4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

slight miss at idle

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Old 02-12-2012, 11:47 PM
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Britdog15
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Arrow slight miss at idle

Okay so the other night i was driving and i hit the brakes really hard because someone pulled out in front of me and my car died and wouldnt start. Well it started leaking gas everywhere and i freaked out. It turned out to be the fuel line coming up the passenger side had come off. so i put it back on and drove as slow as i could to my buddies house and we inspected the car. nothing leaked for the next week. but when we checked the car out there is a slight miss. which is very hard to notice(at about 800ish to 1k) but if you bring the rpms up to around 1500 or 2k or more you no longer here the miss. there has been no codes like the last miss i had, where i replaced the plugs and wires and it fixed the code. my buddy said to throw out the bosch platinum ir fusion plugs that i bought and get just normal ones. You guys got any ideas for this slight miss before i replace 8 more plugs? thanks guys
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Old 02-13-2012, 06:16 AM
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EddyG
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Originally Posted by Britdog15
Okay so the other night i was driving and i hit the brakes really hard because someone pulled out in front of me and my car died and wouldnt start. Well it started leaking gas everywhere and i freaked out. It turned out to be the fuel line coming up the passenger side had come off. so i put it back on and drove as slow as i could to my buddies house and we inspected the car. nothing leaked for the next week. but when we checked the car out there is a slight miss. which is very hard to notice(at about 800ish to 1k) but if you bring the rpms up to around 1500 or 2k or more you no longer here the miss. there has been no codes like the last miss i had, where i replaced the plugs and wires and it fixed the code. my buddy said to throw out the bosch platinum ir fusion plugs that i bought and get just normal ones. You guys got any ideas for this slight miss before i replace 8 more plugs? thanks guys
Replace your idle air control valve and your tps (throttle positioning sensor) both of those being bad can cause very rough idles.
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