We say it in most articles we write, so excuse us for being redundant. But for many of us our BMWs are unfortunately getting old. Ok…insert your sad frowny face emoji here. When Bimmers get over ten years old, its time to face the facts that many engine parts are going to need replacement, especially in the air intake system. Since both parts have a maximum life span of approximatelymiles, if one is failing most likely the other is ready to go as well.

Do yourself a favor and spend the extra money and replace both parts. Always replace the rubber grommet when replacing the valve. Help your E46 3 series engine breathe better with a fresh air filter element. Cabin air filter optional — Since you will need to remove the cabin air filter housing in order to do this repair, now is a great time to replace your filter. Replacing your cabin filter insures your new blower motor circulates clean fresh into the interior of your car.

We give you several choices based on your budget. Make sure that you take your time during reassembly to avoid any leaks in the intake system, especially when reinstalling the intake boot. And congratulations for Doing It Yourself! The Level of Difficulty displays graphically how challenging the repair is, from beginner to expert. Beginner repairs usually require very few tools, have short repair times and are simple to complete for even the most novice of mechanics.

As the difficulty level rises expect the repair to demand more time, use more specialized tools, and require a better understanding of mechanics to complete the job. The Repair Cost graphically displays approximately how expensive the repair will be to perform. Please note that these cost estimates are approximate and can fluctuate based on brand preferences and manufacturer. BMW E Share on Facebook. To see other repairs on our site using this actual car, please click on the image below!

Repair Summary The following article gives detailed instructions on performing a rough idle repair on a BMW E46 3 series car.

Even though we have used a BMW ci to perform this installation, this article can be applied to any E46 3 series vehicle with the M52 or M54 six cylinder engine with minor modificationincluding the i, i and i coupe, sedan and convertible.

For more information on affiliate linksplease click here. DISA valve — Vaico Air filter — Mann Air filter — Mahle Cabin filter — Mann Cabin filter — Genuine BMW Cabin filter — Kengst BF. The BMW Repair Guide makes every attempt to publish their repair articles with detailed step by step photographs, videos and written instructions.

Since this repair deals with varying years and models, your vehicle may be slightly different than what is shown in the following steps and images. Some repairs may also require additional steps not covered in our articles like: removing covers from the engine and undercarriage, moving wires or hoses to access parts, cleaning and lubricating parts associated with the repair and performing general maintenance.Fluctuations in engine idle speed can be annoying and may even cause stalling at idle.

Engine stalling can be dangerous, because power assistance is lost to the steering and brakes. Idle speeds below those specified by the manufacturer will affect the performance of the power steering pump, alternator and AC compressor. Emission control devices also require a minimum engine speed for effective operation. Surges that accelerate engine speed could cause unexpected vehicle movement.

A clogged or obstructed air filter can cause surging at idle, and foreign objects can enter the filter housing at any time. Any debris in the filter or housing might restrict air flow to the engine enough to affect idle speeds.

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Clean the throttle body or carburetor venturi s after replacing a severely dirty air filter. Aerosol products designed for this purpose are available at any auto parts store.

Instructions for use are on printed on the can. Fuel filters can become restricted and deny proper delivery at idle speeds. Mechanical fuel pumps may overcome restrictions and performance deficiencies at higher speeds. Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines.

The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge. Any extra air entering the intake manifold will lean the mixture at idle and surging will result. A visual inspection of vacuum hoses may reveal cracked or leaking hoses.

A short length of tubing can serve as a make-shift stethoscope to pinpoint any hissing noises heard on a running engine. Cracked or clogged positive crankcase ventilation valves can adversely affect engine idle quality. Idle solenoids or controls should be adjusted to specifications after vacuum leaks are repaired. Ignition system problems can contribute to idle surge. Ignition timing and the condition of spark plugs and related components should be be checked before seeking professional assistance.

Lack of compression, and valve timing and condition issues are complex to diagnose and usually affect overall performance, but can be more pronounced at idle speeds. Contributing emission system flaws may require advanced testing techniques or equipment.

A visit to a qualified repair facility might be necessary. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Vacuum Any extra air entering the intake manifold will lean the mixture at idle and surging will result.

Engine Issues Ignition system problems can contribute to idle surge. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Password Forgot Password?

Join Us! Join Date: Aug Posts: My ranger has a surging at highway speeds It also has a piss poor idle I am heading down to a buddies house tomorrow to run a fuel pressure test Join Date: Oct Double check plug gap. Also make sure you have good fuel pressure. Pull your air filter and see if it runs smoother without it, if it does, replace it.

Checked the plug gap when I put the new ones in and the air filter is new though it is a garbage Fram filter. I think it is the high pressure pump. Join Date: May I had a 90 bronco II with 2. It would even throw a cel indicating a ignition problem and then a few miles later it would be fine. I replaced everything you have plus some, including new fuel pressure regulator, ignition module and checked for vacuum leaks.

Ended up being the o2 sensor. Join Date: Sep Posts: 1, I'm gonna say either O2 or MAF. Most likely O2, though. Way too much done to list and it's also not even close to done. And I'm tricking her out all over this town.

Join Date: Jun He will have a map sensor, no MAF. Pull codes and go from there. No check engine light to let you know when the computer sees something out of range or a faulty circuit. Could be anything from a vacuum leak to a bad sensor. Problems in EFI systems can get complicated, that is why the self tests are there - to help you narrow down what it is.

Originally Posted by Psychopete. Well it turned out to be a fouled plug. I am always good checking the gap I felt stupid as hellI also replaced the plugs and coil since I was already there.

