Deleting throttle body heater plate.

[cristimm]

Upper water outlet capped off at head.

Where can I buy some caps like that?

[cristimm]

About a year ago I did a "half delete" meaning that I deleted just one of the 2 heater plates.



I left connected just the small U-shaped one bellow the TB which can be removed very easy without disconnecting the hoses.

[Jorgeconrico]

Where can I buy some caps like that?

Got mine at pep boys in the "help" section. I used these caps at the block and on the coolant pipe. I did this "mod" for the second time about 8 months ago and the rubber caps are dry rotting, but they should be ok....for now. I doubled up the caps on the engine block.

[Ricer Ennemi]

What is the point to delete the heater plate??

I dont like my TB to be heated.:confused:

[PumpItUp]

got question guys
////
V.V
---
\_/

[PumpItUp]

The gaskets I had on the heater plate & throttle body were metal. Replacement is paper. Is there any reason for that. Can you reuse metal intake gaskets :confused:

[cristimm]

They were metal to transfer the heat better. If you want more isolation use the paper ones.

[E36-italia]

I just removed the throttlebody heaterplate on mine... well removed not.
Disconnected it, because it was leaking engine coolant into the inlet manifold, and thus the engine.

I left the heaterplate between the inlet manifold and the throttle body otherwise it might screw up the mixture.

As i live in italy.. it hardly get's cold, getting so subzero cold air into the engine should not be a big problem.

[Eric Happy Meal]

just finished mine tonight (as well as a host of other things) and to clear up some of the issues here.  the reason for the TB heater is to help pass smog, as your fuel vapors and valve cover breather routes right back into the intake PRIOR to the TB, which will ultimately help the evaporation and atomisation of the vapors.

ALSO, dont worry about capping the hole on the side of the block, as the M44 doesnt have this.  It has another one of those plastic pipes on the back of the cylinder head, and im fairly certain that the M44 and M42 share the same coolant passages on the block/cylinder head.  And also the M44 did not have the TB heater plate, so it is perfectly safe to assume that the reason for that is for the TB heater plate.

Also, you could make the point that re-routing that hole in the side of the block actually hurts you, as you would be diverting coolant away from the back of the cylinder head.  But, of course the water pump is perfectly strong enough to get it flowing all the way to the back, so this might not be the case.  BUT, rest assured that by re-routing it your are most definitely NOT helping the engine in any way.


The TB heater plate does NOT help in warming the car up.  the coolant passing through it is cold, and only heats up as the engine already is.

The TB heater plate does NOT help in removing ice on the TB.  same issue, are you getting ice before you start the car, or is it happening once the car is already fully warmed up?

[DesktopDave]

I'd suspect 95% of the world has no real need for that heater.   Possibly some high-altitude driving on cool wet days with big throttle inputs can ice that throttle body up a bit.   A little bit of vacuum can ice carb or TBI butterflies at a surprisingly high outdoor temp...well over freezing if it's a very wet day.   Multipoint injection systems like the M42 aren't usually susceptible to this, though potentially it could happen in pretty extreme climates.

My theory is that since aluminum heads & intakes radiate (lose) much more heat than plastic or cast iron...the TB heater helps to regulate heat in the system.  I'd suspect that removing some variables from the motor's operating parameters helps the engineers to tune it properly.  The heater also increases mileage slightly & decreases emissions.  Warm air & fuel is slightly better for efficiency/mileage.  A higher temperature thermostat will help mileage as well.  Neither are good for power though.   The more of a difference you can make in heating up the air, the more power the motor can make.  Denser cool air can make more power but (of course) burns more fuel.

It'd be great to have a mod that worked both ways, but you can't get something for nothing.  Maybe a flap that pulls warm air off the exhaust when idling but cold air at WOT.

[Eric Happy Meal]

note*  i was buzzed when i wrote that last night.  the M44 DOES have a heater plate in there, but it is filled from the back of the cylinder head, not from the middle.

[esager]

Quick one for the group. I have completed my own "delete" and am putting it back together. However, I also replaced all the heater hoses going into the firewall. I saw another thread where the auxillary thermostat was simply deleted and I did the same but before I put everything back together again, I wanted to ask if this is a good idea or if I should cut the new hoses and splice in the aux. thermostat. It seems it was installed after the fact for a recall, so I think it will work fine without it, but just thought I would ask. Thanks.

[Balleristic31]

Did the delete about 3 weeks ago on my m42. I capped both of the coolant passages and have had 0 issues so far. I will post pics of the caps and my vaccuum solutions in the next couple days.

[rac3r]

I've had my throttle body deleted for about a year now. The rubber intake boot has to stretch a little farther because of the mod. I've noticed that my 1 year old boot is starting to show signs of cracking already - possibly due to it being stretched. Does anyone else have this issue?

[rx82000]

What is best?

Option 1: Capping of the input and the output of the TB heater plate.
or
Option 2: Installing a bypass between the input and the output of the TB heater plate.

Thank you.