Yugo L4-1300cc 1.3L (1991)
If all pressures at stall are high, then look at the idle pressures. If the idle pressures are also high then this could be a pressure regulator or throttle system
problem. If idle pressures are normal then the problem is in just the throttle system.
The reverse stall test is also a maximum pump output test. If you suspect a weak pump then this test will help find it. Often this will show up as low
pressure at reverse stall but all other pressures including idle will be normal. If a person wanted to become really proficient with a pressure gauge they
should first put a pressure gauge on their own vehicle and leave it there for exactly one week. Every time they drive the car they should watch the gauge.
After one week, they should then put the pressure gauge on every single car in the shop that DOES NOT have a problem. Don't use the gauge on cars
WITH problems yet. After 30 days of using a gauge on units that work properly, they can then start using the gauge on units with problems. The
technician is accustomed to normal readings, abnormal readings will stand out like a sore thumb.
To fix today's transmissions, every professional technician must be proficient in the use of a pressure gauge. The only way to gain this proficiency is to
use the pressure gauge daily. Practice makes perfect.
