91 Fox tuning issue..need help.. - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 09-27-2011, 03:54 PM Thread Starter
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91 Fox tuning issue..need help..

91 trunk Dart 347 Comp block Dart Pro 1 heads YSI Vortec s/c, Aeromotive fuel system, 60lbs inj. Car was tuned before with 306 different heads, s/c was the same inj. was the same. Basically everything was the same on the car except heads and new block. The problem is that at 10 degrees timing the car idles at 1500-1800 rpm. There are no vacuum leaks..throttle cable is not stuck, tps set at .98..I was hoping to be able to drive the car before it goes back to the tuner to break in new clutch. Can you give me any ideas?


91 Coupe Dart 347 YSI fogger
85 GT 408 8.58 167mph
2004 Lightning 12k 450rwhp
2008 Acura MDX AWD Helion TT 10.44
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post #2 of 4 Old 10-03-2011, 03:15 PM
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what kind of EMS have you got? i would say though, from what ive seen the timing needs should be substantially different beteeen the two motors (306-347).


replaced the 93'ish coupe with a 76 F100, 393, 11.5:1, TEA CNC 205 TW's, custom Hyd Roller, Super Vic, 830 HP, AOD, Edge custom conv., Silverfox SPT-MAC-TB.
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post #3 of 4 Old 10-03-2011, 11:52 PM
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need to verify TDC with zero mark on the balancer and then recheck base timing. I am assuming you are using the Ford EEC and a chip ?
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post #4 of 4 Old 10-05-2011, 12:00 PM Thread Starter
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yep Balancer is right,

91 Coupe Dart 347 YSI fogger
85 GT 408 8.58 167mph
2004 Lightning 12k 450rwhp
2008 Acura MDX AWD Helion TT 10.44
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