Engine only runs when starter is engaged - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 39 (permalink) Old 04-04-2019, 11:37 AM Thread Starter
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Originally Posted by Alfajay View Post
But something still has me puzzled: If the FCS microswitch was disconnected, how did the Spica pump know when the ignition key was turned from "start" back to "run"?
I'm a bit baffled as well. It's not like I'm new to spica either. My 74 still has it. I'm going to read through the FI manual from Wes and see if it elaborates anymore on the starting circuit.

Alfa69GTV1750, I'm probably going to have to pull the FCS to verify that everything is as it should be. Just waiting on the tool.

I'm waiting on a few parts to arrive so I've been cleaning electrical connections here and there. Haven't seen a clean connection yet. Part of the fun of a new to you car. I came across this loose braided wire. Does anyone know what this connects to? Name:  IMG_20190404_102545.jpg
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post #32 of 39 (permalink) Old 04-04-2019, 05:16 PM
Del
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Don't remember about the braided wire (maybe a temperature probe wire from the cat? Our 78 GT had one), but bypass that inertia cutoff switch. Just hook the two wires together. That thing was a pain in the neck on our cars which had it. Every time we hit a bump... the engine shut off.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

Last edited by Del; 04-04-2019 at 05:19 PM.
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post #33 of 39 (permalink) Old 04-04-2019, 07:39 PM
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What does the inertia switch turn off?

Might the starter bypass it and it is causing the problems? If it turns off the fuel pump, which I assume it does, that might be the problem.


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Don't remember about the braided wire (maybe a temperature probe wire from the cat? Our 78 GT had one), but bypass that inertia cutoff switch. Just hook the two wires together. That thing was a pain in the neck on our cars which had it. Every time we hit a bump... the engine shut off.

Mike
1969 GTV 1750
1966 Super
San Diego, CA

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post #34 of 39 (permalink) Old 04-04-2019, 08:09 PM
Del
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Didn't look into it, just bypassed it after several occurrences of the engines quitting in the middle of intersections, etc. I think it is suppose to shut off the fuel pump. Engine does quit almost at once though, so it also might be the ignition. Others will know better. I do not remember any longer. Been a long time since our Alfettas.

Just bypass that sucker is my advice, regardless.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #35 of 39 (permalink) Old 04-05-2019, 06:47 AM Thread Starter
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Thanks Del, that might be it as it snakes down under the car. The cat is long gone now though. That might be why it's disconnected.


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Originally Posted by Alfa69GTV1750 View Post
Might the starter bypass it and it is causing the problems? If it turns off the fuel pump, which I assume it does, that might be the problem.
That was the first thing I checked. I wish it was that simple. There's some questionable wiring from the po that I discovered so I'm dealing with that until my parts arrive. Unfortunately the manual I have is for non US Alfas. If anyone has a color wiring diagram I'd greatly appreciate it. I was super bummed to find out about Papajam.
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post #36 of 39 (permalink) Old 04-05-2019, 07:40 AM
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A diagram and some thoughts.
The car should start but not accelerate without the fuel pump on. Mine does.
The braided cable is the "RUN YOUR CATALYTIC CONVERTER IS ABOUT TO MELT" system. Appropriate in the 1970s. Probably not connected to anything now.
The thing with the plunger on the passenger side firewall is the "darn my Alfetta has rolled over and please turn off the fuel pump" thing. It fails in the no power to the fuel pump. Mine has failed and I jumped the wired together. Gotta get a new one from Summit Racing.

Trivia: The CAT melting cable leads to a weird electronic board tucked up in the passenger side above the glovebox. Looks like a Radio Shack science project. It then leads to the "SLOW DOWN" dash light. Alfa trainers called it the "popsicle" back in the day.
AlfaJay and I and about 15 others are loading up our Alfas and heading up to Central Calif for our AROSC Wine Tour. If you get any posts from either of us later tonight just ignore them as they may be "wine influenced". Or maybe our thoughts could be more clear as they would be unencumbered with reason.

RIP PapaJam. Thanks for the help.
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Paul Blankenship AROSC
76 Alfetta GT -Track and daily driver; 88 Milano - a continuing project
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post #37 of 39 (permalink) Old 04-05-2019, 09:55 AM
Del
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Wasn't implying that the inertia cutoff switch was the cause of your problem, was just suggesting that you bypass it, just because it can bite you at inopportune times, as we found out. It's not worth having it if you get stuck in the middle of traffic with the fuel pump shut off as happened to us a few times.

Good luck with your problem. You will get it solved. My mechanic had a Marelli(?) tester, which might find such a problem as yours. Pretty sure he used it on our 78 Alfetta sedan when we had some sort of similar problem. Don't remember what it was though. I remember his showing us the tester, saying that it did come in handy now and then. Don't know if anyone in your area has one. Evidently quite rare.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

Last edited by Del; 04-05-2019 at 12:16 PM.
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post #38 of 39 (permalink) Old 04-05-2019, 02:32 PM Thread Starter
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Originally Posted by sidewaysalfa View Post

Trivia: The CAT melting cable leads to a weird electronic board tucked up in the passenger side above the glovebox. Looks like a Radio Shack science project. It then leads to the "SLOW DOWN" dash light. Alfa trainers called it the "popsicle" back in the day.
I was wondering what that board with the single fuse was for. Thank you for the diagram! So much easier to read. And the Alfa wine tour sounds like a blast


Del, yeah I probably will just bypass the switch. Seems like a lot of people have had problems with it.
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post #39 of 39 (permalink) Old 04-17-2019, 06:56 PM Thread Starter
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Update

I got her running! It ended up being the thermostatic actuator. It was stuck in an extended position. The set screw was out of wack as well. I need to go over system as the lower rod is keeping the throttle from completely closing. Along with a few other things.

I want to say thanks to all of the people who helped out. I learned a lot.
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