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1999 S70 NA PCV system fix caused misfire

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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kyalami321
Posts: 13
Joined: 21 July 2015
Year and Model: 1999 S70
Location: Miami

Re: 1999 S70 NA PCV system fix caused misfire

Post by kyalami321 »

Ok, finally fixed and it was the stupidest - yet cheapest - thing ever ... the coil wires were hooked to the wrong cylinders. Thank you all for your help regardless.
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erikv11
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Post by erikv11 »

Awesome that you posted up the solution, thank you, it really helps. Trust me, you will by far not be the only one of us to make that miscue!
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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abscate
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Post by abscate »

Way to go. Label them with some white tape so the next time this doesn't happen.
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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misha
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Post by misha »

kyalami321 wrote:Ok, finally fixed and it was the stupidest - yet cheapest - thing ever ... the coil wires were hooked to the wrong cylinders. Thank you all for your help regardless.
You allready had been pointed into that direction:

Sommerfeldt wrote:...Anyway - just to rule out the absolutely most basic thing that could cause your troubles... You're sure that you put coils and plug wires back in the right order...?

- S
8)
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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kyalami321
Posts: 13
Joined: 21 July 2015
Year and Model: 1999 S70
Location: Miami

Post by kyalami321 »

misha wrote:
kyalami321 wrote:Ok, finally fixed and it was the stupidest - yet cheapest - thing ever ... the coil wires were hooked to the wrong cylinders. Thank you all for your help regardless.
You allready had been pointed into that direction:

Sommerfeldt wrote:...Anyway - just to rule out the absolutely most basic thing that could cause your troubles... You're sure that you put coils and plug wires back in the right order...?

- S
8)
Yup, I was. I didn't even consider that "order" meant specific wires tied to specific cylinders, but now I won't forget. Timing belt or suspension work will be my next projects. Thanks!
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abscate
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Post by abscate »

Remember an ME7 doesn't have cap rotor and wires - just plugs that attach to coil-on-plugs

I bet someone has tinkered with the wiring looms as on my 1999 you can't get the plugs into the wrong coils without really straining them.
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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Sommerfeldt
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Post by Sommerfeldt »

abscate wrote:Remember an ME7 doesn't have cap rotor and wires - just plugs that attach to coil-on-plugs

I bet someone has tinkered with the wiring looms as on my 1999 you can't get the plugs into the wrong coils without really straining them.
I kinda see what you mean, abscate, but if I remember correctly, it's possible to mess it up if you route the cables wrong between the coils. 3 & 4, for example.

Anyway, it's good that the battery mishap didn't screw anything up, kyalami. :) And whenever the solution is the cheapest one, then that counts as a good day. :D

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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