Econoline E550 V8-7.3L DSL Turbo VIN F (2002)
Note: Do not replace the pump and IPR at the same time. If during any repair, the oil reservoir is allowed to drain it should be refilled before attempting
to restart the vehicle.
3.) Engine Starts But Has A P1211 Code
IPR% higher than expected. Stall shortly after cold start may also be a symptom. Prior to diagnosing a vehicle with a P1211, fuel pressure should
verified.
This indicates a smaller leak in the high pressure system. Using the same block off plugs described earlier to block off one bank and observing IPR%
when engine is running on each bank at similar rpms. Higher IPR% on one bank compared to the other would indicate a leak on the higher IPR% bank.
Example:
Repair as needed after locating leak as described in visual inspection in previous routing.
4.) Diagnosing P1211 With IPR% Less That 8 at Idle
ICP more than 4110 psi above command for at least 7.5 seconds can set a P1211 code. IPR with low duty cycle ( less than 8% @ idle) and engine
running, indicates a restriction in the drain circuit. This restriction is taking the place of the IPR valve, driving the IPR duty cycle lower, with higher than
expected ICP. The excess restriction will be in the reservoir, front cover, stuck IPR valve, or debris above the edge fitter. The drain path through the
reservoir and front cover can be visually verified. Typically the pump or IPR must be replaced to repair this concern. Do not replace both components at
the same time.
