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

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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.

Posted on Jun 14, 2014

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ZJLimited
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SOURCE: po455 trouble code, seems

P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.

Causes: A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Test, check it and keep us updated.

Posted on May 25, 2011

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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

Jul 30, 2016 | Cars & Trucks

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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.

Jan 28, 2015 | 2003 Pontiac Grand Am

1 Answer

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


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

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

1 Answer

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.

May 17, 2012 | 2002 Dodge Durango

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1993 mercury villager check engine on with code 32 and 34. repair manual says the code 32 doesn't bring the check engine light on but the 34 does. code 34 says problem with the egr valve solenoid or...


After awhile these idle screws don't have a lot of effect, the throttle body & injectors are also probably dirty. The 1.5 turns out from a soft seat is a starting point. Go another 1 to 1.5 turns out to find the sweet spot. Pour a can of Seafoam in with about 1/2 tank of gasoline. That will help clean the injectors & combustion chambers. Clean the throttle body with throttle body cleaner, make sure there is no carbon around the edges of the butterfly and where it seats.
The knocking on starts is most likely from worn bearings. It will knock until oil pressure builds up & is circulating through the journals. I hope this helps.

Sep 24, 2011 | 1993 Mercury Villager

2 Answers

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

1 Answer

Idles rough when first starting in morning. plugs replaced, new throttle body, two new ignition coils. After a few minutes rough idle goes away. Sometimes causes check engine light to go on. Not consistent...


Sounds like you might have a bad engine coolant temperature sensor. I would have the codes retrieved from the computer to see what sensor/s it is seeing a problem with.

May 20, 2010 | 2000 Mercury Sable

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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

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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

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