Jaguar S Type Cold Start Issues Point to Faulty Injector

Had the same symptoms on my Jaguar XJ6 2004 diesel last winter. The rough idle and hard starting problems pointed directly to injector issues. Initial injector test confirmed two injectors were not atomizing fuel properly, causing inconsistent spray patterns. The fuel rail had to be removed to access all injectors. Complete diagnosis revealed carbon buildup was preventing proper fuel delivery during cold starts. This explained the terrible cold running and starting difficulties. This was definitely a serious issue requiring immediate attention, as faulty injectors can lead to increased fuel consumption and potential engine damage if left unchecked. Professional injector cleaning did not resolve the issue in my case, ultimately requiring replacement of the problematic injectors. The repair significantly improved cold starting performance and eliminated the rough idle completely. Worth noting that proper diagnostic testing using specialized equipment is crucial, general fault code readings alone are not enough to pinpoint injector problems accurately. Would strongly recommend getting a proper injector test done to verify your suspicions. These symptoms typically worsen over time and can lead to more extensive engine problems if not addressed.

Thanks for sharing your experience. The symptoms you described match exactly what I dealt with last year. The engine misfire during cold starts was really frustrating, and the fuel delivery issues only got worse over time. My mechanic also found carbon deposits affecting the fuel rail and injectors. The problem was fixed with a full injector service and replacement of two faulty units. Would you mind sharing what you paid for the complete repair? Just wondering if costs have changed since then. Also curious if youve had any fuel system problems pop up since the fix?

Glad to help clarify the costs. The injector replacement solved the hard starting and rough idle issues completely. Total repair came to 515€, which included the new injector, labor, and system testing. The engine misfire symptoms disappeared right after fixing the faulty cold start injector. No fuel system problems have occurred since the repair was done. The investment was worth it considering how smoothly the engine runs now, especially during cold starts. The thorough injector test the shop performed was key to identifying the exact problem. They showed me how the original injector was creating irregular spray patterns, which explained the poor fuel delivery during cold starts. For anyone facing similar symptoms, getting a professional diagnostic test is crucial since fuel injection issues tend to worsen if left unaddressed.

After months of dealing with those cold start problems, I finally got it sorted. Took it to a specialist shop for a proper fuel system diagnosis. The mechanic showed me the spray test results, two injectors were definitely shot. Bill came to 780€ total, steeper than expected but included full injector replacement, system cleaning, and testing. The shop even demonstrated the before/after spray patterns to show why the engine had been running so rough. Six months later and the engine fires up perfectly every morning. No more hard starting or rough idle issues. The fuel delivery is spot on now, and the engine runs smoother than it has in years. Should have done this repair much sooner instead of waiting and hoping it would improve. Looking back, getting that proper injector test done was crucial. Trying to diagnose it through basic code readings would have been a waste of time and money.