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Idles rough ,spark plugs burnt one side,valve hit piston

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If the piston truely hits the valve then your car definitely need overhauling! rod bearing could have worn out. get it towed to a repair center.

Posted on Nov 04, 2008

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Posted on Jan 02, 2017

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I changed the cylinder head gasket and lapped the valves torqued the head bolts to spec and still have the same problem low compression in # 4 cylinder on a 1986 Chevy chevette gas engine thanks


Did u machine the head?, replace the valve seals?, oil & coolant mixing? Spark plugs burning oil or burning coolant? Oil smell burnt? Possible rings,

Aug 16, 2017 | Cars & Trucks

1 Answer

Why is there a miss in cyl. 1 that only occurs at idle speed, which seems low (750 rpm)?


Bad head gasket, burnt/stuck valve, or bad piston rings. Do a compression test. None are worth fixing in a high mileage car. It only creates other problem.

Apr 05, 2016 | 1999 Plymouth Breeze

2 Answers

V6 engine problem. Went to replace spark plugs... upon removal one side of engine spark plugs were in great shape, other side engine spark plugs were trashed.. what is problem?


oil leak in valve cover got gasget in side valve cover and if plug wires wear not on like thay got to be that well do it dont seal

Feb 19, 2015 | 2004 Hyundai Tiburon GT V6

1 Answer

My 99 camry 4cyl, has a rough idle and sounds like a misfiring when accelerating when in gear. Any answers to what it could be?


You could sure be running on 3 pistons. Check spark plugs by removing one HT lead at a time with engine idling. One that's dead will not alter your idle speed when disconected. Replace bad plug and check the same cylinder again. If OK fine. If not check whether you are getting a spark to that plug and rectify. If you have both power and a good spark but still without power the check engine - valves and pistons.

Sep 25, 2012 | Cars & Trucks

1 Answer

VERY ROUGH IDLE NO EXCELERATION


Try a few if these ideas...

Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration

Apr 18, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

Rough idling and alot of black smoke.i have 4 white spark plugs and 4 black ones. could it be an oxy.sensor?


the ones that are white.. means your burning coolant so that side of the engine has a leaking head gasket.. as for the 4 black ones.. that most likely means your burning oil, and the black smoke indicates burning oil as well.. that could be bad piston rings, valve seals, bad pcv valve... it could be all those things....

Mar 04, 2011 | 2004 Chevrolet Silverado

1 Answer

Rough idle,blow by ; blows oil cap into my hand when i unscrew it no water in the oil,checked injectors they seem good could it be head gasket?


Do a compression test to the cylinders, you could have a burnt valve or bad piston ring. Keep me posted, if you can not get a compression test gauge you can always do the oil school method and pull the spark plugs and read the spark plugs condition's. Good luck and be glad to help.

Jun 11, 2009 | 2004 Dodge Ram 2500

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