This caused a new vacuum leak at the front crankcase seal. I tested this by removing the oil dip stick and the whistle stopped and could hear a surge of air through dip stick hole. My check engine light is on but not blinking. My question is, would a vacuum leak at the crankcase seal still be causing a rough idle and surging? Do you. Hi and thanks for using 2CarPros. With a properly operating PCV, you shouldn't be getting that much pressure in the crank case. As far as the leak you described, that wouldn't be a vacuum leak but rather the pressure is blowing outward.

Also, there shouldn't be vacuum in the crankcase. If the PCV is good and working check it for vacuum then I question if there is excessive blow by being caused in the engine due to a compression loss via rings. An erratic idle can be caused by a vacuum leak, or an idle air control valve. But again, vacuum would be drawing in and not blowing out.

You may want to perform a compression test to confirm the pressure is within the manufacturer's specs. If one or more cylinders are low, that too will cause idle issues.

Removal Procedure 1. Remove the throttle body assembly. Refer to Throttle Body Assembly Replacement 1. Remove the spark plugs.

The Causes of an Idle Surge

Remove the relay holder cover.Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology. Engine rough idle problems arise because car engines are demanding. Components in the fuel, ignition, emission and other systems should work correctly. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate.

Troubleshooting Engine Rough Idle Problems

Idle problems may originate in a worn out component, a failed part, or a blown gasket. The number of potential sources of a rough idle can make your diagnostic a little difficult. Still, you have at your disposal several tools to help you troubleshoot and fix the problem sooner. Even more, on modern vehicles the car computer monitors many sensors and actuators and usually can detect small deviating operating parameters and store related trouble codes as necessary.

The code may indicate the component, circuit or system involved in the fault.

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So this gives you an additional advantage. In this guide, you'll find many of the components that, when going bad, will usually cause engine rough idle problems. The components are ordered from the most frequent to the least, either because they usually receive little attention or because they are bound to fail within a number of miles of operation. To make the most out of this list, pay attention to the 'Other symptoms' at the bottom of each component description.

And compare these symptoms and conditions to the ones you've noticed in your car. This will help you zero in on your diagnostic faster.

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For example, when your engine idles rough, you may notice the problem only shows up before the engine warms up; then idle smooths out. This may indicate a bad ECT sensor as described in Other symptoms in that section. So pay attention to all the symptoms and conditions when given in each component listed to make your diagnostic easier. Before starting hunting for the source of a rough idle, you can do this simple method to confirm that you have a driveability problem.

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It'll work in most cases. Set your transmission to Park automatic or Neutral manualand apply the parking brake.

Start the engine and let it idle. Now, listen to the sound coming out of the tail pipe. If you hear a clear popping sound, most likely you have a performance problem; if not, check the engine mounts.

rough idle and surging

A worn out, loose or damaged engine mount can cause the engine to vibrate. A faulty spark plug may cause several engine performance problems, including an engine rough idle. The same conditions under which the spark plug operates, along with poor engine maintenance, may foul the tip with ash, oil, or carbon deposits.

On top of this, miles of service cause the plug electrodes to wear out, widening the gap. This causes an increase in the voltage needed for the spark to jump between the electrodes; but this condition may burn the plug tip and other ignition components, resulting in a rough idle and possibly other engine performance problems.

Other symptoms: you may notice misfires, an increase in fuel consumption, loss of power and hard starting.

rough idle and surging

The air filter traps dirt, dust particles and other matter out of the air going into the intake manifold. Most filters use paper as the filter element and after a few months of work, the elements clogs, reducing air flow rate.Remember Me? Results 1 to 14 of Thread: Rough Idle-Surging. Thread Tools Show Printable Version. Rough Idle-Surging Anyone in the forum have this same issue. I researched it the best I could but couldn't find any info on a fix.

Service Bulletin Number: It is fully detailed below RPM's will race between and in a nano second and the bike will surge forward. It started happening after about hundred are so miles, subtle at first, and has gotten more noticeable over the weeks. Now it has a rough idle all the time and is becoming a safety hazard while at stop lights and in traffic.

When I have started the bike all this week there has been a loud beep as well. I don't know if that was always there or not.

At stop lights the bike will surge to and bike will lurch forward.

rough idle and surging

The bike also clatters and shakes at cold take-off and reverse when the gas is applied. If anybody else has had this issue could you reply here and tell us what the fix was. Originally Posted by Spyder Hawk. Anyone in the forum have this same issue. Mine is in the shop as we speak! Mine is doing the same thing I have almost miles on her. It started about three weeks ago.Idles rough, worse under load and surges at times.

Rpm varies at constant speeds occasionallyhesitates when trying to pass a vehicle or speed up. Cruise control works intermittently. Going up on an incline, losing lots of power. No DTC except for p emissions circuit. Replaced tps, iacv, cleaned throttle body, new plugs, wires, distributor, rotor, and coil.

This may be related to the evaporative purge solenoid. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister.

rough idle and surging

The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine.

The vent control valve solenoid controls the flow of outside air in and out of the charcoal canister. Normally, the vent valve is open.

It closes when the engine computer tests the EVAP system for leaks. If a leak in the EVAP system is detected, the Check Engine Light will illuminate on the dash and the trouble code related to the problem will be stored in the engine computer. If you have an air leak in the EVAP system, then the MAP sensor will not be able to determine the air density, and the MAF sensor will not be able to determine the volume of air entering the engine correctly.

This will lead to an over-fueling situation or an under-fueling situation depending on the size of the air leak and engine operating speeds and load. I would recommend having an expert mechanic, such as one from YourMechanic, come to your location to determine why you are having a rough idle and a loss of power.

My car has miles. My car has an automatic transmission. Jeff Engstrom Automotive Mechanic. Thank Jeff. Was this answer helpful? Thank you for your feedback! Sorry about that. Why wasn't this information helpful? Recommended Services. The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details. Related Questions. My headlights went out completely Chevrolet Impala by Impala 2.

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