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MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?
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Posted 3/24/2019 1:51 PM
G4Garret
Veteran




Date registered: Apr 2006
Location: Oak Ridge - Knoxville - Windrock Tennessee
Vehicle(s): 2000 G500, U1100
Posts: 231
100
MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

So my MY2000 G500 engine is intermittently misfiring on one cylinder at idle, and I haven't figured out why.

It seems to clear up as soon as the revs are up over 700 RPM or so, and otherwise runs as smooth as ever, although it now uses about a liter of oil every 2,000 miles or so. I think some of it is leaking somewhere.

History:

258,000 miles. No mechanical repairs ever (on the engine - drive train), except for fan belt tensioner and idler pulley, and serpentine belt. No engine ancillaries repaired either, ever, and it even has the original coolant in it, except for a few pints I've added over the years. Of course I change the oil and filters regularly.

Electrical repairs include mass airflow sensor, crank position sensor, pressure/temp sensor replacements, spark plugs twice, spark plug wires twice, and all coil packs. All of which were just done in attempt to resolve the misfire.

It's shown no codes on the OBDII, other than minor EVAP leakage.

I have not checked compression, nor done anything with the injectors, but I'm heading that way.

Any common problems or thoughts on the M113 that I should be looking for?

Secondly, I wonder why complete used M113s are so cheap on eBay?

Thanks in advance,

Garret




Edited by G4Garret 3/24/2019 8:06 PM
#240550
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Posted 3/24/2019 3:06 PM
paulunm
Regular


Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 80
50
Re: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Have you replaced the K40?

Edited by paulunm 3/24/2019 3:07 PM
#240552 - in reply to #240550
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Author
Posted 3/24/2019 3:18 PM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2000 G500 NMLE, 2015 Audi Q7 3.0 TDI
Posts: 9790
5000
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Garrett,

It's really a shame that you're not closer to Atlanta. I'd be happy to put the STAR Diagnosis unit on it to see what additional information it will tell you.

I actually owe you one anyway. Several years ago you put me onto the Rotex Gold brake pads. They are the absolute finest I've ever used. Sadly, they are NLA.

DUTCH
#240553 - in reply to #240550
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Posted 3/24/2019 7:00 PM
hipine



Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
5000
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

G4Garret - 3/24/2019 11:51 AM

...I wonder why complete used M113s are so cheap on eBay? ...


'Cause their insides are rotted out by owners who never changed the coolant?

Sorry, couldn't resist. But you really should consider doing some maintenance like that. Speaking of which, do you do any regular maintenance of the fuel system? Filters, injector cleaner like BG-44K, throttle body cleaning, IACV cleaning? All of those things can contribute to the symptoms you describe. Since it's kind of a wet season now I'd also consider giving any exposed electrical connectors a look including a drop of something like ACF-50 to combat corrosion and gremlins caused by high resistance. A little random miss at idle can be a tricky one to find for sure. Best of luck with it!

-Dave G.
#240554 - in reply to #240550
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Posted 3/24/2019 11:31 PM
G4Garret
Veteran




Date registered: Apr 2006
Location: Oak Ridge - Knoxville - Windrock Tennessee
Vehicle(s): 2000 G500, U1100
Posts: 231
100
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Hi Dutch,

Yes, I wish I were closer, and we'd hook it right up and see what it says. I'm kind of puzzled that I am not getting a check-engine light or trouble code. I'm leaning toward an injector though.

I was initially worried when it fist surfaced, mainly about catalytic converter damage, but I just pushed on since it didn't set a trouble code, or seem to affect running at speed or impact mileage, and I ended up completing a trip to DC and NYC. I might just drive down to Atlanta anyway, at this point I kind of doubt it will hurt anything more.

You're right about the Rotex Gold Brake pads. They work great. I'm saddened to hear they are no longer available though. I still have the original Rotex pads on my truck back in 2005, with well over 200K miles on them. I never imagined that pads could last that long, and work this well.

Whatever it takes, I plan to keep it going. I love this truck.

Garret
#240556 - in reply to #240553
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Posted 3/24/2019 11:52 PM
G4Garret
Veteran




Date registered: Apr 2006
Location: Oak Ridge - Knoxville - Windrock Tennessee
Vehicle(s): 2000 G500, U1100
Posts: 231
100
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Well, you got me there! It's true, I have never drained or changed the coolant in almost 20 years. I'm in that "if it ain't broke, don't fix it mode", kind of fearing that the cooling system must be in a natural state of equilibrium now, and changing it might upset that equilibrium, kind of like global warming, you know. So I figure I'm saving trees, and maybe humanity, by not changing it. Yeah, that's it.

I have changed the fuel filter about 10 years ago, but have never used injector cleaner, or messed with the IACV. I kind of forgot about that gizmo. Time to check it out.

