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Toyota 3rzfe On start up sounds like a big knock,but after running for a few minutes it goes away. Motor at low revs has a slight mis. A mechanic says this could be carbon build up in the intake manifold, oil pressure is fine and colour is still golden. Any idea's?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: low oil pressure on 99 jeep grand cherokee

change your oil,it could be too thin,see if that fixes it

Posted on Jan 17, 2009

bunnydawg
  • 5158 Answers

SOURCE: Oil pressure dropping to 0 after running for a few minutes

Locate your oil pressure sending sensor... generally near the oil filter intake but not always... give it a spray of WD40 to repel any water on it. next have the oil pressure tested just to be certain. the relay for the sending unit may need to be replaced as well... it's located likely in the fuse box in the engine compartment near the battery.

Robert

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Posted on Feb 01, 2009

  • 6982 Answers

SOURCE: after starting vehicle, oil pressure will start to drop after running for about a minute and motor will start knocking

When you first start your engine the oil is cold and somewhat thicker, therefore oil pressure is a bit higher. If your bearings are worn, as the oil gets warmer and thins out, they will begin to knock. If you don't drive it and have caught the condition early, sometimes you can just replace the rod bearings, and it will be OK. However, after removing the oil pan and inspecting the damage, if you find that the main bearings are also worn, the engine will need to be removed and all bearings must be changed.(use "plastigage" to determine bearing wear) I strongly recommend that you change the oil pump as well, to ensure that new parts get a good oil supply. NOTE: some people attempt to just replace the oil pump when this condition exists...It is a total waste of time, and will not work. I know that this is not what you wanted to hear, but its a fact!

Posted on Apr 15, 2009

  • 1 Answer

SOURCE: 1996 Toyota Tacoma wont start when the engine is hot and sits a few minutes

I Hope You All Appreciate This FAST and EASY Inexpensive Repair That Even The Toyota Dealers Dont Seem To Know How To Fix !!! The Problem Is The Air filter temp sensor. Look On The Left Side Of the Air Filter Housing and Disconnect The Plug Thats Attached To The Spark Plug Like Plastic Sensor Mounted on The Side Of the Air Filter Housing, Now Go Start Your Truck !!! Your Truck Will Start And RUN Fine Now ! Replace The Sensor Approx $59 at Autozone... This Should Fix 90% Of Your Problems If your In the other 10% and it does not Fix it , Email Me and Ill See If I Can Help ! People Have Spent Hundreds and into The Thousand Dollar Area Trying to Resolve This Intermittant Problem At Inept Shops with Illiterate Mechanics ! If Your Happy With This Fix, BE Generouse ! I Do Accept Donations at Paypal Send to donsgirl89@yahoo.com Thank You JOE Mechaniac

Posted on May 18, 2009

gabndan2
  • 35 Answers

SOURCE: No oil Pressure, with knock. then oil pressure returns after turning off engine for a few minutes and cranking back up again.

is oil filter clogged???

Posted on Jun 01, 2009

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The oil pressure is low at idle and rises with higher engine revs. Oil levels are ok, new oil approx 2000kms ago. Was a slight noise at one stage in the engine but went away after engine's revs in


It sounds as if the clearance that the bearings normally run in have been surpassed and need to be replaced. Higher engine revs will supply extra oil which will overcome any small discrepencies but constant running at this stage will result in faster degradation of all engine components concerned resulting in a more expensive repair. Shes basically worn out.

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I had a chevy 2002 avalanche,2004 chevy tahoe both after 20,000 miles developed a mild lifter or slight bearing knock.When I confronted chevy with this problem they stated this was normal for the 5.3 liter v8.Being a mechanic myself didnt think this sounded right.My friend has a 2003 gmc yukon and motor sounded same way.I no longer own my chevy,But my friend still has yukon with 150,000 plus miles and yet it still knocks when you start it.this is just a problem with chevys and other gm products.

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If the sound does not go away then the engine has internal problems. Some times if someone over revs the engine it will cause knocks.If the oil is not changed regularly and the engine gets hot due to low water,racing engine then engines dont last long.
If its a deep solid knock its a crank shaft bearing.
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Knock in engine


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1 Answer

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