Hello again Chris - thank you for your reply..
My apologies that I couldn't get back to you sooner today..
Okay.. throttle body wouldn't cause cylinder specific misfire Chris.. you (they) need to find out if its is cylinder specific.. that would narrow things down altogether..
The best way to do that is with a compression test... that will tell for sure if there is a piston , cylinder or valve problem.. so that has to be the next step to ID that for sure one way or the other , then you can progress from there..
SO you need to rule out - or find any engine mechanical problems via testing as above first ..
After that - if there are none.. then there are several possibilities that would cause a misfire..
These include air in the fuel, fuel pump problems, filter... fuel rail pressure sensor, fuel rail control valve, fuel quantity adjuster - high pressure fuel pump and lastly, electrical wiring / connection problems..
There's been no mention of any proper diagnostic testing having been carried out Chris - I know there is no MIL on.. but one, make sure the MIL works as a first step.. then general fault code read should always be done regardless of MIL ..and go from there.. fault code directed if present... If none - then other, Live Data tests should be done, inc fuel pressure tests etc..
From what you have said Chris, it does sound as though none of this has been done.. It needs to be - guessing can be expensive for you... ie, replace engine.. very
expensive and very much over kill at this stage..
If the garage doesn't have the equipment as above Chris - you need to move it to a garage that has - to be able to do all the testing as above...and then you will get to the bottom of it ..
have a piston / engine issue as they have said - but that does seem to have been a bit jumped at from what you have said they have done / not done..
Follow through on the above Chris and you will get there with it - let me know if I can help anymore at all..
Best Rgds. MIKE..
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