Thanks,
Garret
#240557 - in reply to #240554
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Posted 3/25/2019 5:29 AM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2000 G500 NMLE, 2015 Audi Q7 3.0 TDI
Posts: 9790
5000
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

G4Garret - 3/24/2019 11:31 PM

You're right about the Rotex Gold Brake pads. They work great. I'm saddened to hear they are no longer available though. I still have the original Rotex pads on my truck back in 2005, with well over 200K miles on them. I never imagined that pads could last that long, and work this well.

Garret


My Audi Q7 has 64,000 miles on a set and still going. Normal Audi brake pads last about 20K miles.

Maybe the reason that the Rotex pads are NLA is that they were too good, and they had no repeat business after the first set purchased. It's really sad that they are no longer available! They were definitely superior to anything else.
#240559 - in reply to #240556
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Posted 3/25/2019 2:29 PM
Aircruiser
Extreme Veteran




Date registered: Aug 2011
Location: Atlanta GA
Vehicle(s): 2000 G500, 1986 300GD, 2017 Porsche Cayenne Hybrid
Posts: 360
300
RE: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

G4Garret - 3/24/2019 1:51 PM

So my MY2000 G500 engine is intermittently misfiring on one cylinder at idle, and I haven't figured out why.

It seems to clear up as soon as the revs are up over 700 RPM or so, and otherwise runs as smooth as ever, although it now uses about a liter of oil every 2,000 miles or so. I think some of it is leaking somewhere.

History:

258,000 miles. No mechanical repairs ever (on the engine - drive train), except for fan belt tensioner and idler pulley, and serpentine belt. No engine ancillaries repaired either, ever, and it even has the original coolant in it, except for a few pints I've added over the years. Of course I change the oil and filters regularly.

Electrical repairs include mass airflow sensor, crank position sensor, pressure/temp sensor replacements, spark plugs twice, spark plug wires twice, and all coil packs. All of which were just done in attempt to resolve the misfire.

It's shown no codes on the OBDII, other than minor EVAP leakage.

I have not checked compression, nor done anything with the injectors, but I'm heading that way.

Any common problems or thoughts on the M113 that I should be looking for?

Secondly, I wonder why complete used M113s are so cheap on eBay?

Thanks in advance,

Garret



Garret,

In the last year my MY200 G500 began a random misfire and small evap leak, 157K. The sds was essential when finding the faulty part or parts, coils and injectors can be tested and ruled out. Fuel trim data is helpful as are test actuations, etc. I replaced plugs and wires, MAF, fuel and air filters, catalytic converters. The MAF failed a test with the sds and the Cats were a logic based replacement. Currently mine is 95% miss free and next up are o2 sensors in an attempt to get some fuel economy back. The p442 code gets thrown every few months, smoke tests have not revealed the source. A vacuum leak can potentially cause the misfires.

You can buy, borrow a sds, but the learning curve is steep. For less money a sharp specialist with the right tools will get you all fixed up without firing the expensive parts cannon.

Matt
#240563 - in reply to #240550
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Posted 4/10/2019 6:14 PM
Aircruiser
Extreme Veteran




Date registered: Aug 2011
Location: Atlanta GA
Vehicle(s): 2000 G500, 1986 300GD, 2017 Porsche Cayenne Hybrid
Posts: 360
300
Re: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Pleased to follow up on my random misfire. I ordered the correct Bosch Premium Oxygen Sensors with the help of Sean at ET, Thank You! On the Europa G500, finding the correct sensors is not as easy as one would think, I can confirm that 2002 and up sensors do not work and EPC isn't totally correct due to federalization. Bosch 13798 is the correct sensor for all 4 locations. My milage is back up to the crappy range(13-15 mpg), up from the absurd (9-11 mpg) and the misfire is completely gone. In my case the Cats were deteriorated to the point of restricting airflow, MAF was occasionally at fault and the O2 sensors were slow/lazy.

PS. If anyone wants 4 O2 sensors for 2002+ G500. send me a PM. Used 4K miles, $100.
2 Bosch 16330
2 Bosch 16318

EDIT:
SOLD SOLD SOLD SOLD

Edited by Aircruiser 5/7/2019 10:49 AM
#240597 - in reply to #240550
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Author
Posted 4/10/2019 7:14 PM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2000 G500 NMLE, 2015 Audi Q7 3.0 TDI
Posts: 9790
5000
Re: MY2000 G500 Intermittent Misfire at idle. M113 collective wisdom please?

Aircruiser - 4/10/2019 6:14 PM

Pleased to follow up on my random misfire. I ordered the correct Bosch Premium Oxygen Sensors with the help of Sean at ET, Thank You! On the Europa G500, finding the correct sensors is not as easy as one would think, I can confirm that 2002 and up sensors do not work and EPC isn't totally correct due to federalization. Bosch 13798 is the correct sensor for all 4 locations.


Good information. Thank you, Sir!!
#240598 - in reply to #240597
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