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"Christine" does not like me

1714 Views 24 Replies 6 Participants Last post by  scooter111
1983 Seville, 4.1
I posted last month about an issue with her almost stalling and having to "bounce" on the gas pedal to keep her running while waiting for a construction crew to clear the road on my way back from a battery purchase. (Details in previous post) After checking codes, fuel pressure etc. I decided to replace the TPS and ISC motor as a precautionary measure. Well, let the fun begin! First of all, the idiot who installed the TPS over torqued one of the attachment screws and it broke flush with the base housing. So he glued it in! Everything has to come off the intake to remove the base so it can be drilled out and retapped. After 36 years the bolts for the attached parts are gaulded to the intake as are the various pipes etc attached to the fuel intake base. And trying to get to the mounting bolts and connecting tubing requires removing other sensors, also gaulded, along with the distributor. A real nightmare, I don't look forward to removing the intake manifold to drill out all of the twisted off bolts so in a flash of possibly unsophisticated thought, I am thinking to just fugetaboutit and remove the TPS and ISC motor completely. After all I can adjust the idle up or down with the throttle screw. Don't think it would be a big deal to do that, might set a code or two, but so what? The TPS and ISC are only idle control functions and seem, at least to me, to be add-on electronic gizmos that add nothing to the run-ability of the engine, just being idle control.

I am probably missing something in my reasoning, (trying to save a lot of additional work and aggravation) and would appreciate any input from anyone who has been faced with a similar situation. And,as an addendum, NO, the base cannot be drilled out while still in position on the car.
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Whoa. One step at a time, it's a pain right now but not impossible.

You can in theory operate without the ISC-it will make cold starting difficult and warm running wasteful, but it can run without it by adjusting the minimum air screw as you mention. But you're throwing the baby out with the bathwater by doing that.

However, It will not run worth a damn at any engine speed without the TPS installed. Without it moving in correspondence to the throttle the car will have no idea how much fuel to flow, advance to give, when to open the EGR, etc. etc. as you drive.

To remove the throttle body the only pieces of any concern are wrecking the fuel supply and return. Possibly the metal vacuum line which is also attached similarly. A set of line wrenches really pay for themselves with stuff like this and I suspect with a little penetrating oil you'll be good to go. Once they get loose you have the 3 (13mm?) bolts holding the assembly to the manifold. You may need a deep socket. I have NEVER come into one that was difficult to remove however. Then the two probably fossilized rubber hoses at the front and back of the throttle body and the whole assembly can be removed from the car and the repair made.
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