As above getting bad misfires under load & P0304 code (misfire cyl 4). Swapped coil pack 4 with 3 still getting P0304 which would suggest coil ok. Any ideas?? 4 new NGK plugs fitted last week. Have checked the large connecting blocks on bulkhead - looked clean & gave em a quick squirt of WD40
Checked compression all between 260 - 280psi, cyl 4 one of the highest. Took out all the plugs - they were blacker than ideal, cleaned them all, replaced in different positions.
The car is still running poorly - very lumpy & misfiring/blowing when put under load (i.e going up hill) however on a gentle downwards slope it revved cleanly through the gears to 5500 rpm. Just done a 10 mile test run but couldn't get any fault codes up despite the misfire.
Is richjts's car still running trouble free? I took that connector apart the other day having read his thread but it all looked spotless so I gave it a squirt of wd40 & put it back together. The frustration with this type of problem is that it can go away for a few 100miles then come back. Lots of threads on here with similar problems but loads of different solutions!
Just been on a short run, it started to misfire again & the warning message flashed up. Hooked up the laptop & again its P0304 misfire cylinder 4 despite changing plugs & swapping coils.
If you've got compression and you've got spark (test spark plug out of cylinder) it can only be injectors really.
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