If the plug wires are bad you should see some arching to the cylinder head or fuel rail. If the car idles rough or cuts off at low RPM or idle, the cause could be a failing O 2 sensor. The O 2 sensor is out of the loop at full throttle and will not affect the way the car runs. A rough idle can also be caused by a problem with the air flow box.
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Rough idle. Possible engine misfire. Loss of battery states of charge and/or health. Erratic or malfunctioning dashboard instrumentation. Loss of Start-Stop functionality. Alternator, or related, faults that can cause the above symptoms are:
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I also notice a rough idle when those lights are on. All of this happens once the car (and alternator) are warmed up (about 5-8 minutes after start up). For a while, they just flicker but then they just stay on. During this, the voltage is usually normal when revved but really low when idling or coasting to a light.
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- Intermittently idles roughly - or stalls - at a light or stop sign, like it's hiccuping. - The occurrence of this has been slowly increasing. thats a problem there, would focus my effort on whats causing that, bad alternator could be sporadic, working fine 1 day when at the shop, then bad off and on other...
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Its gotta be a bad driver in the PCM! Both 12 volt feed to ASD relay strong an can power pretty much anything! I'm getting a 12 supply from the PCM which is I've been chasing wiring diagrams an coming up empty handed! Now for some reason my alternator isn't charging an getting a code for system to...
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Aug 10, 2010 · It passed 5 times with flying colors. I brought a alternator anyway.. Car runs perfect now. My underdrive performance pulley sucks the voltage down @ idle/red lights, but thats normal for underdrive pulleys. I might get rid of them soon. And anyone out there.. take autozone/murray/advanced auto/pepboys alternator test with a grain of salt.
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Idle is worse with air conditioner on. Doesn't seem to have rough idle problems when fast idle is on. (e.g. when it's been sitting overnight). Misfires were recorded at highway speeds once, but mechanic was unable to reproduce it.
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The EGR valve regulates how much exhaust gas goes back into the engine, and carbon buildup in the unit can gum it up and stick it open over time. This will ultimately result in a loss of performance, bad fuel economy and a rough idle. Spark Failure
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The issue is as follows (yes i have used the search function): The Sport will turn over, sputter, backfire out the air intake. When it does finally start it revs high then drops down to a normal idle speed but still stutters sometimes.
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Jul 27, 2014 · You could run a new air filter. An old air filter. Hell, shove a stray cat in there. It's not going to affect how the car idles. You either knocked a hose loose that is behind the MAF (allowing...
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May 20, 2010 · A rough idle is usually indicative of a cylinder not doing it's job, and is more noticeable on a four cylinder engine. First thing I would do is set the timing back to spec. New wires, distributor...
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It would allow too much air into the manifold at idle & does cause missing & rough idle. In the begining, the Universe was created. This has made a lot of people very unhappy, and been widely regarded as a bad move.
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2002 Taurus Rough Idle/bad gas mileage issue solved! Post by TatsumakiTed » Sun Apr 01, 2012 6:39 am. Hey guys!