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Knocking sound in engine. I have a '99 Ford Ranger 4.0L w/165K miles. Lately I've been hearing a slight knocking sound particularly during idling and the engine warm. The sound seem to disappear as I press on the gas pedal. I shorted out the cylinders one a time but it didn't affect the sound. My oil pressure is good, no overheating and the vehicle seem to run fine at any speed. At slow, moderate or even freeway speed, the noise is undetectable. I've always used Pennzoil 5W-30 oil and change oil at 4K mile intervals. Is this anything to be concerned about?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 432 Answers

SOURCE: I HAVE A 2008 INFINITI M35 (RWD). I GET THE OIL

You dont say how many miles are on the car.The 5w was for a fresh tight engine.
Mine was the same but now with higher miles I went to the 10w-30 also ( Castrol Syntech) and I wait for the engine to warm up before putting it in gear.
It will be fine.

Posted on Oct 24, 2009

  • 44 Answers

SOURCE: I have a 2003 silverado 1500, 2wd with the small

check oil sensor it is probably coincedence that you fueled at the same time

Posted on Sep 09, 2010

mikek92580
  • 378 Answers

SOURCE: I Have 02 GMC DENALI XL AWD 6.0 vortex. I am

it is a lifter sticking till motor gets warm it happens in time i know a trick put i help so much for free.it will be fine try a highmile oil and check it every fill up my be low.

Posted on Jan 26, 2011

  • 215 Answers

SOURCE: I have a 1990 Ford

Best guess with the information provided is restricted flow of the catalytic convertors.At higher speed the rpm's stay consistant. If the cats are not allowing the exhuast to push thru unrestricted the engine will know its labored but not why.

Posted on Mar 08, 2011

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cansmo
  • 2431 Answers

SOURCE: 1995 Ford Windstar Engine Knocking

No if the oil light has flickered you have oil pressure loss some time just belive the sensor do help us out. lifter do not cause oil pressure loss pressure is built in the rotation of the crankshaft. The knock under the plenum will point you to that cylinder that is affected, (main bearing) as for a 1995 the injectors can only cause a misfire but no knocking noise,will they honor the warranty

Posted on Apr 21, 2011

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