Question about 1999 Chevrolet Silverado 1500

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My 1999 Silverado has engine knocking when starting. Using Mobil 1 and good filter. Any suggestions?

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Most engine knocks/noise is caused by worn rod/main bearings or piston noise, you are sure this is not a valve follower tap? in any event unless it gets worse I would not be concerned, most of the knock noises are piston related and will not cause early failure of the engine, if it is deep hard knock u have a failed crank or rod bearing, this must be repaired as it will only get worse.

Posted on Sep 30, 2010

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Check that the spark plugs are the exact measurements required and they match one another. Other than that - your headers may need to be checked/cleaned.

Posted on Sep 30, 2010


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1 Answer

I put in mobil 1 10w 40 oil in a 2004 lincoln avaitor and its still knocking...what oil should I use now?

If it is knocking you have bigger issues!

There are several "knocking" noises an engine can make. Most of them are not good. A good tech with a trained ear will be able to help narrow down the possibilities.

Some possibilities are a spun bearing or a rod knock. If it is either of these it is terminal and no oil will help. An engine rebuild or engine swap will be the only fix.

Feb 26, 2012 | 2004 Lincoln Aviator

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I have a 1999 Chevy LS 2500, when I start it cold it struggles to accelerate and occasionally something knocks when cold and losses power. Even if I let it warm up the problem persists for about a mile....

Number of problems it could be.
1. Clogged or bad fuel pump/filter
2. Plugged catalytic converters
3. Tune up, air filter, plugs & wires
4. Vacuum leaks
5. Bad cam / crank sensor
Sounds like it's starving for either fuel or air.

Jan 03, 2018 | 1999 Chevrolet Silverado 2500

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2000 silverado 4.3 V6. Replaced feul pump and niw it starts but it takes 3-4 cranks in the morn to start it and then it runs very rough untill it has ran for 1/2 to 1 hr. Also have replace fuel filter...

The rough running should have caused the check engine light to come on. It would be a good idea to goa ahead and scan the engine for trouble codes. The rough running could be a number of things. The codes would help us pinpoint the correct part ot replace, rather than start replacing parts until we get lucky and hit the right one. That could be very expensive.

Jan 01, 2011 | 1999 Chevrolet Silverado 1500

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Replaced both knock sensors in 1999 silverado 5.3L. had computer re-programed for updated bulletin that was supposed to help engine knock and bring false knock codes from coming on. after a couple days,...

If the Knock sensor wire is located near the Ignition coil wiring the electro magnetic interference from the Ignition coil can rub off on the knock sensor wire causing the brain to think the knock sensor is sending a code.

You can place a millivolt meter across a knock sensor and tap it with a screwdriver and read voltage. If it doesn't read a voltage the sensor is bad. Its job is to generate a voltage.

Also, Using a timing light the distributor must be set to spec, if not this will trigger the knock sensor. Another trigger could be a bad temperature coolent sensor screwing with the fuel and timing, causing a knock. Some bad coolent temp sensors do not display a code when they're at fault, some simply slip under the radar. Usually when the temp sensor is bad the engine will not idle properly, or hesitates in most cases. The knock senser must have a good ground to the head or block, Do not use any thread tap or compound that would prevent a ground of the sensor.

Jun 04, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

I have some noisy hydrulic lifters that just started. They are only noisy when the engine is cold or it has sat for more than 5 or 6 hours. Willa synthetic oil or oil additives help with this? The truck as...

What you want to do is find a shop that sells BG products. Ask them for part number 210 (engine flush) & part number 110 (MOA ((motor oil additive)) ) . First install the oil flush and moa into your oil filler and run motor for 30 min AT IDLE. Now drain the oil from the crank case and install new filter and castrol 5w30 non synthetic oil. Then run the motor for 15 minutes AT IDLE. Now drain that oil and install new filter. Now goto part store and get MOBIL 1 0w30 and preferably a factory GM oil filter. Install the oil and filter and put one more can of MOA into crankcase. We do this service at our shop ($250). You can do it for about $70. We suggest always using mobile 1 , it is a far superior product. The 0w40 takes no time to get to the lifter upon start up since its so light. once you reach operating temp the viscosity is factory...good luck

Jan 06, 2010 | 2005 Chevrolet Silverado

1 Answer

2001 silverado - My engine knocks for a few

You may have a bad intake manifold gasket, which is leaking the antifreeze in to your engine. Note" Antifreeze is corrosive to the engine bearings" and the knocking your getting from the engine may be worn connecting rod bearing and the pistons are knocking till it warms up and expands to take up the space the worn bearings created. Replace the faulty gasket, change the engine oil and filter as much as possible to till you address the leak and add Restor engine treatment and Lucas oil treatment for now. This may stop or slow the knocking for now, but your going to have to tear the bottom end down and replace the crankshaft and connecting rod bearings if the knock has not gone away. As the weather starts to get colder, your going to have to warm up the engine before you start to drive, getting hard on the engine while it's still cold may cause the bearing to slip and then your looking at a bigger and more expensive job. Good luck and keep me posted.

Oct 28, 2009 | 2001 Chevrolet Silverado

1 Answer

What kind of oil will maximize performance and what is the most efficient type of oil to use

by far the best oil for this is full synthetic, just use the weight recommened by GM for your trucks engine, which is most likely 10W-30W any major brand will do, i use Mobil 1

Oct 16, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

2000 CHevy Silverado misfire code

It is probably the computer as much as I would hate to say it.

Aug 31, 2009 | 1999 Chevrolet K1500

1 Answer

1999 Silverado 5.3L hard to start right after turned off

First check your air filter, and change if needed. Check your engine ground connection. Check for loose connections in the ignition sysem. Check your idle control system/ sensor. Good luck, and let me know what happens.

Jun 01, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

1997 Silverado

no gas in the engine
faulty tank switch if you have dual tanks
in tank something blocking the filter
fuel filters clogged
3 filters
one in engine
one located on chassis by gas tank
one located in the tank called sending unit this has filter on it
fuel injectors need cleaning

Jun 02, 2008 | 1999 Chevrolet Silverado 1500

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