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Old 07-11-2013, 11:49 PM   #1
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Feels like a miss?

Just put new bosh platinum 4 plugs in my 2000 gt they are pre gapped plugs. Now I have a miss? Or what feels like a miss it shutters every now and then unless I'm into it I can only notice it when cruising. I tried pulling each wire from the coils to hear a difference in sound when unplugged all affected the motor did the same with injectors. Here is another q when doing the plugs I took the little box filter out that goes from the iac to the intake and used the same size line with an elbow just to clean up the look under the hood was told it wouldn't affect anything? Could that be a fuel filter I have not changed that but I need to do alot of driving this weekend and can not have this issue any help would be appreciated. Thanks in advance
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Old 07-12-2013, 01:56 AM   #2
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Did you use dielectric grease on the cop's?
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Old 07-12-2013, 04:43 AM   #3
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Quote:
Originally Posted by Mfore33 View Post
Did you use dielectric grease on the cop's?
No I did not
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Old 07-12-2013, 04:54 AM   #4
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They may be pregapped plugs but not necessarily for our cars. I always check the gap no matter what. I would take the back out and recheck them might just be a little off but thats all it takes.
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Old 07-12-2013, 08:10 AM   #5
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How do u gap the four prong ones?
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Old 07-12-2013, 09:02 AM   #6
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I've always been told that the Bosch platinum 4's are no good. You should stick with motorcraft plugs if your car is pretty much stock. It could be your fuel filter or maybe your coil on plugs are old and need to be replaced.
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Old 07-12-2013, 09:04 AM   #7
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Didn't have any issues before changing the plugs. Going to try the fuel filter but ill keep on mind about the bosh plugs
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Old 07-12-2013, 03:19 PM   #8
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Take those Bosch out but save them as a reminder to never put anything in that engine but the OEM Motorcraft spark plugs...
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Old 07-12-2013, 04:14 PM   #9
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Possible the resistance of the bosch plugs have made one or more of your old cop's random fail from the difference in resistance of the ford plugs. When cop's get old they have less tolerance cause of the wear and cycles on them.
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Old 07-12-2013, 04:39 PM   #10
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Motor craft or Ngk plugs only in these cars. They hate Bosch plugs
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Old 07-13-2013, 01:27 PM   #11
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Motor craft are installed fuel filter in didn't change anything put new gas in from my normal station is running much better but still ever so often I can maybe feel it miss
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Old 07-13-2013, 01:37 PM   #12
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Like Mfore33 said, they probably took out a weak COP.
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Old 07-13-2013, 03:18 PM   #13
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Coil on plugs man.
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Old 07-14-2013, 12:12 AM   #14
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Purchase a cheap coil from jegs for around 17. Use it to diagnose the weak coil. Start with cylinder 1 and swap in the cheap coil. Drive it for a few days and see it the problem stops. If not move the now coil to cylinder 2. I know people will give me crap for the cheap plug but is is the best way I've found to test problems. If you find a bad coil I would suggest replacing with a factory motorcraft coil.
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Old 07-15-2013, 04:49 AM   #15
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Yea unless you are boosting in some way anything dealing with plugs doesnt need to be changed. You can put every bolt on there is and you should be fine with oem. My buddy is running every bolt on on his 2000 GT and it runs perfect with oem plugs then again a tune is suggested when you put on a cai and bigger throttle body/ plenum to keep a good air to fuel ratio.
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