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Tappits knock when accelerating - 2006 Pontiac Torrent

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Use thin Wynn thin oil additive into crankcase engine oil right away.
Use 5W/30 synthetic engine oil . Change oil filter also .

Posted on Jan 22, 2013


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I have a rattle in my holden 6.0lt L76 v8 at low load im wondering if my tappits need retentioning or my timming chain needs replacing how do I work out which is the problem

The tappets will be hydraulic so there is no adjustment there . The chain will not make a tappet noise but will be a rattle that gets worse with the rpm's( High klm's motor) . I suspect that what you may be hearing is detonation which occurs at low speeds under acceleration or at any speeds under sudden acceleration. IT is caused by spontaneous combustion in the cylinders ( not spark timing related) and is from normally a wrong air/fuel mixture form a wrong setting from the ECM . IT can be from faulty O2 sensors, injectors . fuel pressure , air filter MAF/MAP sensors Have the fault codes read first to check for any sensor problems Sometimes all it takes is to upgrade the octane rating of the fuel use (no E fuels)

Jul 19, 2014 | Cars & Trucks

1 Answer

Engine rattles when i start it and sometimes rattles the whole time its running

this sounds like tappits/ hydraulic tappits but not knowing wether it is top or bottom of the engine it is hard to diagnose

Dec 30, 2013 | 2004 Dodge Ram 1500

1 Answer

Press the acceleration/gas pedal and hear a ruggling noise (roll your tongue when you make it - and imagine it being 10x as LOUD) equal to each press. Once the car is moving fairly fast (>50 the...

hi ummm...ruggling, thats a new one for me lol, but this sounds like either, the big ends ( these are the things that hold the piston rods to the cranck google it you will see ) have warn or the shell bearings have, and this will cause more of a knocking sound a low rumble as such, or if it is a high pitch type rattle noise this could be the tappits are not getting enough oil to them, but this sounds more like the first bit...hope this helps

Dec 02, 2010 | 1988 Toyota Camry

3 Answers

Knocking in the engine

piston noise most likely

Jul 23, 2009 | 1996 Toyota Tercel

2 Answers

99 cadillac escalade knocks when accelerating

Chk. universal joints. Sounds like you got a bad one

Feb 16, 2009 | 1999 Cadillac Escalade

1 Answer

Engine idol knocking noise stalls while holding on footbrake

Hi portop,
Have the valve clearances checked, it could be tappits noise.....Has the vehicle ever been over heated? How's the power output from the engine, has it changed since you've had the vehicle? Does the sound disappear completely, or is the knocking sped up so it's faster and becomes hidden?

I think that it will be a good idea for you to have a technician listen to the engine, to make sure that you don't have a serious problem. Get two or three opinions

best regards Johngee10

Jul 12, 2008 | 1995 Toyota Previa

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