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Engine system service required and check engine light

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

2001 - 2007 V70
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Re: Engine system service required and check engine light

Post by scot850 » Thu Jan 07, 2016 1:44 pm

Glad you are finding your way on this.

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ADriggs26
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Re: Engine system service required and check engine light

Post by ADriggs26 » Sat Jan 09, 2016 2:08 pm

Another update: I have still not seen a BPPS code or engine system service required light so that's good. My CEL came back on and I just had them read. It is only a cylinder one misfire now. It came up twice that there was a misfire in cylinder one and those were the only codes. Now it has me thinking it could be something really bad. As I've said, I've replaced the coils, plugs, and checked the wires. Any thoughts?

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Re: Engine system service required and check engine light

Post by ADriggs26 » Mon Jan 25, 2016 10:47 am

So I never replaced my temp sensor or thermostat and I have not had a CEL since my last problem. The last code I had read was a cylinder one misfire and that was the only code. I did a fuel injector cleaner and I notice a difference but the CEL came back on today. Car runs fine and nothing seems out of the ordinary. My idle is starting to surge up and down like the ETM is failing and I have yet to replace the original on this car. I'm lost as to what the CEL could be.

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JudgeRat
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Re: Engine system service required and check engine light

Post by JudgeRat » Mon Jan 25, 2016 11:04 am

It might be worth checking to see if you have exhaust gases in your coolant; there is a small chance you have a (currently) miniscule head gasket leak on number 1 cylinder that is dripping coolant into your cylinder. You can also compare the plug condition from that cylinder to the others to maybe be able to see if you can see any difference, but the gas analysis is a more accurate indicator. Unfortunately, I have some first-hand experience with this on my 2004 s60.
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Re: Engine system service required and check engine light

Post by ADriggs26 » Mon Jan 25, 2016 11:31 am

I really hope this is not the problem. How would I go about checking for gases in my coolant?

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Re: Engine system service required and check engine light

Post by JudgeRat » Mon Jan 25, 2016 12:47 pm

ADriggs26 wrote:How would I go about checking for gases in my coolant?
Do an inter-web search for "test for exhaust gas in coolant" and you should get links for tools (under $50) to test and also some other links of discussion for diagnosing such an internal leak. I believe there might be some YouTube videos as well. You can also do a leak-down test. If this really is just a very minor leak at this time, a compression test might not be sensitive enough to give you a good indication.
"Molly" - Black 2004 2.4L i5 (non-turbo) T5 Auto FWD P2 Volvo s60 w/all options

Old-school race guy: "Brakes 1st, then steering, tires, wheels, & suspension, only then engine and drive-train. No sense making it go if you can't stop & steer properly...Safety first people!"

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Re: Engine system service required and check engine light

Post by precopster » Tue Jan 26, 2016 4:18 am

Good advice above ^^

Swap the coil from cylinder 1 to cylinder 2 and see if the misfire moves.

Were they genuine or Bosch coils?
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Re: Engine system service required and check engine light

Post by abscate » Thu Jan 28, 2016 2:37 am

After you try the coil swap, if the problem doesn't move, move the spark plugs from 1 to 2.

New plugs can be defective
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ADriggs26
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Re: Engine system service required and check engine light

Post by ADriggs26 » Fri Jan 29, 2016 1:36 pm

I've already done a coil swap and plug swap. It didn't change anything. The light has been intermittent the last few days and I take it to the dealer on Tuesday. my ideal has been weird too. When the engine is heated up to the optimal temperature, the RPM will rise and fall by several hundred RPM. It will hover around 750-800 but drops to 400 and surges to 1500 or so. I've noticed it more lately. I've cleaned MAF sensor and made sure throttle body is clean. Could this idle be part of the misfire?

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Re: Engine system service required and check engine light

Post by JudgeRat » Fri Jan 29, 2016 2:20 pm

ADriggs26 wrote:Could this idle be part of the misfire?
The misfire is more likely to be causing the idle issues than the other way around as the computer is trying to compensate.
"Molly" - Black 2004 2.4L i5 (non-turbo) T5 Auto FWD P2 Volvo s60 w/all options

Old-school race guy: "Brakes 1st, then steering, tires, wheels, & suspension, only then engine and drive-train. No sense making it go if you can't stop & steer properly...Safety first people!"

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