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Marry Christmas everyone
well it must be Christmas time again
Another holiday break with out car
as my s type R is in paint shop getting new paint job
2004 4.2 n/a wifes car
a couple of weeks ago my wife was driving when she got restricted Performance light So she brought car home and I put scanner on got the following codes
I have I carsoft CR PRO scanner dont really know if it any good
P1646 SENSOR UP STREAM BANK 1
P1647 SENSOR UP STREAM BANK 2
P0302 MISFIRE CYLINDER 2
So I ended up purchasing from jaguar new Zealand four 02 sensors 2 up stream 2 down stream
at $850.00 each had no choice as no one else in New Zealand had any yes it brought me to tears
After replacing 4 02 sensors
Let car idle for a couple of minutes but was not happy
So decided to check plugs
and did a leak down test which was fine since engine has only done 2000 km since rebuild
This is where my nightmare begins
When removing coils the silicone boots stayed on the plugs
Have found out since the new coils I purchased from a seller on website similar to ebay called trade me in new Zealand were cheep Chinese crap even though listing said ome
so I ended up purchasing a new set from Australia brand swan
so new 02 sensors and coils
plugs 6 mouths old
Took car for drive
Went like a bag of crap got restricted Performance light
started misfiring
Where i live i have to go up hill to get to drive way
Well car hardly made it up the hill even with foot flat to floor
My lawn mower had more power than car
So put on scanner got the following
photo one plugs on bank one 1 3 5 7 all like this
Photo 2 plugs on bank two 2 4 8 all like this
Photo 3 plug 6
it is stated to do my head in now
Any suggestions would be appreciated
Thanking you
First thing I noticed is you gained extra faults after changing all those parts. You went from a single cylinder misfire (low power*) to four, all on the same bank.
What would affect all four cylinders on one bank but not the other? Considering you just replaced the O2 sensors, I'd suggest swapping the two upstream sensors and see if the fault follows to the other bank. You may have got a new sensor bad from stock, or there was a problem with the connection. Revisit all recent work, swap the two sensors, and see what happens.
Before reading the soapbox mode footnote, it's best to hum along to the following song for maximum effect:
* [Soapbox mode] If the computer has set a misfire code, please be aware "misfire" wasn't the best terminology that could have been used. Misfire sounds like an ignition problem, at least to me, meaning the fuel and compression were there, but for whatever reason, the required spark was missing or weak. This might lead an aspiring mechanic to troubleshoot the daylights out of a perfectly good ignition system. I do not care to discuss how I know this.
In OBD-speak, misfire simply means one or more cylinders is putting out low power compared to the others. Pretty much anything affecting the output of a cylinder can set a misfire code. It can be low compression. It can be a valve not opening fully. It could be a clogged fuel injector. And yes, it could be an ignition problem, too, but don't overlook the other possibilities, too.
[Soapbox mode off/]
Good advice from Karl! But I do feel for you if the O2 sensors are $850 EACH! WOW!
I replaced 2 O2 sensors on my XJR and they were Denso as factory and were about $65 each which I thought was expensive.
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One more thought on why 4 coils on one bank are now misbehaving: All 8 coils receive power from a common source. The harness branches off to the left and right banks. If one of your new coils was drawing a moderate amount of excess power, it could draw down the available power for the remaining 3 coils on that branch of the harness. If this excess current draw was too much, you might get some kind of specific message other than just a generic misfire. But it's possible to draw just the right amount and affect the other coils on that branch without generating a specific message.
Am I out in left field again? Certainly possible, but easy to rule out. Won't cost anything but a little bit of your time. Try swapping all coils between the left and right banks. If the fault follows, you'd know one of those coils was behaving as described. After that, it would be a little more work to isolate which coil was at fault, but we can walk you through those steps if needed.
One more thought on why 4 coils on one bank are now misbehaving: All 8 coils receive power from a common source. The harness branches off to the left and right banks. If one of your new coils was drawing a moderate amount of excess power, it could draw down the available power for the remaining 3 coils on that branch of the harness. If this excess current draw was too much, you might get some kind of specific message other than just a generic misfire. But it's possible to draw just the right amount and affect the other coils on that branch without generating a specific message.
Am I out in left field again? Certainly possible, but easy to rule out. Won't cost anything but a little bit of your time. Try swapping all coils between the left and right banks. If the fault follows, you'd know one of those coils was behaving as described. After that, it would be a little more work to isolate which coil was at fault, but we can walk you through those steps if needed.
Hello I have swapped pre cat 02 sensors around
coils and also new plugs
have now just replaced 8 fuel injectors
Done compression test
Leak down test
All great
Only this now is could be a bad catalytic converter
Here i go again
