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10-30-2006, 07:37 PM | #1 |
Registered Member
Join Date: Oct 2006
Posts: 4
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Surging When Warm A9L Upgrade
Hello All! I am working with an 87 gt hatch. all bolt on upgrades..
BBK equal length headers, hi flow (no cat) H-pipe, flowmasters stock motor, heads etc.... i did the mass air upgrade, and ever since when it is cold it runs like a dream. 10 minutes later, (or when i believe it is warmed up) it runs like balls. I just tuned it up with msd wires, platinum plugs, msd cap and rotor, set timing, and replaced the coolant sensor. nothing seems to solve it. any suggestions? O2 sensors? I was told to pull the pin on the distributor (that you disconnect when you set timing.) Bad Comp? It is the a9l computer. i have even removed the battery.....and then reconnected and ran it. Any help is greatly appreciated |
10-30-2006, 07:39 PM | #2 |
Factoy Five Roadster
Join Date: May 2000
Location: Sevier Co,Tennessee
Posts: 1,681
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Re: Surging When Warm A9L Upgrade
Check for codes.
Also check the TPS voltage.
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Frank |
10-30-2006, 07:41 PM | #3 |
Registered Member
Join Date: Oct 2006
Posts: 4
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Re: Surging When Warm A9L Upgrade
What is the correct TPS voltage at idle for the A9l comp? I was foolin with that but never did put my voltmeter on it
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10-30-2006, 10:21 PM | #4 |
Registered Member
Join Date: Aug 2006
Location: Yankton SD
Posts: 27
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Re: Surging When Warm A9L Upgrade
Your throttle body and/or idle air control could be dirty. Maybe wierd coincidence?
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10-31-2006, 08:02 AM | #5 |
Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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Re: Surging When Warm A9L Upgrade
Its either lean or has too much timing at idle.
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Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
10-31-2006, 03:16 PM | #6 |
Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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Re: Surging When Warm A9L Upgrade
Mine used to do the same thing and it was the O2 sensors. After they would warm up and kick in the car would surge.
I changed them and it was all good. Good luck,
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
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