She is starting to show her age

Overboost · #1 08-29-2018, 10:03 PM

160,000 miles and the old girl is starting to complain. I have a knock in the right front end that I can't identify so far. Changed the axle assembly but no love, noise still there when backing out of the garage. One loud knock and then silent. Wheels turned as I drive away and 2 knocks and then silent again until turning sharp in parking lots. I had changed both lower arms before the sound started occurring so I double checked my work and nothing was left loose.

Today for no reason the dreaded 4x4 light and amber brake light lit up followed by the trans failsafe mode. Shut everything down and restarted it and all the lights went out and all good again.

I have also been fighting a P0172 and P0175 system too rich left and right bank so I am doing a smoke test in the morning to see if an intake leak is causing those codes.

I unbelievably pamper both my BMWs but the X seems to want a little attention lately...

Ryoken · #2 08-29-2018, 11:43 PM

jeesh thats tidy

wpoll · #3 08-30-2018, 01:58 AM

Quote:

Originally Posted by Ryoken

jeesh thats tidy

That was my first thought too - she's looking pretty good for an old lady....

The thump/clunk sounds like either the top strut mount or possibly the spring seat. Get that noise in VW Golfs all the time - hard to track down.

upallnight · #4 08-30-2018, 08:45 AM

Quote:

Originally Posted by Overboost

160,000 miles and the old girl is starting to complain. I have a knock in the right front end that I can't identify so far. Changed the axle assembly but no love, noise still there when backing out of the garage. One loud knock and then silent. Wheels turned as I drive away and 2 knocks and then silent again until turning sharp in parking lots. I had changed both lower arms before the sound started occurring so I double checked my work and nothing was left loose.

Today for no reason the dreaded 4x4 light and amber brake light lit up followed by the trans failsafe mode. Shut everything down and restarted it and all the lights went out and all good again.

I have also been fighting a P0172 and P0175 system too rich left and right bank so I am doing a smoke test in the morning to see if an intake leak is causing those codes.

I unbelievably pamper both my BMWs but the X seems to want a little attention lately...

Do you know what the short term and long term fuel for each bank?

If I had to guess the MAF is dirty. This will not allow the MAF to measure the correct amount of air entering the engine. So with an incorrect of air entering the engine, the computer is compensating for the air-fuel ratio by adding fuel to the mixture, but the 02 sensor sees a different story so it is throwing up those codes.

If you have a scanner or software that can read real-time data you can see what the grams per second of air are being reported by the MAF.

Overboost · #5 08-30-2018, 08:52 AM

Quote:

Originally Posted by upallnight

Do you know what the short term and long term fuel for each bank?

If I had to guess the MAF is dirty. This will not allow the MAF to measure the correct amount of air entering the engine. So with an incorrect of air entering the engine, the computer is compensating for the air-fuel ratio by adding fuel to the mixture, but the 02 sensor sees a different story so it is throwing up those codes.

If you have a scanner or software that can read real-time data you can see what the grams per second of air are being reported by the MAF.

Yes, I have OBD Fusion and Torque Pro as well as INPA and BMW Scanner 1.4. The CEL came on on my 2500 mile family road trip and cleared it and it didn't come back on for 1500 miles until yesterday. The smoke test this morning showed a slight leak at the CCV itself but I mean very slight.

I will get out there and see what the MAF g/s flow is and report back.

Overboost · #6 08-30-2018, 09:14 AM

Quote:

Originally Posted by Overboost

I will get out there and see what the MAF g/s flow is and report back.

Here is the info at idle

Overboost · #7 08-30-2018, 09:42 AM

If the MAF is over reporting, FCP Euro has the Siemens/VDO MAF for $143 or a Genuine BMW for $385. Any suggestions?

white_335i · #8 08-30-2018, 10:38 AM

Quote:

Originally Posted by Overboost

If the MAF is over reporting, FCP Euro has the Siemens/VDO MAF for $143 or a Genuine BMW for $385. Any suggestions?

Joe, I have siemens in my X and e46 and no complains.

The knock, could that be a wheel bearing?

upallnight · #9 09-07-2018, 07:03 PM

Quote:

Originally Posted by Overboost

Here is the info at idle

The Long Term Fuel trim is negative, so the fuel mixture is too rich.

Fuel trim can be a valuable diagnostic tool - Eastern Manufacturing

Russianblue · #10 09-05-2018, 06:19 PM

FYI, I've gotten various knocks and clicks in the front end before after taking off the stiffening plate and re-using the single use bolts.

Both times, it started several weeks after taking off the plate. I guess the plate or bolts 'settled in' or something. In both cases, just tightening up the stiffening plate bolts cured the problem.