1999 xc70 wagon Won't start when it's hot

Post by **katlou** » 03 Jul 2015, 10:30

It always starts in the morning when it's cool, but in the afternoon if the outside temperature is in the 80s and it's sitting in the heat (like when I'm at work,) it won't start. It just turns over and over but doesn't catch. If I wait till morning when it's cool again, it starts right up. Took it in for 135,000 mile servicing about a month ago, and the guy didn't find anything wrong then.

Post by **vtl** » 03 Jul 2015, 12:15

Often it's MAF, or MAP, or CPS.

Post by **abscate** » 04 Jul 2015, 03:05

Moved to P80 forum for correct year...

The engine coolant temperature sensor tells the car when to inject more fuel for a cold start. If it gets old, hot starts will be tough. Mechanic or you can test resistance values and compare to numbers in this thread.

https://www.matthewsvolvosite.com/forums ... hp?t=52203