1998 Audi A4 Quattro Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1998 Audi A4 Quattro
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1998 Audi A4 Quattro ProblemsNo Start after Refueling and Popping Noise from Trunk
Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:
- Succession of loud pops from rear of vehicle
- Pops go away, and fuel economy decreases
- Check engine light illuminatesT
- OBD trouble code P2404 and/or P0441 is stored
- Engine will not start after refueling (must crank for over 30 seconds)
- Vibration when slowing to a stop
The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank.
Correction of the issue is to replace the N80 valve with the latest revision.
A fluid leak may develop from the propeller shaft seal on the rear of the transmission. Our technicians tell us that replacing the seal will commonly correct this concern.
Clogged drains can allow rainwater to accumulate in the plenum tray (at the base of the windshield). The water may leak into the vehicle's interior, brake booster, or electrical components, which can lead to major problems. Our technicians recommend keeping the tray clear of leaves, pine needles, and other debris.
1998 Audi A4 Quattro QuestionsIs the torque converter the same for a 2.8 and 1.8t on the Quattro? (1 answer)
I need a torque converter for my 98 a4 with a 1.8t and I found one that was labeled for 2.8, is the torque converter the same spec for both?
Never used the back wiper on Avant Wagon. Grandchildren turned it on somewhere in car. No info in Owners Manual on it. Even my factory-trained mechanic husband (retired) couldnt figure it out. :)
I changed the timing belt, heads, and head gaskets. The car starts up and runs, but now its acting like the transmission is slipping. I've never had any problems with the transmission in the past, and no fluid leaked while working on my car.