Throttle Body Set Screw- '98 V70

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bmdubya1198
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Throttle Body Set Screw- '98 V70

Post by bmdubya1198 »

I was messing around with my throttle body today, trying to diagnose an increasingly frequent pulsing idle, and I noticed that it takes a little bit of movement of the throttle pulley to move the butterfly off of the set screw on the back (or side).
When I turn the pulley by hand, the rod that connects to the arm from the pulley has a little play and the butterfly does not move off the set screw until I move it a little further. I apologize, because I know I'm probably not explaining this great.
Anyway, should the butterfly open instantly when I turn the throttle pulley? Should I tighten up the screw a little bit to get rid of the play, or is it supposed to be like that?

I also tightened up my throttle cable a little bit after watching Robert's video showing the slack in the cable (while searching for information on this screw!). I always figured if when I pulled the cable and it turned the pulley, that was good enough. A couple turns tightened up the slack and definitely improved throttle response!
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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
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E Showell
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Post by E Showell »

Don't know about that set screw, but if it cures your pulsing idle, let me know. I've had a pulsing idle for years.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
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Post by bmdubya1198 »

I'm leaning towards the MAF as far as the pulsing idle. I'll go ahead and adjust it tomorrow and see what happens. Anyone else?
Anyone know if the EVAP hoses can cause an idle issue? I have P0442 and occasionally P0455 pop up.
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
88 744 Turbo M46

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E Showell
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Joined: Thu Oct 16, 2008 4:00 pm
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Post by E Showell »

No evaporation issues for me.

I suspect air idle control valve. Mine's original at 340k miles. I cleaned it once, but it didn't seem to matter.

MAF not the cause of my wavering idle. I suspect it won't be the cause of yours.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

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Post by bmdubya1198 »

Hmm, that's weird. I cleaned the heck out of my IACV back in February, and I've had it out once or twice replacing hoses and it still looks good. Later that day though, my car was idling in park at around 1,400 RPM, so I had to pull it and clean it again the next day, which cured the high idle.
Of course, there's always a chance the valve failed mechanically.
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
88 744 Turbo M46

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E Showell
Posts: 3214
Joined: Thu Oct 16, 2008 4:00 pm
Year and Model: V70R '06 AWD Auto
Location: Long Valley, N.J.
Has thanked: 35 times
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Post by E Showell »

Or there's an internal short in the wiring.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

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Post by abscate »

You should be able to monitor the MAF output with a decent scanner and confirm the numbers are stable
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bmdubya1198
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Post by bmdubya1198 »

So... adjusting that screw didn't decrease play in the pulley, just increased idle speed... which I kind of expected.
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
88 744 Turbo M46

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