Does this thing have a roll-over shut off switch?

Gotta love that wiring . . .
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paintdudeluke

Does this thing have a roll-over shut off switch?

Post by paintdudeluke »

I'm racking my brain trying to isolate a stalling problem when I corner hard.

Already has: new coil, new (behind coil) ignition module, new fuel filter, clean tank.

I can't figure it out. checked grounds, lots of fuel flow, does it even when tank is topped off with fuel.

If it sits for 10 minutes it runs great for a few minutes. Nearly dies on hard left turns.

I'm a great mechanic ( toot toot ) but I'm really stumped now.
djape1977
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Your car is a: 1970 fiat 124bc
Location: Belgrade, Serbia, eastern Europe

Re: Does this thing have a roll-over shut off switch?

Post by djape1977 »

electric problem. my brothers mazda mx6 had same problem, turned out to be wiring between distributor and ECU
GeorgeT
Posts: 379
Joined: Thu Feb 16, 2012 12:41 pm
Your car is a: 1982 Fiat 124 Spider

Re: Does this thing have a roll-over shut off switch?

Post by GeorgeT »

F.I. or carbed? If carbed, could there be an issue with the float?
paintdudeluke

Re: Does this thing have a roll-over shut off switch?

Post by paintdudeluke »

The fuel injectors are clean, the filter is new, the tank has been flushed, and return line has tons of volume and pressure. I keep thinking that fuel can be the only explanation as to why it almost dies after a hard left turn but it does it even with a full tank. I can't think of many problems that display this symptom. It runs perfect if you keep it under 1/4 throttle all the time, but under heavy load (with maneuvering) or a hard turn its craps out if into the throttle at all. What component could be sensitive to "g force" during turns but otherwise be fine? And even at that its only sometimes, at times it runs awesome with no issue at all.
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aj81spider
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Your car is a: 1974 Fiat 124 Spider
Location: Chelmsford, MA

Re: Does this thing have a roll-over shut off switch?

Post by aj81spider »

Not saying it's your problem, but I had a problem where the car would intermittently lose power and surge after it had been running about 30 minutes - and only at highway speeds. Ultimately I found it by accident. It was a crack in the air hose from the AFM to the intake. You might want to check for air leaks. You could have a cracked hose that only flexes open under certain conditions.
A.J.

1974 Fiat 124 Spider
2006 Corvette
1981 Spider 2000 (sold 2013 - never should have sold that car)
paintdudeluke

Re: Does this thing have a roll-over shut off switch?

Post by paintdudeluke »

I thought of that. I sprayed the entire intake route with starting fluid trying to locate a leak but it never even noticed the ether sitting at an idle. It could be leaking under flex. In my imagination this could be exactly how it acts, if it leaned way out it would be starving for fuel. Might also explain the hot/cold behavior differentiation. I'll have to reinspect that with the entire thing removed. Adjacent hoses as well I suppose.
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81SPIDERMATT
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Joined: Mon Oct 11, 2010 5:10 pm
Your car is a: 1981 spider 2000
Location: FORT COLLINS, CO

Re: Does this thing have a roll-over shut off switch?

Post by 81SPIDERMATT »

as soon as you said hot cold differences it made me remember grounding issues I was having.... when cold things worked when warm things did not... fuel pump ground ended up being suspect number 1 .... in my mind the cold metal made a better ground than the warm metal did .... just a thought.... maybe a ground is loose and gets looser on tourqey turns
paintdudeluke

Re: Does this thing have a roll-over shut off switch?

Post by paintdudeluke »

Just closure to the thread.
One day after a refill and a can of heat it just started running great. No explanation. I suspect it was a bolus of water in the very bottom near the pick up tube that flushed through the fuel rail on a corner and then dumped back into the tank, finally it all dissolved into the fuel, was consumed, and by the next fill up it was fixed. Of course that's just my theory in retrospect, in my imagination, derived from a fantastic voyage of extrapolation....who knows? But it runs great for the last 3 weeks. :)
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