Engine wants to die when put into gear

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Re: Engine wants to die when put into gear

Post by jlwhitney35 » Tue Jun 11, 2019 4:53 pm

I can't say I was "familiar" with that switch either. I did notice it at one time, but could not find a reference to it.
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Re: Engine wants to die when put into gear

Post by bartigue » Wed Jun 12, 2019 5:19 am

The system is documented in the supplements in the library here on mirafiori.
Brad Artigue
1969, 1969, 1970, 1979, 1980, 1981, 1982, and 1982 124 Spiders
1969, 1970 850 Spiders
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Re: Engine wants to die when put into gear

Post by miker » Wed Jun 12, 2019 10:47 am

So was the problem that the switch was killing the power to the idle stop solenoid? That was my first guess, but no.

I looked at the diagram (it's also in the big shop manual, page 10-127. The switch on the clutch pedal is part of the EGR circuit, along with a "gear engaged" switch on the transmission. I think when the gear is engaged, but the clutch is in, or when a gear is not engaged, the EGR valve is closed, e.g., no EGR at idle. When the car is in gear and the clutch is out, EGR is allowed. If the EGR valve is stuck open, or if there is some electrical fault causing it to stick open, then you would have a vacuum leak at idle, killing the engine.

So by removing the switch, the EGR system never thinks the car is in gear.

Since you are in 'cheap and cheerful' mode on the car, you can slip a piece of shim stock (or a piece of aluminum can) between the fitting from the EGR pipe on the exhaust manifold and the place where it connects to the pipe fitting on the exhaust cam box to block it off. I bet that helps your everyday running too. Later, you can get special plugs from Autoricambi for getting rid of the whole shebang, making the car easier to work on.

Back in the day where emissions inspections were common, this was the best thing one could do for making a stock Spider run better.
MikeR (mirafiori.com since 1995)

1977 Fiat 124 Spider
Previously owned:
2012 Fiat 500 Prima Edizione #236 (now owned by my son David)
'86 Bertone X1/9
'81 Fiat Spider 2000 #236
'78 Fiat 131 four door
'76 Fiat 128 4 door
'74 Fiat 128 4 door
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