1994 cobra poor idle quality, coil going bad? - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 03-10-2007 Thread Starter
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Question 1994 cobra poor idle quality, coil going bad?

i have a 94 cobra i just put a new cap, rotor, autolite Xp preformance plugs gaped at .55, 180 thermostat and a new rad cap, now the car idles rough, before it had a little miss but you could hardley notice it, sometimes the rpms wil go up and down from 800-900 then it will even out a little, any suggestions?

New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

1987 Mustang LX 5.0 5-speed,white with smoke grey interior,MAF conversion,Perfection clutch(valeo)2.5inch Ravin exhaust, subframe connectors, ported lower intake & heads=SOLD
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post #2 of 9 (permalink) Old 03-10-2007
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ha!!! welcome to my world.

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post #3 of 9 (permalink) Old 03-10-2007
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my car wont start I also have a brand new cap and rotor from MSD and the blaster coil ignition and its not making spark, plus the damn IAC is also making the idle very wierd, but try to buy it from FORD for only 166$

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post #4 of 9 (permalink) Old 03-13-2007 Thread Starter
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could it be the coil?, is there any way to test the coil, also i just bought a MSD blaster coil for my truck(94' 460ci efi) could i hook it up to my cobra and then see if the coil is the problem?

New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

1987 Mustang LX 5.0 5-speed,white with smoke grey interior,MAF conversion,Perfection clutch(valeo)2.5inch Ravin exhaust, subframe connectors, ported lower intake & heads=SOLD
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post #5 of 9 (permalink) Old 03-13-2007
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From my knowledge im thinking bad coils only really effect starting conditions and if you have no start conditions it might also be a ignition module or the stator inside the distributor.. as far as idle surging i bought one of those iac spacer for my 94 cobra and it idles great with a aftermarket cam in it. no surging
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post #6 of 9 (permalink) Old 03-17-2007
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Have you checked the TPS voltage reading? It should be .98 volt. Recently I upped the idle and it threw out my TPS setting.
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post #7 of 9 (permalink) Old 03-17-2007 Thread Starter
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yes i put it at .987, still no change, do you think it could be the balancer?im begining to think it could be, but still the idle isnt steady

New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

1987 Mustang LX 5.0 5-speed,white with smoke grey interior,MAF conversion,Perfection clutch(valeo)2.5inch Ravin exhaust, subframe connectors, ported lower intake & heads=SOLD
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post #8 of 9 (permalink) Old 03-17-2007
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Try and check the Ignition Control Module, and possibly even the distributor...
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post #9 of 9 (permalink) Old 03-17-2007 Thread Starter
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how can i check the ignition control module? i put a new rotor and cap on the distributor

New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

1987 Mustang LX 5.0 5-speed,white with smoke grey interior,MAF conversion,Perfection clutch(valeo)2.5inch Ravin exhaust, subframe connectors, ported lower intake & heads=SOLD
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