Car Running Rough After Replacing Alternator

A common concern DIY Toyota and Lexus owners call CARspec for is a rough idle starting and dying or a hard start just after replacing or disconnecting the 12 volt starting battery. The engine ran poorly.

Symptoms Of A Bad Or Failing Alternator

Running rough after alternator change.

. Drove good felt like it had plenty of power shifted at lower rpms. I drove back home to see family 170 miles and only used a quarter tank of gas. The problem could still be a defective alternator or improper installation.

Pulled the codes and got P1131 P1151 P0136 3 INC CATLYST 02 SNSR 02 HTR 4 READY MISFIRE FUEL COMP EGR MAF. Now it drops every 3 seconds to about 300 then jumps back up to 550. Your battery light is on the problem may be your battery.

We wrote about something similar on the Prius being a common cause of the MIL. During this the voltage is usually normal when revved but really low when idling or coasting to a light. A vacuum hose or nozzle could have been damaged.

Also when doing a quick rev on the engine it sounds like its going to die then gets up past 1k rpms and runs just fine. If the voltage change and go back to normal when you tap it lightly with a hammer. Connect the battery saver following the instructions carefully.

All of this happens once the car and alternator are warmed up about 5-8 minutes after start up. So as the title says I just recently replaced my alternator. Stalling After a New Battery Installation.

After replacing it I started the car up and it sounded good. While replacing the alternator. Look for a worn out or loose drive belt alternator connection problems loose alternator mounting bolts and corrosion and dirt around the battery case and cables.

The engine is a 58l. Here is how it actually happened. A fuse could also be the cause.

Which after a little researching I know is too low. The gage stays just above the blue zone. The car got a computer code that said the camshaft position sensor was bad.

By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Any thoughts or suggestions. Check battery by itself when car is off it should read 126 volts.

I looked at the rpms and it was chilling at 500. The drop in rpm has a definite cycle to it. To check this at night in a dark area spray glass cleaner on the wires while the engine is running.

Disconnect the old vehicle battery and remove it. The engine and other electrical components of the car will follow and require frequent repairs and replacement. After that the car ran great.

On the way back from visiting family my alternator went out. After a new battery has been installed the engine could idle low or stall out altogether. Immediately following the replacement the car shakes and vibrates upon starting cold but seems to smooth out after about 10 minutes.

And I put in new starter too I changed starter because car wasnt starting and it is starting fine after new starter This low idle issue started when I replaced front cat converter one with the manifold last year. Make a Visual Inspection of the System. My mechanic cant seem to figure it out.

Insert the new vehicle battery use a battery brush to clean the cable ends and battery posts connect and tighten the cables and make sure the battery is secured in place. Up to 25 cash back The car runs real bad with alternator plugged in un plug it the car runs really good - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. Joined Jan 5 2016 41 Posts.

Up to 25 cash back I had the alternator replaced on my 96 Land Rover Discovery. When this happens you will notice a bit of rough idling and potentially loss of power until the ECM relearns all of this information. Under normal acceleration or even WOT it runs great.

A defective alternator can cause rough idle slow acceleration and hesitation. Jump to Latest Follow 1 - 20 of 25 Posts. Up to 8 cash back If by replacing the alternator the battery was also presumably dead at some point this will cause the ECM to need to relearn some of the fuel injection memory related to programming fuel curves etc.

Normal idle is about 550. You have a new alternator so if your battery is bad it wont hold the charge from the alternator. If there is a damaged wire you would see arching.

The battery is brand new as well. Discussion Starter 1 May 4 2016 Edited. If your running the car and its in the low 13 volts return alternator and get a new one.

A sparkplug wire could have been damaged. I am having low idle after replacing new alternatorits a brand new one not a remanufactured one. Replaced alternator then started it back up.

When the main power source is disconnected or reconnected it has a small chance of knocking out the computer idle memory learn procedure which has to be relearned to continue normal engine idle operation. Waits says the average price to replace an alternator with a remanufactured one is 400 while Gunning adds that a remanufactured alternator on a typical domestic car costs about 300 to 500 including parts and labor. That is a healthy charging system.

My alternator went bad and for several other reasons the car has been in a garage for about 6 months. The most common reason why your car is not charging the battery is actually because of a worn-out or damaged alternator. It took about 60 miles to get to normal idling i also let it idle for 15-20 minutes runs very smooth now.

For a while they just flicker but then they just stay on. You can carefully tap it with a hammer while the car engine is running while checking it with a multimeter on the car battery to see if the voltage is changing. It warms up a bid during city driving but goes cold again on.

I also notice a rough idle when those lights are on. Up to 8 cash back If your vehicle is losing battery voltage ie. Engine compartment was perfectly dry after the wash so I dont suspect water anywhere.

When the starting battery is disconnected on late model Toyota and Lexus vehicles the engine control. Cleared the code restarted the engine a few minutes later the check engine light. I just replaced the alternator and now the engine runs very cold.

Each time it drops it almost shuts down. 1 of 2 Go to page. Idling rough after replacing alternator.

If the alternator remains unrepaired for a significant period the battery will expire. Its been said but once you remove the battery from the car it. With the engine off pop the hood open and visually inspect the different components of the charging system.

The alternator was making a knocking noise my camry would sound like a disel truck or something at first i thought something was wrong with the engine but after checking it i found it was coming from the alternator. Started idling rough and the check engline light came on. Still idling rough.

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