How to remove stuck spark plug connector boots on a BMW or MINI
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- Опубликовано: 18 окт 2024
- BLOG ARTICLE: blog.bavauto.co...
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BMW DIY Video - How to Remove stuck spark plug ignition coil connector boots on BMW or MINI
PARTS:
New spark plug connector boots:
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TOOLS:
Pick Tool Set:
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CRC Silicone Spray:
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BMW’s and MINI’s use of “coil-on-plug” ignition coils has been great for improved engine management and efficiency, allowing longer “saturation” times for higher energy sparks and more precise spark timing control for increased engine efficiency and improved fuel economy. All this while also reducing the servicing requirements of the ignition system by eliminating the ignition wires (spark plug wires), distributor cap and rotor (heck, the whole distributor, for that matter!) and associated hardware. However, the newer 4 valves per cylinder, hemispherical cylinder head designs with the spark plugs centrally located in the top of the combustion chamber have created a new maintenance problem with the coil-on-plug ignition coils.
Due to the higher heat and longer service intervals, the spark plug connector boots that connect the ignition coils to the spark plugs (replacing the connector boots on the old-style spark plug wires) can tend to glue themselves to the spark plug insulators (the ends of the spark plugs). This is especially troublesome since the spark plugs are buried deep in the recessed tubes in the cylinder head, below the coils. If you work with these later engines long enough, you will experience spark plug connector boots that will not pull off of the spark plugs. In these cases, you cannot remove the spark plug until the boot is removed, as the spark plug socket will not fit down over the stuck boot ..... or even the remains of a ripped boot.
At BavAuto, we get calls from our customers (it seems like every day) who have at least one boot that will not pull off the spark plug. In many cases, they have been fighting with the offending boot for some time before calling us for that, hoped for, magic formula to get the boot (or what’s left of it) off so they can finish the spark plug or coil replacement job. Well, as it turns out, we do indeed have a magic formula and we want to share it with all of our fellow BMW and MINI owners. Check out the steps we have developed to remove stuck coil/spark-plug boots.
PROCEDURE:
1) If you have the earlier style bolt-on coils that utilize a separate spark plug connector boot and the boot has stayed behind when the coil was removed, first try to pull the boot off with needle-nose pliers. If you have the later style coils (we call them “pencil” coils) that have integral connectors with just a short boot/sleeve at the bottom, and the boot/sleeve has pulled off the coil end or ripped and left a partial section on the spark plug, go to step 3.
2) If the pliers just rip the boot, grasp the center electrical connector portion of the connector boot and pull outward. If the complete boot comes out, great!. If the electrical connector pulls out, go to step 3.
3) Now that we have a hollow boot, we can apply a shot of spray silicone into the boot. After spraying the silicone insert a long pick tool or small flat-blade screwdriver down through the boot. We want to gently force the tool between the inside wall of the boot and the spark plug insulator. This will break the seal and allow the silicone to seep between the plug and the boot.
4) Use the needle-nose pliers or long pick tool to pull the boot off the spark plug.
5) When installing the new parts, apply a small dab of silicone grease to the inside of the connector boot or sleeve before assembling on to the spark plug. This will prevent future boot removal problems.
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All products noted in this video can be purchased in our online store, www.bavauto.com/, 24 hours a day, 7 days a week. You are also welcome to e-mail us at info@bavauto.com or call into our headquarters and speak to our knowledgeable advisors at (800) 535-2002 (Mon.-Thurs. 8AM to 9PM EST, Fri. 8AM to 7PM EST, and Sat. 9AM to 4PM EST
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For people in 2018/2019; this method is perhaps the best way of getting a melted/stuck ignition coil boot out. My E70 N52 ignition coil was melted to my spark plug and I purchased a set of automotive pick tools to try and fish it out. CRC heavy duty solution is fantastic if the boot is stuck on but not if its melted to the top of the spark plug. I had to use a straight pick to stab around the top of the spark plug in a circular motion until I was able to grab the very end of the boot with a hook pick. Don't use needle nose pliers on melted coil boots because you could end up breaking the rubber apart and have a much larger issue. This method can take hours so just take your time and it will eventually work and be sure to take breaks.
Good stuff Bavarian Autosport!!!
Okay this is actually a great video, showing all the best techniques. I appreciate this.
This just happened to me. Removing center coil, greasing the inside of the boot and shimming the grease down along the top portion of the spark plug worked like a charm! Thanks!
