struikie - Audi 80 B4 quattro project

[struikie]

My starter motor (solenoid) decided to slowly die. Got a used one
and swapped it in today.



Engine has been lumpy for a while. Can't find the cause.
Swapped injectors (refurbished)
Checked plugs - all look fine
New leads (I had broken one)
New coilpack
New cam sensor
New crank sensor (also because of the new seal)
Vacuum lines hold vacuum
Set FPR at 4bar with no vacuum attached
Checked compression - all get up to 12 bar

Pulled the vacuum line off the FPR. When blocking this
off I can hear a leak. With the line open I cannot hear
that same hiss. I'll pull the intake next weekend and see what
I will find.

JW

[struikie]

Removed the intake manifold and took it apart.
Both the plastic top and bottom part have a rubber track
that is meant to seal to the aluminum middle part. Both were really
hard and flat. Dug the rubber out and put a bead of liquid gasket
in. Reassembled and let it sit for a day.

While the intake was off I saw that the knock sensors were in bad shape.
Replaced both. Also replaced the ISV as it wasn't looking too fresh.

On first start it idled at 1300rpm. A little throttle blip made it hunt.
Second start all was well. It took the ecu a bit of time to set the ISV
correctly. It hasn't been running a nice as this for a long time.
Smoother and with more torque at low rpm.

Next I'll have a shop fix the leaks in the exhaust and have them
reconfigure it a bit to remove a the tension when it is all together.
After that:
- an MOT in November
- refurbish the front subframe
- have a proper alignment done

I'll also be looking into starting to have the roof liner retrimmed in black.

JW

[struikie]

There is still something not quite right with engine. When the battery has
been disconnected, the engine runs nice with good torque from low revs.
As time goes by, it starts to be jerky at low revs. I guess it is making
adaptions based on sensor readings. (tried 2 different ecu's)
Perhaps I need to try 2 new lambda's?

JW

[RedV6]

Is the alternator charging correctly?
A dodgy voltage regulator in the alternator giving lower or higher output or irregular output can play havoc with the inputs to the ecu from the various sensors!

[struikie]

I'll have a look at the voltage.

JW

[struikie]

Voltage looks good. No fluctuations.

JW

[RedV6]

Ah. Pity! That might have been an easy solution, at least thats one thing eliminated!