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What are the symptoms of a sticking valve on my engine

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Backfiring, skipping, tapping noise

Posted on Apr 30, 2015


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How to get sticky valves loosen up on a 235 chevy motor without a taredown on motor

An engine in regular use shouldn't have sticky valves and if it does, it is probably ready for a top overhaul.

In the case of an engine fitted with hydraulic valve lifters a combination of high oil pressure and/or weak valve springs can cause a condition called tappet jacking. This gives the symptom of sticking valve(s).

An engine that has been badly stored could suffer sticking valves. If it runs then the original cure is upper cylinder lubricant added to the fuel and poured down the intake of the running engine but this should not be used with engines fitted with a CAT or oxygen sensors.
If the engine is a non-runner there are a number of struggling methods that vary depending on engine type. Once the engine runs the valves should soon begin working normally.

Jun 04, 2017 | Cars & Trucks

1 Answer

Code P1559?

P1559 - Throttle Body (J338): Fault in Basic Settings Possible Symptoms
  • Not known
Possible Causes
  • Idle Switch Open or Open Circuit
  • Throttle Valve sticks and won't close
  • Speed Impuls from Engine Speed Sensor (G28) recognized
Possible Solutions
  • Perform Throttle Body Adaptation

Mar 10, 2016 | 1996 Audi A4

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What is code , po299' on mitsubish shogun 2008

the following answer is courtsey of OBD Codes Your OBD-II Trouble Codes Repair Site Home Trouble Codes FAQs Forums Store P0299 Turbo / Supercharger Underboost OBD-II Trouble Code Technical Description Turbocharger/Supercharger "A" Underboost Condition What does that mean? The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost. That could be due to a variety of reasons, which we detail below. On a normally operating turbocharged or supercharged engine the air going into the engine is pressurized and that's part of what makes so much power for an engine of it's size. If this code is set, you will likely notice reduced power output. In the case of Ford vehicles, this may apply: "The PCM checks for a minimum throttle intake pressure (TIP) PID reading during engine operation, which indicates an underboost condition. This DTC sets when the PCM detects that the actual throttle intake pressure is less than the desired throttle intake pressure by 4 psi or more for 5 seconds." Symptoms Symptoms of a P0299 DTC may include: MIL (Malfunction indicator lamp) illumination Reduced power output from engine, possibly in a limp mode Unusual sounds from the engine/turbo There would likely be no other symptoms. Potential Causes Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Faulty wastegate bypass regulator valve (VW) Low fuel pressure condition (Isuzu) Sticking turbo nozzle control solenoid (Isuzu) Faulty injector control pressure (ICP) sensor (Ford) Low oil pressure (Ford) EGR system fault (Ford) Variable geometry turbocharger (VGT) actuator (Ford) VGT vanes sticking (Ford) Possible Solutions First off, you'll want to repair any other DTC codes if present prior to diagnosing this code. Start with a visual inspection. Inspect the intake air system for cracks, loose or disconnected hoses, restrictions, blockages, etc. Repair or replace as required. If the air induction system tests OK, then you'll want to focus your diagnosis efforts on the charge pressure control, diverter valve (blowoff valve), sensors, regulators, etc. Really at this point you'll want to refer to a vehicle specific detailed repair manual for specific troubleshooting steps. There are some known issues on certain makes and engines so also check out our car repair forums here and search using your keywords. For example, if you search around, you'll find that a common fix for a P0299 in VWs is to replace or repair the diverter valve or wastegate solenoid. On the GM Duramax diesel, this code may mean the turbo housing resonator has failed. If you have a Ford, you'll want to next check the wastegate regulating valve solenoid for correct operation

Read more at:
OBD II Trouble Codes Home

Aug 02, 2015 | Cars & Trucks

2 Answers

My truck is a 1994 v6 nissan vg30e series overhead cam if its a valve burnt wouldn't it get worse very quickly? Or can it be a injector problem

try posting the symptoms. hot and cold engine.
idleing, racing idle, driving, flat or hills.
misfiring, flooding, stalling,, bogging, low engine power all the time.
there are many symptoms not just those, even noise.

if compression is good, the valves are ok.
and if serviced right. ever do a 60,000 mile tune up>?

Jun 06, 2014 | Cars & Trucks

2 Answers

The transmission will not engage. the fluid and filter have been replaced, and the system was flushed. it worked for a couple of days, then it started again.

It sounds like your valve body may be sticking. If it is, this is usually caused by debris getting into the valve body and causing the pistons to stick in their bores. This can cause an internal hydraulic leak and the symptoms you are describing. Unfortunately, this usually results in a transmission overhaul because the debris that makes the valve body stick usually originates from clutches and other parts that are damaged or badly worn.

Apr 15, 2011 | 2001 Oldsmobile Aurora

2 Answers

Chevy 2002 Malibu ERG valve

Symptoms of a bad EGR valve are usually stumbling idle or the engine stalling when the car is warm (normal operating temperature). Find the EGR valve and locate the vacuum line attached to it. Start the engine cold and wait for it to warm up. When the engine starts to stumble, pull off the vacuum line. If the EGR is bad, the engine idle will stabilize and no longer stumble.

May 25, 2010 | 2002 Chevrolet Malibu

1 Answer

Miss not engine related in 1993 buick regal, 3.1 v6

Possibly Igniton Check the sparkpug wires for excessive resistance with an Ohmmeter at each end, spec is no more than 1000 ohms per inch of wire, as well as checking the connections... the coils from tower to tower on each coil should measure between 5000 to 7000 Ohms resistance, any more than 7000 the coil is scrap..if a coil is bad it will knock out 2 cyls and it will be a 4 cyl engine instead of 6...LOL

If this miss is at Idle only try tapping on the EGR valve sometimes they stick or have a piece of carbon holding the valve open causing miss like symptoms .... Hope this helps good luck

Dec 06, 2009 | 1993 Buick Regal

1 Answer

Oil Pressure Suddenly Reading in High and Low Ranges

either the oil pressure sender is defective or the pressure relief ball valve in the oil pump is sticking, my money would be on the oil pump pressure relief valve ball sticking.

May 27, 2009 | 1998 Dodge Intrepid

2 Answers

Cyl 8 filling with gas and hydrolocking engine

check to see if the injector signal wire is shorted to ground, to check this disconnect the ECM, pull the connector off the injector, the red lead is 12 volts, the other wire is the signal wire, probe the connector with one end of a Ohm meter and touch the other to ground, there should be no more than 3 ohms showing.

May 15, 2009 | 1988 Ford F 150

2 Answers

Malfuntion light coming on...egr valve may need replaced

the range from a simple sensor issue with no symptom except a check eng light to a rough idle with a light.

Mar 20, 2009 | 2005 Dodge Grand Caravan

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