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Author
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Topic: Cause of 93 Mustang motor surging?
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in4thewin24
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Member # 13648
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posted
 
 
I recently purchased my 93 Mustang Gt that has a 347 in it. I drove it around for a couple days without any issues. Then the motor started surging when at idle, also it dies when I put it in reverse. Today when driving it to work it started lunging a bit with surges (I need to bleed the brakes) and it is an automatic right now as well.
I replaced the Idler air control module since the previous owner siliconed the plug to the broken plug on the Idler control. I also put a new battery in since the one it had was crap.
Any ideas or has anyone had this happen to them?
Posts: 17 | From: Sacramento | Registered: Jun 2014
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LXjames
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Member # 10791
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posted
Did all this start after the battery change? If so you may have accidently fried the computer to an extent. Just a possibility
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On Point Motorsport prez.
King Lx
Posts: 4761 | From: Pittsburg CA | Registered: Mar 2011
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racsirx
CAFords OG
Member # 1710
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posted
What rpm is the idle at? What Cam?
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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in4thewin24
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Member # 13648
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posted
quote:
Originally posted by LXjames:
Did all this start after the battery change? If so you may have accidently fried the computer to an extent. Just a possibility
No I changed the battery after. I thought maybe there wasn't enough juice to keep everything going.
Posts: 17 | From: Sacramento | Registered: Jun 2014
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in4thewin24
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Member # 13648
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posted
quote:
Originally posted by racsirx:
What rpm is the idle at? What Cam?
Here is the sheet that the previous owner gave me about the cam.
[IMG]  [/IMG]
[ 2014-09-11, 01:07 PM: Message edited by: in4thewin24 ]
Posts: 17 | From: Sacramento | Registered: Jun 2014
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racsirx
CAFords OG
Member # 1710
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posted
What rpm are you idling at?
--------------------
88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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in4thewin24
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Member # 13648
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posted
quote:
Originally posted by racsirx:
What rpm are you idling at?
between 500-1000 gradual surge until starts to lunge a bit then 500-around 1300 once or twice then dies.
Posts: 17 | From: Sacramento | Registered: Jun 2014
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racsirx
CAFords OG
Member # 1710
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posted
See if you can turn up the idle and get it to stay at 1K RPM.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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fordfiveoh
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Member # 13107
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posted
I had the same problem on mine. Jon Duncan (Duncan Motors) had adjusted my tps sensor and adjusted the butterfly valve in the throttle body. Maybe start there so you can at least drive the car/hear it idle so you can figure it out a lil more if it persists.
Posts: 180 | From: Vallejo, CA | Registered: Aug 2013
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SacGrown89GT
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Member # 7435
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posted
I had same problem on mine. Set the tps voltage to like .98
After i did this my car runs great now.
Hopefully this helps you. Did to me
http://sbftech.com/index.php/topic,1031.0.html
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"Your shit aint hot!"
"No but its faster than your shoes"
"...."
Posts: 699 | From: SacGROWNmento | Registered: Feb 2007
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