Misfired!

[Theflyingpostman]

In my Citroën AX 1.5D 1995 with 67000 miles on the clock, I felt few misfired after 2,500rpm. Which it never happens before, the new glow plugs did not solve. I changed new fuel filter nothing better still misfired, now it misfired more above 3,500rpm the engine shake!
I felt it could be the injectors blocked, I bought injectors cleaner mix with super diesel from Shell hope it cleans up, with 3 weeks and 300 miles later, still misfired not much as before I reckon the injectors are blocked. Not only that, but I took off each injector a time and turn over the engine, I see all four injectors spray fine mist, I felt it must be the pump, the Bosch pump need expert to do recondition, the issue I don't know which one company could do this.

It would be very helpful if anyone suggest which injectors specialist in UK?

[PaulC5]

If you have not had a diagnostic done, I would do that first before spending money on a fuel pump repair.

[CitroJim]

If you have not had a diagnostic done, I would do that first before spending money on a fuel pump repair.

It's all mechanical on these Paul so no ability to do laptop-based diagnostics.

What pump is fitted to yours Flying Postman? Lucas or Bosch?

[Theflyingpostman]

If you have not had a diagnostic done, I would do that first before spending money on a fuel pump repair.

It's all mechanical on these Paul so no ability to do laptop-based diagnostics.

What pump is fitted to yours Flying Postman? Lucas or Bosch?

My VIN shows my is Bosch VE not Lucas. I have learned it misfire more when it is cold till warmer, less misfire still ain't right. See my picture.

My buddy said he thinks the pump lose the pressure when it becomes high revs. Unliked the injectors.

[Theflyingpostman]

I find that Frechforum isn't very helpful now when people try to help, then suddenly nothing. I looked another people who have more years with forum than me, always get the lot of answers. How do I deactivate my account?

[CitroJim]

Sorry to hear that.. I must admit life often gets in the way with me and I'd taken my eye off the ball with this one...

Very unlikely to be a pump problem par-se. Much more likely to be a fuel delivery problem to the pump.

Check your leak-off pipes for damage/perishing and replace if at all suspect, including the blanking cap on the last injector. Also, check for air leaks around the fuel filter. Temporarily replace the pipe between filter and pump with a clear one and look for air bubbles - there should be none.

Finally, check the fuel pickup strainer in the tank. It may be partially clogged.