What's this vac line for ?

[StavTB48]

Hi gents found some time but now its getting dark out so might have to have a another look tomorrow. I did however find the post that mentions the black ribbed box http://www.nissanpatrol.com.au/forum...ght=power+loss

The ribbed box shown in the pic from the above thread is non existing on mine as that's where my LPG mixer and all the pipes are. I cant see exactly but looks like there could be a vac line going into it or am I imagining this? Sill very interested in what it is and as originally asked and didn't answer in previous posts it doesn't seem to idle up when the Aircon is on so you guys could probably be on the money there and its not related to this box or is that what the ribbed box is there for?

Will get there eventually

Cheers

[BigRAWesty]

Well mate this is very interesting. If your correct and they have removed the maf sensor in aid of the gas install then that could very well be the reason for the shoit going on with the petrol.

Could we grab a bit of a full view pick of the engine bay. Like the stock one above??

[Bloggsy]

Hi mate, At a pretty reasonable guess, I'd say the previous owner has done what is known as the PVA Mod on another forum (which I've done myself, but slightly different). The vacuum hose end with the screw in it looks like it goes to the resonator (see diagram). Note that if you are going to undo this mod you will find that the actuator rod has been removed off the PVA and the PVA has been cable tied up. This will have to be put back on but you'll need an E clip and washer. I hope this helps.

[threedogs]

Is this a common mod on petrol Patrols with Dual fuel ??

[BigRAWesty]

Hi mate, At a pretty reasonable guess, I'd say the previous owner has done what is known as the PVA Mod on another forum (which I've done myself, but slightly different). The vacuum hose end with the screw in it looks like it goes to the resonator (see diagram). Note that if you are going to undo this mod you will find that the actuator rod has been removed off the PVA and the PVA has been cable tied up. This will have to be put back on but you'll need an E clip and washer. I hope this helps.

Interesting read. It seems the 4.8's have a some what similar intake to the falcon 6's. A butterfly valve to increase the the length of the intake route and increase power.

[Bloggsy]

Is this a common mod on petrol Patrols with Dual fuel ??

Quite a few have done it, but it is not specific to dual fuels and only specific to the TB48's as far as I know. Mine is straight Petrol.

[StavTB48]

Blogsy looks like you are on the money there, the resonator is non existent and the vac line in the diagram is indeed the blocked line, unsure whats the go with the rod and PVA on mine as I haven't noticed anything out of place but guess i wasn't really looking for it. If this is a mod that people are doing or staring to do on the 4.8's and my PVA is cable tied up should I leave it all alone? I don't have the resonator or even know if one will fit back in so probably best huh. Is there any downside to this mod being done?

Bigwesty I may have been misleading on one of the posts as the maf is there not the best at explaining myself at the best of times haha. I'll try get some photo's up tomorrow, will have to look for my old digital camera. You never know you might be able to spot something else out that's in plain view as its not the tidiest engine bay i have owned and looks like some of the LPG wiring was cut and re crimped when the intake and head was off to fix a burnt valve before I purchased it as they didn't really make any effort to conceal/seal the connector's. (Is on the list to be sorted for the LPG service and tune after the new throttle body is on!) this is only a guess as I would be embarrassed if i was the gas installer and it was like it since it was fitted.

Keen to get car running right, missus wasn't impressed when I picked her up from work in it but in my defense I told her when i dropped her off that I was going to go buy one and the response was If its going to be more reliable I trust your judgement and now the issues I'm having its looking like a slippery slope haha so can't let it happen Ill never live it down!! Intended on spending some money on it as the rubber will need replacing later this year and maybe a 2" lift to get 31's under there was also considering a long range sub tank to be able to go further not relying on servo's with LPG as you get further out but need to sort it out before its even worth looking at these things and the long range sub would be pointless at the moment if its running this bad on petrol... not planning any trips soon that for sure baby steps for now

Can't complain too much tho.. someone I know has a V8 ford owned it from new just recently ticked out of the warranty so the tranny cooler in the radiator decided to fail last week and its 7K for a new box. OUCH.

Appreciate all the help guys!

[StavTB48]

On another note if you are interested in my babbling (highly doubt it, you might get a laugh at my expense tho) and know a thing or two about throttle body's there is another thread here: http://www.nissanpatrol.com.au/forum...e-of-questions

Who the hell knows.. don't know what I'm going on about these days... too much maybe.

[Bloggsy]

If the PVA mod is there you may as well just leave it there. I've had no issues with mine since doing almost 5 years ago.

[StavTB48]

Ok so had a look and the PVA is not disconnected and not cable tied open... I should now do so I guess ?