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20L Diesel loud clacking noise only at 1200 - 1500 revs only when warm and under load. slightly smokes when doing it

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  • Suzuki Master
  • 20,706 Answers

Noise is.
1: Diesel KNOCK (detonation,)
2: or doom. (rod, or main bearings or piston cracks?)
what does the scan tools show>?
what year car? what country.

Posted on Sep 15, 2013

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6ya6ya
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Posted on Jan 02, 2017

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  • 110 Answers

SOURCE: 1.5 diesel. Blue smoke, not

Not sure what you mean by "heavy on diesel".   Most diesels, except for late models say 2005 or newer, will have a tiny amount of smoke when cold.  It's hard for a cold motor to combust diesel without a little smoke.  
My money would be on one or both of the other two injectors, dirty, dripping or bad spray pattern.  If you near anything lke a small city, you may be able to find a shop that has the abilty to clean and check them. I use a big marine diesel shop, RPM, in Ft Lauderdale, they can generally get injectors back to new for cheap (maybe $30 each) and have a big expensive high tech machine to test them (they can afford to, they use them for engines on million dollar yachts, among others).  The hyundai injectors might be cheap, the Bosch ones are not.
Injector cleaner in a can that the parts store is happy to sell you, has not worked for anyone I know.   
If you ever lay the car up (e.g. go away on holiday for a month so) put additive in the diesel to keep bacteria from growing in it.  If you can't get it in the auto store, try a marine store.

Posted on Oct 30, 2008

Robert R
  • 7 Answers

SOURCE: 2004 Ford F-350 6.0 Turbo Diesel - Severe Hesitation at Take Off

Some of these engines have a place to drain water out of the fuel system.. Some fords actually have a stick under the hood that you push or pull That opens a valve on a water collection bowl. It's not labeled usually. It might state where it is in the owners manual under fuel water drainage or something similar.. if that bowl is full it will cause hesitation... If it gets over full it will cause runability problems. Another possibility since you said it's black smoke is one of your injectors is sticking at low rpms and squirting raw fuel into the cylinder till the rpms get up enough to burn that fuel off completely then then the injector works a little better.... Do you notice any missing... Feel something under the hood like the air cleaner housing and make sure the vibration is constant and doesn't have a small sudden shake and the n smoothe... And then a small sudden shake again.
If it does have this shake you can trouble shoot which injectors by with the engine running loosening an injector line and seeing if the engine runs worse or not.. If it runs worse tighten it up and move to the next line till you unscrew one and feel and hear no difference... When you find that one that's the injector with the problem.

Posted on Apr 22, 2009

  • 5 Answers

SOURCE: Ford F-350 6.0 Turbo Diesel - Severe Hesitation at Take Off

sometimes when the motors under enought pressure it will black smoke..so mabe the transmission is hanging up or something in first gear,,,i can rev my truck up all day and it wont black smoke when these a sever load o it and i hammer down it putts a bind on the motor and fuel is steadly being pump into the motor causing unburn fuel witch is black smoke..so maybe you want to go check the transmission or the fuel PUMP not the filters

Posted on May 17, 2009

  • 1 Answer

SOURCE: I just bought a 2008 Sienna w/ 44,000 miles. When

I have a 2008 Sienna with 34000 miles. I have had the same noise since it was new. I finally talked to the dealer today and was told it is the fuel injectors and that it is normal.

Posted on Feb 02, 2010

  • 180 Answers

SOURCE: F250 Diesel engine won't start in cold weather

check your glow plug relay! located on the right side head

Posted on Mar 19, 2010

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