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1998 S70 T5 Misfire at idle, seems to go away on acceleratio

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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s70fanman
Posts: 14
Joined: 24 September 2012
Year and Model: 1998 s70 t5
Location: Gresham, Oregon

1998 S70 T5 Misfire at idle, seems to go away on acceleratio

Post by s70fanman »

Gentlemen-
This one has me at a loss, as my S70 has a definite miss at an idle and I cannot for the life of me find it. I have replaced my plugs, rotor, and bought a set of IPD blue wires, yet cannot get the raggy, feral miss at an idle stopped, I have even gone so far as cleaning my Idle Valve with chemical cleaner in the hope it was the cause.
This one pisses me off and I have to find it as DEQ is imminent as I need license plates before the end of the Month. ANY Help will be greatly appreciated.

Thanx, S70 fanman

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rspi
Posts: 7303
Joined: 5 November 2011
Year and Model: 850 T-5R Wagon
Location: Cincinnati OH
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Post by rspi »

Have you checked compression?

'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
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Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

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erikv11
Posts: 11800
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Year and Model: 850, V70, S60R, XC70
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Post by erikv11 »

Misfire or stumble at idle that goes away with throttle is often a vacuum leak. I would check all of the hoses carefully.
'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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