Bill Z
Donating Member
Re: Runs Bad at Off Idle when It Gets Hot. Need Pertinent Suggestions
Mettles expand at different rates when heated. The Throttle body is made of a steel shaft and aluminum housing. My understanding is that there isn’t any brass bushing material there. Through normal use, any grit that gets in between the housing and the shaft (sucked in by the vacuum) will (after a while) cause sufficient ware to cause a vacuum leek. I guess the ware is dependant on the driving conditions (dusty area or not). The hotter it gets the wider the expanded whole gets and the worse it affects the vacuum or air to fuel ratio.
My truck ran fine under boost. Any leakage there won’t be noticed much. However, the place I had my problems was just off idle. That place where you want to start going because the light turned green and your wife is in the truck next to you holding a big chocolate milk shake with no lid. Now, if you cause her to spill any of it, it is dog house for you tonight.
But, like I posted above, in my case, Things are much better now that I stopped the leeks with some plumber’s high temp grease. The throttle body will be going in for a complete rebuild to include sealed bearings.
I was thinking and wanted the opinion of others about this next thing. The throttle body has a passage in it where the hot water from the radiator was designed to flow. I know, -> stupid idea. But what about passing the intercooler water through there to cool down the TB? The passage is a choke point but with a big enough IC pump, it may help.
Anyone try it yet?
purdaddy said:
Mettles expand at different rates when heated. The Throttle body is made of a steel shaft and aluminum housing. My understanding is that there isn’t any brass bushing material there. Through normal use, any grit that gets in between the housing and the shaft (sucked in by the vacuum) will (after a while) cause sufficient ware to cause a vacuum leek. I guess the ware is dependant on the driving conditions (dusty area or not). The hotter it gets the wider the expanded whole gets and the worse it affects the vacuum or air to fuel ratio.
My truck ran fine under boost. Any leakage there won’t be noticed much. However, the place I had my problems was just off idle. That place where you want to start going because the light turned green and your wife is in the truck next to you holding a big chocolate milk shake with no lid. Now, if you cause her to spill any of it, it is dog house for you tonight.
But, like I posted above, in my case, Things are much better now that I stopped the leeks with some plumber’s high temp grease. The throttle body will be going in for a complete rebuild to include sealed bearings.
I was thinking and wanted the opinion of others about this next thing. The throttle body has a passage in it where the hot water from the radiator was designed to flow. I know, -> stupid idea. But what about passing the intercooler water through there to cool down the TB? The passage is a choke point but with a big enough IC pump, it may help.
Anyone try it yet?