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Matt, Engineer
Category: Volvo
Satisfied Customers: 16866
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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Volvo S70: 99 s70volvo hard starts during cold weather on

Resolved Question:

'99 s70volvo hard starts during cold weather only
Submitted: 11 months ago.
Category: Volvo
Expert:  Matt replied 11 months ago.
Hello

can you tell me what the engine size , fuel type and when it was last serviced please?

also how many miles are on it and what you have tried to date
Customer: replied 11 months ago.
2.4 5cyl....regular gas...150000 miles
Expert:  Matt replied 11 months ago.
Hello

this could be incorrect fuelling due to a faulty water temp sensor. If this is the problem then the ECU may not controlling the the fuelling as the engine warms - so unplug the sensor and clean the contacts on both sides with some switch / electrical cleaner (not WD40) and inspect the wiring for any signs of damage to the insulation especially where it runs over other components and through the bulkhead- if this doesn't help consider replacing the sensor as they're not expensive

Matt, Engineer
Category: Volvo
Satisfied Customers: 16866
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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