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Old 04-09-2008, 11:43 AM   #1
Zero2_2005
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Misfire still when coil and plug is switched

I have this problem and it has been driving me nuts lately. I have a misfire in cylinder 4 and did the spark plug and coil+boot swap but it still misfires. I tried to do the swap again and this time with a Peake tool to reset the computer. The check engine light deosn't come on but the code is still stored within the ECU when read with the tool. The car does idle a little rough but when the rpm needle jumps and the car starts to get really rough idling, the check engine light comes on. This is really bothering me and would like to fix it
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Old 04-09-2008, 12:36 PM   #2
Ebob
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Check idle control valve, intake/exhaust camshaft sensors.
Mine was fixed after I replaced all 6 spark plugs .
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Old 04-09-2008, 02:54 PM   #3
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I had all that done about a year ago. New throttle body and both cam sensor replaced. I really don't know whats going on.
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Old 04-09-2008, 03:08 PM   #4
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If everything is checking out ok on the ignition side I wonder if it could be a clogged injector? Just a thought.
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Old 04-09-2008, 04:41 PM   #5
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could be a bad piston rings too.
do a compression check on the cyl.

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If everything is checking out ok on the ignition side I wonder if it could be a clogged injector? Just a thought.
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Old 04-09-2008, 10:41 PM   #6
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Thanks. I'm afraid I would need to take it to the shop unless somebody could give me some pointers on how sort out my kind of problem.
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Old 04-09-2008, 11:27 PM   #7
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run the car for few minutes and remove few plugs and do a comparison. Look at the end to see whether it's wet compare to other cylinders. do the compression check on that cyl. if it's ok, then use the fuel injector to add to fuel tank. I have heard many cases the injectors clogged, stuck open or stuck closed causing misfiring. These are simple steps you can do before take it to the stealership.
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Old 04-10-2008, 05:54 AM   #8
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If you have changed your coils around and you are still getting a misfire on the same cylinder my bet is you need a new fuel injector. Keep us posted

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Old 04-10-2008, 08:41 AM   #9
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if you think its the injectors , swap the injectors between cylinders and see if the missfire changes cylinders .
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Old 04-10-2008, 01:55 PM   #10
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Right now I am running some fuel system cleaner that will help clean the engine, the fuel injectors, the fuel system, and the valves and pistons. My car has been running on this stuff for about 3 days now and the engine check light just cleared up today. Hopefully it won't come back on but the thing is I would have to do a code check to see if the misfire is still stored within the ECU. I check back later on that.
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Old 04-10-2008, 05:34 PM   #11
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you can use injector cleaner, but do not over use it. additives in there could harm your fuel pump and other components.
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Old 04-20-2008, 11:28 PM   #12
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By the way, is there a DIY for swapping a feul injector cause I'd like to try that before going into the shop.
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Old 06-02-2008, 05:55 AM   #13
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i have the same problem right now.shop ran a scan on it and told me its the in line fuel filter and a faulty air mass sensor
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Old 04-26-2009, 02:11 PM   #14
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Hey guys!! Been long time. I think I may have figured out the problem. At first you guys said that it may be the fuel injectors but when I went to take out the spark plug in cylinder 4, I saw some moter oil on the plug and where the plug attaches. I was figuring out, " wait, what if it could be a valve cover gasket?" I just want to know if I am correct on this. Any input would be great. I don't know if the oil is really causing the misfire but I will see after inputs. I know it only costs at least $50 to fix with a DIY. Thanks ahead of time!!!!!
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Old 04-26-2009, 02:43 PM   #15
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valve ocver gaskets shouldnt effect the idle

when my x5 plugs were soaked in oil due to the gasket seal leak on the 4.4 with new plgs it was still idled great.
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Old 04-26-2009, 02:54 PM   #16
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definitely check the injectors
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Old 04-26-2009, 05:39 PM   #17
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what spark plugs are you using?
same problem here with bosch +4 spark plugs...
replaced it with ngk iridium and my car runs better now and
no more cel....)
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Old 04-26-2009, 09:16 PM   #18
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a leaky valve cover gasket could cause a misfire
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Old 04-27-2009, 11:35 AM   #19
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Well I looked down the cylinder with the spark plug removed and I saw some dark black carbon build up in there. Could this be bad? Also there was oil in the plug. Wet plug I guess. I am going to replace the gasket for sure cause there is oil residue on some parts of the engine.

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Old 04-27-2009, 11:36 AM   #20
Zero2_2005
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Quote:
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valve ocver gaskets shouldnt effect the idle

when my x5 plugs were soaked in oil due to the gasket seal leak on the 4.4 with new plgs it was still idled great.
You with new plug though but could oil seep throught the plug's gasket or washers?
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