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96, 850 N/A hesitation issue

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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Danonly55
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Year and Model: 1996 850 sedan
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96, 850 N/A hesitation issue

Post by Danonly55 »

I searched the forum and found nothing for my particular model, The car started hesitating at idol and during acceleration. The red arrow showed up on dash but then went out. Car still didn't feel right. Yesterday I reset the #2 O2 sensor code and drove it about 3 miles with no issues. Any Ideas where I should start ?
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
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greg850r
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Re: 96, 850 N/A hesitation issue

Post by greg850r »

Start with looking for vacuum leaks.
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
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erikv11
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Re: 96, 850 N/A hesitation issue

Post by erikv11 »

Good call from greg850r. Replace those crumbling, 20 year old rubber vacuum hoses ...

A guide: viewtopic.php?t=65002
'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, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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abscate
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Re: 96, 850 N/A hesitation issue

Post by abscate »

Every 30,000 miles you should evaluate ignition parts on a P80

Spark plugs (replace if they are Cu type, regap expensive type where possible)
wires
Coil
Distributor cap
Rotor

Those last two should be shiny copper clean and bright on all metal parts
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Danonly55
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Re: 96, 850 N/A hesitation issue

Post by Danonly55 »

abscate wrote: Mon Sep 02, 2019 6:33 am Every 30,000 miles you should evaluate ignition parts on a P80

Spark plugs (replace if they are Cu type, regap expensive type where possible)
wires
Coil
Distributor cap
Rotor

Those last two should be shiny copper clean and bright on all metal parts
I have replaced all ignition parts less than 2k miles ago, I ordered a PCV system kit today, It's due anyway.
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
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Danonly55
Posts: 69
Joined: Thu May 03, 2018 1:23 pm
Year and Model: 1996 850 sedan
Location: AZ
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Re: 96, 850 N/A hesitation issue

Post by Danonly55 »

erikv11 wrote: Sun Sep 01, 2019 10:04 pm Good call from greg850r. Replace those crumbling, 20 year old rubber vacuum hoses ...

A guide: https://www.matthewsvolvosite.com/forum ... hp?t=65002
Sweet link with pics , Thank you !!
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
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Danonly55
Posts: 69
Joined: Thu May 03, 2018 1:23 pm
Year and Model: 1996 850 sedan
Location: AZ
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Re: 96, 850 N/A hesitation issue

Post by Danonly55 »

Ok I just hooked up the OBD reader and started the car, The code it's throwing is 0102 not sensing air flow, looks like I may need a MAF sensor also?? Car did not want to stay running, Had to feather gas peddle to keep running.
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
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erikv11
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Re: 96, 850 N/A hesitation issue

Post by erikv11 »

p0102 may be a bad MAF or very commonly, a vacuum leak. Usually the rubber elbow behind the corner of the intake manifold, on the passenger side. Called "line 3" in that link up above.

To test the MAF, unplug it with the car off, then start it up. Without a MAF the ECU will go into default air:fuel mixture, running a little rich, but should run just fine if the MAF is the problem. This will set a MAF code which you'll need to reset after the test.
'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, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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Danonly55
Posts: 69
Joined: Thu May 03, 2018 1:23 pm
Year and Model: 1996 850 sedan
Location: AZ
Has thanked: 19 times
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Re: 96, 850 N/A hesitation issue

Post by Danonly55 »

erikv11 wrote: Mon Sep 02, 2019 10:38 pm p0102 may be a bad MAF or very commonly, a vacuum leak. Usually the rubber elbow behind the corner of the intake manifold, on the passenger side. Called "line 3" in that link up above.

To test the MAF, unplug it with the car off, then start it up. Without a MAF the ECU will go into default air:fuel mixture, running a little rich, but should run just fine if the MAF is the problem. This will set a MAF code which you'll need to reset after the test.
Ok great I will give that test a try and also check the #3 vac line. I'll keep ya posted. Thank you
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
User avatar
Danonly55
Posts: 69
Joined: Thu May 03, 2018 1:23 pm
Year and Model: 1996 850 sedan
Location: AZ
Has thanked: 19 times
Been thanked: 3 times

Re: 96, 850 N/A hesitation issue

Post by Danonly55 »

Danonly55 wrote: Tue Sep 03, 2019 8:30 am
erikv11 wrote: Mon Sep 02, 2019 10:38 pm p0102 may be a bad MAF or very commonly, a vacuum leak. Usually the rubber elbow behind the corner of the intake manifold, on the passenger side. Called "line 3" in that link up above.

To test the MAF, unplug it with the car off, then start it up. Without a MAF the ECU will go into default air:fuel mixture, running a little rich, but should run just fine if the MAF is the problem. This will set a MAF code which you'll need to reset after the test.
Ok great I will give that test a try and also check the #3 vac line. I'll keep ya posted. Thank you
I performed the test, and it acted as you said. The #3 vac line looked and felt in good condition.
1996 Volvo 850 sedan base
1980 Mercedes benz 300sd " Shotzie"
1997 Ford f350 7.3

Life is tough, but it's tougher when your stupid'
" John Wayne
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