My 73.5 engine keeps cutting out while driving. Mostly when I stop at a light to idle or when I accelerate. It doesn’t feel like lack of fuel pressure. It seems to cut out around 2000 RPM when accelerating. I cleaned all the grounds and contacts and replaced the CDI. Other than the random stalls the engine runs fine and starts right up.
How can I know if it is fuel or electrical?
Do electronics exist that can detect and record an electrical cut out?
Ideas?
Thank you.
It doesn’t sputter. It is A rapid cut out and just for a split second then right back to power. Like someone flipped a on/off switch off/on.
You might want to check the point gap. What ignition coil do you have?
Early S Registry member #90
R Gruppe member #138
Fort Worth Tx.
Yes! I will check this and report back.
on a 914, fuel injection, they have this electronic throttle position sensor...it gets worn out....a little metal finger wears a groove in the some spot over and over, on the electronics board, and it causes a "cut out" or flat spot. (it just happens to be around 3,000 rpm...because that's where its sits as your driving along)
maybe the CIS 2.4 has a similar thing?
and here is a link to a pdf of a Fuel injection manual.
http://www.type17.ch/downloads/Injec...p%20Manual.pdf
which has a troubleshooting chart on page 10
Last edited by Scott A; 11-21-2019 at 12:49 PM.
Current long term ownership: 63 Cab, 71 911, 74 914
Scott, the throttle position valve on the 73.5 throttle body is purely mechanical. It has a cam inside that slightly leans the mixture at cruising speed. Nothing like shown in the 914 part. Doubtful it has anything to do with the problems.
As usual, Ed Mayo made a good suggestion on where to start. Failing ignition coil, bad points gap or pitting is a good place to start.
Along those lines, when was the last thorough tune up? Is the distributor in good shape. Many have been neglected. Any play in the shaft, do the advance weights move, are the distributor cap and rotor in good shape. The points rubbing block should also be greased occasionally to reduce wear, along with a couple drops of oil on the felt pad in the shaft.
E Sully
1973.5 911T
Edmayo,
Scott A
E Sully,
Thank you for this. Great info. Will check these things.
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