Really Fast Double Throttle Diaphram Question.
#1
Full Member
Thread Starter
Join Date: Mar 2006
Location: Orange County
Posts: 235
Likes: 0
Received 0 Likes
on
0 Posts
Really Fast Double Throttle Diaphram Question.
Hey Guys, I was wondering how important the double throttle diaphram is in the idle process, more specifically when the car is already warm. Thanks!
#4
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
On your 86 non turbo, if the double throttle diaphram is busted, then the outer set of throttle plates are spring loaded to full open all day long.
IF the double throttle diaphram actually is working, then the outer set of throttle plates will pull to the full closed position when the engine water is cold. Once it warms up fully, the double throttle diaphram loses it's vacuum source and goes fully open the rest of the day as long as the water is fully hot.
On a turbo car it works similar but different. Once the diaphram loses it's vacuum, the outer set of throttle plates stay closed, unlike the non turbo car, but will open fully as the throttle is opened, if the water is fully warmed up and the diaphram has lost it's vacuum source.
ON the turbo if the water is still cold and vacuum exists at the diaphram, then when the throttle pedal is depressed, the outer set will stay closed. They're being held closed by the vacuum on the diaphram.
IF the double throttle diaphram actually is working, then the outer set of throttle plates will pull to the full closed position when the engine water is cold. Once it warms up fully, the double throttle diaphram loses it's vacuum source and goes fully open the rest of the day as long as the water is fully hot.
On a turbo car it works similar but different. Once the diaphram loses it's vacuum, the outer set of throttle plates stay closed, unlike the non turbo car, but will open fully as the throttle is opened, if the water is fully warmed up and the diaphram has lost it's vacuum source.
ON the turbo if the water is still cold and vacuum exists at the diaphram, then when the throttle pedal is depressed, the outer set will stay closed. They're being held closed by the vacuum on the diaphram.
#5
Full Member
Join Date: Jan 2002
Location: Bay Area, CA
Posts: 100
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by HAILERS
IF the double throttle diaphram actually is working, then the outer set of throttle plates will pull to the full closed position when the engine water is cold. Once it warms up fully, the double throttle diaphram loses it's vacuum source and goes fully open the rest of the day as long as the water is fully hot.
#6
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
The car will bogg and have poor acceleration until you drive a couple of miles where upon the water temp will then be up over 120 and the car will drive better or act more normal
In other words you need to drive gently til the water warms up. Drive gently and the car will be ok for those first couple of miles.
I've never owned a RX that had a working double throttle diaphram. All were/are busted.
And like they say, you shouldn't be driving a cold engine hard until the engine gets warmed up.
In other words you need to drive gently til the water warms up. Drive gently and the car will be ok for those first couple of miles.
I've never owned a RX that had a working double throttle diaphram. All were/are busted.
And like they say, you shouldn't be driving a cold engine hard until the engine gets warmed up.
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM