Question about 2002 Hyundai Santa Fe

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Low power and acceleration

Recent engine job (new pistons, rings, valves etc). Engine runs smooth but lacks power. Difficult to achieve speeds over 120Km/h.

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Possibly timing belt is off a tooth or more , possibly fuel filter

Posted on Nov 06, 2012

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Engine oil coming up thru #4 spark plug hole


you have a bad head gasket or a crack in the block or a bad valve seal

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Installed new piston rings and gas is getting inside oil


valve not closing is from a bent valve. Black soot is from over fuelling and incomplete combustion. Oily chamber is oil from the rings. It si possible that more than one valve is bent as it occurs from turning the engine over without letting of the rockers when adjusting the valve timing.

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hi def sounds like a lack of compression problem, i would say if you opened the motor up and done the rings it will be a good start

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I have a 1991 Dodge Dakota that is running very poorly. There is an abundance of blue smoke that emits while accelerating. The truck has a V8 engine but lacks the punch, has a lot of trouble accelerating...


Blue smoke is a direct indication your burning oil.This is a old truck and im assuming it has lots of milage.If this true either your valve seals are bad or piston rings are bad.Both of these cause oil burning,which will cause blue smoke and poor performance.

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Blue smokes come out tailpipe when i start the car but stops afte


Helllo there
Symptom: Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it. Possible causes:

  1. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  2. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)
  3. Damaged or worn valve guides.
    The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:

  1. The PCV system is not working properly.
    The Fix: Replace PCV valve.
  2. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  3. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  4. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)

Jun 01, 2010 | 1989 Buick Electra

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Oil in with spark plugs


Your piston rings are bad.

Jun 25, 2009 | 1995 Chrysler Cirrus

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I have a 2001 Dodge Ram 1500 5.2L, 197000km/120000miles. The cat was plugged up with no engine power. It occasionally smoked upon ignition. It occasionally smoked out an oily soot from the exhaust. The cat...


The plenum problem should not affect compression tests. It allows oil to get sucked into the intake and will cause carbon buildup, plug fouling, and pinging. If you have zero compression on a cylinder, it is usually a valve problem. Even a burned piston will make some compression, unless it has a big hole in the middle.
Sorry, but if your compression results are to be trusted (and it seems they are), then you have to tear a head off to find the problem, or at least get a borescope in it.

May 18, 2009 | 1999 Dodge Ram

1 Answer

Engine knocking


Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

Dec 26, 2008 | 1990 Cadillac Fleetwood

1 Answer

Cylinder 4 misfire: lacks compression


the things that would cause lack of compression are:
  • bad headgasket
  • damaged piston rings
  • valves not sealing- could be exessive carbon build up, bad valve spring, bent valve

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