Drilling a hole in the body plate..to cure SURGE - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 11 Old 05-17-2017, 07:17 PM Thread Starter
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Drilling a hole in the body plate..to cure SURGE

I have heard from a couple of people that drilling a small dia hole in the throttle body plate will help cure idle surging.. Is there any TRUTH to this? If so, what dia and where do you drill it?


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post #2 of 11 Old 05-17-2017, 07:25 PM
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I have heard from a couple of people that drilling a small dia hole in the throttle body plate will help cure idle surging.. Is there any TRUTH to this? If so, what dia and where do you drill it?
Is the car tuned?

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post #3 of 11 Old 05-17-2017, 07:38 PM Thread Starter
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Basically a stock 93 5.0 with Cobra intake, Cobra EEC, Cobra injectors and Cobra mass air.. E cam and full exhaust.. no other mods.. NO TUNE

2012 BOSS 302 Laguna Seca w/boost
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post #4 of 11 Old 05-18-2017, 12:41 PM
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Originally Posted by ulev1st View Post
I have heard from a couple of people that drilling a small dia hole in the throttle body plate will help cure idle surging.. Is there any TRUTH to this? If so, what dia and where do you drill it?
No. Drilling a hole is no different than adjusting the throttle stop.
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post #5 of 11 Old 05-18-2017, 12:43 PM
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Ford used to sell a plate with an adjustable orifice in it to dial out some surge. I haven't seen them in years, but they exist.

Was called an Idle Bypass Plate

idel bypass plate(for surge fix)..who uses it?

Buy one new.

https://lmr.com/item/LRS-9939A/1986-...l-Iac-Adjuster
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post #6 of 11 Old 05-18-2017, 01:31 PM
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Surging is caused by 2 things. Vacuum leaks and wrong injector flow rate. Check for leaks with a smoke test. Check fuel pressure. 39-40 with vacuum off.

Idle plate might help by raising idle to mask the real problem. Don't touch the throttle screw to raise the idle, you will only cause more headaches.

The hole in the throttle plate is a trick to allow more air into the engine to stop it from stalling when coming to a stop.

Start with vacuum leaks. Definitely use a smoke test.
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post #7 of 11 Old 05-18-2017, 01:32 PM
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What throttle body are you using? All throttle bodies are not the same...
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post #8 of 11 Old 05-18-2017, 03:40 PM
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if the air a tb flows is not the same as programmed in the ecm

surging can happen
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post #9 of 11 Old 05-18-2017, 06:31 PM
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You need to tune the bloody thing properly.
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post #10 of 11 Old 05-18-2017, 06:36 PM
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You need to tune the bloody thing properly.
^^^
What he said.

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post #11 of 11 Old 05-18-2017, 07:27 PM
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Your tune or TB is set up wrong or you have a vacuum leak. Don't drill holes. Drilling a hole is no different than resetting the throttle closed stop except you can't adjust it or undo it. It's dumb advice.
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