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#1
11-12-2015, 08:24 AM
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Multiple misfires after plug change!
I replaced the valve cover yesterday. Since I was already there, replaced the plugs as well, I used the Bosch +4, funny thing, those were the old ones as well. After replacing the plugs, she started funny, I got a check engine light, I ran the codes and it says multiple misfires. I was wondering if those Bosch +4 need to be gapped? I dont know how that can be done. Any thoughts? 
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#2
11-12-2015, 08:40 AM
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^I don't like +4's on BMW applications. Prefer to run NGK iridiums.
All +4's should come pre-gapped afaik. Maybe you got a bad set? Or the parts guy grabbed a set off the shelf that isn't the correct part number for your car?
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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#5
11-12-2015, 08:56 AM
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More than likely you forgot to attach the ground strap correctly. If it was running fine before then something you touched in the process is more than likely the problem.
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#6
11-12-2015, 09:46 AM
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Misfires
I will check that. Are you talking about that little ground wire that is bolted to one of the studs from the valve cover?
I will double check that. I also do not like those +4 plugs  , When I bought it from Amazon, it said a set of Bosch platinum for BMW X5 , I never paid attention on +4 , I know my fault I hate myself for this 
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#7
11-12-2015, 10:10 AM
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Misfire could be Coil boots thought
Your vehicle may have one of two coil types. One has coil boots on the bottom of the coils. Think short plug wires. Their life is 80K max or 5 years. They are cheap. Purchase and replace them. Note: Different ones for BOSCH vs Bremi coils. Aftermarket only makes one version to fit either. Buy the Bosch or Bremi ones, you will be happier.
Pulling the coils out and pushing them back in, is usually the end of the road for the the boots. Now the resistance in the boot is greater than coil output, hence no spark at the plug gap inside the cylinder. Yes, there is a gap setting on these multi-prong plugs, but it takes a fine wire gaping tool to determine the setting. 99% of the time you are good out of the box but most people view each plug to make sure they were not dropped in transit. I think we discussed the pros and cons of these plugs in another posting. Coil Images below: Old style w/ Boot on left, New style on right
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 11-12-2015 at 11:00 AM. Reason: Fat finger and bad spelling
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#8
11-12-2015, 10:15 AM
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Coil Boots Views
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#9
11-12-2015, 10:20 AM
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The first question we have not asked is, Does the misfire get greater (MORE PRONOUNCED) on acceleration or all the time, idle through 3,000 RPM?
If you put your hand at the tail pipe can you feel the dropped cylinders on each side? (MisFire pulse). Is it random or constant?
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#10
11-12-2015, 10:23 AM
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Review and thoughts
Great video on 3.0 valve cover replacement that makes a point about the EGR vacuum line that runs along the back side of the valve cover. It also show the coil grounds and a few other tips and tricks.
https://www.youtube.com/watch?v=B-TLgNCmTlY
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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