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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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.

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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.

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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.

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1 Answer

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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.

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1 Answer

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Oct 16, 2009 | 1999 Chevrolet Silverado 1500

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'92 Chevy pu V8 will not start spray in starting fluid and it starts then starts rest of day. sits over night have to go back to spraying with starting fluid. What is the problem? How do I fix it? '92...


With your Clarifications I suggest having the Fuel Pump Pressure Tested as one other gentleman suggested that it is most likely bleeding down overnight. Another possibility would be the Fuel Filter being clogged. The factory recommendation is to change fuel filters every 30,000 miles. Many people do not even know a Fuel Filter exists on their vehicles. Some years back they were near or in the carb. Weak Ignition would be the last thing to look into as the vehicle runs somewhat normally once started and running for a while. Modern vehicles have Electric Fuel Pumps inside the Fuel Tank. This is somewhat expensive to replace but necessary maintenance after many many miles. Good Luck!

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2 Answers

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

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1 Answer

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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.

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2 Answers

1997 Silverado


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