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Very minor issue but I'm stumped

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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JRL
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Re: Very minor issue but I'm stumped

Post by JRL »

No way, I paid for a new ETM so it (or another FREE ETM from Volvo if that what it comes to, but it stays).
Even at my low price (about $550 plus software) I'm not paying for another throttle from anyone.
One of my Volvo techs said to come over after work and he would hook it up and watch all the parameters again while it's acting up, and go from there.
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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rspi
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Post by rspi »

I had a 850 that did that. It was a '95 T-5R. I'd have the cruise set at 65 or something like that and while cruising I could see the tach bounce between 2200 and 2500. I would remove the cruise and try to hold it steady with my foot and it would still surge a little back and forth. Didn't do it all the time, just every once in a while.

Never did worry about it or figure it out. Sold the car. I'm not sure if my wagon is doing it. I'll have to check.
'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

JRL
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Post by JRL »

Nothing has worked and if fact it may be a bit worse!!
If I blip the gas while standing still the idle still drops down to 700 or so and bounces back and now it's starting to do this while braking when driving.
Totally at wit's end.
Spent over $400 on parts, everything related is new, yet nothing is solving this odd issue.
It runs great, it''s smooth and quick, the gas mileage got a bit better, yet this idle,......
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

jblackburn
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Post by jblackburn »

Have you changed ALL vacuum lines (even the brake booster one?)

When that stupid PCV hose to the top of the valve cover kept coming loose from the clamp on my car, it would do that whole idle dip thing. Same with a small crack in the SAS control vacuum elbow.
'98 S70 T5
2016 Chevy Cruze Premier


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JRL
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Post by JRL »

Haven't changed any of them but the car was smoked and no leaks
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

JRL
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Post by JRL »

Seafoamed the car, swapped fuel rails....AND STILL THE SAME ARRRRGH!!!
Everyone is stumped from the head tech and service manager at Keystone Volvo to Volvo corporate (the engineers at Rockleigh)!
Next thing they said was do a hard reboot (disconnect and hold the battery cables together for 30 minutes).
I don't see how that will help in this case but I'll try anything
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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E Showell
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Post by E Showell »

I've been following this. Please keep us updated as my '98 V70 NA FWD exhibits this same symptom.
'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 (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT

JRL
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Post by JRL »

Different motor, different engine managment systems
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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rspi
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Post by rspi »

I just read where someone wrote about the battery cable process to clear up an alarm issue. :?
'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

JRL
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Post by JRL »

rspi wrote:I just read where someone wrote about the battery cable process to clear up an alarm issue. :?
What in the world did that statement have anything to do with this thread?????
(Yes, you sure are confused).
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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