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SOLVED 96 Volvo 850 rpm's "governed" at 2.5k 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

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matthew1
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Re: 96 Volvo 850 rpm's "governed" at 2.5k

Post by matthew1 » Sat Oct 07, 2017 8:47 am

Jim, put an ear to the front of the engine. Down low on the front too, around the intercooler. You might be able to hear the leak. A stethoscope will help. Or a smoke test to see where it's getting drawn in.

Erik's post is as good a theory as any on how the engine management works in this unmetered air condition.

To add to it, when you go past 1/2 throttle, the already heavily trimmed (to +++fuel) state just goes off the map entirely. It's already way out of normal, probably even at idle.

I experienced exactly this. 1/3 throttle it was fine, but when the turbo spooled, stumbles, coughing, no power. Like an old car with choke activated while warm.

I can't remember what codes I got, but I'll look back at my photos. (I used photos to take "notes", like shots of the OBD scanner.)
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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matthew1
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Re: 96 Volvo 850 rpm's "governed" at 2.5k

Post by matthew1 » Sat Oct 07, 2017 8:54 am

Oh yes, I remember now.

Rereading my Volvo 850 Blown Intercooler thread:
I'm getting around 15mpg around town and NO CODES. A BLOWN INTERCOOLER triggers no codes. I learn something every day, I guess.
No codes. :shock:
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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Re: 96 Volvo 850 rpm's "governed" at 2.5k

Post by matthew1 » Sat Oct 07, 2017 9:02 am

Another possibility: the wide, short hose on the throttle body blew partly off.
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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Re: 96 Volvo 850 rpm's "governed" at 2.5k

Post by erikv11 » Sat Oct 07, 2017 9:51 am

And that final intercooler hose, on the throttle body, also has a bad habit of splitting in a way that the split opens up when the rpms get high.
'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, 285k
'06 S60 R, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: SOLVED 96 Volvo 850 rpm's "governed" at 2.5k

Post by JimBee » Sun Oct 08, 2017 9:32 am

I edited the first post as to what I found, as follows:

thanks to the MVS wizards who pointed out where I should be looking. Neil, abscate and Erik filed some clues; Matt hit the bullseye recounting his own 850 turbo experience.

On mine, the lower hose on the intercooler had come loose and was about to fall off the nipple. A nice 5 minute fix and now back to full strength :D

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Re: SOLVED 96 Volvo 850 rpm's "governed" at 2.5k

Post by scot850 » Sun Oct 08, 2017 9:37 am

Glad you found the issue and it is nice to get a cheap and easy fix too! Well done.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
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: SOLVED 96 Volvo 850 rpm's "governed" at 2.5k

Post by abscate » Sun Oct 08, 2017 11:31 am

Nice - Volvo Horns for you.


Rinse repeat of mine last year

viewtopic.php?f=1&t=76489&hilit=1999+induction+leak

Of course, if I had been maintaining this car on a preventative maintenance (PM) basis instead of run to failure (RTF) , I would have replaced those nasty hose clamps years ago and saved myself hassle.
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