2001 S40 1.9L Turbo misfire query RESOLVED!

drk5184 · Post by **drk5184** » 04 Feb 2008, 19:54

I am trying to track down the cause of a couple of misfire faults that I'm getting on my S40....I've got a little diagram as a PDF but I can't upload it so I'll do my best to explain what has happened in words.

I was getting a cylinder 1 and a cylinder 3 misfire fault from the computer. The car was also "chugging" at high revs (full throttle) but seemed fine at low revs.

I swapped the ignition modules (cylinder 3 to 4 and cylinder 4 to 3) and tested it again...this time I got a cylinder 1 and a cylinder 2 misfire fault.

I checked to make sure the plugs were all tight and I also greased the electrical connections to make sure that they were tight...I did notice, however, that the boot in cylinder 2 is discoloured (a "baked" light brown rather than the usual light grey).

Can anyone offer advice on where to go next.

Incidentally, I've posted a few times in the past 48 hours and I've received excellent (and quick) help so...thanks![/b]

Post by **MadeInJapan** » 04 Feb 2008, 20:53

You might have bad wires. Doesn't your car have ignition coil packs with 2 packs? 1 and 4 are shared by one pack and 2 and 3 are shared by the other? Like the diagram I posted on your other question. In other words, you can't just swap around the coil packs inadvertently. 1&4 are always connected as are 2&3.

drk5184 · Post by **drk5184** » 04 Feb 2008, 21:53

1 and 4 are shared by one pack and 2 and 3 are shared by the other...In other words, you can't just swap around the coil packs inadvertently.

When I swapped the position of the 2 coil packs I did not change the location of the wires (only the coils were changed) so 1 and 4 were connected and 2 and 3 were connected.

Post by **MadeInJapan** » 04 Feb 2008, 22:04

Ok, now I understand. I would say bad wires even though the coil packs might be ok. Do you have any friends with the same car that you can "borrow" their wires from and test again? I'm thinking that #1 is the bad one but why #2 also, I don't know.

seanq1016 · Post by **seanq1016** » 12 Feb 2008, 12:21

went to diffrent shops spent too much money to find out after readin a post on this site by cstem posted last year on may/7/07 i decided to try to replace my coils and it fixed the problem throttle responce and preformance was 110% better after the swap i really didnt know this car could run this well even the stealership didnt find or think of the coils being bad and tried to talk me into that i need a lot of expensive work to fix the issue i think ill take the car back today and let them drive it again so mabey they wont rip the next guy off and the repair is simple to do on your own pot i got the idea from was *** UPDATE*** V40 jerking,hesitation and SES under hard accel check it out hopefully it helps

Post by **MadeInJapan** » 12 Feb 2008, 15:33

Thanks for the great resolution. It's always good to read that problems are solved here!