Question about 2002 GMC Sierra

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Fuel don't ignite in cylinder nr 3

My car's cylinder nr 3 don't burn the petrol. All the checks was done, like timing was checked, there is no burnt valves and no bent valves. The fuel injectors was replaced and the computer was connected and there is no error messages as everything was ok/successful. The sparkplugs was changed and also the sparkplug wires. There is enough spark at all four sparkplugs and the compression test was also done. Everything is ok. What else can be the cause for one cylinder not to burn the fuel?
Thanks Hugo

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  • paulwillywil May 11, 2010

    are you sure there is fuel to number 3?

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I HAD THE SAME PROBLEM WITH ONE OF MY CARS BROKE ROCKER ARM OR BENT PUSH ROD.

Posted on Mar 11, 2009

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What vechile is it ,is it sparking on no 3,maite be low compression

Posted on Feb 23, 2009

  • myearwood0 Feb 23, 2009

    is the injector switching

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2 Answers

Not starting. Getting fuel/spark, and compression is good in all cylinders.


I don't think there is any sensor, you might need to check all the plug wires one of the wires might have come loose if they all are good then check to make sure that your getting fuel to the motor even if your fuel pump is working you might have a blockage in the fuel line, double check the timing to make sure that its right because if its off just a hair it will cause the car not to start. once you have done that if it still wont start hit me up and we will go from there ill check to see what else we should do to get your car up and going!!!!!

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Why is there emisions of unburned gas coming from my Kia Sedona 2003?


you will have to check the ignition system, plugs, wires, fuel injector not working properly, leaking or on time is too long allowing too much fuel into the cylinder, computer sees the temperature as colder than it really is allowing more fuel to be injected into the cylinder, dirty valves. you don`t say if the reading is HC or CO as HC is raw fuel not burnt and CO is incomplete combustion like a miss fire or not burning all the fuel in the cylinder.

Aug 28, 2014 | 2003 Kia Sedona

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Incorrect valve clearances


Raw petrol means no combustion in the cylinders or fuel is flooded. Check the spark plugs and ignition spark first. Noise in the cylinder head could mean engine knocking due to oversupply of fuel or unburnt fuel causing higher pressure in cylinder.

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Catalytic converter gets red hot


No flashing check engine light? I would say that unburnt fuel is being burnt inside the converter, melting its interior down.
The rough running could come from a misfire from one or more cylinders. The fuel which is not burnt in the engine, will burn off in the converter. Don t continue driving, it will ruin the converter.

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P305 code we have changed the spark plugs and wires we have replaced the fuel filter and had diagnostics done on the car and the mechanic says there is nothing wrong with the cyclinders


This is what all should be checked:
P0305 indicates the PCM has detected misfires on cylinder number five.
Here are six common problems that may cause OBD trouble code P0305:
  1. Fouled, cracked, worn or otherwise misfiring spark plug (Replaced)
  2. Bad ignition wire - burnt, cracked, carbon tracked wire or plug boot (Replaced)
  3. Defective ignition components - ignition module, ignition coil, distributor cap, etc..
  4. Vacuum leaks
  5. Clogged or otherwise defective fuel injector
  6. Internal mechanical engine fault, ie., low cylinder compression, bad valve, collapsed lifter, etc..
The aforementioned list covers the most common causes of P0305 in the order we feel is most likely to occur based on our past experiences. Certainly, each situation is different and there are other possible causes for cylinder misfires. Here are other causes we've seen (in no particular order).
  • Low fuel pressure
  • Leaking fuel pressure regulator
  • Poor fuel quality - water in gas tank
  • Uneven EGR flow caused by carbon build-up on engine with multiple EGR ports
  • loose or corroded fuel injector wiring
There seems to be a few things that have yet to be checked by your mechanic.
I know it is frustrating when the OBDII codes don't point you directly to the problem. To be hones this is something that I can not solve from here. However I hope that with the above information you can get your misfire detected code to go away after the real problem is discovered.

Kelly

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Hi guys! Own a golf 1.4 carb! 2004, I'm having problems with idel! Heavy on fuel and my compression is low now, I've changed my base plate, set the co,z on my car but still can't seem to get it...


Does exhaust smell like petrol - low on power? If so it's running on 3 or 2 legs, meaning ignition in one of the cylinders is not burning fuel. This causes irregular idle and high fuel consumption.

Low compression might indicate a leaking head gasket, worn cylinder rings. Remove the oil dipstick and check if there's pressure coming from the sump. This indicates worn cylinder rings - loss of compression.

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1 Answer

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Is it Diesel (turbo/non-turbo) or petrol? If its petrol then get the ignition system checked, for diesel it looks like problem with fuel pump.

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3 Answers

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When the compression is good or within specs. You don't have a burnt valve. A bad valve will cause low to no compression at all. The misfire could have been from the spark plug, fuel injector, or coil. You said the check engine light was on. do you remember the code/s?

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1 Answer

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