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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The ground is a major part of the battery's charging system, so assuming that you're getting proper voltage output from the alternator wire, and the battery isn't hashed, then you may be looking at a bad ground wire. If the ground wire is loose, then the alternator won't deliver its full power to the battery, particularly at idle. -
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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Symptoms: Rough idle when sitting at a stop light with the truck in drive. Less noticeable with A/C on since RPMs are higher. Shifting to N appears to Could it be your alternator? not on land cruisers but in the past I've had bad alternators cause bad idle. Not sure if you have a spare one to test this.-
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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Nov 15, 2007 · Is it possible that my 97 riv (63K) might have rough idling (rpms 750-800) because of bad alternator .It happens when car is hot . When in park position everything is perfect but when in drive and holding brake it shakes like crazy, also when i move my steering wheel the rpms drop about 100rpms for a second and then it shakes even more and the ... -
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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Symptoms: Rough idle when sitting at a stop light with the truck in drive. Less noticeable with A/C on since RPMs are higher. Shifting to N appears to Could it be your alternator? not on land cruisers but in the past I've had bad alternators cause bad idle. Not sure if you have a spare one to test this.-
: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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That is, a clogged IAC valve would tend to cause stalling or rough idling and hard starting? The idle air valve mechanism might have electrical faults Hondas I believe have an "electrical load detector" that goes bad and signals high alternator load and raises idle. A bad ECT could theoretically do it since...-
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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I have always kept it in top condition and running like new. However, recently the alternator expired and mandated a trip to the dealer. The dealer installed a GM alternator and AC Delco battery. Prior to this the car idled smoother than most new ones. Afterward, the idle is low and eratic; threatening a stall, perhaps. -
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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Could my dead alternator possibly cause this rough idle due to lack of current to the spark plugs? Or did I install plugs wrong, bad wires, etc.? Any ideas would be greatly appreciated.-
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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I replaced the convolute stock setup, with a large guage wire about 2 feet long, directly from the alternator to the battery, bypassing everything else, and saw approx a 1 volt increase at idle, indicating to me that the stock system was compromised by either age and bad connections, or just a bad design. -
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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Getting into evil? This guide will give you some tips. When you should you enter evil? Here are some things it is recommended you do first: Get your normal challenges done (Except normal 24hr, and maybe one or two No TM). A fully maxed and greened Choco Set.-
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 24, 2007 · 1989 Chevrolet Camaro Rough Idle. Reader Question: I was wondering if you might be able to help me out. I have a 1989 Chevrolet Camaro 5.0L V8 and I am having some trouble with it and every mechanic I talk to does not seem to know what the problem is. When I start the car, it will idle a little uneven at first then even out. -
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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Hello - I have a 2016 1.6L Soul. Currently 6,600 miles. Ever since I bought it new - Dec 2016, I noticed odd RPM idle fluctuation issues under various conditions. Basically, the idle dips similar to what I equate when you turn on the AC in most cars. However, my RPM dips when I roll any... -
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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Feb 22, 2014 · Re: 320i E90 Engine vibration, rough idle and misfire i recently resolved my low frequency shaking at D/P/N with rpm needle fluctuating +/-50rpm at P and N, but stable at D the shaking is very low frequency type of shake, but very strong, can feel on the seat and even the floor -
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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Jan 24, 2013 · If it is below 12.5 volts, either the battery is weak or the alternator is not charging it properly. Rough idle when cold also has many OTHER possible causes, too numerous to discuss here. If battery/ alternator is ok, the connect a OBD tool and see if any codes are being generated. larrym3711 2001 540iA Sport -
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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May 18, 2014 · Hello, I have a 2007 Mini S 126000 miles When you first start it it idles great for about 10 or 15 seconds then it starts to rough idle. It does not stall at this point I have let it Idle for 20 min and at stop lights does not stall. Once you get it going it runs very smooth no... -
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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At idle the the rpms fluctuate up/down, with the RPMS ranging between about 750-900. There is a constant 150-200 rpm bounce. The vehicle starts w/o issue but in gear or park it has the rough idle. When in gear, accelerating smoothly it does so evenly but it feels under powered. At 60 mph it needs to down shift to go over even small over passes.