you can hear the gas moving them it. It's on heat blowing cold


If your unit is set on "heat" and indoor unit is blowing cold this sounds like a issue with the change over valve located in outdoor unit, the valve may be stuck or solinoid coil might be faulty, check power to solinoid coil to ensure its energised if so try tapping the valve body sometimes this is enough to free it off if your lucky failing that the valve will require replaced ,

Feb 07, 2016 | Heating & Cooling

1 Answer

I have a coleman heat pump and the indoor unit sometimes makes a squealing noise on start up. It does not make the noise when using regular heat. (no compressor) any ideas?


Hi,
What you are hearing is the refrigerant going through the expansion valve...sometimes they will squeal as the pressure builds...depending on the valve the refrigerant has to push open a check valve and that will cause a noise...
The noise does not mean that you have a problem, and it will not hurt anything... nothing is broken, it just can be annoying...

heatman101

Mar 31, 2011 | Heating & Cooling

1 Answer

Furnace has automatic ignition pilot light comes on for about 10 seconds then goes back out and furnace blows cold air


Check and make sure you have gas on to the unit and to the gas valve in the furnace.. Check for 24 volts at the gas valve at the furance. Check and make sure the knob at the gas valve is in the "on" position. If you have voltage at the valve than the valve has failed. If you have no voltaged at the valve than the circuit board has failed. One last thing you can check if you do have voltage at the valve. When the hot surface ignitor is glowing orange tap on the gas valve with the handle of a screw diver. Sometimes the valve sticks. Of coarse if this works it will probably stick again. Replace the valve in this case.

Jan 25, 2011 | Heating & Cooling

1 Answer

I have a heat pump that when turned on the tube get cold and condensation develops but 45 seconds later cooling stops and compressor keeps running. the coil for the reversing valve is not energized, there...


Sounds like low on freon. The suction line will turn cooler upon first start up. Heat pumps do sound scary but you all ready have cked the reverse valve coil, ck the lines in\out temp. If you can ck temps on your suction line vers press. repost if you need more help.

Jul 10, 2009 | Heating & Cooling

1 Answer

I have a goodman heat pump and i suspect a bad reversing valve


Sounds like reversing valve is stuck or metering device or check valve is stuck open. If it is a scroll compressor on 3 phase you may need to reverse 2 motor leads. try tapping reversing valve with rubber mallet when running. This may have done in last compressor by sending discharge gas to suction side.

Jun 28, 2009 | Heating & Cooling

1 Answer

We seem to have developed a problem with our boiler, worcester 20/25 heatsave. Every time we turn on a hot water tap, when we turn the tap off, there apears to be a loud noise from the boiler or pipes for...


it seams the valve that senses water flow is not operating properly,causing the boiler to keep heating the water when it has nowhere to go,i,e the taps turned off,thus boiling the water.

Jan 12, 2009 | Heating & Cooling

1 Answer

Vaillant combi boiler problem


when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Dec 31, 2008 | Heating & Cooling

2 Answers

Have a combi boiler and the hot water from my taps are running cold to luke warm. My British Gas engineer has told me it is nothing to do with the boiler but is caused by a faulty thermostat cartridge in...


Modern shower valves have an "anti scald device" in them to prevent scalding from to hot water.

They come preset at 120 degrees.

Sometimes they can start to malfunction and all you get is warm, not hot water, they can also be intermittent.

This will only effect the shower valve though, not the other faucets.

Dec 06, 2008 | Heating & Cooling

1 Answer

My Carrier 58dxc is making a loud noise


If your turning on heat and the unit is knocking and blowing cold air, your compressor is having problems in heat mode, could be reversing valve. A tech is needed in your situation. Getting the prob fixed right away will save you dollars..

Dec 02, 2008 | Heating & Cooling

1 Answer

Hi, I have hot water coming through the cold water taps in the house, there is a check valve on the cold water return side of the water heater. could this be the problem? The cold water line feeding the...


i have seen a faucet that has a valve on the end (like your pull up on the shower)back feed the hot water or yes you could have a bad ck valve dan

Jul 23, 2008 | Heating & Cooling

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