Idle Stabilizer, Checking

Idle stabilizer, checking

Work sequence

If engine is difficult to start, does not start, or engine misfires/cuts out, proceed as follows:
- Disconnect both wire plugs from idle stabilizer and connect them together
If engine starting troubles are eliminated:

- Check contact pins and sockets of both idle stabilizer connectors for correct position or damage
If OK: idle stabilizer unit must be defective; replace

- Connect V.A.G. 1 315A tester, SUN "VAT-40 or equivalent according to manufacturer's instructions
- Apply parking brake

WARNING: No one should be allowed to stand in front of vehicle during this test. Vehicle's wheels must be blocked

Vehicles with manual transmission

- Apply foot brake
- Start and accelerate engine (i.e. to 2500-3000 rpm) briefly
- Let engine idle and notice ignition timing
- Select 4th gear and slowly engage clutch
As engine speed drops below 940 rpm ignition timing must move in direction "advance"

- If not, replace idle stabilizer

Vehicles with automatic transmission

- Apply foot brake
- Start and allow engine to warm up until idle speed drops below 1000 rpm
- Switch ON all electrical consumers including air conditioner (if equipped)
- Let engine idle and notice ignition timing
- Place selector lever in a speed range
As engine speed drops below 940 rpm, ignition timing must move in direction "advance"

- If not, replace idle stabilizer