Thank you for this video. The silicone spray was essential to fixing of this problem for me, the broken boot was being very difficult. Hadn't seen or needed hook and pick tools before, very useful.
Saved the day for me thanks for this! I just used a coathanger and brakleen but same process
Went to change my aunts spark plugs yesterday and this video saved the day.
Thanks, the silicone trick worked for me. I didn't need the pick. For my Hyundai, I reattached the top part of the ignition coil to the stuck section. Once I pulled the coil out again, everything came off because of the lube
Thanks a million, Otto, for your good advice!
That's Exactly what i used on my 2009 Ford Edge with stuck boot tip !
First the straight pick to try to break the bond between the plug and the boot, then the hook pick which got the whole tip, by the last one i was pretty proficient at it, after learning the technique and having the first couple come out in pieces.
Thanks sticking that thing in there worked perfect to break it free
so very thorough, thanks for this!
If you would, please answer these questions.. I have a 2015 VW Golf, which apparently has the same coil / boot construction. My car was running great, but 60,000 miles and still hadn't changed the plugs. Last night I pulled very hard on all four coils and the boots seem glued to the plugs. The coils have NOT separated from the boots. At this point, I'm asking myself if I should just put the car back together and let a mechanic do the job. But wondering if the coil pack and conductors have been damaged by all the pulling. Is that likely?
If so, would it be advisable to pull up on the coils and cut the boots just below the coils, so I can then use the silicone and pick process? Or should I apply more pulling force?
I have this same problem! Happened on 2 cylinders but one I was able to take it out with pliers. The other was melted with the spark plug. I’m going to try this method. Only problem is, I have pieces of plastic boot in the hole of the spark plug in the very bottom. And I don’t want it to fall inside the engine when I take out the spark plug, any thoughts?
Another great video... you guys really know your stuff. Thank you for taking the time to make these videos. They are most helpful :D
Just saved me. Big thank you.
Thank you so much for this video 👍😊
Thank you for this video, helped me greatly!!
Those long pliers are awesome, what brand are they?
Don't recall the brand on that pair (they may be Cresent). They are available from most main-stream plier manufacturers. Articulated long needle nose pliers.
Thank you sir.....this trick works a 100%
very good video
Big help
Thank you
good presentation
This is awesome .
Isn't the hex still exposed? If so, could you not use the pass through hollow socket set on it? I forgot the name but I have a GearWrench and I know Craftsman, Harbor Freight and others also have similar set. As long as the boot is thinner than the hex diameter, the hollow socket will slide over and reach the hex.
If the socket is long enough and has a full inside diameter large enough .... yes. Typically, though, this won't work.
You are absolutely right. I just checked my pass through set and it is NO GO. Even real deep and thin socket will not be deep enough. Your way of removing it is the only way. Thank you for showing how to do it.
Bavarian Autosport
It kinda worked for me, all four of mine were stuck really bad and i couldn't clean it all out, i cleaned just enough to make sure that socket fit over remaining rubber and removed them. Worked really well and didn't need to completely remove all of boot rubber melted onto plugs which would take forever. Used vaccuum and air compressor to blow out chunks
what happens if the top of the rubber is below the top of the plug (as in my case) you cant do it.
Does it attach to the upper stem of the ignition coil? If so, after spraying some silicone, wait for it to settle and then attach the upper stem of the coil again. Hopefully when removing the stem again it will come out with the lower portion as well due to the silicone
Thank you so much! Saved me!
Hello guys, fuel pump die on me , car was parked for 2 months , now I got the fuel pump replaced and new battery and the car wont start, , any Idea why ? starter problem ?? the fuel pump does have energy I can hear it. but I have no crank ! any tips ? thanks for your time .
Didn't see this case before :)
This doesn't make since the boot can only go so far onto the spark plug which is the tip of the plug.it can't go pass the nut. The wire in boot clips on to the top of spark plug. Explain how the boot when it breaks slips down pass the tip of spark plug??
where did you get the hook
Good
Can you do a vanos rebuild video thanks
We may not end up doing a video, but we do have a full photo DIY on rebuilding the M54 Double VANIOS.
blog.bavauto.com/13829/bmw-diy-double-vanos-repair-rebuild-on-m52tu-m54-and-m56-6-cylinder/
Yes same thing with Hyundai Sonata hybrid it’s a pain in the ass to remove them thank you good video the engineer needs to be done a little more smarter
Same problem on my volkswagen. Ughh