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94' Volvo 855T Cold Start Issues Topic is solved

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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henrysin44
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Year and Model: 1994 Volvo 855 Turbo
Location: Guilford, CT USA
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94' Volvo 855T Cold Start Issues

Post by henrysin44 »

Hey all, ive finally got my 850 fixed enough to be a daily driver again but I'm still having a few symptoms i'm abit stumped on.
On morning start ups it will idle at 1K-1,200 and if I don't wait for it to settle to its usual idle it drives like its drowning in fuel, if I wait it drives great. No codes set on OBD I or OBD II. To me it seems like a coolant sensor but I'll hear the radiator fan kick in during traffic.
Another odd idle related symptom I'm having is every once in awhile when stopped at a light the idle will bounce rapidly between 700-800 RPM for 2 seconds making a weird rapid thumping exhaust tone.
Daily driver Black 1994 Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, de-catted, custom two-tone interior, V70R seats & rims
Teal 1994 Volvo 855 2.5L N/A Manual Transmission (the back up daily and parts car) - Runs and Drives but the engine knocks
Silver 1997 Honda CRV 2.0 AWD - its in a very sorry condition, but drives
Silver 2003 Subaru Forester 2.5L N/A AWD - Leaks everything
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crlande
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Year and Model: 240DL;850;S70
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Post by crlande »

Cleaning the IAC valve and throttle body stopped the two second low idle at lights on my '94.
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WhatAmIDoing
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Post by WhatAmIDoing »

Coolant temp sensor is a good suspect, so is a bad MAF (but I believe you just replaced that). IAC cleaning can also solve a lot of idle problems. Thumping exhaust points to a missfire.
'98 S70 T5M - 323,000mi - awaiting heart transplant :shock:
'98 V70 T5M - 324,000mi - my new project
'99 S70 "AWD" - 220,000+mi - gone :cry:
Knows enough to be dangerous :wink:
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