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2001 XC70 hard starting only on warm days

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
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2001 - 2007 XC-70
2001 - 2009 S60
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darrylrobert
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2001 XC70 hard starting only on warm days

Post by darrylrobert » Fri Mar 06, 2020 7:45 am

Ive been chasing a hard starting issue on my 2001 v70xc since i purchased it 4 years ago. happens during summer on 30c (think thats about 75-80F) days car starts normal after overnight but after getting to running temp then stope for 10mins it will sometimes crank but not start, always starts after 3 attemps. No codes. When it does start i can drive to a safe place like home and start it numerous times normally but leave it for 20mins and it can often hard start again but not always.

Have got the 'start prevented try again' message once so i switched out the receiver module (pic) hopefully this is the problem. I swapped out a spare ignition key module thinking it wouldnt work but its not as sensitive as my original module and whats strange i can unplug it and the car still starts.

Have also swapped the fuel injectors thinking it could be a leaking injector as after 1hour after shut down on a hot day there is no pressure on the fuel rail. Left overnight when its cool and it still has pressure after 12hours..
IMG_20200305_171209.jpg
I thought these were programmed to the car
I have a spare fuel tank pump which i am planning to instal when i empty the tank some more, thinking it may be the pressure valve releasing pressure when its hot. I have also heard a screeching noise once coming from the pump area when it was hard starting.again no codes no check engine


now that summer is over probably have to wait 12 months to find out if my fixes worked

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abscate
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Re: hard starting only on warm days

Post by abscate » Fri Mar 06, 2020 7:58 am

Temperature dependent stuff is almost always electronic in nature, but the antenna ring is a really robust device and seldom fails.

The antenna is not coded to the car, its just a pickup.

Is your battery relatively new and gives solid, well over 12 volts reading at rest?
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oragex
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Re: hard starting only on warm days

Post by oragex » Fri Mar 06, 2020 10:49 am

How are the small wires at the coolant temp sensor connector ? Also the dash outside temp is it correct ?

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darrylrobert
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Re: hard starting only on warm days

Post by darrylrobert » Fri Mar 06, 2020 8:15 pm

thanks, i will check those wires. both cluster temps appear correct, the outside temp on the cluster is spot on however only one the drivers side sensor works the passenger side isnt communicating with the computer. This hard start issue has been since i purchased the car, i think the previous owner swapped out the mirrors as they are missing the folding motor and i have a folding mirror button. Anyway my scan tool tells me there is a communication missing signal issue with one of the mirrors, i will check this again.

Do both mirror temp sensors need to be working?

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darrylrobert
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Re: hard starting only on warm days

Post by darrylrobert » Fri Mar 06, 2020 8:33 pm

i came across this utube video, and its a volvo. they diagnose it to be the coolant sensor but i believe this sensor also controls the cluster temp gauge, so wouldnt i see the gauge saying "cold" rather tahn normal 12 oclock position?


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abscate
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Re: 2001 XC70 hard starting only on warm days

Post by abscate » Sat Mar 07, 2020 6:17 am

No you won’t. The gauge is really only a cold, normal, overheat indicator, there is very little range on the scale

The fuel injected when cold is about 3x normal, so if the ECT isnt in spec the engine won’t run well.
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