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Vacuum Advance Diaphram Question #973293 11/22/09 09:49 AM
Joined: Mar 2005
Posts: 63
F
frozen Offline OP
Getting the Wheeling Fever
Hi, I am running an 87 22r MT. I am trying to time it after a head gasket install. I disconnect the 2 vac lines going to the vac advance and plug them. I then start the engine and set the timing to 0 deg. When I then reattach the vac lines the timing does not change.

I suspected the vac advance diaphram and removed the dashpot and applied a vacuum to the forward most (top) vac nipple and the arm inside the dist. moved. I applied a vacuum to the rear (lower) vac nipple and there was no arm movement and it felt like I was losing a vacuum.

Is this indicative of a failing vac advance or is this reaction typical?

Thanks for the help

-Pete

From the Off-Road World
Re: Vacuum Advance Diaphram Question [Re: frozen] #973294 11/22/09 06:09 PM
Joined: Jul 2002
Posts: 1,674
stock87 Offline
Body Damage is Cool
Nope, that's a shot vacuum diaphragm. Other symptoms will be failing to fast idle and sometimes a poor idle as well.

Steel yourself, because they aren't cheap. At least when I did mine, http://www.1stttoyotaparts.com/ (A dealer from Washington state) had the cheapest price, even beating out the aftermarket suppliers.

19220-35140 looks like about 120 from the dealer, aftermarket is about the same:

http://www.rockauto.com/catalog/x,carcode,1277535,parttype,7232


My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
--------------------
"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson
Re: Vacuum Advance Diaphram Question [Re: stock87] #973295 11/22/09 08:52 PM
Joined: Mar 2005
Posts: 63
F
frozen Offline OP
Getting the Wheeling Fever
I was afraid you might say that. Thanks for the help

-Pete

Re: Vacuum Advance Diaphram Question [Re: frozen] #973296 11/23/09 03:44 AM
Joined: Oct 2002
Posts: 15,887
kewlynx Offline
Toyota & Classifieds Moderator
*****
Don't toss or core out your old dist. straightaway. You might need to move some of your parts like o-rings, etc to the new distributor, whether you get it from NAPA or online.
I've gotten a few off fleabay in the past as well; worked fine for what I had going on.


http://www.walkablecommunities.org/

Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote.

**ubi apis- ibi salus**
Re: Vacuum Advance Diaphram Question [Re: frozen] #973297 11/23/09 04:54 AM
Joined: Mar 2005
Posts: 37
1stgenboy Offline
Getting the Wheeling Fever
yes that does sound like a bad vacuum can, but only one side. The inside only bumps the timing up about 6* and that is only when it is cold. The outer one bumps 12* whenever it receives ported vacuum. When I had this problem I manually advanced my timing by approximately 5* and left the vacuum hose to the inside nipple plugged. This worked fine with some minor driveability issues arising. Drove this way for a couple of years till I happend to find a vacuume can at pull a parts.

Re: Vacuum Advance Diaphram Question [Re: 1stgenboy] #973298 11/26/09 03:52 AM
Joined: Feb 2001
Posts: 402
W
whitetoy Offline
Mudrunner
My vacuum advance went bad many years ago. I bought a distributor from a wrecker and transferred the diaphragm to my original dizzy. Worked fine.
Years later, I ended up using that cannibalized distributor when my mechanical advance failed.


Rick
1984 4Runner
Re: Vacuum Advance Diaphram Question [Re: whitetoy] #973299 11/26/09 06:35 AM
Joined: Sep 2003
Posts: 1,686
Staceman Offline
Body Damage is Cool
You can get a good used one. Entire distributors on car-part.com below. Shipping should only be about $10 to $20 at the most. Give one or two of these yards a call. Good luck!



Quote
1987
Distributor
Toyota Truck STOCK NO. 000257020 000257020 $15 Auto Salvage Center USA-WI(Neshkoro) E-mail 1-877-666-9632
1985
Distributor
Toyota Truck PICKUP,MW,T,ML,11-84 ,CARB,22R C 099311 $14.95 Marshalls Auto Parts, Inc. USA-OH(Circleville) Request_Quote 1-800-333-2104 Request_Insurance_Quote

1986
Distributor
Toyota Truck 2.4 DISTRIBUTOR W/WARRANTY $14.95 A 090344 $14.95 Marshalls Auto Parts, Inc. USA-OH(Circleville) Request_Quote 1-800-333-2104 Request_Insurance_Quote

1990
Distributor
Toyota Truck PK-UP,MW,T,ML,7-90,C ARB,22R A 099665 $14.95 Marshalls Auto Parts, Inc. USA-OH(Circleville) Request_Quote 1-800-333-2104 Request_Insurance_Quote

1986
Distributor
Toyota Truck A 8705 $12.95 ASAP - A Select Auto Part USA-WI(Green-Bay) E-mail 888-802-2597 / 920-884-1474
1986
Distributor
Toyota Truck 2.4LCRB,F5 A 9011 $12.95 ASAP - A Select Auto Part USA-WI(Green-Bay) E-mail 888-802-2597 / 920-884-1474


85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!
Re: Vacuum Advance Diaphram Question [Re: Staceman] #973300 12/09/09 05:02 AM
Joined: Nov 2004
Posts: 51
R
RustNeverSleeps Offline
Getting the Wheeling Fever
yes, the distrib is a good bet. I got a rebuilt disty for about $50 and the vacume advance was fine (even if the disty WAS a rebuild and the advance was probably used). I got a "new" disty in addition to the advance and it works great!

Re: Vacuum Advance Diaphram Question [Re: frozen] #973301 12/19/09 04:10 AM
Joined: Apr 2005
Posts: 525
yodta Offline
Rock Warrior
yeaht, as noted above, it sounds as though your idle advance diaphragm is torn/rotted.

according to the FSM, the Idle Advance works off of Manifold Vacuum, and is supposed to advance the timing at low to no load conditions by 10-14. the Normal Advance works off of Ported Vacuum through a port on the carb above the throttle plates.

I ended up replacing the entire distributor. got a new distributor from Advance Auto complete with vacuum advance module for less than the cost of the vacuum advance alone. still working after five years or so. if memory serves, it was around $130, and worth it for the increase in drivability/throttle response, fuel economy, and for smoothing out the engine in general.

Last edited by yodta; 12/19/09 04:11 AM.

msg - '87 xtracab

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