Misfires after new coils/plugs and now...BRAKE PAD LIGHT?!
I guess the title tells the end of the story but there is a SURPRISE that really has me puzzled...
Backstory: "BIG SEXY" my 2008 C6 Avant is getting long in the tooth. 172,186 to be exact and is really starting to have issues. I had a CEL come on in December and from previous diagnosis thought it was time for new plugs. Got new plugs, went to install them and noticed a decent amount of oil in the spark plug wells. Buttoned it all back up and took it to a good local indy shop. Valve cover gaskets were relatively new (we've been chasing oil leaks for a bit, it's an Audi) so we figured it wasn't those. Long story slightly shorter, ended up doing cam seals/gaskets, actually did redo valve cover gaskets, brake vacuum pump gasket, spark plug tube seals, camshaft adjuster solenoid, serpentine belt tensioners and belts, idler pulley...a lot of stuff. All was good for about a week and then...oil puddle. Took it back and diagnosis is oil filter housing and possible oil cooler gasket leak. Another $1700 but I didn't do any of that because I was frustrated and needed to think. I think I can handle the Oil cooler gasket, maybe not the housing...still thinking. Monday of this week...CEL. Don't have a VAG COM so took it to AutoZone and codes showed cylinder misfires on 3 and 1 (which going over service records over the past few years is there have been misfires on 3 and 1 on multiple occasions) and Vacuum Pump -V22, Activation Ground (GND) - Upper Limit exceeded. Car was running fine so just keep driving it but yesterday, the BRAKE PAD WARNING LIGHT comes on. WTF?!? I look at the front pads and there seems to be PLENTY (haven't take the wheel off and put calipers the pads to see EXACTLY how much) of meat left on them. I am going to take the front wheels off and check the wires to see if they are ok but...would LOVE to hear some folks ideas on what might be going on with my car. Thanks for reading... |
Get CARISTA or VAGCOM, otherwise your doing little more that throwing darts at a dart board in that car. It seems to me that you have had a major catch-up session on the cars routine oil leaks. So, if you are keeping the car, you are caught up.
Not certain which Brake light comes up - there is a difference between pad wear and the E-brake. The E-brake freaks out on mine if the battery is at the low range. As to the misfires, if they were not present prior to the work then the first place I would look is at the wiring for the fuel injectors and an associated ground back behind the oil filter housing. Sort of a shot in the dark, but it had to be disrupted to remove the housing. |
Thanks for your response.
Originally Posted by das60
(Post 25880384)
Get CARISTA or VAGCOM, otherwise your doing little more that throwing darts at a dart board in that car. It seems to me that you have had a major catch-up session on the cars routine oil leaks. So, if you are keeping the car, you are caught up.
Originally Posted by das60
(Post 25880384)
Not certain which Brake light comes up - there is a difference between pad wear and the E-brake. The E-brake freaks out on mine if the battery is at the low range.
Originally Posted by das60
(Post 25880384)
As to the misfires, if they were not present prior to the work then the first place I would look is at the wiring for the fuel injectors and an associated ground back behind the oil filter housing. Sort of a shot in the dark, but it had to be disrupted to remove the housing.
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I would always resist the temptation to just go in a fix things on these cars. Your misfire likely show up with a fairly precise cause in VCDS or another tool.
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Originally Posted by das60
(Post 25880595)
Your misfire likely show up with a fairly precise cause in VCDS or another tool.
But, I do strongly suggest getting VCDS, as it can help you in many many ways. |
I have a 2008 A6 4.2 with 175k miles. I was chasing misfires for awhile around 170k miles. Turned out to be the fuel injectors. I did a carbon clean and fuel injector clean. Onr injector was in pretty bad shape so I replaced it. Runs smooth as butter now.
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Originally Posted by dzywicki
(Post 25880819)
I have a 2008 A6 4.2 with 175k miles. I was chasing misfires for awhile around 170k miles. Turned out to be the fuel injectors. I did a carbon clean and fuel injector clean. Onr injector was in pretty bad shape so I replaced it. Runs smooth as butter now.
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Originally Posted by das60
(Post 25880384)
Get CARISTA or VAGCOM...
I am grasping at straws because, I don't know what I'm doing really ☺️.Basic OBD2: P0303 (Confirmed) - Cylinder 3 Misfire Detected Engine: P0300 - Random/Multiple Cylinder: Misfire Detected P0301 - Cyl.1: Misfire Detected P0303 - Cyl.3: Misfire Detected P0456 - EVAP Emission Contr. Sys. (very small Leak): Leak Detected P2070 - Intake Manifold Tuning (IMT) Valve Stuck Open Transmission: P1890 - Signal wire for Tiptronic: electrical error ABS: 00473 - Electronic Parking Brake Control Module -J540-: Please read DTC Parking brake: 02443 - Operating unit: Electrical error in circuit Infotainment display: 01964 - Memory Seat Control Module / steering column adjustment: No signal/communication Digital radio: 02635 - Tuner not enabled/activated 00446 - Function limitation due to insufficient voltage: Lower limit not reached Sound system: 02558 - Left rear mid-bass speaker: Open circuit Heater & air conditioning: 01087 - Basic setting not performed: no or incorrect basic setting/adaptation 00256 - Sensor for refrigerant pressure/temperature: No signal/communication Body/convenience system: 01134 - Alarm horn: Electrical error in circuit Driver's door: 02115 - Lock unit for central locking: Implausible signal Front passenger's door: 02115 - Lock unit for central locking: Implausible signal 02116 - Mirror adjustment motor: Short circuit to ground Trunk: 00317 - Rear lid control module: Implausible signal Battery regulator: 02272 - Static current stage 1 02273 - Static current stage 2 02274 - Static current stage 3 02276 - Static current stage 5 02277 - Static current stage 6 |
Injector Service along with a new fuel filter is likely due but you could first try an injection cleaner fuel additive to see if it helps with the misfires.
https://cimg5.ibsrv.net/gimg/www.aud...e5c3d32cc.jpeg https://cimg6.ibsrv.net/gimg/www.aud...2c51626f9.jpeg |
Originally Posted by AudiAllTheWay
(Post 25881365)
Injector Service along with a new fuel filter is likely due but you could first try an injection cleaner fuel additive to see if it helps with the misfires.
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