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Join Date: Oct 2004
Posts: 5
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Cold Starting a 73.5 with CIS
A simple question. What is the proper procedure for cold starting a 73.5 with CIS? I was reading the owners manual and it says to just use the hand throttle. I lift up the handle throttle and engage the starter and the engine kind of sputters and limps along, but to keep it running I need to start pumping the gas. What is the "right" way to start it when everything is in proper order? I understand that I should not pump the gas pedal prior to starting, right?
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10-14-2004, 02:16 PM
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Join Date: Feb 2002
Posts: 344
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The owners manual is right of course. In a CIS system the gas pedal is not connected to anything in the fuel system so you can pump it for half an hour before you start and it won't make any difference. Once it starts just keep it running by using hand or foot throttle.
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10-14-2004, 02:53 PM
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Thanks, Hladun. How does the hand throttle work? Does it effectively keep injecting fuel so long as it is up. I'm not very technical (can you tell?), but I was just wondering.
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10-14-2004, 03:16 PM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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Having restored a 1973.5T from the sheet metal outward I can report that the hand throttle and gas pedal share exactly the same linkage and in a properly working system one can see the pedal depress when the hand throttle is lifted. The throttle moves a vane in the throttle body which controls the air flow which is how these systems work. The fuel is metered mainly through the meter in the top of the air box ( to the rear of the filter element). There is no gas supplied until the engine is cranking and air begins being inducted into the engine (not even through the cold start valve as it's wired into the starter circuit). This is what Hladun means. If nothing appears to be happening when you pull the throttle lever I suspect a broken or loose plastic fitting that connects the hand throttle to the horizontal thottle linkage rod that runs through the tunnel to the rear of the car. In a 73.5T CIS system the hand throttle should be pulled all the way up when starting even if the engine is warm. In a properly adjusted system pulling the lever all the way up closes a microswitch (on the throttle body) which enables the cold start valve (CSV) to enrich the mixture for easier starting. The CSV only operates while the starter is engaged. Once the car starts the hand throttle is adjusted downward to get an acceptable warm-up idle (1500 to 2000 rpm). After the engine is warmed then the throttle lever is pushed all the way down and the air bleed around the throttle vane principally (there are a couple of other components that effect it some also) controls the idle speed. Cheers, Jim
Last edited by Jim Sims; 10-14-2004 at 03:21 PM.. |
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10-14-2004, 03:16 PM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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Last edited by Jim Sims; 10-14-2004 at 03:28 PM.. |
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10-14-2004, 03:23 PM
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Thanks, Jim, for the explanation and links. Very informative. I went out and looked at the car. Pulling up the hand throttle all the way does nothing to the pedal. Sounds like something is wrong with the linkage. I'm going to have it looked at on Monday.
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10-14-2004, 03:53 PM
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