Occasional misfire - thoughts?

P

paulgs1000

Elite
 Newcastle upon Tyne
Talk about bad timing - just when we're due for a hoon on Sunday my 3.0si has just started to produce a very occasional misfire. :|

Started yesterday - slight stutter for half a second at low revs as I set off from home (2nd gear). Then noticed at speed on a dual carriageway - just a couple of interruptions for a 3rd of a second. No warning lights on. . .

Went to see my Indy for advice - he recommend I continue to run the car as the warning lights won't show until there has been a more sustained period of engine disruption at which point the coding will make diagnosis clearer.

Today Steph had 3 interruptions each for about half a second. No warning lights.

The Zed has been faultless at all other times. Still no engine or management light. . .

The Zed is an AUC and has a year's warranty (bought Jan this year). Any thoughts/suggestions? Can't get it sorted for sure until I get a warning light and coding - likely a rogue plug? Coil? I think I will take the Zed on the hoon - it may throw up the coding I need. Any other time this wouldn't be such an annoyance.

:driving: :thumbsup:
 
Yeah paul couldn't have came at a worse time. Mine goes in tomorrow just for a check up my engine light come on couple of weeks ago but has since gone out, I am getting the odd misfire every now and again around 30mph in 3 gear could be ignition coil. Won't be able to do the work till next week but am still out on Sunday.
 
MAF? You can run without and see if problem occurs then. I had similar isue with Porsche. Hard to reproduce fault to order so diagnosis difficult.
 
Had exact same issue. Took it to bmw and they said a misfire was logged on the faults but after looking everywhere nothinv could be found as a problem. They just said they popped some redex equivalent in the tank. Haven't had any issues yet.

Sent from my GT-I9300 using Tapatalk
 
Going to top the tank with Super and an additive - see if it helps.

Sunday's hoon should elicit the engine /management light if there is a malfunctioning coil or plug. . . .

We shall see. :?

:driving: :thumbsup:
 
Chezsherman said:
Yeah paul couldn't have came at a worse time. Mine goes in tomorrow just for a check up my engine light come on couple of weeks ago but has since gone out, I am getting the odd misfire every now and again around 30mph in 3 gear could be ignition coil. Won't be able to do the work till next week but am still out on Sunday.
Click to expand...

Err - still out on Sunday as 'going to be there' or out as in 'not coming' ? :?

:driving: :thumbsup:
 
You must log in or register to reply here.
Back
Top Bottom