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Will engine code po128 cause engine to knock for a few minutes then goes away ?

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Code p0128 refers to coolant thermostat-coolant temp below thermostat regulating temperature ====causes mechanical fault
that probably means that the thermostat is stuck open
As to your question "will it cause a knock?" it is possible because the operating temperature of the engine is below what is required for proper combustion and the knock may be the excessive piston clearance until the piston heats up and expands to take up that clearance . I suggest that the thermostat be check out first and replaced if necessary and see if that stops the noise

Posted on May 13, 2014

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Posted on Jan 02, 2017

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SOURCE: 2004 V6 cold engine noise related to steering - goes away after few miles

check pawer steering pump belt mybe it is worn out or loose, also check the alteranator belt.

Posted on Oct 18, 2008

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SOURCE: Knocking until car warms up

Sounds like a lifter noise. worn lifters can't keep oil in them anymore so over night the oil leaks out. when you start the vehicle, you will hear a ticking noise or knocking noise till the lifters fill with oil again. only remedy is to replace the lifters.
you could try an additive but it's temporary.

Posted on Dec 24, 2008

james klgr
  • 362 Answers

SOURCE: experiencing a

it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise

Posted on Oct 26, 2009

  • 105 Answers

SOURCE: White milky substance slight engine knock

lack of service probably the cause try thicker oil or stp engine wear oil has it been stood for a while? if so recomend new oil and filter make sre you flush old oil out with cheap oil then proceed with oil change you can use oil flush too the oil should be golden once started after a week check oil again for signs of emulsification on the cap

Posted on Dec 15, 2009

  • 538 Answers

SOURCE: vortec 350 knock on start-up.

Is it a ping or a knock? It could be the initial timing is not set correctly. Are you losing coolant? It could be a leaking head gasket and is leaking a small amount of anti-freeze into one of the cylinders. If it is a bearing it will get worse and worse, is the oil pressure good? I guess I'd take it back to the rebuilder.

Posted on Mar 27, 2010

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Can the p00121 cause a tap or knock


P0121 is a TPS circuit code. It won't cause a noise at all

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Pontiac grand am I had a diagnostic reading at autozone for diagnostic codes po128,po440 and p1189 don't know what they mean for a 2003 Pontiac grand am gt 3.4 liter and v6 engine vehical


PO128 -- engine coolant low or thermostat not working
P0440 - EVAP system malfunction, gas cap loose - Cat convertors missing from car can cause this
P1189 - Engine Oil Pressure Switch Circuit -- CAT CONVERTORS MISSING FROM CAR can cause this.

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2004 buick rainer, po128 pending has heat the check engine light comes on and goes out temp is 195


PO 128 is a coolant temperature beyond threshold code. It means your thermostat is stuck and needs to be replaced.

Dec 29, 2014 | Buick Cars & Trucks

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My 2003 x5 bmw 4.6is, makes a knocking noise in the Engine upon stating it up, but usually goes away after a few seconds.


Sounds like excess bearing clearance, when the engine sits overnight the oil between the bearings and the crankshaft is able to run back into the oil pan. When you first start it up it takes a few seconds for the oil pump to fill the spaces back up and you get some clatter.

Jul 26, 2014 | 2003 BMW 5 Series

1 Answer

Will engine code po128 sometimes cause the engine to knock for a few minutes then goes away ?


No, P0128 code is the pcm determining that the engine is taking too long to warm up. Usually caused by a defective thermostat. If the engine is knocking upon first start up, then it may be a "dry start" type of situation. When was the last time the oil has been changed and was it quality oil and filter? Without knowing what type (year, make,model) that the car is , I can't help much more than that.

May 13, 2014 | Cars & Trucks

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Car won't start/shows code po128


replace sensor, top coolant, dis-connect battery for 5 minutes, re-connect and start

Apr 08, 2014 | 2003 Oldsmobile Alero

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A knocking that starts when engine is cranked then it goes away


The knock is likely a worn connecting rod bearing. Are you using the correct weight of oil, never use any heavier than 10W30W, heavy oil viscosity's cause slow circulation through the oil passages and starve the engine's bearings for oil.

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I have a 95 oldsmobile 98 regency elite I cant find where the knock sensor goes I have a haynes manual but where it shows it wont go


Well, for starters, your problem got posted under 1985 Oldsmobile 98 - then you said it was a 95 Oldsmobile 98 Regency Elite (HUGE difference between 85 and 95)...then it would be REALLY nice to know which engine we are talking about.

I'll just go with what you said last: 1995 Oldsmobile Regency Elite (Two engine possibilities)

If you have the 3.8L Supercharged engine (VIN CODE "1") it is on the left side of the engine near the oil filter.

If you have the non-supercharged 3.8L (VIN CODE "K") there are TWO of them. One is near the oil filter and the other one is in about the same location on the other side of the engine block.

Please also note that MOST fault codes for knock sensors are not caused by the knock sensors themselves. (they do fail, but it is very rare.) Usually there is either a wiring problem to the knock sensor, or the engine has internal problems causing a "knocking" or "ticking" noise which causes the engine computer to "think" that there is a problem with pre-detonation causing an "ignition ping". The code sets when the computer has retarded the ignition timing as far as it can and the "knock" or "ping" does not go away....usually it doesn't go away because it is not caused by ignition timing. The knock sensor is just doing its job and reporting the knock. It does not know the difference between a knock caused by ignition and a knock caused by internal engine problems.

Jun 28, 2011 | 1985 Oldsmobile 98

2 Answers

White milky substance slight engine knock


lack of service probably the cause try thicker oil or stp engine wear oil has it been stood for a while? if so recomend new oil and filter make sre you flush old oil out with cheap oil then proceed with oil change you can use oil flush too the oil should be golden once started after a week check oil again for signs of emulsification on the cap

Dec 15, 2009 | 1998 Ford F150 Regular Cab

1 Answer

Experiencing a "ticking" "knocking" type noise when 1st starting the car in colder weather that goes away once the blazer warms up , any help ?? I was told it could be the exhaust manifold , or piston...


it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise

Oct 26, 2009 | 2002 Chevrolet Blazer

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