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1997 850 NA manual transmission vibration at idle (also sorting out NA EVAP hose routing)

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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matthew1
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Year and Model: 850 T5, 1997
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matthew1

Re: 1997 850 NA manual transmission vibration at idle (also sorting out NA EVAP hose routing)

Post by matthew1 » Sat Dec 28, 2019 6:18 pm

v-janitor wrote:
Sat Dec 28, 2019 5:25 pm
I took some graphs driving (at normal engine temperature, 4th gear about 55 MPH, and 2,500 RPM) of the STFT and LTFT today;
How many minutes were you driving at this steady state before you recorded?
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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v-janitor
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Year and Model: 1997 850
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Re: 1997 850 NA manual transmission vibration at idle (also sorting out NA EVAP hose routing)

Post by v-janitor » Sat Dec 28, 2019 7:16 pm

About 5 minutes.

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matthew1
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Year and Model: 850 T5, 1997
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Re: 1997 850 NA manual transmission vibration at idle (also sorting out NA EVAP hose routing)

Post by matthew1 » Sat Dec 28, 2019 8:25 pm

5 should be enough to lose any STFT data from acceleration so that it's not mixing with LTFT.

Did you reset ECU?

Weak battery? See this viewtopic.php?t=61256#p314131
Last edited by matthew1 on Sat Dec 28, 2019 8:27 pm, edited 1 time in total.
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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

Image

v-janitor
Posts: 16
Joined: Mon May 30, 2011 7:42 pm
Year and Model: 1997 850
Location: Darien, IL
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United States of America
v-janitor

Re: 1997 850 NA manual transmission vibration at idle (also sorting out NA EVAP hose routing)

Post by v-janitor » Wed Jan 01, 2020 2:44 pm

Yes, the ECU was reset. The battery voltage is 12.57 volts...

I've ordered a cheapo pressure gauge with a female schrader valve on it, and will then get clarity on the fuel pressure.

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