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Persistent misfire Topic is solved

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.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70, V70 AWD
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1997 - 2004 C70

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Re: Persistent misfire

Post by shegarty » Wed May 08, 2019 6:29 am

Thanks for all the suggestions ... upon even further investigation it appears to be an intake gasket failure at cylinder #1, and possibly a leak around the aforementioned vacuum elbow. I'll know more once I get the intake removed. Parts are on order but since I live in the great white north it will be a week or so before they get here - we seriously need a better option for decent parts in Canada.
current - 98 S70 T5 SE (255k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)

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Re: Persistent misfire

Post by abscate » Wed May 08, 2019 7:27 am

RickHaleParker wrote:
Tue May 07, 2019 4:19 pm
I missed the '98.

Could be a intake manifold gasket leak at #1. Fire it up and spray some starting fluid around intake manifold port #1. If there is a intake manifold gasket leak at #1, it will suck in starting fluid and you will hear the engine surge. If it does surge, let it scare you and back off on the starting fluid.

Lower compression at #1 could be the cause also.
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