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1999 Volvo S80 2.9L T6 - Misfire?
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Stryxx
Novice
Sep 16, 2019, 9:25 AM
Post #1 of 13
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1999 Volvo S80 2.9L T6 - Misfire?
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Hi everyone!
So I have an interesting Volvo here. A customer brought in their car to the shop for a check engine light.
P0300 - Random Multiple Misfires
P0304 - Cylinder 4 Misfire.
So, your probably thinking, well okay, that simply you know how to fix it. Yeah. We thought that too.
So long story short, we've replaced the spark plug, coil and injector and moved the new pieces to other cylinders to make sure the new parts work. They all do.
When you clear the codes and the let the car idle, it never misfires or throws a code. Not even at 4k RPM's.
The second you put it in drive and drive about a block it throughs the misfire codes and limp mode.
Any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 16, 2019, 10:18 AM
Post #2 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Have you done a compression test, maybe even a running compression test.
Also see what the vacuum gauge is doing at idle and 2K.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Sep 16, 2019, 10:19 AM)
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Stryxx
Novice
Sep 16, 2019, 10:40 AM
Post #3 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Yes, the compression of the cylinder was 120PSI.
I just did a drive a few minutes ago with the car on a lift and took a screen shot of some data that the snap-on scanner was reading when the light came on. Like a freeze frame since the car is not giving an actual freeze frame for me to view.
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Hammer Time
Ultimate Carjunky
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Sep 16, 2019, 10:45 AM
Post #4 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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I don't know how long the car was running but it was still in open loop at the time.
I am more interested in seeing all the compression reading to see the relationship to other cylinders.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Stryxx
Novice
Sep 16, 2019, 10:57 AM
Post #5 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Alrighty, give me a bit and I can get those readings for you and the car had been running for a 30-45 minutes. Been at the peak operating temperature for a while.
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Hammer Time
Ultimate Carjunky
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Sep 16, 2019, 11:00 AM
Post #6 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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If that's the case, you need to find out why it's not going into closed loop. Is the CTS reading accurately?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Stryxx
Novice
Sep 16, 2019, 11:32 AM
Post #7 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Truthfully, I am not entirely sure. How would I check it?
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Hammer Time
Ultimate Carjunky
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Sep 16, 2019, 11:35 AM
Post #8 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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When the engine is dead cold, compare the reading of the ECT and the IAT and they should match.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Stryxx
Novice
Sep 16, 2019, 11:39 AM
Post #9 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Got it. Want me to upload screen shots of this? (Gonna be a bit, its 100°F+ Here in Texas. Lol. 
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Hammer Time
Ultimate Carjunky
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Sep 16, 2019, 11:42 AM
Post #10 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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I don't need to see it. If they match, we rule that out.
Have you ever done a running compression test? That is very helpful to find valve issues.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Stryxx
Novice
Sep 16, 2019, 11:44 AM
Post #11 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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No, I have not tried doing that yet. Never even thought about it to be honest.
(This post was edited by Stryxx on Sep 16, 2019, 11:46 AM)
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Hammer Time
Ultimate Carjunky
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Sep 16, 2019, 11:48 AM
Post #12 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Remove the schrader valve from the tester. You should see about half of the regular compression and compare the results to good cylinders. Note how much bouncing around it does too.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Stryxx
Novice
Sep 16, 2019, 11:55 AM
Post #13 of 13
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Re: 1999 Volvo S80 2.9L T6 - Misfire?
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Alright, I'll do that as soon as the tester get here. 
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