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1996 850 rough running, bad FI 2, bad ECU....That rare occasion when it IS the computer

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

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greg850r
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Location: Mo
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greg850r

Re: 1996 850 rough running, bad FI 2, bad ECU....That rare occasion when it IS the computer

Post by greg850r » Mon Dec 19, 2016 5:22 pm

erikv11 wrote:Especially if you are doing upkeep on several P80 cars, having a parts car saves you tons of time and money as compared to going the junkyard. Once you actually try it, you will understand. Easier, faster, cheaper. The drawback for me is deciding how long I want to have a shell of a car hanging around out in the back driveway. If I had some kind of large garage or outbuilding, I would probably have a parts car at all times.
I have 3 that will eventually go to scrap out there at the moment and yes, my wife says it looks like a junkyard. When the R wagon she was driving split an oil cooler and filled the cooling system with oil, overheating it, she did not complain about me having a Platinum sedan I bought 6 months ago with a bad trans ready to go the next day. I used to do this with GTOs (had 13 at once) but they are getting too hard to find too valuable to use for DDs.
05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

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erikv11
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Year and Model: 850, S/V70, 06 S60R
Location: Iowa
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erikv11

Re: 1996 850 rough running, bad FI 2, bad ECU....That rare occasion when it IS the computer

Post by erikv11 » Mon Dec 19, 2016 11:29 pm

greg850r wrote: ... I am living the good life ...
13 GTOs at once ... I am not worthy.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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greg850r
Posts: 270
Joined: Thu May 03, 2012 5:06 pm
Year and Model: a long list
Location: Mo
Has thanked: 4 times
Been thanked: 9 times
United States of America
greg850r

Re: 1996 850 rough running, bad FI 2, bad ECU....That rare occasion when it IS the computer

Post by greg850r » Wed Dec 21, 2016 12:14 pm

Let it sit overnight with the battery disconnected and then put a jumper between the pos and neg cables to be sure. Plugged into OBD and powered it up with key in position II. I thought my fuel trim would now be zero as there has been no run time. Oh, and the DTC is 1310

Follow up: Found a missing cap on the vacuum tree that was sucking air and fixed it. Took the car for a drive with scanner on live data and witnessed huge negative short term fuel trim numbers in the -20s.
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DTC.jpg
DTC.jpg (48.6 KiB) Viewed 223 times
05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

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