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Misfire after jump start/drained battery

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

chrisinthecouv
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Joined: Fri Nov 11, 2016 12:34 pm
Year and Model: 2001 s40
Location: Vancouver, Wa
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chrisinthecouv

Misfire after jump start/drained battery

Post by chrisinthecouv » Fri Nov 11, 2016 12:50 pm

Here is a run-down of the how my s40 got to where it is:
- Car was starting/running fine - no issues
- Used s40 to jumpstart another car I was looking to buy. Accidentally crossed the jumper cables on the car I was jumping. Completely drained the battery on my s40. Was able to jump start the s40 and get it running. Didn't appear to be any problems.
-The next few days the battery had a difficult time holding a charge. I had to put it on the charger several times. After a few attempts it was mostly charged.
- Then it suddenly started becoming difficult to start and running poorly. It feels like it has a serious misfire. Sometimes it will start, and if it does, it runs terrible.
- I pulled each plug and each one had spark. Plugs could use a change. Been a few years...
- I could smell gas on the plugs and coming from the cylinders so I'm assuming I'm getting enough gas.
- I did a quick check of fuses and relays and didn't see anything that appears blown.

What could be causing the starting difficulties and misfire? Did I fry something when I hooked the cable up wrong? Coil packs? Relay? Other?

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alschnertz
Posts: 624
Joined: Fri Apr 29, 2011 9:25 am
Year and Model: 1995 854T
Location: Connecticut
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alschnertz

Re: Misfire after jump start/drained battery

Post by alschnertz » Fri Nov 11, 2016 2:24 pm

Try a different battery.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

chrisinthecouv
Posts: 2
Joined: Fri Nov 11, 2016 12:34 pm
Year and Model: 2001 s40
Location: Vancouver, Wa
Has thanked: 0
Been thanked: 0
United States of America
chrisinthecouv

Re: Misfire after jump start/drained battery

Post by chrisinthecouv » Sat Nov 12, 2016 8:42 am

I changed out the spark plugs. Was able to get the car started. Here is what I noticed:
- engine still misfiring/running rough
- oil is becoming milky/tan looking. Some small air bubbles appearing.
- heavy steam coming from the exhaust.

Looks like I have a blown head gasket to fix. I have a Haynes manual for the car, but would also like other advice. Can someone point me to a post for this, or give me pointers?

thx!!

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alschnertz
Posts: 624
Joined: Fri Apr 29, 2011 9:25 am
Year and Model: 1995 854T
Location: Connecticut
Has thanked: 1 time
Been thanked: 9 times
United States of America
alschnertz

Re: Misfire after jump start/drained battery

Post by alschnertz » Sun Nov 13, 2016 4:43 am

Wow, a blown head gasket from crossing the jumper cables. That's a new one.

I've found the S40 Haynes manual to be ok. Not great, but at least it's something.
Last I checked (maybe 1-1/2 years ago) it was the only repair manual available.
Search will be your friend. You can also search that repair on the 5-cylinder models of that era. It's a very similar engine.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

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