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98 s70 hard idling/stuttering

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- 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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Keshavsmith
Posts: 54
Joined: 11 January 2023
Year and Model: 98 S70
Location: Indiana
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Re: 98 s70 hard idling/stuttering

Post by Keshavsmith »

yanga001 wrote: 11 Feb 2024, 11:11 I would say a decision needs to be made if you want to dive into more DIY and fix your car yourself or trust some run of the mill mechanics.

I know there are good mechanics out there, but normally you need to develop a pretty good relationship with them before they start really listening to the details and ideas your provide them. I would recommend buying an obd2 scanner which can check live data of the car. That way you can pull your own codes and check things such as fuel trims, engine timing, etc.

To me it almost sounds like a vac leak as the car seems to start properly but will intermittently die.

To work on these cars you need the following:
A torque wrench: see if you can get 20ftpds-100ftpds range. That will cover spark plugs, any brake calipers and wheel lugs
A socket set: you only need a few of the metric sizes, i cant rattle them off the top of my head but a 100$ set on sale should do. (8mm,9mm,10mm,12mm,13mm,14mm,16mm,18mm,19mm)
a hammer
a screw driver set

Did he check the distributor cap and rotor. Sometimes they can get a bit contaminated, and can go bad if oil leaks into them.

If it happens again, and you do have a scanner then write down what misfire it occurred on.

One cylinder misfire could point to a bad injector/potential issue on the rotor/cap. Constant multi-cylinder misfires are a bit wider and could point to Mass air flow sensor/Cam_crank position sensor/vac leaks/fuel filter etc.

Mechanics only see your car for 3-4 hours at a time, you live with it so you will have a much better feeling of what triggers the issue.

Hope this helps!


Edit:
Is 93 octane in the states the same as 91 up here? 91 is more than enough for our engines.

Here we have 87/89/91/93. May save you a bit of coin
I had the distributor cap and rotor replaced with the spark plugs and wires, so those are good.
We do have 91 here, but we it’s difficult to find. Barely any gas stations have it. 🤷🏼‍♀️

Keshavsmith
Posts: 54
Joined: 11 January 2023
Year and Model: 98 S70
Location: Indiana
Has thanked: 21 times
Been thanked: 11 times

Post by Keshavsmith »

scot850 wrote: 11 Feb 2024, 15:57 I don't believe it would be any harm. At least it may help point to the filter or fuel lines maybe the issue if it makes an improvement. Fairly cheap and something you can easily do yourself and no tools needed!

Neil.
I’m gonna try the fuel cleaner and get the fuel filter changed. Thank you!

Keshavsmith
Posts: 54
Joined: 11 January 2023
Year and Model: 98 S70
Location: Indiana
Has thanked: 21 times
Been thanked: 11 times

Post by Keshavsmith »

greg850r wrote: 11 Feb 2024, 10:53 fuel pressure would be my first check. How old is the fuel filter?
I’m not sure but I’m going to have it checked and replaced if needed. Thank you!

Keshavsmith
Posts: 54
Joined: 11 January 2023
Year and Model: 98 S70
Location: Indiana
Has thanked: 21 times
Been thanked: 11 times

Post by Keshavsmith »

abscate wrote: 11 Feb 2024, 18:12 Kesha

You will spend about one hour of labor cost to get a basic set of tools that will get you going , about $150

Don’t read too much into that fuel change. If it runs well except at idle, the Idle air valve might need cleaning
I’m going to look into having the idle air valve cleaned.. thank you

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