robertwjackley

OK to start with I'm a Audi owner of many for many years. 1984 4000s, 1985 4kq, 1985 5000s turbo, 1989 100 quattro, 1991 200 turbo quattro, 1992 4.2 V8 quattro, and now a 1998 A6 Avant 2.8 quattro C4.

This A6 is giving me trouble. I can do anything i want with the others, but this A6 man I have to learn the car.

i have had this car for a year has been a good car lots of little things go wrong nothing to big. Yesterday i drove a 1/2 hour parked for about 2 hours. Went to start it and no go, I have had all of other cars do this to me at one time or another and have always been able to figure out but not this one!!! had it towed home. Here is a list of tests I had done.

it has no spark
no fuel in the cylinders, but fuel pressure going to the rail.
checked timing by eye, the big holes on the cam are strait across when the timing mark on the front pulley is dead on, but I can not get the #1 cylinder to hit TDC with the other markers lined up??? and I do not know where the crank lock port is on this car??
Compression test was good High 170 low 150 on a cold motor close to being with in 10%
I unhooked the battery for 10 minutes made no difference.

I do have someone coming sometime this week to pull codes, he said could pull Audi specific codes.

My main question is how could the #1 piston be off from the marks on the crank shaft pulley?? is the #1 piston supposed to be at TDC when the Marks are lined up?? Everything look to be in the right place but that piston??

When he pulls the codes I'm guessing it going to be two cam sensor

A6Gary

Cylinder #1 is not the cylinder that marks TDC. IIRC, it is Cylinder #3 on your 2.8L 30V V6. To find TDC, you use the marks on the crankshaft pulley/damper and the camshalft holes, which are used to do the TB maintenance. The crankshaft lock pin goes into the hole where the engine speed sensor is mounted, on the left (driver's) side of the block. You remove the sensor and thread in the lock pin when you have the negine at TDC.

4Driver4

Start by going to the C4 forum for answers. They are more familiar with the 12v.

Stop disconnecting the battery. That does nothing but erase the codes (and wipe all settings from all control units - bad idea) that might help you solve the issue.

Stop worrying about timing if you have good compression.

Start at the beginning: pull the codes (if there are any now). If no codes, try cranking the engine to see if there you can get a code(s) to set. Stop taking other stuff apart or you might create issues that throw new codes that are unrelated to your issue.

Is your fuel pump running?

Always pull codes first. Always.

4Driver4

His engine is a 12v. ;-)

A6Gary

Yep, missed that it was an Avant, so his A6 is the same as my old '96 A6 Avant.