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THermol time switch

in 84 euro 930 i am looking for the location of the Thermol Time Switch. pelican shows it on the left side cam but i don't see anything there with a electrical connector? I am trying to trouble shoot a low idle at startup. AAR is working and the WUR is brand new(rebuilt). idle is starting out at 500 and goes up to 750. i need some due diligence done before i go back to the shop.
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08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 05:44 PM
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Maybe some help here?

930-78-3,3 thermo time switch ??
Old 11-14-2011, 06:08 PM
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your idle should start at 1200 then go down to 900 , 950 , I had the same problem ,now it's fixed, The thermo switch is vacuum not electric , in 1984 your distributor should have two vacuum nipples , how you have them hooked up will change your idle on cold and warm start, and one of those hoses goes to the thermo switch, if you can take some pic's and a diagram of your vacuum hoses I can get you Idling right,

Helio
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
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Old 11-14-2011, 06:26 PM
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i will post some pics
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 06:27 PM
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Try adjusting your idle up with the air screw first. Could be that your mixture is too rich and requires just a bit more air via the correction screw. Your thermotime switch won't fix a low idle....it's just for cold starting enrichment and becomes inactive after a few seconds upon starting (thus the term "thermotime"...the temperature as the result of the internal heating element will cause it to become inactive shortly after your car starts running from cold). It simply switches to the cold start injector for that short period, dumping raw gas in post throttle body to facilitate starting.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 11-14-2011, 06:29 PM
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here's a simple way to hook thing up

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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-14-2011, 06:30 PM
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Helio, I think you are refering to #38 (temperature switch) - the thermo time switch is definitely electric and shuts off the cold start injector (refered to as "cold start valve" in your diagram, #8). . .

Last edited by Ronnie's.930; 11-14-2011 at 06:34 PM..
Old 11-14-2011, 06:32 PM
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so off the distributer i see the two lines, i can follow both of them but i don't see either one going to a switch. i will post some pics and try and get the names of what they are going to
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 06:35 PM
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very good your right on it
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-14-2011, 06:37 PM
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your right Ronnie, my bad , but moving in the right direction
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-14-2011, 06:40 PM
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guys this might be a bit frustrating for you as i am not a mechanic dang apple computer i need to restart to get to the pics. 2 minutes...
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 06:44 PM
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84 930 Slant
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08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 06:51 PM
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those pics suck. basically of the distributer there are 2 lines coming off, on is off the front and one is off the back side. the one off the front goes to the back side of what your diagram is calling the inlet manifold, the one off the back is going to the front of the inlet manifold. i hope this makes sense
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 11-14-2011, 06:56 PM
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Quote:
Originally Posted by Ronnie's.930 View Post
Helio, I think you are refering to #38 (temperature switch) - the thermo time switch is definitely electric and shuts off the cold start injector (refered to as "cold start valve" in your diagram, #8). . .
Ronnie, you saved me the keyboard time.

J930, how do you know your AAR is working correctly as you've mentioned? Simple test is to pinch the hose leading to it from the IC shortly after starting her cold, and the rpms should drop - vs. pinching the hose when fully warm and the rpms should not drop (and/or pull the hose off and look inside to see how far she's open). Or you can always remove the AAR and put it in the fridge next to last nights leftovers and see if the disc opens....and conversely put it in the oven whilst reheating last nights leftovers (at around 150) and see that it closes.

Between that and the idle screw setting and/or your idle mixture - and/or your ignition timing, those are the things that affect idle.
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Old 11-14-2011, 07:17 PM
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thanks for the input mark, i guess my test may have not have been accurate on the aar. i pulled of the line going into the front of it while it was cold and i could see that it was partially opened. i ran the car for a few minutes and i could see that it was closed. i think i read that that shows if its functioning or not. Not understanding the system completely i am hesitant to start messing with the idle. after it warms up the idle is at 750 and its really smooth. but when cold its at 500? my thinking is if i raise the idle to 1100 wont that directly affect the idle after its warm. more or less i am trying to figure out the exact problem to tell the dealer this is what is not correct and also try and learn more about the engine for myself.
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 11-15-2011, 05:13 AM
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but maybe the cold start valve is inop as well? i think to see that i need to pull the intercooler and the air box
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08 Ram 1500
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Old 11-15-2011, 05:16 AM
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Good morning J930, lets start with the intercooler on the right side of it there is a hose connected to it that's good, the other out let needs to be plugged, When you say front of the inlet manifold you mean the top torwards the front of the car right, I believe you may have them back wards , those hoses should be hooked up like the last diagram , as soon as you do that your rpm's should change, if they are hooked up correctly let me know, when you do that and I'll give you the next step , which is running the vacuum hose that comes from the inside of the distributor to the temp switch the back to the inlet manifold, the temp switch has 2 vacuum ports, **** on the back of your motor next to the engine oil breather, you should remove your air filter housing for this job,
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-15-2011, 06:34 AM
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well no when i said front i was meaning as i was looking at it. so in relation to the car it would be opposite. on my inter cooler there are 2 outlets off of the right side. one goes to the aar and the other goes to the goldish metal thing that is to the right of the inter cooler in my picture.

off the bottom of the distributor there are those 2 vacume lines. what i was trying to say is that one is right off the face off the bottom and the other one is coming off the back side of it. i hope it makes sense
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08 Ram 1500
15 Ram Eco Diesel
Old 11-15-2011, 07:43 AM
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Quote:
Originally Posted by heliolps2 View Post
which is running the vacuum hose that comes from the inside of the distributor to the temp switch the back to the inlet manifold, the temp switch has 2 vacuum ports, **** on the back of your motor next to the engine oil breather
That thing's a bear to get to, unfortunately. Just to add to the general wisdom pool, the last time I had my motor out I checked the function of that temperature sensitive switch by placing in warm water to see when it opens (around 150 degrees F. is what I saw). If I recall correctly, its function is to keep the ignition timing retarded (until the swich heats up), thus causing the catalytic converter to heat up quicker for emission purposes. Something like that anyway.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 11-15-2011, 08:54 AM
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OK , then are the vacuum hoses connected like the last diagram?
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-15-2011, 10:10 AM
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