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shutter during acceleration

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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tom4342
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shutter during acceleration

Post by tom4342 » Mon Jan 25, 2016 2:46 pm

Would running regular gas in a 98 v70 awd turbo cause a slight shuttering during acceleration? It never did before.
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erikv11
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Re: shutter during acceleration

Post by erikv11 » Mon Jan 25, 2016 4:14 pm

Not likely, no. Ill effects of regular gas (from running lean) are cumulative over time.

However if you got "bad gas" which does happen this time of year, yes.
'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: shutter during acceleration

Post by tom4342 » Mon Jan 25, 2016 5:02 pm

Well been running regular for 3 or 4 years so maybe its added up
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Re: shutter during acceleration

Post by erikv11 » Mon Jan 25, 2016 6:16 pm

Ah ok I thought you meant just one tank of regular.

The turbo engine is made to run like 91 octane. The main risk of running regular (lower octane, like 87 or even 89) is burning an exhaust valve, which would be worse symptoms than stuttering during acceleration. You could try switching to higher octane, the car's ECU will figure out that you did and adjust, and it is a good idea, but I doubt it will fix the stuttering.

Are there any codes, is the Check Engine light illuminated?
'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: shutter during acceleration

Post by benpineapple » Tue Jan 26, 2016 6:55 am

If you have an OBD reader, I'd reset the ECU once you fill with premium. Shudder could be a lot of things, especially if it's a rogue symptom with now CEL.

Does the V70 feel like it has much power, or is it pretty tame typically?
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2001 V70 X/C AWD

1998 V70 AWD [RIP at 249,255M]
1990 240 [SOLD at 220xxxM]

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Re: shutter during acceleration

Post by tom4342 » Sat Jan 30, 2016 8:05 am

A family member has the car so am going by what she is telling apparently it still has plenty of power might tell her to run a can of sea foam through it
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Re: shutter during acceleration

Post by tom4342 » Sat Jan 30, 2016 8:06 am

Only code showing is large evaporative leak which i have yet to nail down however that never seemed to affect performance.
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Re: shutter during acceleration

Post by erikv11 » Sat Jan 30, 2016 8:54 pm

If it is still stuttering after getting new, known-to-be-good gas, I would consider, in order:

- ignition parts. What is the age on cap-rotor-wires-plugs?
- throttle position sensor. The only way I know to test this is to swap in a good one, like from a junkyard. Not a great troubleshooting strategy if you don;t have a spare part.
- MAF sensor, but these often (but not always) throw a code. What brand is it, what is the age on it?
- vacuum leak. Again, it should throw a code, but they don't always.
'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: shutter during acceleration

Post by abscate » Sun Jan 31, 2016 5:03 am

Is it shuddering ( low frequency vibration) or stuttering (m-M-missing) ??
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Re: shutter during acceleration

Post by Cees Klumper » Sun Jan 31, 2016 10:23 am

Could it be a worn driveshaft bearing?

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