Poor starting, especially when cold (B27/B28 with K-Jetronic)
Symptoms
The V6 is reluctant to start when cold, runs rough for a few minutes, or won't start at all. Once warm it's usually better.
Cause
The Bosch K-Jetronic continuous injection system relies on vacuum-operated components, precise fuel pressure, and a functioning cold start system. The cold start injector (a sixth injector) often fails, the thermo-time switch stops working, and the warm-up regulator sticks. Vacuum leaks are endemic on old engines.
Fix
Check fuel pressure at the distributor, should be around 72-77 psi with the engine running, dropping to about 50 psi when the engine is off.
Test the cold start injector by removing it and checking for spray during cranking (it should spray for a few seconds then stop).
Replace the thermo-time switch if faulty.
Hunt down vacuum leaks with a smoke machine or by spraying carb cleaner around suspect areas.
The K-Jetronic system can be fiddly; if you're not confident, find someone who knows these systems.
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