Throttle Lever

[911kid]

Hey guys need some help. I have a 73.5 T w/CIS and to get the car to idle( without dying) i have to leave the throttle 1/4 to 1/2 open or the car will die when the engine Rpm's drop. Is this a CO problem or a idle speed problem. When the lever is up however the car runs fine. Just would like to get it right thanks.

Hunter McCandless
78 Fj-40
73.5 T

[HarryD]

Originally posted by 911kid
Hey guys need some help. I have a 73.5 T w/CIS and to get the car to idle( without dying) i have to leave the throttle 1/4 to 1/2 open or the car will die when the engine Rpm's drop. Is this a CO problem or a idle speed problem. When the lever is up however the car runs fine. Just would like to get it right thanks.

Hunter McCandless
78 Fj-40
73.5 T

Hunter,

I had a similar problem. Afte a visit to my wrench, he found the car was running way rich. Once adjusted, runs like a dream.

Before you do that, check the rest of the things on the CIS Troubleshooting Chart .

[Sunroof]

If it dies at idle check the deceleration valve (line runs from bell shape housing behind airbox down toward the distibutor.

You can check the CO as well. Its a crude way, but what I did after my 73.5T would die after a run on the interstate on the off-ramp was to restart, pull over and begin adjusting the mixture til I had a good feel and balance and the idle stayed. The key to adjustment is to remember a left turn (clockwise) to Lean and right to rich. One click at a time. One issue I had that I will pass on is that the previous owner put locktite on the adjustment screw so I had to slowly work that away by removing the air filter and holding the sensor plate with one hand while I slightly forced the adjustment wrench into the screw and adjusted.

Good luck

Bob

[HarryD]

Bob,

Forgot about the decelleration valve. Mine was sticking and when my wrench adjusted the mixure, he plugged the vacuum line as well.

Thanks for the reminder.