Question about 1999 GMC Yukon

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Detected misfire #6

Suv feels little shake when being driving. I put new spark plug, spark cords (rechecked cords for correct # orders, Complete system clean three time when fill up gas. Still been misfired detected for a week and half. Computer shows same detected #6.

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I would check to make sure you are getting spark to the plug itself. I would connect that cylinder wire to spark tester and check for spark. You may have a bad fuel injector for that cylinder.

Posted on May 13, 2010

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1 Answer

Shaking spark plugs


recheck firing order and wire attachment . sounds like you broke a high tension lead when you pulled the boots off the plugs

Feb 26, 2014 | Kia Sportage Cars & Trucks

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Missing,viborating


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2009 Ford F-150

1 Answer

Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2004 Ford F150

1 Answer

MY FRIENDS CAR IS SHAKING REALLY BAD AND THE ENGINE LIGHT IS ON. SHE TOOK IT TO AUTO ZONE AND THEY SAID ITS A CYLINDER 1 MISFIRE. SHE ALREADY HAD HER FRIEND CHANGE HER SPARK PLUG WIRES AND IT HELPED FOR A...


it most likely is the coil, but recheck the spark plugs and spark plug wires just in case one of the new wires are touching a hot exhaust manifold..

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I took my 2004 gmc envoy, 6 cylinder, in for new spark plugs and fuel filter. When i got it back the service engine light came on. I took it back and was told that it was a bad spark plug. I have taken...


I was having a similar problem with my 2002 Envoy. Usually when accelerating at 60 and 90km/h it would have almost like a clunk and idled rough.

I took it into the shop and they said a tune up would be the first step to correct the misfire (25 options to choose from!) After pulling the spark plugs the 5th and 6th didn't look right. As a result my mechanic ran a compression test.

The 6th cylinder is only putting out 80lbs of pressure where as the rest were putting out 195lbs (factory says it should be around 215lbs). His recomendation was new motor or new vehicle.

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2003 mercedes Benz C240 codes P0300, P0301, P0302 and P0303. Please, help me how to fix?.


P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
according to this fault codes first mark ignition coils
3 ---------------- 6
2 ---------------- 5
1 ---------------- 4
RB-------------LB
this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
P 0304 Cylinder 4 Misfire Detected
P 0305 Cylinder 5 Misfire Detected
P 0306 Cylinder 6 Misfire Detected
You can Identify it's a faulty ignition system then next swap ignition lids from ignition coils be careful each coils have two lids one short and other long bit deference and when you remove and fix it to the car keep in mind correct order because each coil two different fire for two spark plugs don't mix up, if you mix it can create the fault code.if you detect any fault ignition coils or spark plugs or lids replace that and also whether god or bad recommend to replace spark plugs, find the right that's most important thing, if this way couldn't found the any ignition fault next step is check fuel presser, when the engine running fuel presser must be around 4.5 bar without engine running must be 4 to 6 bar if the fuel presser too low need to check two different things one is fuel pump other is fuel injectors, in this case you can swap injectors from right bank to left bank and find is the injectors leaking, if not leaking faulty fuel pump.is this information helped you? if yes please leave a comment,

Oct 15, 2010 | 2007 Mercedes-Benz C230 Sedan

1 Answer

Just put new spark plugs in my 06 4.0 mustang. i gapped them correctly. but it still sounds as if it is misfiring. i looked at the order of the spark plug wires and it goes 1-2-3-4-6-5. should 5 and 6 be...


My information says 1-4-2-5-3-6. You can call your local dealer, ask for the service dept. they should tell you. But I think this is correct. Hope this helps.

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My 1999 crown victoria is misfiring at high speeds even after i changed all coils and put the right gapped spark plugs in i had it checked on a scanner and it said cylinder 5 was misfiring so they took the...


not only did the problem switch cylinders, it switched banks. cylinders 5&6 are on the drivers side and 4 is on the passenger side. i would recheck all wires to make sure you have the correctly installed.

cylinder locaton
2 8
dr. 8 7 6 5 7 4 coil

pass. 4 3 2 1 3 5
6 1 coil

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I replaced the spark plugs and wires on my 91 blazer now the thing shakes when i drive it what could it be


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