Who doesn't love a good GT40 idling issue? |
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man0seven
Senior Member Joined: September-16-2018 Location: Utah Status: Offline Points: 122 |
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Posted: July-09-2019 at 2:51am |
Problem:
Starts fine, idles high(1200-1500) for a 15 seconds or so and eventually comes down to 800-900 rpms. After idle down it searches for a steady idle(rolls). This happens when it is cold, it happens when it starts to warm up and happens when warm. It does however after a few minutes it lowers in idle and then idles between 680 and 950. Also, any time you go above idle it again takes time for it to idle down and then rolls. While I know that a rolling idle is not an uncommon thing, it is so persistent that it makes it very difficult to drive because with all the starting and stopping you are constantly dealing with a 1100 rpm. Attempts: I have replaced almost everything at some point for other issues and trying to sort out the idling issues. I'll list all parts replaced even though I know some of them are not related. Cleaned throttle body and checked for any hold up with valve and throttle arm checked for vacuum leaks with starter fluid Removed tank and cleared and cleaned all valves and hoses(besides supply line and return line) Replaced: Low pressure fuel pump FCC fuel filter Injectors fuel line between LPFP and FCC High pressure fuel pump Fuel pressure regulator Idle air control valve Spark plugs SP wires TPS MAP sensor vacuum line from map sensor to throttle body ACT sensor ECT sensor PCV valve and finally the ECM(might still be the issue, bought used on Ebay) I have read through almost all the threads on the GT40 but I cannot figure out what is wrong and what to try next. B |
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2005 Ski Nautique
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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How is your distributor cap and rotor? Pip sensor? Connector corrosion in multi pin connector to ECM?
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10648 |
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If you go to the link below, Joe seems to have solved his idling issue with an adjustable fuel pressure regulator. You mention that yours has been replaced but was it with an adjustable one?
Compared to the cost of that laundry list of parts that you've replaced, it's a drop in the bucket cost wise (and it sure is pretty looking) It may or may not solve your issues, but you won't know till you try link |
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man0seven
Senior Member Joined: September-16-2018 Location: Utah Status: Offline Points: 122 |
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I got the sexy looking regulator and installed it. Besides it looking better, it is still having the same issues. One thing that is interesting is that when I increase the pressure the lopping increases in speed. I ran the pressure from anywhere between 30 and 50 and it never went away. Any other thoughts?
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2005 Ski Nautique
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10648 |
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Well at least you tried |
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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When you removed and cleaned the throttle body, did you replace the gaskets as well? If so, do you mind providing the source you ordered the gaskets from?
Thank you! |
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man0seven
Senior Member Joined: September-16-2018 Location: Utah Status: Offline Points: 122 |
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I did not replace the gaskets because they seemed in good condition. However, you can find them at skidim. Intake Gasket |
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2005 Ski Nautique
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10648 |
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