great week and now 0633 & 0629 misfire

[Botus]

So Friday I got food poisoning which is still with me and as I reversed into a parking space at the doctors today, the car starts shuddering and I thought would stall.

its Ok at 1500 revs but at idle its pretty nasty and I have codes

0633
ML ON Misfire cyl 1 damages 3 way cat (P0301)

0629
ML ON Misfiring (P0300)

on the internet can't see these codes mean much, some saying coil pack, but wayne gates just said that's a rare one on the 5.5 v8, others saying injector and WG say that's a possibility. The way it as low revs not keen on a 20 mile trip to take it in and still rather ill so not happing this week.

Anyone got any ideas please?

 

[alexanderfoti]

First thing I would do is pull the plug and check for obvious signs of arcing or issues with the connection to the coil pack. Start with the basics.

 

[Botus]

thanks... being a knob which is cyl 1

left front (as in the one closest to the left headlamp?)

 

[alexanderfoti]

I struggle with that one too.

It should be front cylinder, on the offside (drivers side headlight)

 

[alexanderfoti]

I struggle with that one too.

It should be front cylinder, on the offside (drivers side headlight)

 

[Botus]

I struggle with that one too.

It should be front cylinder, on the offside (drivers side headlight)

bugg*r

in that case just took 5 out swapped plug to 7 and coil pack to 2
strangely I still have a misfire on cyl 1

 

[Botus]

so after cleaning and phaffing about coil pack #1 dead (now on cyl 5)

plugs look OK on all 3 cyl I checked
as far as I can see on the same 3, top of pistons all the same a bit dirty and blackish
slapped plug from #1 to #2 and coil pack from #1 to #5

misfire now on 5, interesting as WG didn't think they play up much.

in however you are meant to measure ohms.... with meter on "20" checked the 4 pins, could only get continuity on 2 (on either coil pack)
#1 7.95 (the dead one)
#5 7.70

cleared codes fired it up took a smidgen to misfire, seemed less bad, EML came on checked codes fault as above now on #5

so I need a
ZS0012
A000 150 27 80
Delphi 190005267
06T249

 

[LostKiwi]

Continuity checks at the connector only look at the primary windings. If the fault is in the secondary windings or is a weak insulator you won't see anything.

 

[alexanderfoti]

Sure looks like a dead coil.

Did you measure the resistance of a good coil? I am not sure what they should be when new.

Lots of second hand ones on ebay:

https://www.ebay.co.uk/sch/i.html?_....H0.X0001502780.TRS0&_nkw=0001502780&_sacat=0

 

[Botus]

yes, before I swapped it
#1 was 7.95 (the dead one)
#5 was 7.70 (a good one)

thanks for ebay link u found way more than I did

 

[alexanderfoti]

As per lostkiwi it only gives you part of the picture. If they are generally reliable (as per WG) I would buy a second hand one for £15.

 

[Botus]

as an interesting one.... the coil pack that gave on cyl 1

0633
ML ON Misfire cyl 1 damages 3 way cat (P0301)

0629
ML ON Misfiring (P0300)

when at the front on the other bank cyl 5 gave different codes

0637
Misfire cyl 5 damages 3 way cat (P0305)

0629
Misfiring (P0300)

 

[Botus]

as I have a main merc dealer within 1 mile of my home thought I'd go ask.

Not sold one in last 6 months, none in stock £55 each
Local parts factor £50, one in stock

but it won't match, so fleabay second-hand 2 on order for 39 quid from a 2008 car allegedly

thanks for your help guys

 

[alexanderfoti]

as an interesting one.... the coil pack that gave on cyl 1

0633
ML ON Misfire cyl 1 damages 3 way cat (P0301)

0629
ML ON Misfiring (P0300)

when at the front on the other bank cyl 5 gave different codes

0637
Misfire cyl 5 damages 3 way cat (P0305)

0629
Misfiring (P0300)

Looks like the same code to me? Last number of P030X is the cylinder number.

 

[Botus]

0633 and 0637

usually on my scanner these first 4 digits is the fault code

 

[alexanderfoti]

Ah but the ODB compliant one is the Pxxxx (for powertrain)

 

[Botus]

so my 2 second-hand coil packs rocked up. measured the resistance as per the first round and couldn't get anything conclusive

before

#1 was 7.95 (the dead one) now its at #5 with reading when completely cold of 8.13
#5 was 7.70 (a good one, lower than anything else I've measured including the broken one ???)
#6 measured for first time cold 8.15

the two new ones I got 8.30 and the other was 8.41.... but my meter was being odd and it took 10 mins before any pack gave me a reading at all !!!! so I came to conclusion the kit/method I'm using isn't helping anything,

bolted on the two later packs that claim to have come of a C350 to cylinders #5 and #6 kept the orig from 6 in the boot as a spare... fired it up all normal and drives normal, will double check if anything shows up, but I expect not as cleared it all last week and hadn't restarted since

 

[alexanderfoti]

Good result. Wish my misfires where as easy!