Throttle body heater delete (Page 2/5)
Yellow-88 AUG 31, 09:26 AM

quote
Originally posted by cartercarbaficionado:

if you keep the egr installed (but no vaccum) it syncs a bit of heat Into the throttle body. but the coolant is definitely redundant and just to keep it around a certain temp range but just like the cold start injector it is certainly not required



Why would you have an EGR with no vacuum line? Yeah, you do need a cold start injector. I think you mentioned once that you have to crank a long time to get started. Could that be the problem?
Dennis LaGrua AUG 31, 09:55 AM
Never believed that the throttle body heater lines did much good. Few if any vehicles use such a scheme, an engine compartment is hot to begin with and the throttle body sits near the exhaust crossover pipe. I've always removed the lines, put plugs in the tb, capped the connections at the water neck and have had no issues.

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[This message has been edited by Dennis LaGrua (edited 08-31-2024).]

82-T/A [At Work] AUG 31, 10:15 AM

quote
Originally posted by Dennis LaGrua:

Never believed that the throttle body heater lines did much good. Few if any vehicles use such a scheme, an engine compartment is hot to begin with and the throttle body sits near the exhaust crossover pipe. I've always removed the lines, put plugs in the tb, capped the connections at the water neck and have had no issues.




Are there similar cars from that era that use coolant lines on the throttle body or intake? It seems like it's just a slightly newer version of the "ThermAC" if you will... but I don't think I've ever seen anything like that on other older cars that I've owned before.

On my old VWs, there's a thermostatically controlled "flap" that allows air to pass through the cooling fins on the cyl heads. But I suppose that's not really the same either, as that's just more like a thermostat controlling the temperature of what would be the coolant (if you will).
Yellow-88 AUG 31, 10:36 AM
I have to wonder if the same guy who designed the tubes for the evaporative canister did the TB heater lines. Who ever it was had a thing for fancy looking long tubes.
Raydar AUG 31, 02:20 PM
Everybody talks about the throttle body icing, while thinking about carbs icing.
What they are not taking into account (and I expect I may be opening a can of worms, here) is that carbs have to deal with the added effect of evaporative cooling from the fuel.
The V6 throttle body is dry. There is no fuel to evaporate.

I took off my lines, years ago. Made it so much easier to get to the distributor and other stuff.
cartercarbaficionado AUG 31, 06:37 PM

quote
Originally posted by Yellow-88:


Why would you have an EGR with no vacuum line? Yeah, you do need a cold start injector. I think you mentioned once that you have to crank a long time to get started. Could that be the problem?


It was an example of how to do an egr delete yellow. just leaving everything installed but giving the egr no vaccum and removing the egr solenoid by the thermostat.my long crank was caused by a few leaky gaskets I've since replaced and the csi only working when warm (no idea why it just did that and I've since replaced the sensor and verified the wiring so no idea)
Yellow-88 SEP 01, 06:05 PM

quote
Originally posted by Raydar:

Everybody talks about the throttle body icing, while thinking about carbs icing.
What they are not taking into account (and I expect I may be opening a can of worms, here) is that carbs have to deal with the added effect of evaporative cooling from the fuel.
The V6 throttle body is dry. There is no fuel to evaporate.

I took off my lines, years ago. Made it so much easier to get to the distributor and other stuff.



I feel silly for missing that. Thank you.
Yeah when you think about how a refrigerator works.... Ice box throttle bodies.

One does have to wonder what were they thinking? I think it's because some engineer at GM just liked tubes. That wouldn't surprise me at all. Or someone High Up heard stories of dangerous throttle body snow balls that strand grand mothers on cold foggy nights !!!

"Make sure they get heaters on the throttle bodies." "OK boss."

Cost wise, It would add a couple of operations on the assembly line and create one more possible supply chain issue. Complicate repair, complicate service manual drawings and part numbering ....... Can O Worms.
Patrick SEP 01, 06:17 PM

quote
Originally posted by Raydar:

Everybody talks about the throttle body icing...



On the contrary, it seems to me that everybody has mentioned that the 2.8's TB doesn't ice up. Yes, keeping in mind that no atomizing of gasoline is taking place in the 2.8's TB, the installation of the factory heater tubes appears to be rather unnecessary.

I remember years ago watching ice form on the Rochester carburetors of whatever Chevy I happened to own at the time. It was like having a mini refrigeration unit sitting atop of the intake manifold.

[This message has been edited by Patrick (edited 09-01-2024).]

82-T/A [At Work] SEP 02, 02:28 PM

quote
Originally posted by Patrick:

On the contrary, it seems to me that everybody has mentioned that the 2.8's TB doesn't ice up. Yes, keeping in mind that no atomizing of gasoline is taking place in the 2.8's TB, the installation of the factory heater tubes appears to be rather unnecessary.

I remember years ago watching ice form on the Rochester carburetors of whatever Chevy I happened to own at the time. It was like having a mini refrigeration unit sitting atop of the intake manifold.




This thread had me thinking earlier today when I was working on the car with my daughter. The A/C lines run right along the fuel lines for the 4 cyl / Iron Duke Fiero. I was wondering if it would make any difference in engine efficiency if I wrapped the pressure fuel line next to the pressure line from the A/C compressor... haha... it would cool the fuel line and provide some cool fuel into the TBI unit. Perfect for icing... and that's when I changed my mind.
Yellow-88 SEP 02, 06:08 PM

quote
Originally posted by Patrick:

I remember years ago watching ice form on the Rochester carburetors of whatever Chevy I happened to own at the time. It was like having a mini refrigeration unit sitting atop of the intake manifold.



Yeah, chill your bear on the Rochester and roast a weenie the manifold. Yeah.
I wonder if anybody ever did it?