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1998 V70R Random 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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Mriv1998
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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Fri May 15, 2020 12:57 pm

Update: just got the car back from the shop and they didn’t kill me on the labor for the PCV. They took it for a thorough drive and looked over everything and told me the injector on cylinder one needs replacement. No big deal considering the age however being that it’s an R he told me he couldn’t find the right injector. Do any of you guys know where I can source one I already checked IPD and no luck. Also is it worth replacing all four or just one bc I know they can be pricey

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Re: 1998 V70R Random Misfire

Post by misha » Fri May 15, 2020 1:00 pm

I doubt that it's the source of your problems but you can send all 5 to a professional ultrasonic cleaning and flow check.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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'71 144 S
'73 144 De Luxe
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'78 244 DL
'79 244 GLE
'85 340 GLS

Mriv1998
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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Fri May 15, 2020 2:13 pm

He said that he thinks it’s the electronic portion of the injector not that it needs to be cleaned since I’ve already tried Techron twice. I’m really not sure guys I guess I will order the crank sensor and start with that it’s just confusing to me that a bad one would cause the misfire on a single cylinder

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Re: 1998 V70R Random Misfire

Post by scot850 » Fri May 15, 2020 3:53 pm

The injectors have a little filter in the top of them, as well as O ring seals. The seals fail with age letting air in. As you have used a 'decongestant' in the fuel it could also be a clogged injector. If there is a company that cleans and checks injectors they may have a source of replacements should they find a bad one when testing.

I have been able to buy replacement 'O' rings, the small filters (be aware there are 2 lengths. The short ones fit both but the long ones don't fit the ones fitted with short ones). Typically the pintle ring will break as they go brittle with age and you have to ease the 'O' rings over them. Again I was able to get a better newer design like a small frisbee with a central hole. There was a great helpful guy on Ebay called Martin Diaz who knew his stuff on these injectors. Can't recall if his company went by Diazmotorsport or something like that.

Neil.
2000 V70 R - still being an endless PITA
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2003 Toyota 4Runner V8 Limited
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1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Fri May 15, 2020 5:11 pm

Super helpful information thanks I think I have a good starting spot now with the cleaning and the sensor

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Re: 1998 V70R Random Misfire

Post by fitz548 » Sat May 16, 2020 2:27 pm

Hey whats up yes the injectors can cause misfires also best to have them removed and thoroughly cleaned properly maybe the place that cleans them can replace the injector that's having the issue these injectors for your 1998 v70R are very costly i checked a few different sites and the white stock injectors are 176.00 each that's ridiculous i replaced all 5 injectors in my wagon with brand new units from Bosch for 34.00 each.and i have the 1998 v70xc

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Re: 1998 V70R Random Misfire

Post by fitz548 » Sat May 16, 2020 2:29 pm


Mriv1998
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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Sat May 16, 2020 2:42 pm

Well now after driving it fine all day the code came up as cylinder 5 so I’m wondering if My issues are more serious than the injectors. I’m ordering the Crank sensor and gonna give that a try but right now my engine was shaking so rough when I got home after literally giving me zero issues all day. I have no idea what’s going on and neither do the mechanics

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Re: 1998 V70R Random Misfire

Post by abscate » Sat May 16, 2020 3:24 pm

If it’s really running rough, the cylinder ID isn’t reliable. It uses the crank sendor to determine which cylinder is firing well but poor running will fool it
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Re: 1998 V70R Random Misfire

Post by fitz548 » Sat May 16, 2020 3:29 pm

the mechanics have no idea whats going on with it? take it to another shop then------ sounds like to me you first and foremost need to replace the crank sensor. i think everything points to that. one thing i would like to mention is you picked up a used car correct? you mentioned that it was maintained by a non Volvo expert? let me say this you need to do a complete stage zero to this car to eliminate any other issues that are present and may come up. these cars can be fun but they can also drain your wallet fast unless you have a good job that affords you projects like this. it is my opinion that a lot of people that pick up these cars don't have any idea how much the cost of the maintenance can be on these cars. it can get crazy expensive and you end up in a money pit

when i picked up my 1998 v70xc it was shit almost completely dead so much abuse over the years in the end it cost me big big money to fix everything on it i took my time but i did the stage zero list first and foremost to eliminate most issues that come up from poor maintenance etc. the main reason i wanted this year of car is because its the last year before they put all of the electronic shit all over it ---like electronic throttle body/coil on plug set up etc.. in the end was it worth it to fix anything and everything yea maybe i did alot of work but as i mentioned this car was abused and not properly maintained.
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