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1999 V70 odd miss

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
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mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

1999 V70 odd miss

Post by mafulcher » Mon Sep 12, 2011 7:12 pm

Hello everyone, this is my first post on this site and I have a question. I have a 99 V70 2.4 non turbo from the southern US. I bought the car with a bad engine and just replaced it with a 120,000 mile used one. I had already replaced the ETM with the XeMod with the old engine and it ran perfect minus a bad knock. Here is the problem. When I first started it with the replacement engine, it ran perfect for a while. Then the next day, I started it again and it has a miss. I pulled the injector plugs one by one and there is no change when I unplug the no. 5 cylinder. All others cause it to run worse. I have spare parts from the other engine, so I replaced the coil with no change and the plug with no change. What could cause this to miss on the 5th cylinder only after running so well when first started. Any help would be greatly appreciated.

Ozark Lee
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Year and Model: Many Volvos
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Re: 1999 V70 odd miss

Post by Ozark Lee » Mon Sep 12, 2011 10:09 pm

Welcome to MVS,

Do you have lifters clacking? If the replacement engine had been parked for a while that would not surprise me and it may just need to get run for a while to re-build the lifter oil pressure.

Any codes?

If you unplugged the #5 injector and there was no change that is where I would start - Swap out the injector from from one of them on the other engine and see what happens.

Normally with a bad injector I can use a long screwdriver and literally hear the difference but that is not always the case.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'99 V70XC - Nautic Blue
Previous:
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

Re: 1999 V70 odd miss

Post by mafulcher » Tue Sep 13, 2011 8:22 am

The lifters were clacking when first started, but now they are quiet. I forgot to say that I put another injector on it too and that did not help. I was thinking about that on my way to work today. Have not checked codes but there is no engine light on.

jblackburn
MVS Moderator
Posts: 14023
Joined: Sun Jun 08, 2008 3:54 pm
Year and Model: 1998 S70 T5
Location: Alexandria, VA
United States of America

Re: 1999 V70 odd miss

Post by jblackburn » Tue Sep 13, 2011 12:00 pm

It may be a stuck lifter or a burnt valve. I believe my next test would be to run a compression test on that cylinder.
'98 S70 T5
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

Re: 1999 V70 odd miss

Post by mafulcher » Tue Sep 13, 2011 12:29 pm

I will, then I will get back to you. Thanks

mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

Re: 1999 V70 odd miss

Post by mafulcher » Tue Sep 13, 2011 8:12 pm

compression was good in no. 5 cylinder. Still running bad. I had not put in new plugs, so I did that. I did not expect a change and there wasn't. There is still not an engine light. Checked miss by pulling injector plugs again and 1-4 cause it to stumble terrible and there is no change with no 5 just like before. Is there a way to check and see if the no 5 is getting a firing signal?

jblackburn
MVS Moderator
Posts: 14023
Joined: Sun Jun 08, 2008 3:54 pm
Year and Model: 1998 S70 T5
Location: Alexandria, VA
United States of America

Re: 1999 V70 odd miss

Post by jblackburn » Tue Sep 13, 2011 9:14 pm

Connecting a noid light to that injector plug should do that trick. The wiring for the injectors gets especially brittle over the years.
'98 S70 T5
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

Re: 1999 V70 odd miss

Post by mafulcher » Thu Sep 15, 2011 8:21 am

Well, got a noid light and injectors are firing correctly. Kindof back to square one. Really not sure what's going on.

jblackburn
MVS Moderator
Posts: 14023
Joined: Sun Jun 08, 2008 3:54 pm
Year and Model: 1998 S70 T5
Location: Alexandria, VA
United States of America

Re: 1999 V70 odd miss

Post by jblackburn » Thu Sep 15, 2011 8:23 am

Remove the plug and coil pack and ground it to the top of the engine block while the car is running. IS the plug actually firing? The wiring up there on top of the engine can get into some pretty bad shape after all these years.
'98 S70 T5
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

mafulcher
Posts: 9
Joined: Sun Jul 17, 2011 1:54 pm
Year and Model: 1999
Location: NC, USA

Re: 1999 V70 odd miss

Post by mafulcher » Thu Sep 15, 2011 12:23 pm

I will try that. But, if the noid light flashes like it's supposed to, the wiring should be ok, right.

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