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No vacuum
  #1  
Old 29-03-2018, 02:27 AM
Capncoke Capncoke is offline
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Default No vacuum

Hey folks,

After reading lots of info on here Iíve had a play with my 09 pathy 2.5 to see if I can solve my issues - tons of black smoke from exhaust above 2k rpm, sod all power and terrible fuel economy.

Iíve replaced the fuel and air filters, and reset the ECU using the pedal method.

I suspect the SCV is toast as it has suffered a couple of times in the past 3 months whereby it wonít rev when just started but does when I restart the motor. Havenít changed this yet however. That being said, currently I donít have any sign of this behaviour.

The turbo actuator doesnít move at idle or at 2500 rpm & the hose to the inter cooler doesnít have any pressure - at least not to 2500 rpm as tested. When sucking on the actuator pipe, the arm that controls the turbo vanes moves about 10 to 15mm at a guess - not sure how much it should move or how hard I should suck...

The vacuum supply to the boost control gubbins near the air box is none existent - there is no vacuum supply (hence the actuator doesnít move). I have replaced the vacuum hose for this, connecting it to the metal nipple on the drivers side of the engine. There is no vacuum in the new hose either, yet my brakes are definitely getting vacuum assistance as they feel very different when I cut the engine while rolling down my driveway.

Any ideas as to where to look next?

Thanks in advance.


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  #2  
Old 29-03-2018, 03:09 AM
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ericcs ericcs is offline
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read and try this, had the same problem!


ttp://www.navara.asia/showthread.php?t=35145
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  #3  
Old 29-03-2018, 09:35 AM
Capncoke Capncoke is offline
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Quote:
Originally Posted by ericcs View Post
read and try this, had the same problem!





ttp://www.navara.asia/showthread.php?t=35145


I read your thread and see where you were losing vacuum. I have zero vacuum at that metal pipe where your broken vac hose was. It looks like there is another rubber hose that feeds the bottom of the metal tube but for the life of me I canít quite get to look at it properly. Any idea where the bottom vac hose goes to - vacuum pump? How do I get to it without removing the engine?


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Old 29-03-2018, 09:49 AM
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ill have a look at mine in the daylight.
do your brakes feel ok, they get vacuum from the same place!
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Old 29-03-2018, 10:38 AM
Capncoke Capncoke is offline
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Quote:
Originally Posted by ericcs View Post
ill have a look at mine in the daylight.
do your brakes feel ok, they get vacuum from the same place!


The brakes are definitely vacuum assisted. However, if I pump and hold the brake pedal it does slowly sink to the floor with the engine running. I havenít tried with the engine off. I thought that was more of a master cylinder issue than a vacuum boost issue though. With the engine off, the pedal is hard to use to stop the truck.


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Old 30-03-2018, 03:08 AM
jonney jonney is offline
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If the brake pedal slowly moves to the floor when pressure is applied it normally is a fault in either the master cylinder or slave cylinder. it looks like you need to replace your small vacumn hoses as no doubt there is a slit / crack somewhere thats hard to find. work out the length you need and go to Supercheap Autos for this hose.
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  #7  
Old 30-03-2018, 11:57 AM
Capncoke Capncoke is offline
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Quote:
Originally Posted by jonney View Post
If the brake pedal slowly moves to the floor when pressure is applied it normally is a fault in either the master cylinder or slave cylinder. it looks like you need to replace your small vacumn hoses as no doubt there is a slit / crack somewhere thats hard to find. work out the length you need and go to Supercheap Autos for this hose.


Thanks for the info.

I have bought hose already.

I am struggling to find where the leak is so far.


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  #8  
Old 30-03-2018, 12:03 PM
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see if you have vacuum at the steel tube on the drivers side, that will eliminate the passenger side. have you checked the boost control solenoid next to the air box, you can bypass it to test it, which will give max boost to the turbo
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  #9  
Old 30-03-2018, 12:20 PM
Capncoke Capncoke is offline
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Quote:
Originally Posted by ericcs View Post
see if you have vacuum at the steel tube on the drivers side, that will eliminate the passenger side. have you checked the boost control solenoid next to the air box, you can bypass it to test it, which will give max boost to the turbo


Thereís no vacuum at driver side steel tube (the one the vac hose to the boost control solenoid connects to).


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  #10  
Old 30-03-2018, 10:30 PM
Capncoke Capncoke is offline
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Hereís a photo...



There is no vacuum in either of the two metal pipes. I have tried swapping the hose and blanking plug over with no difference.

I can see what looks like rubber hoses attached to the bottom of these metal pipes - my hunch is that there is a leak in those. How do I get to them?


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