Q: 2012 audi a4 quatro, cylinder 2 misfires

asked by on May 03, 2017

2012 audi a4 quatro, cylinder 2 misfires, replaced cylinder 2 coil, replaced all spark plugs, 2nd cylinder fuel injector, cleaned carbon off the valves, replaced oil separator assembly, compression test reveals cylinder 2 at 130 vs 1 3 and 4 at 170, misfires at idle only, Please help

My car has 71500 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $79.99 - $99.99 Get a Quote

The variance in cylinder compression you are reporting exceeds that allowed in the Factory Service Manual. Put oil in the No. 2 cylinder to see if compression rises appreciably and you can then rule in or out leaks past the rings (the oil has the effect of sealing the rings). If compression is not higher with oil, the head gasket and/or valves are leaking and that may be a part cause of the misfiring. If those components are leaking, the engine will have to be repaired. There is always a possibility of an electrical fault in the injector circuit, so you can evaluate that and, as well, look at the secondary firing pattern in cylinder two which will provide clues as to what exactly is going on in that cylinder. If you desire a more conclusive diagnostic, please request a misfiring diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

How do I open the trunk?

You can open the trunk in several different ways, such as using your wireless remote control, the key or the trunk opener. Inside the Vehicle Locate the lever on the floor by the door sill, which will have an...

Cylinder 6 doesn't work on my Ford Explorer

Hi. A cylinder not working can be caused by several things. Two reasons that are common are an injector or an ignition coil failing. I recommend examining the coil, the injector cable and the number cylinder six to see if...

How do you read the HandsFreeLink® display?

Your car’s multi-information display (if so equipped) is the key to using the HandsFreeLink® (HFL) system to answer calls. Here’s how to read the display: The top of the screen shows a number of icons, including: Roaming...

How do you use the cup holders?

Depending on your trim level and how your car is equipped, it will have a number of cup holders in the interior. Here’s where you should look: In the center console: There are two potential styles of cup holders...

How do I delete all of the stored numbers?

You can delete all of the stored numbers in the Bluetooth system with one quick command: 1. Press the voice command button. 2. When the system says “Ready”, and then offers a tone, say “Delete all name tags”.

While Accelerating My Car Slows Down & Jerks Then Comtinues To Reg Speed I Did That Twice In Less Than 3 Mins

If the check engine light came on or blinks when loss of power then have codes checked to see if computer stored misfire or other codes nad may have a problem with one of the coils or spark plugs. ...

How do I adjust the pedals?

Each of your pedals (two if you have an automatic transmission, three if you have a manual) can adjust so that they sit at the ideal level for your feet. Adjusting your pedals requires a few simple steps. Locate...

How do you manually adjust the driver’s seat?

If your Accord has manual adjusting front seats, you have many of the same controls as on a power model with only a few minor exceptions. Bar: At the front bottom of the seat is a bar. Pull...

Check engine light on 1998 Audi A4

Any good mechanic can check them out. Here's the problem that you've got though--when there's a linking error, either the nanoport isn't working right because one of the pins is bent or there's wiring short somewhere in the computer system...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Avalanche
Few Few vehicles are as distinctive as the Chevrolet Avalanche. Part SUV, part truck, the Avalanche is actually surprisingly practical. On the inside, it feels more like a Chevy Tahoe, except when you look out your rearview mirror, you’ll notice...
How Long Does an Oil Cooler Last?
The The heat that the engine produces can produce a lot of damage in the right situation. Making sure that all of the systems on a car that reduce the heat of the engine are working properly is important. The...
A Buyer’s Guide to the 2012 Chevrolet Colorado
The The 2012 Chevrolet Colorado is the perfect size pickup for running errands on the weekend and doing light duty chores around the yard. For those who don’t need a full size pickup, the Colorado offers almost everything a full...