1998 S70 10 valve M56 tuneup, stutter at mid rev

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, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Ocelot
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1998 S70 10 valve M56 tuneup, stutter at mid rev

Post by Ocelot »

Hey guys,

It's not something I did tot my S70, but something I noticed driving today. The engine idles just fine, without anything noticeable. But when I accelerate from 1st to 2nd gear or from 2nd to 3rd, it hiccups a bit, you can feel the engine stall a bit. I know it's a lot to ask giving so little information, but I'm curious, maybe you guys can help me start to troubleshoot this hiccup.

It's a 2.5 engine with 10 valves, the B5252s from 1998. I have changed all filters, but have not looked at the spark plugs or wires.

Hope to hear from you guys!
'Hij die zonder zonde is, werpe de eerste steen. Ik buk wel'. Simon Carmiggelt

Recent car
'98 Volvo S70 2.5 10V Europa edition (Freya)
Previous owned Volvo's
'96 Volvo 440 Si 1.8
'87 Volvo 340 GL 1.7
'85 Volvo 340 DL 1.4

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bmdubya1198
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Post by bmdubya1198 »

Ocelot wrote: Sat Dec 22, 2018 6:10 am Hey guys,

It's not something I did tot my S70, but something I noticed driving today. The engine idles just fine, without anything noticeable. But when I accelerate from 1st to 2nd gear or from 2nd to 3rd, it hiccups a bit, you can feel the engine stall a bit. I know it's a lot to ask giving so little information, but I'm curious, maybe you guys can help me start to troubleshoot this hiccup.

It's a 2.5 engine with 10 valves, the B5252s from 1998. I have changed all filters, but have not looked at the spark plugs or wires.

Hope to hear from you guys!
Hmm... is it automatic or manual?
00 V70R Venetian Red/Charcoal M56 Swapped 202k
03 S60 2.4T Silver/Black 122k
07 XC90 V8 AWD Sport Titanium Grey/Black 180k
92 245 White/Beige 249k
98 V70 GLT Black/Beige 205k
00 S70 GLT Mystic Silver/Taupe 254k
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Ocelot
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Post by Ocelot »

It's a manual transmission. Funny thing is, this started today. Yesterday and the days before, there were no hiccups at all.

Sidenote: a cold engine doesn't hiccup, so my theory is it only hiccups with a warm engine.
'Hij die zonder zonde is, werpe de eerste steen. Ik buk wel'. Simon Carmiggelt

Recent car
'98 Volvo S70 2.5 10V Europa edition (Freya)
Previous owned Volvo's
'96 Volvo 440 Si 1.8
'87 Volvo 340 GL 1.7
'85 Volvo 340 DL 1.4

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Post by bmdubya1198 »

I was going to suggest the clutch switch, but that would likely affect the car at all times. Also, I don't think the clutch switch in these cars affects the engine, it's just there for cancelling cruise control.
00 V70R Venetian Red/Charcoal M56 Swapped 202k
03 S60 2.4T Silver/Black 122k
07 XC90 V8 AWD Sport Titanium Grey/Black 180k
92 245 White/Beige 249k
98 V70 GLT Black/Beige 205k
00 S70 GLT Mystic Silver/Taupe 254k
99 BMW 528i
84 BMW 318i
04 Saab 9-5 Aero
01 Mountaineer 5.0- to tow all these cars
Sold-
91 944 Turbo
93 944
98 S90
95 850 GLT
01 S60 2.4T
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WhatAmIDoing
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Post by WhatAmIDoing »

When I had hiccups as you described, new plugs, cap, rotor, wires, fuel filter, and finally a new fuel pump relay fixed it. Would start with testing the relay, especially if it's aftermarket.
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
Knows enough to be dangerous :wink:

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Post by Ocelot »

Thanks for the advice! I will look into buying new plugs, wires, a rotor and cap since I can't find in the maintenance history when they were last replaced. Should I buy OEM parts in this particular question or is aftermarket also okay? (except the fuel pump repay, I heard ya about that one)
'Hij die zonder zonde is, werpe de eerste steen. Ik buk wel'. Simon Carmiggelt

Recent car
'98 Volvo S70 2.5 10V Europa edition (Freya)
Previous owned Volvo's
'96 Volvo 440 Si 1.8
'87 Volvo 340 GL 1.7
'85 Volvo 340 DL 1.4

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Post by abscate »

OEM parts for everything if you want to run the car long term. Spark plugs are important too, especially in turbo models. We have had a couple of stutter threads resolved by switching to Volvo plugs
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Post by abscate »

Moved from chat, created new thread, retooled
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Post by Ocelot »

WhatAmIDoing wrote: Sat Dec 22, 2018 9:22 pm When I had hiccups as you described, new plugs, cap, rotor, wires, fuel filter, and finally a new fuel pump relay fixed it. Would start with testing the relay, especially if it's aftermarket.
Is there an easy way to check the fuel pump relay before buying a new one?
'Hij die zonder zonde is, werpe de eerste steen. Ik buk wel'. Simon Carmiggelt

Recent car
'98 Volvo S70 2.5 10V Europa edition (Freya)
Previous owned Volvo's
'96 Volvo 440 Si 1.8
'87 Volvo 340 GL 1.7
'85 Volvo 340 DL 1.4

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Post by Ozark Lee »

Ocelot wrote: Sun Dec 23, 2018 6:13 amIs there an easy way to check the fuel pump relay before buying a new one?
You can use a piece of wire to bypass it altogether. The wire goes between the socket positions associated with pins 15 and 87 that are marked on the relay.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
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1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
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1972 142 Grand Luxe

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