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GT40 part throttle surge Printed From: CorrectCraftFan.com Category: Repairs and Maintenance Forum Name: Engine Repair Forum Discription: Engine problems and solutions URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=1862 Printed Date: November-22-2024 at 8:30pm Topic: GT40 part throttle surge Posted By: Guests Subject: GT40 part throttle surge Date Posted: June-12-2005 at 2:27am The GT40 engine on my 96 SN has a problem I can't seem to nail down. It idles fine and runs great at WOT but from 1200 to 1800 rpm the engine surges and the rpms fluctuate by about 200-300. I've ruled out vacuum leak and misfire. I was wondering if thats an IAC motor bolted to the side of the throttle body and if so could the Intake Air Control motor could be causing this or perhaps a bad fuel pressure regulator? Is there any way to test the IAC motor? I have'nt checked fuel pressure readings because it runs fine at WOT and seems more like an airflow problem. Any ideas would be appreciated. Replies: Posted By: nms1991 Date Posted: June-12-2005 at 11:05pm You have to t5he same way to test if it was off a Ford truck with the windsor motor and fuel injection. Do you have Perfect Pass on your boat?

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