Seeking Cold Start Information - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 9 (permalink) Old 10-20-2018, 07:25 AM Thread Starter
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Seeking Cold Start Information

Hello All. It has been a long time. I have dropped off due to ongoing health problems. Got the 88 Quad (red of course) out of storage after changing out old fuel. Hard to start. I suspected cold start injector and dry tested it out of the intake manifold. Not working. I want to test it off the car to see if it is working or not, but don't know what voltage they work off of. Don't want to risk damaging it by applying 12 VDC until I know if this is too much voltage. Can anyone tell me the voltage they work off of? Also want to check for volts DC at the plug, but don't know what I am looking for. Vehicle is 1988 Quad, standard Jetronic fuel injection. Thanks in advance, Robert Hill in Memphis TN. If you don't mind, please reply to my personal email [email protected]

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Robert
various Alfa Romeo Spiders, current 1988 Quad (Red)
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post #2 of 9 (permalink) Old 10-20-2018, 07:29 AM
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They are 12V. The Cold Start System is stand-alone - not under computer control. The Thermo Time Switch will vary the length of time the Cold Start Injector squirts - from a few seconds to not at all - based on the coolant temperature.

Also see the link in my signature to the L-jetronic Spider Diagnosis page.

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- -~ 1981 GTV-6 ~
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post #3 of 9 (permalink) Old 10-20-2018, 09:06 AM Thread Starter
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Thank you, Eric. Great info as always, as I recall. Can you tell me where the thermo switch is located on the engine? Also, based on your experience, what component would be the most likely source of failure in a non working cold start injector situation? The thermo switch or the cold start injector itself? Thanks in advance, Robert
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post #4 of 9 (permalink) Old 10-20-2018, 10:09 AM
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Quote:
Originally Posted by vf31rhill View Post
...based on your experience, what component would be the most likely source of failure...?
The last item you test &/or replace.

TTS = Thermo Time Switch
CTS = Coolant Temp Sensor (which is not the dash gauge sender)
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- -~ 1981 GTV-6 ~
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Last edited by ghnl; 10-20-2018 at 10:12 AM.
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post #5 of 9 (permalink) Old 10-23-2018, 07:53 PM
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Welcome back! Hope health concerns are behind you and you can get some nice fall driving in!

[FONT="Microsoft Sans Serif"]Don - 1984 Spider Veloce[/FONT]
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post #6 of 9 (permalink) Old 10-23-2018, 08:30 PM
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Depending upon how long the car sat, the most likely culprits are:

Plugged injectors
Fuel pump(s)
Fuel filter

Least likely
Cold start valve. But not impossible

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #7 of 9 (permalink) Old 10-24-2018, 05:55 AM
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Glad to see you are back Robert!

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Rick

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post #8 of 9 (permalink) Old 10-24-2018, 06:26 AM
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Glad to see you are back Robert!
+1

Ed Prytherch
79 Spider
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #9 of 9 (permalink) Old 10-24-2018, 07:42 AM
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ďDry testedĒ

Does this mean you pulled it out of its hole, held it up in the air, and watched while someone cranked the engine?

Itís been over a decade since I sold my 86, but I think the CSS has one wire to it, meaning it must be touching something to provide a ground connection.

Meanwhile, if it had sprayed fuel around the engine bay while cranking, it could have gotten exciting.

Also, the trigger voltage to the CSS happens only while cranking the starter AND the engine is cold. The thermo time switch controls itís ooeration with respect to both temp, and how long itís allowed to operate. Iíve seen more TTS failures than CSS.


Quote:
Originally Posted by vf31rhill View Post
Hello All. It has been a long time. I have dropped off due to ongoing health problems. Got the 88 Quad (red of course) out of storage after changing out old fuel. Hard to start. I suspected cold start injector and dry tested it out of the intake manifold. Not working. I want to test it off the car to see if it is working or not, but don't know what voltage they work off of. Don't want to risk damaging it by applying 12 VDC until I know if this is too much voltage. Can anyone tell me the voltage they work off of? Also want to check for volts DC at the plug, but don't know what I am looking for. Vehicle is 1988 Quad, standard Jetronic fuel injection. Thanks in advance, Robert Hill in Memphis TN. If you don't mind, please reply to my personal email [email protected]

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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