IPD sale XeMODeX - Experts in Volvo Electronics

Get email notification of topic replies. Log in or register (free). Amazon Link Buy anything with this and it helps MVS!

Cylinder 5 misfire on start

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Post Reply
whipperwill
Posts: 1
Joined: Fri Nov 15, 2019 4:07 pm
Year and Model: 2001 V70 XC
Location: MT

Cylinder 5 misfire on start

Post by whipperwill »

So I have a 2001 V70 XC that occasionally misfires on cylinder 5 upon startup. I replaced the coilpack and the plugs were changed 10,000 miles ago. I checked the plug and it is not fouled. The CEL will turn on and off as it will run for a while without misfiring. I replaced the battery recently as I could only get 2-3 cranks out of it before the dash would note low battery voltage. With the intermittency of this issue, I am curious if it could be a fuel injector? I saw on another thread that cylinder 5 misfire can be an intake gasket leak as well, but it only misfires for 5-10 seconds on startup on occasion. The coilpack was definitely bad as the gas mileage improved and it ran much better after replacement. Also there was a wire with the insulation that was abraded through that I patched as well. Any where else I should look?
User avatar
kallekula
Posts: 549
Joined: Sun Mar 02, 2014 12:34 pm
Year and Model: S70 2000
Location: Orange County, CA
Has thanked: 21 times
Been thanked: 25 times

Re: Cylinder 5 misfire on start

Post by kallekula »

Move injector, plug to another cylinder? Did you do a compression test? Might be an exhaust valve not sealing properly?

BMW 540i 2002
S70 Base 2000
User avatar
oragex
Posts: 5025
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 99 times
Been thanked: 297 times
Contact:

Re: Cylinder 5 misfire on start

Post by oragex »

How about the alternator ? Do you get a decent 14.5V after the engine starts ? The wires to the coils do indeed get sometimes damaged and even crushed by the small plastic engine cover. The injectors don't usually go bad on these, but who knows, maybe look at their wiring
User avatar
abscate
MVS Moderator
Posts: 22544
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 376 times
Been thanked: 1177 times

Re: Cylinder 5 misfire on start

Post by abscate »

My 1999 did this with a bad vacuum leak in the purge circuit. If it’s for 5-10 second sit might be a sticking ring or valve, some sea foam or Marvel oil treatment might unstick it.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
Post Reply
  • Similar Topics
    Replies
    Views
    Last post