Question about BMW Cars & Trucks

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I have a 1997 BMW 528i that idles rough and now the check engine light came on. It idles rough, but when you press on the gas it runs smoothly. What could be the problem(s)? And the battery goes dead

I charged the battery and put it back in my car, and then a couple weeks later it was dead. So, I charged it again and waited three weeks (way longer than I usually go without starting it) and then put it back in, and the car started and the battery is not even close to dead. And about the rough idling and check engine light, is there something I can do? or will I have to take it to a mechanic?

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  • BMW Master
  • 16,194 Answers

Cars use the battery when they are not running. It is called parasitic drain. When the light comes on if you take it to a major autoparts stor like checker, advance or autozone, they can check it for free and tell you what the light means.

Posted on Feb 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

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fastboyz
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SOURCE: 1999 Ford Escort idle problems

you need to look for a vacume leak thsi would also make your IAC valve go beyond range.good luck

Posted on Sep 12, 2008

  • 1 Answer

SOURCE: Rough idle at start up

My 1997 lesabre has developed the same problem. I replaced plugs,wires,pcv valve and O2 sensor to no avail. Also tried several tanks of high octane. Yesterday I left the store and it wouldn't start at all. Had the car towed to a good local shop. Today they said it starts fine and has been all day! They checked everything they could think of and can find nothing wrong. The head mechanic suspects the crank sensor but said it should give a check engine lite if it was having a problem. Of course the third time I started it after picking it up the damn thing barely ran for a minute or so before finally smoothing out. No check eng lite. This is becoming very frustrating!

Posted on Sep 28, 2008

  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

  • 95 Answers

SOURCE: 95 cadillac eldorado engine stalls rough idle check engine light is on

My son has this same car with the same problem. So far after tune up and other process of illimination, the problem points to the catalytic converter. If it is clogged you will get this problem with the rough idle and stalling. Look under the car at night after running it and see if the catalytic glows red. If so you need a new one. Hope this helps.

Posted on Mar 20, 2009

  • 599 Answers

SOURCE: Car stalls when idling at stop light

have the car checked when the check engine light is on,also a good scanner will be able to give you the history codes,get back to me with the codes and we'll go from there. you need someone with a professional scan tool

Posted on May 13, 2009

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