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Long cranking after cleaning throttle body and MAF

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Long cranking after cleaning throttle body and MAF

Post by enriquepr21 » Fri Dec 23, 2016 9:35 pm

Hi, asking for your wisdom again :)

in hopes of fixing my random stalling issue I cleaned throttle body and MAF sensor and it seems to have made an improvement as the car hasn't stalled yet. However, the car is now taking longer to crank when cold. I also cleaned the connector for the fuel pressure regulator but didn't remove the actual sensor. Where should I begin testing this issue?

The car is a 2003 S60 non turbo, I'll appreciate any help I can get

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Re: Long cranking after cleaning throttle body and MAF

Post by abscate » Sat Dec 24, 2016 3:13 am

I would test the coolant sensor resistance against spec...the chart for values is here on this forum

Did you change spark plugs after the last thread too? I don't remember. A non turbo uses the three prong type but use either Volvo or Bosch only
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enriquepr21
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Re: Long cranking after cleaning throttle body and MAF

Post by enriquepr21 » Sat Dec 24, 2016 7:12 am

abscate wrote:I would test the coolant sensor resistance against spec...the chart for values is here on this forum

Did you change spark plugs after the last thread too? I don't remember. A non turbo uses the three prong type but use either Volvo or Bosch only

Thanks I'll check the coolant sensor resistance. I haven't changed spark plugs but I'll take a look to verify brand and condition

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Re: Long cranking after cleaning throttle body and MAF

Post by oragex » Sat Dec 24, 2016 8:01 am

If I remember well, it's better to have the battery disconnected when disconnecting sensors around the engine including the tb. It seems the computer looses the calibration from these sensors when they are disconnected while still powered. I would try disconnecting the red cable at the battery - usually I do so overnight but it might take less time, when the computer resets properly you'll see the climate control on Auto setting and the cabin fan will turn at max speed with no lights on the knob.

I also read about a few people who damaged the climate unit (a small thermistor inside may blow rendering the unit inoperative) while disconnecting or reconnecting the battery. It's not a common practice, but I like to have the ignition key in position II (headlights on) every time I plug/unplug the battery.

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Re: Long cranking after cleaning throttle body and MAF

Post by JRL » Sat Dec 24, 2016 9:37 am

Also these MAFs really should not be cleaned, rather they should be replaced
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Re: Long cranking after cleaning throttle body and MAF

Post by enriquepr21 » Sat Dec 24, 2016 1:54 pm

oragex wrote:If I remember well, it's better to have the battery disconnected when disconnecting sensors around the engine including the tb. It seems the computer looses the calibration from these sensors when they are disconnected while still powered. I would try disconnecting the red cable at the battery - usually I do so overnight but it might take less time, when the computer resets properly you'll see the climate control on Auto setting and the cabin fan will turn at max speed with no lights on the knob.

I also read about a few people who damaged the climate unit (a small thermistor inside may blow rendering the unit inoperative) while disconnecting or reconnecting the battery. It's not a common practice, but I like to have the ignition key in position II (headlights on) every time I plug/unplug the battery.

Thanks so i reset the car and the climate control was on auto setting with no lights on the knob indeed. Took a little bit less to crank so I'll test a couple days and report back

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Re: Long cranking after cleaning throttle body and MAF

Post by enriquepr21 » Sun Dec 25, 2016 1:29 pm

Ok so even after resetting the car the long cranking is still there. This only happens when the engine is cold otherwise it starts right up. I forgot to mention although i don't think it's related but i removed some fuses in the driver panel which according to the manual shouldn't be there.. don't know if this could have done anything

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Re: Long cranking after cleaning throttle body and MAF

Post by abscate » Sun Dec 25, 2016 2:11 pm

I would put them back. Is your manual correct for your country
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Re: Long cranking after cleaning throttle body and MAF

Post by enriquepr21 » Sun Dec 25, 2016 2:13 pm

abscate wrote:I would put them back. Is your manual correct for your country
Not sure really.. I'll put them back and check again

Thanks

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