Jump to content
lak1965

1998 522XI coil replacement

Recommended Posts

lak1965

I just bought a 1998 522xi with a backfiring issue through the muffler at full speed, it also runs a bit rough. I cleaned the gas tank, replaced the fuel filter , carburetor and plugs but now need to try to replace the coils. I cant seem to figure out how to remove the rear shroud to get at the coils. Does anyone know a way to do it without removing the engine?

 

Thanks in Advance 

  • Like 1

Share this post


Link to post
Share on other sites
 
19richie66

Sounds like something other than the coils. Does it idle rough? There is a small pickup tube in the carb that has tiny o rings on both ends. It will suck air around this and run like crap. As far as the coils, You have to pull the engine. There are two small screws at the bottom that have to come out and two on the lower sides. I am getting ready to do it myself on the one I just got. However I will be trying to split the cover so when/ if I have to do it again, I will just be able to remove the top half. At least the plan I have in my head says I can 😂

Edited by 19richie66
  • Like 2

Share this post


Link to post
Share on other sites
 
lak1965

I did rebuild the old carb twice and clean it before I decided to buy a new one. If its not the coils then the only other thing I can think of is the valves. It runs a little rough but at full throttle it backfires and runs like crap unless I have the choke on a bit. It did the same thing with both carbs but seems a little better with the new one. The valves are hydraulic so I cant adjust them. My brother and I did check the spark with a plug light and it seemed OK on both sides but I'm just trying to eliminate possibilities at this point.

Edited by lak1965
  • Like 1

Share this post


Link to post
Share on other sites
 
19richie66

Could have a piece of carbon on a valve holding it open too but I would think it would do it all the time. Flywheel key could be sheared too and throwing off the timing just enough. Be interested to see what you find.

  • Like 1

Share this post


Link to post
Share on other sites
 
wh500special
6 hours ago, lak1965 said:

.... I cant seem to figure out how to remove the rear shroud to get at the coils. Does anyone know a way to do it without removing the engine?

 

 

You have no choice but to remove the engine.   

 

It’s less work than it looks and you need to do it anyway so you can clean the cooling fins on the engine since it’s probably never been done. 

 

When you have it out, take the opportunity to install the Kohler kit that lets you access the cooling fins w/o removing the blower housing next time.  It’s been mentioned in this forum before, so it should pop up in a search. 

 

Steve

Edited by wh500special
  • Like 1

Share this post


Link to post
Share on other sites
 
Kurt-NEPA
23 hours ago, wh500special said:

When you have it out, take the opportunity to install the Kohler kit that lets you access the cooling fins w/o removing the blower housing next time.  It’s been mentioned in this forum before, so it should pop up in a search.

 

If there is a kit to allow access to clean the cooling fins, I am interested in the details.  Pulling the engine to remove the shroud on a 5xi is a pain.  But that is what I need to do this spring on my 522xi.  Its running a bit hot.

  • Like 2

Share this post


Link to post
Share on other sites
 
 
 
 
lak1965

Got the clean out panels ordered along with head gasket kits, might as well look at those heads while I'm at it. Would have been nice to have this thing running right, I have a 2 stage snow blower I bought for it for short money. 

Edited by lak1965
  • Like 2

Share this post


Link to post
Share on other sites
 
19richie66

The other thing I was thinking of is that these engines have the smart spark box on them above the left valve cover. Maybe it is wigged out and advancing or regarding the timing too much? Just a thought.

Edited by 19richie66
  • Like 1

Share this post


Link to post
Share on other sites
 
lak1965

It Appears that there are 2 different size coils in the beast. One of them, the small one, was not reading properly on the multimeter. It also has a melted coil wire someone taped over. 

 

IMG_2554.jpeg.73c65ab52c7482f32c4a14b60243eb58.jpeg0216191646.jpg.0b9a165d20d0151d794cf75a87ab9e15.jpg

 

One of the intake gaskets were torn and I think it was sucking air into one of the cylinders causing the backfiring .0216191246a_HDR.jpg.16a39c35c08f8955a403a0e532b9866d.jpg

 

My brother an I also figured we would remove the heads and decarbon and inspect while the engine is out.

 

0216191636.jpg

0216191637.jpg.6abfb623d64b7c5b7b9103a27c0c42bc.jpg

0216191637a.jpg.dc2dc0a1a58586c2aaa3385069c45f2d.jpg

 

Doesn't look too bad, some funky wiring problems that need tube fixed but a good going through and cleaning and I think will be like new.

 

Access Panels

IMG_2560.jpeg.57a78c2c3d0b0b1c828f918cca0da926.jpeg

More pics to come.

 

 

 

 

Edited by lak1965
  • Like 2
  • Excellent 1

Share this post


Link to post
Share on other sites
 
19richie66

Now I have to find the time to do mine.

Share this post


Link to post
Share on other sites
 
lak1965

The problem found!

 

0217191159.jpg.cced49d22a63a60c8d7e4bb8408ab4e5.jpg

 

Access panels going on.

0217191109.jpg.31f99507d77a1d2c3ccd58efc01829c6.jpg0217191120a.jpg.79ba3dc008b5cf6f8842ae88f502670f.jpg

 

Intake back on with intact gaskets also both heads decarboned and torqued to 30 foot pounds.

 

0217191316_HDR.jpg.b03910c7326b73d861cdc31f325b5cc9.jpg

 

Just about ready tout back in , tomorrows job.

0217191652a.jpg.209dbcda95616d75f9eac362be2b1895.jpg

 

  • Like 3
  • Excellent 1

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×