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10-11-2004, 10:00 PM
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#1 | |
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AF Newbie
Join Date: Jul 2004
Location: Dallas, Texas
Posts: 10
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Engine surge on start
I've got a 93 Gt with a built 302. Here are some of the performance parts:
Tremec 3550 5 speed tranny Trick Flow stage II Ports twisted wedge heads flow .311 intake side 2.02/1.60 Gt 40 Intake fully ported to heads Felpro 1262 gasket Eagle H-beam rods JE Pistons cut for the Trick flow heads B-cam 1.6 Comp cams Pro magnum Roller rockers 75mm Bullet Pro-M mass air for 30lb 30lb motorsport injectors 70mm Edelbrock/BBK throttlebody mac short tube headers Mac off road h-pipe 2 chamber flows Heres the problem. When I start the car up it will surge from 1000 to 1500 and it gradually stops surging into a normal idle. A friend said it could be the computer adjusting to all of the performance parts and I may need a custom chip burned. Has anyone had this problem or possibly know what it could be? I had the MAF re-calibrated and had the TB checked. Any help appreciated. |
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10-11-2004, 10:49 PM
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#2 | |
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AF Enthusiast
 Join Date: Oct 2003
Location: Anywhere, California
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Re: Engine surge on start
I agree with your friend, your 5.0 is flowing at a much higher CFM than it did with the factory programming. It's either the factory programming or the Idle Air Control Valve is overly-eager. Have you reset the computer?
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10-12-2004, 02:34 PM
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#3 | |
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AF Newbie
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Re: Engine surge on start
Yes, I've reset it a couple of times recently. It didnt get rid of the problem though.
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10-15-2004, 07:27 AM
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#4 | |
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Stanger
 
Join Date: Dec 2001
Location: Hampden, Massachusetts
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Re: Engine surge on start
My car use to do that a lot, and I took a few steps that seemed to solve the problem.
-Made sure the TPS was set to .98 volts -Cleaned the IAC as well as the MAF sensor -Bought and air idle bypass plate, (goes between the TB and IAC) -removed small vacuum cap on the vacuum T of the firewall. This got rid of an surging I had, put cap back on and it surges, take cap off and no surge. -Then adjusted the idle to 800 rpms with the IAC unplugged and let idle for a few minutes before plugging back in. -Dissconnect the battery for 20 minutes and reset the computer followin the reset method That was just a brief description of what I did, hope it helped some.
__________________
[size=1]-1950 Ford Custom, flathead V8
-2013 Ford Flex -1999 Ford F150 |
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10-15-2004, 10:52 AM
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#5 | |
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AF Newbie
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Re: Engine surge on start
thanks for the help, I'll have to try those methods out.
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10-17-2004, 11:58 AM
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#6 | ||
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AF Enthusiast
Join Date: Oct 2003
Location: Anywhere, California
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Re: Re: Engine surge on start
Quote:
http://www.allfordmustangs.com/Detailed/581.shtml It describes setting the TPS. Hey HiFlow, You should try to contact Jay Leno and see if he needs an on-site Automotive Engineer.  |
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