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Iradic RPMs until warm

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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potroast
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Iradic RPMs until warm

Post by potroast »

In my '94 855 I am having a problem starting/idling it cold. After starting the RPMs struggle at around 100-200 and then it'll finally kick up to the propper idle at 850 RPM. If I give it any gas it will struggle. It smells like it's running rich, too. However, once warm, I can easily back it out of the driveway and it runs fine.

I checked the codes and it's 1-1-1 all-clear. Any ideas on what I can check?

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matthew1  
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Post by matthew1 »

How is your air filter, fuel line + filter. Have you run any STP Fuel Treatment lately (or similar)? Might be water in the tank. Getting fuel pressure at the rail when car's cold and off?
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1998 V70, no dash lights on

1997 850 T5 [gone] w/ MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace

2004 V70 R [gone]

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Tsquared
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Post by Tsquared »

Also check your IAC. Another area to concider is the vacume lines - possible clogs or leaks.
'11 C30 T5

'96 854 - died an early death with 184K miles. Killed by the front end of an LTD on a suicide mission (T-boned and both cars totaled).

potroast
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Post by potroast »

I'll check the IAC. The throttlebody is clean, pump/relay is new as of 5k ago. Ran some Sea Foam 3k ago.

potroast
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Post by potroast »

it was a combination of bad t-stat and Front O2 sensor. Had to take it to a mechanic to get this one fixed...

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matthew1  
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Post by matthew1 »

Wow I'm surprised it didn't set an O2 code...

Anyway, how many things have you had to do to your 850s lately :(? At least you're reducing the number of things that can go wrong moving forward :).
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1998 V70, no dash lights on

1997 850 T5 [gone] w/ MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace

2004 V70 R [gone]

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potroast
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Post by potroast »

matthew1 wrote:Wow I'm surprised it didn't set an O2 code...
yeah, that one had us both puzzled as well, but swaped em out (watched him do it) and it certainly did fix the problem.
matthew1 wrote: Anyway, how many things have you had to do to your 850s lately :(? At least you're reducing the number of things that can go wrong moving forward :).
I have 2 850s, so I actually have twice the problems as most people :p Most of my previous problems were with the 93 854 which has since been running extra-great. This was a problem with the 94 855 (I like the wagon and the sedan both for different reasons).

Although I love my volvos to death, I am sad to report that I'm looking at probably selling both and getting an 05 Tundra/Tacoma or 05 Titan/Armada as a replacement. the Endurance V8 is looking really hot lately, and Toyota released a double-cab long-bed configuration that's rather tempting. Who knows, maybe I'll keep one of the volvos... question is: which one?

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