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850 loves cold start, hates warm weather start

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

Warren Watson
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Joined: Fri Sep 17, 2010 7:48 pm
Year and Model: 850 1994
Location: Golden, Colorado
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Warren Watson

850 loves cold start, hates warm weather start

Post by Warren Watson » Sun Jan 24, 2016 1:33 pm

My 1994 Volvo 850 will start up like a pro in sub 20 degree F. weather. Above 50 it is a hard start. In either case I get it started and if I kill it, it will start up no problem within 5 mins. of killing it. 20 minutes later, i try to start it and takes for ever. Note: i have a new fuel pump relay, cleaned MAF, new cam sensor, temp. sensor, rotor and distr. cap,,new plugs, fuel filter, vacuum elbows, and, if i check fuel at schraeder valve, i have fuel squirt out. What is left?

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erikv11
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Year and Model: 850, S/V70, 06 S60R
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erikv11

Re: 850 loves cold start, hates warm weather start

Post by erikv11 » Sun Jan 24, 2016 5:06 pm

The symptoms almost match a heat soak situation, which would be strongly suggestive of an electronics issue. Temp goes up, resistance increases, system behaves differently.

What brand is the MAF? At any rate I would unplug the MAF, then see how that affects the starting behavior. Of course this test will set a CEL for the MAF, so you will need an OBD reader to reset that.

Cleaning the MAF does no harm when the right product is used so it was a good move doing that, but FYI it is rarely useful unless the filament is super dirty (like visibly oily, etc).

Also I would check the condition of the wiring inside the ECT connector, the metal can get corroded and the wires frayed etc.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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