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Bmw e90 auto rough idle

I have a rough idle and some times a flat spot, we have checked the spark plugs coils and i don't know wharf else bmw put it on the system tester but there is no errors. the rough idle is worse in D but is a bit better in N AND P the car stals most of the time when i reverse

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Car starts then immediately idles down and shuts off

i have had the same problem at times. my car would start and then shut off. but i found that i needed oil and check my oil and it was a quater low put in some oil and everything went fine i notices that everytime the oil is low the same thing happens also depending on the position of the car being park meaning that if you are in a down hill position or up hill position i will do the same. so you have to accelarate for 1 minute to have the oil go up. i hope this works

Posted on Jun 18, 2009

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SOURCE: idling rough. The coils and spark plugs have been

id clean the throttle body before spending more money on anything else, as carbon build up can cause rough idling.
you can clean it with throttle body cleaner, or just gasoline and a toothbrush, then wipe off the build up.

Posted on Jun 29, 2009

MauiRentaCar
  • 288 Answers

SOURCE: u i have a 97 ford escort that idles rough so i

Often, on the Escorts of this vintage, rough idle can be due to a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sounds coming from any of the vacuum hoses. Check that they are all securely in place and the end-clamps are all tight. Also check that the PCV valve and the hose connecting it to the manifold are securely in place. Another possibility is the Idle Air Control (IAC) valve. If it is clogged or sticking, it can cause rough idle. Refer to a service manual to diagnose the IAC valve. Other things to check: make sure that the air intake is unobstructed and clean. You might consider cleaning the manifold and throttle body. Check the air filter and replace if necessary. Let me know if you have any other questions.

Posted on Apr 02, 2010

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SOURCE: My 1994 Ford Ranger (2.3L, 2WD, Auto-trans) runs

I suggest to get the codes checked so you're not chasing a moving target. You'll need to look online - check out the Ranger/Explorer forums - or get the Factory Service Manual (FSM) to get the technical info you're requesting.

GL,
Td

Posted on Aug 07, 2010

mhgrenig
  • 2 Answers

SOURCE: Engine misfire on 2003 FordTaurus

I have a 2001 Taurus with a misfire in #2, I've already replaced all the plugs, wires, and the coil. I did a professional fuel injector cleaning at a well-reputable shop, I then had that same shop spend a day and a half to diagnose it, and it turns out that it is a sticking valve in that cylinder causing the misfire, have them test the compression off and running to see if that's the issue.

Posted on Apr 25, 2012

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2005 buick lacrosse 3.8 changed spark plugs coils N wires still shakes and sputters rough idle


The basics for vehicle with rough idle, check for a leak of some kind, fuel--egr--vacuum leak. How long since an over-all tune-up? You can check the idle air system? Any applicable trouble codes? To check codes yourself, at the least, you need an obd2 code reader.
If spark issue, sometimes you can use a digital multimeter to do some testing, low tech, non--invasive. With digital multimeter on low voltage setting, engine idling, touch spark plug wires, one at a time, do not penetrate insulation, don't take spark plug wire loose, it's an inductive reading. The point is if you get a reading bouncing off zero, that is where you start testing. I know you changed the coil/s, but sometimes, you need to check ignition module. I'm not saying that module is faulty, I don't know.

Feb 25, 2017 | Buick Cars & Trucks

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Rough idle, parts store said emissions. what needs checked?


Vacuum lines. And check for residue buildup preventing throttle body from closing .

Jul 01, 2015 | 2001 Ford Focus

1 Answer

What would make a BMW 528I idle rough


It could be one of the coils, a vacuum leak, idle control valve, bad spark plug, plugged cat converter or vanos problem. Get the codes read out and go from there.

Feb 22, 2015 | 2010 BMW 528i

1 Answer

Truck is not firing on 3 cylinders yet it runs.. Runs really rough, back fires, under powered.. Plugs are Wet, Firing order is correct. New Spark plug cables. Don't know that is wrong! Please Help


Check for spark at the plug ( may have coil problem).
If spark is good then do a compression check. Pressure shouldn't be less than 75% of known good cylinders.

Apr 17, 2013 | 1995 Dodge Dakota

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2007 chevy uplander running real rough, what could it be?


Vacuum Hoses
  • A loose or broken vacuum hose causes rough idling, and is the easiest repair of all. This is a very common problem since hoses wear out over time. Look in your engine compartment, and examine the hoses carefully for any signs of abrasion, breaking or loosening. Replace any damaged or broken sections of hose, available at most auto parts stores, and your rough idling will more than likely disappear.
Clogged Filters
  • Clogged filters are another common cause of rough idling. Inspect your air filter. If dirty, replace it. Also, a clogged fuel filter causes rough idling. It's hard to tell if a fuel filter is clogged or not, so a good rule of thumb is to change it at every general tune-up.

Electrical Components
  • Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. If it has been a while since you changed these components, do so. Most auto service centers can do this for you if you need technical expertise.
Timing Belt
  • A timing belt jumping a tooth is also a cause of rough idling. This throws off cam timing, setting in motion a series of events that prevent your engine from achieving proper timing. This is a more in-depth repair and, if needed, should be referred to a qualified auto mechanic.

Jun 24, 2012 | 2007 Chevrolet Uplander

1 Answer

Squeeling noise, very rough idle (sometimes stalling), no engine code


Rough idle / stall at idle Check for vacume leaks & split intake tube or loose clamps on intake. Noise put spot of grease on drive belts if noise goes you may need new belts or a tighten up.

Jun 16, 2012 | 2004 Ford Freestar

2 Answers

My bmw 320i e90 2005 only cranks but won't start


Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.
Thanks.

Feb 13, 2012 | 2005 BMW 320i Automatic

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