Deleting throttle body heater plate.

[KenC]

I'm planning on replacing all the hoses as well as deleting the heater plates.  I'm wondering what people are doing about the outlet between the 2nd and 3rd cylinder.  Is a simple cap sturdy enough? I know I read some doubts about it's ability hold up (semi) permanently.  Or are most of you guys bolting and welding it off.  I'm a little nervous about the permanent nature of it as well as I don't have access to a welder (suppose I could find someone at a shop to do it).  Just kinda looking for the final say on the outlet.  Thanks

Plug it into the block coolant hose.

[Cobra Jet]

So, has it been 100% confirmed that by plugging the port on the coolant PIPE and plugging the port on the HEAD will not ever cause any detrimental effects to the head and/or engine?

The below pic is of the "tropical/African" solution on an M42 that was rebuilt by a user on bimmerforums (http://forums.bimmerforums.com/forum/showthread.php?t=433471&page=3) - note the plugged coolant pipe port & plugged port on head:



Currently, on my M42 the factory "medusa" hosing under the intake has all been deleted when the engine was rebuilt.  However, there still remains a single rubber hose going from the black coolant pipe to the port on the head (pretty much like how M42 Member tjts1 had originally modified his M42 and was posted in a prior thread of his)...  If this single looped hose on my M42 is deleted as has been done w/ the above pic, will there be ANY cooling issues at all??  Has the thought & discussion been 100% confirmed that such a deletion can be accomplished with no ill or adverse effects on the head and/or engine?

[CCR Engineering]

If you consider the rather large number of people who have done it I would say you already have your confirmation.  If you follow the coolant flow that is nothing more than a minor bypass, it will otherwise go through the motor as intended.  The coolant would normally be coming out of the head and into the plastic pipe so bypassing it simply makes it run through the head and out with the rest of the coolant into the right side of the radiator.  The preheater offered no heat dissipation or routing of any value.

[bmwpower]

That may be, but I'm not sure I would consider the method of closing off the passages as good practice.  I'd rather put a hose on there connecting the two nipples than risk the bolt cracking the plastic nipple.  Threading the metal nipple is chancy especially with a steel bolt.

[charlesmarseille]

anyways, i guess ive got a really weird car, cause it happens at least every night, and tonight it was about -10C, and when i turn off the car, wait 30 seconds, it goes fine after. dont really understand, i wish itll be good when its hot outside.

[Cobra Jet]

anyways, i guess ive got a really weird car, cause it happens at least every night, and tonight it was about -10C, and when i turn off the car, wait 30 seconds, it goes fine after. dont really understand, i wish itll be good when its hot outside.

WHAT???  does this even pertain to this thread?

[charlesmarseille]

well im sorry cobra if im not in the good thread, but this problem occured about 5 minutes after this mod, and it didnt happen before so go find out!

[DouglasSmith]

The previous owner did this mod to some degree. I tried checking online and looked through this thread, but I couldnt find the answer. What does this mod do?

What are the pros and cons of this mod?  Here is what my engine bay looks like. Does it look like it was done correctly?



Without boot/airbox

[3bvert]

dont use the helper block off caps !!!!!

well at least I would not. I did the delete in december, and ran the hose  loop, not the caps.  
however I also deleted my ac, and for the time being just cut off the large metal pipe where it passes next to the strut tower.  to clean it up I put on one of thos eblock off caps . here 8 months later, the cap is all cracked to crap, would hate to see how long it would last with pressure and hot water

next time I have to pull the intake, I think Ill do that bolt cap off on the head and hose re-route since some of you are having no problmes with it
and Ill get rid of the rest of the ac lines, when I do my heater core  before this winter

[Massimo]

I did the removal used a rubber heater hose cap for the plastic part and a plug for the head part as they did not have a cap in that size. I also straped the ICV to the mainifold using some zipties, im not liking it very much. But it will do for now untill my holidays when i pull it all apart again to paint it, then ill clean it up a bit more. Other wise it has been great.

Ill post some pics tonigh for yal.

[LeanE30]

..i'm gonna cap mine in a week or so. already bypassed the medusa on the ICV and Valve cover breather, just left the coolant lines of the medusa where they were - oddly enough mine had the medusa lines but no heater plate at all...? go figure.

this will happen after i do the TRE340 that i just ordered like 30minutes ago.

[LeanE30]

got into it and there is a heater bulb attached to the bottom of the TB, no plate sandwiched between the TB and IManifold like i've seen on all other m42s. I'm gonna try the Rubber Caps.

I'll keep you all updated with the aging process.

[tonywonder]

Great thread I will be doing this very soon.

Anyone in California having issues with SMOG after doing all this?

[Ernest]

Great thread I will be doing this very soon.

Anyone in California having issues with SMOG after doing all this?

I'm in california.  Two visits to a test only station and no issues with smog.

[dinu.negrean]

Have done this mod just because it is such a pain in the nuts to remove the TB everytime I need to take the intake off. A lot easyer to take it off right now. E36 M42

The first observation: increased fuel consumption with 1l-1,5l/100km. No other problem whatsoever.