![]() It is clear to me that by trial and error one can tune the air bypass without the need for the expensive Ford kit. After so many years of catching it with the accelerator it is darned hard to leave my foot off it. After maybe 50 starts in the last few days, it only died twice. This gave enough bypass to noticeably raise the idle speed and almost eliminate the dying. I had some 0.030" gasket material so I made my own with the same 1/2" cut out. I decided that more improvement could be had if I had a thicker gasket, because the original IAC gasket was very thin (0.018"). I wonder if the heat soak is fooling the ETC into thinking the engine is warmer than it really is. Now it's worst situation seems to be when it has been shut down for a half hour or so, and restarted. It would never die when cold as the IAC would keep the idle speed up, and it never died at stop lights. It would rev up and then drop the idle so low it would die unless I would catch the idle with the accelerator. For most of my trucks life it has been dying when it was started hot. I noticed an immediate improvement in the engines starting behavior, but it would still die occasionally. I cut away the center of the original IAC gasket from the outside of each hole to the outside of the other hole, giving about 1/2" gap for the air to pass through. Idle Speed Adjustment in Idle Air Control (IAC) Sludge Poor Idle TSB 91-25-07 for 85-92 Bronco & F Series & many others ".I have spent some time this week trying to set up an air bypass around the IAC valve by cutting away some of the gasket between the IAC in and out air holes, rather than pay big bucks for Fords spacer kit. Idle Speed Check & Adjustment Source: by Steve83 (Steve, That dirty old truck) at Refer to these charts to see if the service kit is to be installed and which service cleaning procedure, if any, is to be used." by Ford via Steve83 (Steve, That dirty old truck) at Idle Speed Adjustment in Idle Air Control (IAC) Sludge Poor Idle TSB 91-25-07 for 85-92 Bronco & F Series & many others ".Detailed application charts for throttle body and idle air by-pass solenoid service procedures by engine VIN #/engine displacement/vehicle application and model year are shown. I think you may end up w/headaches tring to re-set that scew so a yard throttle body may be an option dowen da road.īUT, maybe you and dad can go thru this and get er done. ![]()
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