What is this vac thing for

CyFi · 06-03-2007, 09:16 PM

I dont understnad what this vacuum diaphragm is for. Its located on the throttle body and pushes against the throttle swivel to keep the plate slightly open when there is no vacuum, but as soon as vacuum is applied, it sucks in and doesnt touch the throttle. What is this for?!

TomsMR2 · 06-03-2007, 09:29 PM

keeps the throttle open when the engine is off. i cant imagine why.

shimric · 06-03-2007, 10:18 PM

So the fumes can rise out of engine?? Thats what would happen right as I turned off my 5s and white smoke would come out that smelt like gas.

Hot_Karl · 06-04-2007, 12:57 AM

Its a mechanical safety thing, If the engine is dying, for some unknown reason, then the vacuum also drops, extending this rod that opens the throttle plate a little and keeps the engine running. I dont know the official name.

TomsMR2 · 06-04-2007, 01:47 AM

it'll still easily stall out though..

CyFi · 06-04-2007, 03:31 AM

well i guess all this means im still glad i removed it lol

Mister2.2 · 06-04-2007, 06:45 AM

Weight savings?

shimric · 06-04-2007, 09:06 PM

Gairloch · 06-04-2007, 09:27 PM

Why did you pull it?

If it's completely extraneous deleting it from the system might help with vacuum leaks if that diaphragm is failing. Interesting ...

CyFi · 06-04-2007, 11:11 PM

i pulled it cause i was retarded a long time ago when shimric told me it was why my rpms shot up so high on cold start...lol

shimric · 06-06-2007, 06:51 PM

Quote:

Originally Posted by CyFi

i pulled it cause i was retarded a long time ago when shimric told me it was why my rpms shot up so high on cold start...lol

No I didn't. Don't blame me for your ricer modifications.

CyFi · 06-06-2007, 10:21 PM

Yes, you did tell me, i remember exactly. You said you and tom could find a reason for it and that i should just pull it out

TomsMR2 · 06-07-2007, 12:09 AM

if it was 100% useless toyota wouldnt have included it..

if its leaking down, you can physically see the plunger touching the throttle wheel. theres just not much to the system.

CyFi · 06-07-2007, 12:49 AM

and if it had major uses i wouldnt have pulled it out.

06-03-2007, 09:16 PM	#1 (permalink)
CyFi Moved on Join Date: Oct 2005 Location: Phoenix Posts: 1,401 Thanks: 12 Thanked 38 Times in 35 Posts iTrader Rating: (11/100% )	What is this vac thing for I dont understnad what this vacuum diaphragm is for. Its located on the throttle body and pushes against the throttle swivel to keep the plate slightly open when there is no vacuum, but as soon as vacuum is applied, it sucks in and doesnt touch the throttle. What is this for?!

06-04-2007, 06:45 AM	#7 (permalink)
Mister2.2 Cheese it! Join Date: Feb 2005 Posts: 6,561 Thanks: 121 Thanked 115 Times in 99 Posts Blog Entries: 1 My Google Map iTrader Rating: (3/100% )	Weight savings? __________________ --Josh MR2Trader.com Free to Buy and Sell your MR2 Parts!

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06-03-2007, 09:29 PM	#2 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	keeps the throttle open when the engine is off. i cant imagine why.

06-03-2007, 10:18 PM	#3 (permalink)
shimric OT Ruler, Thread Hijacker Join Date: Apr 2006 Location: tom's moms house Posts: 1,510 Thanks: 42 Thanked 49 Times in 42 Posts Blog Entries: 1 iTrader Rating: (1/100% )	So the fumes can rise out of engine?? Thats what would happen right as I turned off my 5s and white smoke would come out that smelt like gas.

06-04-2007, 12:57 AM	#4 (permalink)
Hot_Karl I'm Hot Join Date: Nov 2006 Location: Pittsburgh Posts: 30 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	Its a mechanical safety thing, If the engine is dying, for some unknown reason, then the vacuum also drops, extending this rod that opens the throttle plate a little and keeps the engine running. I dont know the official name.

06-04-2007, 01:47 AM	#5 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	it'll still easily stall out though..

06-04-2007, 03:31 AM	#6 (permalink)
CyFi Moved on Join Date: Oct 2005 Location: Phoenix Posts: 1,401 Thanks: 12 Thanked 38 Times in 35 Posts iTrader Rating: (11/100% )	well i guess all this means im still glad i removed it lol

06-04-2007, 09:06 PM	#8 (permalink)
shimric OT Ruler, Thread Hijacker Join Date: Apr 2006 Location: tom's moms house Posts: 1,510 Thanks: 42 Thanked 49 Times in 42 Posts Blog Entries: 1 iTrader Rating: (1/100% )

06-04-2007, 09:27 PM	#9 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Why did you pull it? If it's completely extraneous deleting it from the system might help with vacuum leaks if that diaphragm is failing. Interesting ...

06-04-2007, 11:11 PM	#10 (permalink)
CyFi Moved on Join Date: Oct 2005 Location: Phoenix Posts: 1,401 Thanks: 12 Thanked 38 Times in 35 Posts iTrader Rating: (11/100% )	i pulled it cause i was retarded a long time ago when shimric told me it was why my rpms shot up so high on cold start...lol

06-06-2007, 10:21 PM	#12 (permalink)
CyFi Moved on Join Date: Oct 2005 Location: Phoenix Posts: 1,401 Thanks: 12 Thanked 38 Times in 35 Posts iTrader Rating: (11/100% )	Yes, you did tell me, i remember exactly. You said you and tom could find a reason for it and that i should just pull it out

06-07-2007, 12:09 AM	#13 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	if it was 100% useless toyota wouldnt have included it.. if its leaking down, you can physically see the plunger touching the throttle wheel. theres just not much to the system.

06-07-2007, 12:49 AM	#14 (permalink)
CyFi Moved on Join Date: Oct 2005 Location: Phoenix Posts: 1,401 Thanks: 12 Thanked 38 Times in 35 Posts iTrader Rating: (11/100% )	and if it had major uses i wouldnt have pulled it out.