error code P2187 P2189

[jhy311]

hi, everyone, greetings from Texas.
mine is 03 4.4i
SES light turned on one week ago when I just finished pumping gas. I originally thought it was caused by the cap. after one week, the light's still on, but everything else seems normal. then had the codes checked this morning, two showed up P2189 P2187.
it says "system too lean at idle speed bank 1, bank 2". I did nothing but went ahead erased the codes.

after the codes were erased, problems started. the engine quickly shut down after I turn it on. It appeared to have very low idle speed. I had to put the gas pad hard to keep the engine running. and at idel, the engine shakes alot, and the idel speed is low and unstable.

can anyone give me some clue. how come the engine runs well before I erased the error codes, but run terribly afterwards. I hope the engine can come back to normal after running a while.

thanks for your attention.

Eric

[Mackskibum]

Is SES flashing? Do you have any hard data from the ECM or just a code?

Could be a bunch of things:

MAF
fuel pump
bad gas
clogged injector
vacuum leak
bad o2
etc.

BTW, check the vacuum hoses at the rear of the engine. Did the shop fool with anything else under hood while you were getting the codes scanned?

[jhy311]

Originally Posted by Mackskibum

Is SES flashing? Do you have any hard data from the ECM or just a code?

Could be a bunch of things:

MAF
fuel pump
bad gas
clogged injector
vacuum leak
bad o2
etc.

BTW, check the vacuum hoses at the rear of the engine. Did the shop fool with anything else under hood while you were getting the codes scanned?

the SES was not flashing. I used Actron CP9135 to read the codes, and it only gave those two numbers. I earsed them immediately after I wrote them down.

yesterday the weather was cold, about 35F degree , so I guess that is why the car has problem on starting. I think even I did not earse the codes, the rough/low idle speed problem would still happen.

anyway, yesterday I drove the car for about 10 minutes local road, and then tried to restarted it . The rough idle speed no longer occured, at least not noticable. I guess the cold weather caused the idle speed problem. I know the problem is still there, but I think I can drive the car for several days until the error codes show up again. Then I will bring my x5 to stealer.

I appreciate you guys inputs. I DIY some on my previous maxima. I own this 03 X5 for about 6 months, current meter reads 52k miles. I'd better let the stealer fix the problem this time.

Hey, Mike ( Noncom23), glad to see u here, which stealer you think is better, Classic BMW or BMW of Dallas?

[noncom23]

Classic. See Pat Arnold.

Originally Posted by jhy311

the SES was not flashing. I used Actron CP9135 to read the codes, and it only gave those two numbers. I earsed them immediately after I wrote them down.

yesterday the weather was cold, about 35F degree , so I guess that is why the car has problem on starting. I think even I did not earse the codes, the rough/low idle speed problem would still happen.

anyway, yesterday I drove the car for about 10 minutes local road, and then tried to restarted it . The rough idle speed no longer occured, at least not noticable. I guess the cold weather caused the idle speed problem. I know the problem is still there, but I think I can drive the car for several days until the error codes show up again. Then I will bring my x5 to stealer.

I appreciate you guys inputs. I DIY some on my previous maxima. I own this 03 X5 for about 6 months, current meter reads 52k miles. I'd better let the stealer fix the problem this time.

Hey, Mike ( Noncom23), glad to see u here, which stealer you think is better, Classic BMW or BMW of Dallas?

[jhy311]

The service advisor I deal with was Rocky Heuer, good guy.

Originally Posted by noncom23

Classic. See Pat Arnold.

[noncom23]

Glad to hear it worked out OK. Yeah, Classic is loosening up on the loaner thing. Good luck.

[supersteve]

Sounds like MAF, the air intake boot has fallen off the throttle body or a huge vacuum leak.

Did you check your oil when you filled up? The dip stick is behind the air intake boot. It's possible you knocked it off checking the oil.

The "too lean" means a intake/vacuum leak after the MAF and before the O2 sensors. For it to be on both banks narrows it down to between the MAF and the intake.

The MAF knows how much air is going in and it tells the computer how much gas to put into the mixture. The O2 sensors confirm what is going on. If more air is going in than the MAF is saying the O2 sensors pick up a lean mixture. For both banks to be lean it has to be something that both banks have in common. . .MAF, air boot or vacuum leak. Additionally, the MAF would set it's own code.

[noncom23]

:xoutpost: Glad to have another Dallasite.
Anything more on your problem?

[jhy311]

Originally Posted by noncom23

:xoutpost: Glad to have another Dallasite.
Anything more on your problem?

one week after I erased the error codes, the ECE light turned on again. showing the same codes. will visit Classic BMW next weekend. will report what they figure out.

[ssx5]

Originally Posted by jhy311

one week after I erased the error codes, the ECE light turned on again. showing the same codes. will visit Classic BMW next weekend. will report what they figure out.

Keep us posted. Me Dallasite too!!