Aug 22, 2004 · Re: Help with F150 rough idle/hesitation/vibration I had a Very similar problem (no vibration) about 1.5 / 2 months ago with my 2000 F-150 4.6 V8 89,000 miles. The dealer replaced the plugs, which it was due for, and wound up replacing a coil pack to correct the problem. Yes when the surging and rough idle thing is happening that's when the alternator makes the sound. I did put a voltmeter across the battery and the voltage does drop but only by about .5v From 14.2 down to 13.7 or so then back up again as it surges. I was expecting worse. For now replacing the alternator again is the plan.
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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Jan 17, 2014 · I have been experiencing some annoying rough/erratic idles on cold engine starts. RPMs are jumping between 400 and 1000 until the needle settles at 800 after 30-40sec (see video). Engine/exhaust sound like a tractor during these first seconds and engine seems to stall almost.
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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Your looking for the voltage to be below about 0.5v. If the voltage is higher than that examine all the negative cabling for problems. Preform the same test with the positive side. Place the red lead on the positive battery terminal (if possible dig it into the battery post, not the terminal). Place the black lead on the bad post of the alternator.
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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Oct 18, 2013 · 1986 ranger 2.9l bad idle HELP MEEEE brand new fuel system and many engine management sensors, no vaccum leaks,why wont it keep a steady consistent idle? it goes from 850 to 1400,1500 when at a stop. no codes
- 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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:feedback:My 2011 eguc, with stage one and vance and hines power ovals and 33,000 miles, just started idling rough when cold,and will die if I don't hit the throttle to keep it going. It takes a few minutes to warm up and then idles pretty good, but I am getting the occasional spit and sputter...
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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The problem I'm having right now is the engine has a bad vibration at idle, in drive, park or neutral it makes no difference, it has all new mounts so I don't think its that. I took it to the local mercedes benz dealership here (before I did the transmission mount) and they told me it was the trans mount that was shot and was causing it.
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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Having a a major dilema with a rough idle / Multiple Cylinder Misfire on my 2001 Chevy S10. Its a V6 4.3L with 100K miles on it. The first sign of the problem was the service engine light would blink intermittently when driving on the highway or revving the gas. The blinking would stop after a few minutes and the light would go away.
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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Apr 10, 2010 · its a 1990 jeep wrangler"YJ" with the 4.2 it idles terrible.... sometimes it idles around about 1200rpm when hot.. and sometimes it will idle at around "500rpm also when hot" then shuts off..it gets very bad fuel mileage... like 6-8mpg....new fuel pump.new fuel filter,new muffler exhaust is welded solid,only hole is a small pinhole in the egr pipe.i ran some carb cleaner thru it...
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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Recently my 1997 528i has been running a bit rough on startup. After maybe 20-30 seconds of a rough idle, it suddenly smooths out completely and runs fine. When this happens, the revs jump up just a bit. However, it recently stopped smoothing out, and the check engine light came on. Here is what was stored (from INPA): E R R O R M E M O R Y R E ...

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You ruled out any loose connections ??Alternator bracket tight as the alternator grounds by the bracket Strange to see things fluctuating a loose connection could cause that a bad voltage regulator tends to go wide open or no output at all. During assembly the inner nut for the B Terminal may be loose.
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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Mar 10, 2012 · We had a LP forklift that did the same thing as your describing. Found that from the tank to the engine there were 2 filtering canisters that over time clogged up the delivery to the engine causing rough idle , loss of power , and shutting off. Inside is a type of mesh cloth used for filtering. The white substance on your rotor is just corrosion.
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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Battery Light and Rough Idle. Jump to Latest Follow 1 - 18 of 18 Posts. C ... The battery light most often means a bad alternator. Get it tested. Also, post up the ...
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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Nov 16, 2020 · Slight rough idle If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.
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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Mar 14, 2016 · A rough idle can be many things but the O 2 sensors are just reporting a bad exhaust fuel to air mix outside of expected values. The 1st O 2 sensor reports back to the ECU and tells if the Oxygen mix is incorrect ( car to rich or to lean) the 2nd O 2 sensor is just for EPA values.
2002 Taurus Rough Idle/bad gas mileage issue solved! Post by TatsumakiTed » Sun Apr 01, 2012 6:39 am. Hey guys!

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Your looking for the voltage to be below about 0.5v. If the voltage is higher than that examine all the negative cabling for problems. Preform the same test with the positive side. Place the red lead on the positive battery terminal (if possible dig it into the battery post, not the terminal). Place the black lead on the bad post of the alternator.

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