FAQ
TL;DR: Seat Ibiza 1.6 TDI stalling/no-start often traces to low CR pressure; pump life can be 60,000 km, and "Check that there are no filings" on the rail regulator. [Elektroda, T5, post #17051794]
Why it matters: For Seat Ibiza IV 1.6 TDI owners chasing random stalls and 10‑minute no‑starts, this guides fast, accurate checks.
Quick Facts
- Observed rail pressure here: ~24,000 kPa at idle; ~57,000 kPa at 2,500 rpm; rising with RPM. [Elektroda, labuda1996, post #17042259]
- Reported fault codes: P228C00, P00C600, P008700; each flags low common‑rail/system pressure. [Elektroda, labuda1996, post #17033162]
- After a stall, cranking rail pressure logged near zero in this case. [Elektroda, labuda1996, post #17051493]
- VCDS “Extended Measurements” provides the rail‑pressure data needed for diagnosis. [Elektroda, endriu233, post #17040958]
- CR pump regulator can be removed in situ using two hex keys (5 or 6). [Elektroda, mod22, post #17056150]
What do fault codes P228C00, P00C600, and P008700 mean here?
These codes point to insufficient common‑rail pressure and a faulty control component. An expert reply summed it as "CR pressure regulating valve." Focus diagnosis on the rail pressure control and its wiring. Confirm by reading actual pressure during cranking and hot idle. Replace parts only after measurement. [Elektroda, mod22, post #17051536]
How do I check rail pressure immediately after the engine stalls?
Use your diagnostic tool to watch rail pressure while cranking. "When it goes off, check when turning what pressure the pump creates." How‑To:
- Connect VCDS, select Engine, open Measuring Blocks or Live Data.
- Log Fuel Rail Pressure (actual) during cranking for 10–15 seconds.
- Save the log for comparison against specified.
This captures the data needed for further checks. [Elektroda, endriu233, post #17034197]
What rail pressure values were observed at idle and higher RPM?
In this thread, the Ibiza logged about 24,000 kPa at idle. It rose to ~34,000 kPa at 1,500 rpm. Around 42,000 kPa at 2,000 rpm. About 57,000 kPa at 2,500 rpm. Use these values to judge trend during testing. [Elektroda, labuda1996, post #17042259]
After a stall, my cranking rail pressure is near zero. What does that indicate?
It indicates the rail is not building pressure while cranking. An expert answer in the thread pointed to the "CR pressure regulating valve." Test that valve and its connector. Inspect for contamination and mechanical sticking. Verify wiring and grounds before replacing parts. [Elektroda, mod22, post #17051536]
Where is the regulator, and can I remove it without pulling the pump?
On this engine, you can remove the CR pump’s regulator in place. Space is tight, but it is doable. Use two hex keys, size 5 or 6, as noted by a moderator. Replace the O‑ring and keep everything clean. Work on a cool engine for safety. [Elektroda, mod22, post #17056150]
I already replaced the pump control valve and it still stalls. What should I check next?
Check the rail’s pressure regulator for metal filings. "Check that there are no filings on the regulator in the rail." Finding filings suggests high‑pressure pump wear. In the 1.6 TDI, pumps have failed as early as 60,000 km. Document findings before buying more parts. [Elektroda, T5, post #17051794]
How do I inspect for metal filings on the rail regulator?
Depressurize and disconnect the battery. Remove the rail regulator carefully and inspect its screen for glitter. "Check that there are no filings on the regulator in the rail." If you see filings, stop further driving and consult a diesel specialist. Keep debris out during reassembly. [Elektroda, T5, post #17051794]
Can VCDS or a Mini VAG interface read what I need?
Yes. VCDS provides Extended Measurements that include rail pressure and related values. Use it to compare specified and actual values. This speeds diagnosis without guesswork. "If you have VCDS then you have everything described in extended measurements there." Ensure a stable connection and log while driving. [Elektroda, endriu233, post #17040958]
Could a camshaft or crankshaft position sensor cause similar stalling?
It was suggested after a valve replacement in this case. The owner reported a mechanic suspected a shaft position sensor. That idea surfaced alongside fuel pressure faults. Evaluate sensor signals if pressure appears normal in logs. Prioritize tests based on recorded data. [Elektroda, labuda1996, post #17059148]
Is uneven hot idle and throttle surge linked to fuel pressure regulation?
Yes, it aligns with unstable fuel pressure control. The owner noted a 200 rpm dip while holding 1,500 rpm. Hot idle was also uneven. Capture logs at those conditions to confirm. Address regulation and supply first. [Elektroda, labuda1996, post #17033162]
Could a past crash affect fuel pickup or delivery?
Yes. A broken guide for the in‑tank pump basket after a crash can cause erratic fueling. The basket can move and uncover the pickup. This creates intermittent starvation that mimics pressure faults. Inspect the tank module if the car had accident repairs. [Elektroda, Anonymous, post #17055548]
How long can the Ibiza refuse to restart after it dies?
In this case, it would not restart for about 10 minutes. During that period, the starter turned, and the glow lamp behaved normally. After cooling a bit, it restarted as if nothing happened. Log cranking pressure during that window for clarity. [Elektroda, labuda1996, post #17027053]
Which relay powers the in‑tank fuel pump here?
The thread author observed Relay 53 switching the pump with ignition. You may hear the pump briefly prime. Confirm by listening and checking the relay numbering. Verify your vehicle’s diagram before testing. [Elektroda, labuda1996, post #17027053]
I tried key‑cycling to prime after a filter change and only saw droplets. What now?
Do not judge by visual flow alone. Verify low‑side and rail pressure with diagnostics. "This is how you can check it with a Vag." Use VCDS live data instead of repeated key‑cycling. That avoids misinterpretation and wasted time. [Elektroda, endriu233, post #17034283]
What data should I log to accelerate diagnosis?
Log fuel rail pressure actual during the stall and cranking. Export the session to Excel or CSV for sharing. The author attached such a log when the engine died. Include timestamps and operating conditions. This enables targeted advice and next tests. [Elektroda, labuda1996, post #17051493]
Thanks in advance for your help!
