T4 Missing under load

bar72 · Dec 21st, 2012, 19:38

1998 s40 T4. started giving a minor misfire under load, around 4000 rpm when gunning her the other day, nothing major. drove 26 miles tonight through a lot of water and now she's running like crap. as soon as i gun her, it's missing big time, defo only running on 3 cylinders and tick over is lumpy as hell.

is this coilpacks or just water got in about it as the floods i went through were major, one of them nearly spun me when i hit it at 50.

will coilpack show up on odbii diagnostics on the laptop?

thanks

stevo48 · Dec 21st, 2012, 19:51

Check your airbox to see if you have taken onboard any water, if you have got water in your engine it could be terminal.
If no water in airbox, replace spark plugs with genuine volvo plugs, check the coilpacks make sure there are no cracks in them and that they are clean and dry.

960kg · Dec 22nd, 2012, 09:32

^^^^^^^^

Without the water!........misfires on turbo`s under load are 98% ignition faults.

Try Volvo plugs first then coils of course checking terminal connectors for corrosion.

bar72 · Dec 22nd, 2012, 09:48

thanks stevo / 960kg! airbox [pipercross panel filter] is saturated in water, drying it out with hairdryer the now. checked coilpacks, don't appear cracked. do the 2 coilpacks supply all four cylinders, i can only see a single ht lead coming off each pack? i shall try this for now and see if this helps before sourcing plugs, skint with christmas coming up.

gmain1967 · Dec 22nd, 2012, 11:31

Quote:

Originally Posted by bar72

thanks stevo / 960kg! airbox [pipercross panel filter] is saturated in water, drying it out with hairdryer the now. checked coilpacks, don't appear cracked. do the 2 coilpacks supply all four cylinders, i can only see a single ht lead coming off each pack? i shall try this for now and see if this helps before sourcing plugs, skint with christmas coming up.

I've got a set of plugs I took off my T4 when I did plugs, leads and coilpacks at same time. They were working fine when they came off but have been in toolbox so may need gaps checked. Yours for cost of postage.

Did same for a guy from Edinburgh who used to be on forum and cured his missfire couple of years ago.

puntodan · Dec 22nd, 2012, 15:46

Usually plugs or leads but how old is the maf? I had the same issue and had lambda codes stored and a big miss on boost. Replaced the maf and no more missing and lambda codes have gone.

It could have been the water getting to it if the air filter got a soaking.

Dan

bar72 · Dec 23rd, 2012, 12:04

i'll PM you about the plugs gmain! worth a try as i don't think coilpack will be cheap. thank you for doing that!

gmain1967 · Dec 23rd, 2012, 13:57

Quote:

Originally Posted by bar72

i'll PM you about the plugs gmain! worth a try as i don't think coilpack will be cheap. thank you for doing that!

PM replied. Will try and get them out to you tomorrow...!

Cheers

Grant

Alex121 · Dec 23rd, 2012, 15:42

Usually it'll be the plugs that need swapping. This happens every now and then on my dads T4. Its fine again after swapping the sparks. He just recently had miss fire under load at around 4k revs. Just swapped the plugs today for new ones and all is fine again.

Haizum74 · Dec 23rd, 2012, 22:30

Same thing happened on my old T4, put new plugs in and sorted it.

Dec 21st, 2012, 19:38	#1
bar72 Member Last Online: Jul 27th, 2014 17:59 Join Date: Dec 2011 Location: Cupar View Photos By: bar72	T4 Missing under load 1998 s40 T4. started giving a minor misfire under load, around 4000 rpm when gunning her the other day, nothing major. drove 26 miles tonight through a lot of water and now she's running like crap. as soon as i gun her, it's missing big time, defo only running on 3 cylinders and tick over is lumpy as hell. is this coilpacks or just water got in about it as the floods i went through were major, one of them nearly spun me when i hit it at 50. will coilpack show up on odbii diagnostics on the laptop? thanks __________________ 1998 S40 T4

Dec 22nd, 2012, 09:48	#4
bar72 Member Last Online: Jul 27th, 2014 17:59 Join Date: Dec 2011 Location: Cupar View Photos By: bar72	thanks stevo / 960kg! airbox [pipercross panel filter] is saturated in water, drying it out with hairdryer the now. checked coilpacks, don't appear cracked. do the 2 coilpacks supply all four cylinders, i can only see a single ht lead coming off each pack? i shall try this for now and see if this helps before sourcing plugs, skint with christmas coming up. __________________ 1998 S40 T4

Dec 23rd, 2012, 12:04	#7
bar72 Member Last Online: Jul 27th, 2014 17:59 Join Date: Dec 2011 Location: Cupar View Photos By: bar72	i'll PM you about the plugs gmain! worth a try as i don't think coilpack will be cheap. thank you for doing that! __________________ 1998 S40 T4

Dec 23rd, 2012, 22:30	#10
Haizum74 Master Member Last Online: May 19th, 2024 15:12 Join Date: Mar 2012 Location: York/Selby	Same thing happened on my old T4, put new plugs in and sorted it. __________________ '08 V50 2.0D

Dec 21st, 2012, 19:51	#2
stevo48 Premier Member Last Online: Jul 9th, 2020 20:08 Join Date: Dec 2007 Location: Halifax West yorkshire	Check your airbox to see if you have taken onboard any water, if you have got water in your engine it could be terminal. If no water in airbox, replace spark plugs with genuine volvo plugs, check the coilpacks make sure there are no cracks in them and that they are clean and dry.

Dec 22nd, 2012, 09:32	#3
960kg Premier Member Last Online: Dec 28th, 2022 12:25 Join Date: Jun 2009 Location: Mercville	^^^^^^^^ Without the water!........misfires on turbo`s under load are 98% ignition faults. Try Volvo plugs first then coils of course checking terminal connectors for corrosion.

Dec 22nd, 2012, 15:46	#6
puntodan Master Member Last Online: Sep 25th, 2019 17:16 Join Date: Oct 2010 Location: Surrey	Usually plugs or leads but how old is the maf? I had the same issue and had lambda codes stored and a big miss on boost. Replaced the maf and no more missing and lambda codes have gone. It could have been the water getting to it if the air filter got a soaking. Dan

Dec 23rd, 2012, 15:42	#9
Alex121 Premier Member Last Online: Oct 27th, 2020 10:45 Join Date: Nov 2011 Location: -	Usually it'll be the plugs that need swapping. This happens every now and then on my dads T4. Its fine again after swapping the sparks. He just recently had miss fire under load at around 4k revs. Just swapped the plugs today for new ones and all is fine again.

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