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1995 850 Turbo acting n/a and running rich

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

Kuhnboy
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Kuhnboy

1995 850 Turbo acting n/a and running rich

Post by Kuhnboy » Sun Sep 08, 2019 11:33 am

Ok. So I've been trying to figure this out for awhile. My car has been acting up all summer (I haven't been driving it because of it). It's been running very rich, and does not put the boost gauge past halfway. I've had a scanner on it to confirm the fuel issue other than the mpg gauge. I've checked intercooler hoses, wastegate rod, fuel pressure, and everything I can with obd2. I'm at a loss at this point, and any help would be greatly appreciated. Thank you in advance for any replies.



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erikv11
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Re: 1995 850 Turbo acting n/a and running rich

Post by erikv11 » Sun Sep 08, 2019 12:47 pm

You checked the induction hoses (good call) but did you also go over the vacuum lines carefully? Would have to be a big leak, maybe the fat brake booster hose?

Check carefully for vacuum leaks around the intake manifold while you are at it.

You can't check fuel pressure with obd2, if that's what you meant. Must use a pressure gauge. FPR vacuum line doesn't reek badly of fuel?

Does the exhaust flow freely?


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

Kuhnboy
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Kuhnboy

Re: 1995 850 Turbo acting n/a and running rich

Post by Kuhnboy » Sun Sep 08, 2019 1:06 pm

I have actually replaced some vacuum lines from the tcv. I checked fuel pressure with a gauge off the rail, then with a scanner I mapped the short term fuel trim and the computer is dumping fuel into the motor. The exhaust does flow freely, the cat was replaced recently and I cut the pipe slightly after that and put a band clamp on it. It's currently disconnected so that's not an issue. And I have checked the FPR line, and no it does not smell like fuel.



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abscate
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abscate

Re: 1995 850 Turbo acting n/a and running rich

Post by abscate » Sun Sep 08, 2019 1:51 pm

Back to basics

Compression rotor plugs wires coil

If it’s misfiring the ECU will shut off boost, so get your engine running right first


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erikv11
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Re: 1995 850 Turbo acting n/a and running rich

Post by erikv11 » Sun Sep 08, 2019 1:57 pm

abscate wrote:
Sun Sep 08, 2019 1:51 pm
... get your engine running right first
If that's not a given here, I'm in the wrong thread ...

Are there misfire codes???


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

Kuhnboy
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Kuhnboy

Re: 1995 850 Turbo acting n/a and running rich

Post by Kuhnboy » Sun Sep 08, 2019 2:04 pm

I have tested resistance on plug wires, and all were in range. I did plugs 5k ish miles ago. It runs smooth, until I ask it to accelerate. There are no codes with it, and it doesn't sound like a misfire. Just sounds like it's hitting a rev limiter at 2k. I haven't had a compression gauge on it, but all cylinders sound even when cranking. I will take a look at the rotor. Any way I can test the coil other than getting a known good one?



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abscate
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Re: 1995 850 Turbo acting n/a and running rich

Post by abscate » Sun Sep 08, 2019 2:16 pm

Pull one plug and attach it to the wire, ground the thread, and look for a fat blue spark at the plug to confirm coil is good. Have a helper crank while you watch the plug under hood

Ohm measurements on plug wires aren’t too meaningful, most here swear by Bougicord and report problems with anything else,


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Re: 1995 850 Turbo acting n/a and running rich

Post by greg850r » Sun Sep 08, 2019 2:21 pm

abscate wrote:
Sun Sep 08, 2019 1:51 pm
Back to basics

Compression rotor plugs wires coil

If it’s misfiring the ECU will shut off boost, so get your engine running right first
This is how I would do it as well and I wouldn't trust a resistance test to rule out wires. If the plugs are not Volvo don't trust them either.
Take them out and read them. Do they all look the same? It would rule out a stuck open injector, but this does not sound like that is the problem. Bosch cap and rotor just because. Then I would look elsewhere.
If the computer is telling it to dump too much fuel possibilities (in order of probablility) are: Temp sensor in thermostat housing, front o2 sensor, MAF.


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
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02 Sportster Custom
Parts cars not included

Kuhnboy
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Kuhnboy

Re: 1995 850 Turbo acting n/a and running rich

Post by Kuhnboy » Sun Sep 08, 2019 2:51 pm

I do have bougicord plug wires. I have cleaned the maf, it read about 4.0 g/s and I also tried unplugging it. When I unplugged it the car just stalled. I do have a Bosch cap and rotor that are not corroded. I did replace both upstream and downstream o2 sensors with Bosch units. I'm still looking for my spark plug sockets so I can pull them out. I don't know if this is relevant to the temp sensor mentioned, but the fan kicks in when it should and my temp gauge reads right in the middle once the car warms up. The car did this when I first got it as well, but that was because the fuel line in the tank was loose and almost came off the pump. I already verified that isn't the problem again. It was fixed for a year, and then I was on an on ramp and I suddenly had no power. I apologize for adding things that I forgot, I've been working on replacing the motor in my pickup and that's taken priority in my mind so I'm remembering as I go with this.



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Re: 1995 850 Turbo acting n/a and running rich

Post by BlackBart » Sun Sep 08, 2019 3:17 pm

It sounds a bit like a vacuum leak, or an intercooler component not being tight.


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1994 850T wagon
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Is it time for a 1964 122 wagon?

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