Suzuki SX4 - Intermittent misfires.

Honest John Back Room » Technical matters
View Threaded
Sun 17 Mar 2019 18:03
Suzuki SX4 - Intermittent misfires. - TrevL

I would appreciate any comments from the experts on this site about a minor issue I have on my Suzuki SX4 1.6. The problem is intermittent misfires on C 3 (fault code 0303). I initially thought it was the coil pack as there was a similar issue some time ago on one of the others that was fixed by a new pack. The issue occurs at irregular intervals and often just causes the engine warning light to flicker but not go firm, 0303 is there when I put the scanner on. The only way I can create the issue (sometimes!) is to try to accelerate in 5th on a gradient that gives uneven running for a short time. It could be a plug/lead issue I expect and I’ll see my excellent local mechanic in the next couple of days and no doubt he’ll have some ideas but I thought some of the gurus on here may have seen a similar issue. Many thanks. T

Reply | Report as offensive | Link
Sun 17 Mar 2019 18:54
Suzuki SX4 - Intermittent misfires. - elekie&a/c doctor

Is this running 2 coils with 2 ht outputs per coil?

Reply | Report as offensive | Link
Sun 17 Mar 2019 20:44
Suzuki SX4 - Intermittent misfires. - TrevL

Thanks for your response, yes two coil packs.

Reply | Report as offensive | Link
Sun 17 Mar 2019 21:53
Suzuki SX4 - Intermittent misfires. - elekie&a/c doctor
This uses a wasted spark system where it fires 2 cylinders at once. Your misfire could be one of the ht leads . Probably best to change both.
Reply | Report as offensive | Link
Sun 17 Mar 2019 23:45
Suzuki SX4 - Intermittent misfires. - TrevL

Thanks very much for advice. I'm taking the vehicle to my local mechanic tomorrow and I'm sure he will appreciate the comments, like a lot of local specialists he has a network of contacts who share knowledge so a pointer is always welcome. I'll let you know the outcome. Thanks, T.

Reply | Report as offensive | Link
Mon 18 Mar 2019 21:01
Suzuki SX4 - Intermittent misfires. - TrevL

elekie&a/c doctor, Update. Took the vehicle to my mate the mechanic this morning and his plan was to look where you suggested,he did and confirmed HT lead issues, he is going to replace all four whilst he is on the job. Thanks again for your prompt assistance. Rgds, T.

Reply | Report as offensive | Link
Mon 25 Mar 2019 21:38
Suzuki SX4 - Intermittent misfires. - TrevL

elekie&a/c doctor, Thanks again for your help, just to confirm final outcome, both HT leads replaced, and new plugs that should probably have been changed a while ago, and all now OK. T.

Reply | Report as offensive | Link

From which small car to buy at which price point to the best UK-built cars, our Top 10s have the lot. Click now for your shortlist.

Unsure of what to buy? Our Top 10s are here to help you....