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Overfuel or low combustion on no 6 cylinder - Cars & Trucks

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Check all valve clearance on 6. not properly seating.

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

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I have a 2000 chevy astro van with misfire code in cylinder 6. I was told that i have to replace the spider, fuel injectors. Could it be something else?


If, in fact, #6 fuel injector is faulty, you need only replace THAT one injector. If once you've replaced said injector and another check still shows #6 is misfiring, same code, then you have a faulty exhaust valve and are losing compression. Best to do a compression test on all cylinders with all spark plugs out before changing that injector. It could be good yet and you'd have changed it for naught. Compression test first, it's simple. I'f test shows low compression on #6 then the valve is bad and you'll have to pull the head off and d a valve job to re-seat the valve. Once re-seated, turn the face of the head gasket surface up flat and pour some alcohol into the head combustion chamber. If it doesn't leak out, your done. Put it back together.

Jul 13, 2017 | Cars & Trucks

2 Answers

I have a misfiring problems with cylinders 1 and 6. Which ignition coil do i need to change?


Ignition coil one and six or course.The 3.7L uses separate ignition coils for each cylinder. The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. A separate electrical connector is used for each coil.
Because of coil design, spark plug cables (secondary cables) and a distributor are not used.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.
The ignition system consists of:
² 6 Spark Plugs
² 6 Separate Ignition Coils
² 2 Knock Sensors
² Powertrain Control Module (PCM

Dec 10, 2016 | Jeep Cars & Trucks

1 Answer

Same senerio as earlier, with the new tbi, all new sensors, truck sits ideling black smoke!! Fumes will burn your eyes sittn in cab!!


black smoke is incomplete fuel burn in the combustion process
the burning eyes is the resultant noxious oxides that form from that incomplete combustion
causes ==
possible turbo failure (if fitted) incorrect air/fuel ratio
faulty injector tips --not atomizing properly
blocked air filter
faulty injector pump--overfueling

Sep 05, 2015 | Cars & Trucks

1 Answer

What does OCD code P0306 mean


OCD , now that made my day..
ok 06 means misfire #6 cylinder
in truth it means, weak combustion on #6
caused by 3 things.
1: bad spark to #6 for any reasons.
2: bad compression (weak or none) on #6
3; bad fueling to #6 (injector issues #6 or air leaks there)

Mar 10, 2015 | 2003 Jeep Liberty

1 Answer

Sluggish no power cant get over 90kms


this is caused by loose compression.

either worn out piston rings or cracks in the combustion chamber.

replace your piston rings and cylinder head gasket. then bring your cylinder head to a machine shop to have it resanded.

if cracks are present in the combustion chamber, then one of the best solution is to have it rebored (to widen the current diameter of the combustion chamber) and replace your pistons with the correct diameter of the new hole.

Jan 31, 2013 | 2008 Jeep Patriot

1 Answer

Oil on top of pistons


Usually the result of excessive wear or broken engine parts. Oil is typically controlled by the combustion ring set....when the cylinder or rings are excessively worn or broken, oil can move past these directly into the combustion chamber. Other causes can be excessively worn valve guides and or seals.

Best way to test for wear or failure like this would be a cylinder leakdown or compression test. if one cylinder is excessively low, there is likely to be a broken part causing the problem....If they are all below stated expectations, then it's more likely just heavy wear.

Here is a good example of a compression test: http://www.youtube.com/watch?v=X_tbksFYhl4&feature=related

Sep 04, 2012 | 2002 Nissan Altima

1 Answer

I keep getting a cylinder-6 misfire. it says my map sensor has low input and it used to be the cylinder-1 misfire but after i put k&w block sealer and liquid glass it moved to the cylinder-6. i just...


if you put in engine sealer(coolant) then you have a coolant leak into the combustion chamber problem,which needs to be repaired properly.chances are it sealed the original problem and there is a another problem that is affecting #6.either way additives for this type of problem is only a temporary fix,this needs to be checked to find the original problem.you could have a fouled plug for that cylinder.

Apr 01, 2011 | 1998 Pontiac Firebird

1 Answer

1991 sl500 overfueling and not starting


1- Check if you see spark at spark plugs when start. If if is not then look for problem at ignition system.

2- Check the cold start valve, it is supposed to open only less than 8 sec during the start to assist the combustion. If it is faulty then it becomes always open causing too much gas in the cylinder chamber. Remember the golden ratio of Air: Gas is 14.6 to have a good combustion.
3-Check injectors. These injectors are normal close and only open when there is a signal from injection module control.

Sep 02, 2009 | 1991 Mercedes-Benz Mercedes Benz Sl Class

3 Answers

Gas in the oil on my 93 nissan altima GXE


yes you need to take off the chain, then very carefully remove camshaft. then take off oil pan and you should be able to get to the cylinder bottoms.

there could be a crack some were in the cylinder or pistons.

Jun 24, 2009 | 1993 Nissan Altima

1 Answer

Water getting in the oil supply


If you can see emulsification (white residue) inside the radiator cap, that means your cylinder head gasket is gone, your local gagrage should be able to determine this with either a compression test or a combustive test.
A compression test will show low compression on one cylinder and a combustive test will indicate exhaust gasses in the radiator, both indications of a blown head gasket.

Sep 13, 2008 | 1995 Nissan Maxima

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