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Old 12-18-2011, 03:57 PM
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305 TPI help

I have a 1986 305 TPI with a 700R4 tansmissin in my 1950 Ford Truck. it has developed a strange problem. Starts and idles fine after you drive sometimes when you stop it idles up very high only when in gear, will idle normal in netural. Replaced IAC and TPS seemed better on test drive but when I got home idled fine in drive untill you stop and roll and stop again it will go into a high idle??? any ideas

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Old 12-18-2011, 06:34 PM
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After idling high, does it go back down if you put it back into neutral or park, or stay high?
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Old 12-18-2011, 07:18 PM
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Sounds like an air leak, like a bad PCV valve or intake manifold Leak.Maybe the EGR is hanging open. Also the vacuum to the MAP sensor is critical.The Throttle body base gaskets are problematic, sometimes the gasket burns away exposing some of the passages under the T body to unwanted vacuum signals, which can mess up the vacuum to the MAP sensor.
If you have put in a cam or changed anything performance wise, then you may need to do a Minimum Air Rate adjustment.
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Old 12-19-2011, 03:20 AM
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Thanks for info. I will recheck for vac leaks. Why would this high idle only happen when at a stop in gear. Is there anything with transmission that controls idle. Could I have a ECM going bad. Thanks for replys
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Old 12-19-2011, 08:32 AM
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Other than converter lockup, the ECM should be pretty "gear ignorant" I believe.
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Old 12-19-2011, 10:00 AM
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Thanks. I am going to recheck the IAC. Problem is intermittent
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Old 12-19-2011, 10:35 AM
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How about the TV cable hanging up and holding the throttle open?
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Old 12-19-2011, 01:41 PM
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That's what I was thinking too.
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Old 12-19-2011, 05:04 PM
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TV cable is a possibility, could be a flaky IAC too. Even a worn throttle shaft bushing could be a possibility
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Old 12-19-2011, 08:04 PM
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Need to be able to look under the hood when its revving and see if the throttle is stuck open at all.
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Old 06-14-2013, 12:44 AM
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I've noticed if the tps on these tpi's go bad they tend to run real rich and idle high did you set your voltage after installing the tps also the mechanical setting for the idle me need done also if you need some guidance on setting those I got a serious education when i did my tpi swap in my 85 monte!
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Old 06-22-2013, 05:48 PM
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It sounds like a vac leak, but I would also check the TPS. They are a known problem component. If you have a scope, try sweeping the unit to see if there is a bad spot.
Also as was suggested before, try doing a min air reset of the throttle blades. In "park", unplug IAC, adjust the throttle blades to set rpm. I think it was like 400 or 600 RPM? Hopefully someone can find that spec for you.

Hung up Torque converter lock up would bog the motor down. As would a sticky TV cable.
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