pekwah1
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| posted on 25/5/25 at 04:50 PM |
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Fuel checks
Hi guys,
Still having issues with my car running.
It’s misfiring and feeling like it’s only running on 3 cyls.
It’s a 2.0 blacktop running on standard ECU.
I’ve replaced ignition (coil, leads, plugs), check and cleaned injectors, filters and fuel lines.
Ive got a standard FPR (7988f-9c968) which I’ve just replaced.
LP fuel pump feeding the swirl pot and then HP pump is an Osias pump with the below specs.
Flow rate - 135ltr/hr @ 3bar (35 gal/hr @ 45 psi)
Max pressure - 8.5bar (125 psi)
Does that look ok for the zetec?
Thanks
Andy
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rusty nuts
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| posted on 26/5/25 at 04:29 PM |
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Do a cylinder leakage test, way better than a compression test , I once had a silver top Zetec with a misfire that showed good compressions but a
leakage test showed a leaking inlet valve. Check the valve clearances , black tops use different size cam followers to adjust clearances .if you have
any that are tight it can cause problems . Can you identify which cylinder has the misfire? Try swapping the plug for one in a good cylinder, change
that lead and maybe swap the injector for one from a good cylinder. Modern plugs don’t like getting wet so they can misfire even if new. What make
spark plugs?
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pekwah1
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| posted on 26/5/25 at 06:04 PM |
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Thanks for the reply, I’ve been back out in the garage and actually think I may have found the issue - one of the injectors is allowing air/liquid
through without it being activated, so looks like a faulty solenoid…
I’ll have to get another injector ordered and hopefully sorts the problem.
Cheers
Andy
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