Rough idle bad alternator

The idle air control valve is responsible for controlling the RPM when idle. It essentially puts the engine in a relaxed state whenever the power is not needed. When it goes bad, the engine will stall, which means it may abruptly stop working. The effects usually gradually worsen in time.Feb 03, 2020 · A bad battery or bad alternator can result in various performance problems. Almost every car owner will have to deal with alternator and battery damages at some point. It is easy to misdiagnose the power problem blaming it on a bad alternator when the issue is really from a bad battery or vice versa.

mcdevito75 here, Sounds like a faulty voltage regulator, it"s 1 unit with the alternator, change the alternator, also the alt. supplies juice to the ignition switch, distributor abd plugs, thus a rough idle due to bad alternator.
When you notice a combination of issues like rough idle, flickering lights when you start the engine, dimmed headlights, and difficulty in starting the vehicle (which mostly points to alternator issues) you want to check the serpentine belt. So if you have searched for answers to the question, can a bad serpentine belt cause rough idle?
However about a week after I did the alternator, I got a horrible rough idle, the thing barely runs, dies at stop lights, pretty bad black smoke from tailpipe (ecu going full rich). It surges and chokes when driving and even the transmission shift points are messed ok. Battery still shows 12.4-12.6 at rest, however the alternator voltage at ...
Apr 09, 2010 · This morning when I was at a stop light, my car started idling really rough and almost stalled and the BATTERY ALTERNATOR- VISIT WORKSHOP light came on. I recovered the stall and the car ran fine. This happened twice today for the first time ever (02 C240). It has been a really rainy day...
This article takes a closer look at three common causes of rough idle. Engine Misfires. Perhaps the single most common cause of rough idle comes in the form of a misfiring engine. As you may know, any automotive engine contains multiple cylinders. Each of these cylinders contributes to powering your car by combusting a mixture of gasoline and air.
Dec 05, 2014 · The rough idle when cold is not normal. Start with the alternator, but I would suggest adding another 4 ga. wire from the alternator charging post to the + terminal on the RH battery, and another from one of the alternator mounting bolts to the chassis ground lug (on the crossmember below the AC compressor).
A rough idle can be caused by a number of factors, many of which are easy to repair. Fixing idle issues is important, as doing so will ensure that you maintain proper control of your vehicle and it is able to continually give you great performance and maximum fuel efficiency. Let's look at some of the most common causes of a rough idle.
Something more to add, I did a test once where i drained the ecu/ecm of all power for a week or two, upon which the rough idle and inability to rev were gone for about 20-30 minutes after which the rough idle and rev issues came back, don't know if that will be of any help in the diagnosis. Thanks in advance for any further insight that can be had.
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Joined Jun 25, 2014. ·. 338 Posts. #12 · Mar 6, 2020 (Edited) The current draw from the motors can often cause a slightly rough idle when the alternator kicks in to charge the system. If you want to see if the clutch (OAP) on the alternator might be going bad you can drain your battery a little with the engine off and your headlamps on.
Rough Idle Suddenly After Alternator Replacement Rough Idle Suddenly After Alternator Replacement. By Guest, August 2, 2002 in Buick ... Should be in the 14 volt range with the engine running. A low voltage caused by a bad replacement alternator or battery can cause all sorts of problems. <P>Glad to see you are so happy with your Reatta. ...
Rough Idle in the Cold . ... You have a bad idle speed control unit. The Fix: Replace the idle speed control unit. The alternator may not be working properly. The Fix: Replace the alternator. Stalling Upon Stopping . You are driving along and everything is just fine—until you let off the gas pedal and apply the brakes. At that point, the ...