Small hickup with a Nissan Patrol

Submitted: Wednesday, Feb 16, 2005 at 20:58
ThreadID: 20521 Views:1681 Replies:5 FollowUps:4
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Evening people.. Have a 93 model Nissan Patrol 4.2LPetrol, it has dual fule (gas) as well... here's the problem ... runs extremly well on the gas, very responsive with plenty of power but switch it over to petrol and the beast dies in the but, she coughs and back fires with very little power to even maintain a given speed little lone pull up a hill or tow. When your stationary she idles fairly smooth but you cant power away at all and then when you change gears and the revs drop she spluters again and you start the slow build again untill you reach around 2800 to 3oooRevs and then she fires back into action. The fuel filter is clean and the leads and plugs are all new or in good condition. Any suggestions...
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Reply By: snailbate - Wednesday, Feb 16, 2005 at 21:02

Wednesday, Feb 16, 2005 at 21:02
hi Boo
this is probley a tuning problem with the guy who does your tuning went bias to to gas you may have to have it tuned again and have 50 /50 tuning
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AnswerID: 98742

Follow Up By: Boo - Wednesday, Feb 16, 2005 at 21:06

Wednesday, Feb 16, 2005 at 21:06
Dont think its that simple... has been performing well for 12 months but the suddenly she's as sick as a dog. Had hoped it was bad fuel but have put several tanks through her since.
FollowupID: 357126

Reply By: theshadows - Wednesday, Feb 16, 2005 at 21:14

Wednesday, Feb 16, 2005 at 21:14
you going to have to check your codes on your computer.

It sounds like the MAS is dirty or has died.

Check your codes and see what they pop up with.

AnswerID: 98743

Follow Up By: Boo - Wednesday, Feb 16, 2005 at 21:19

Wednesday, Feb 16, 2005 at 21:19
Unfortunotly I'm two thirds gumby here... can you explain, not sure of what to look for. Thanks.
FollowupID: 357131

Follow Up By: Member - Jeff M (WA) - Wednesday, Feb 16, 2005 at 23:19

Wednesday, Feb 16, 2005 at 23:19
Was the 93' EFI? Could be a fuel pump...
FollowupID: 357154

Reply By: cokeaddict - Wednesday, Feb 16, 2005 at 23:32

Wednesday, Feb 16, 2005 at 23:32
So frustrating when this happens. Unfortunately cause can be so many varients. Lets look at what you said...
1 - runs great on gas
that eliminates LPG and ENGINE
ENGINE would run sick on either fuel systems if it had a problem.

2 - Idles fairly smoothly
carby is not being throttled at this point,

3 - runs sick up until u hit 2800 - 3000 rpm,
at these revs enough fuel will be sucked through carbi even if it was ur problem.

conclusion - I would definately go with a carbi problem, could be main butterfly shaft is worn, meaning it is sealed at idle thus no air getting in, once u start to throttle it, the worn shaft is causing excessive air to go through and could be part of your problem.
Also any mechanical parts in your carby can be damaged causing your problem.

I can go on and on but reality is, you need it looked at.

My suggestions are just things i think of from what was described ok. so please if you have other suggestions, post them for boo and dont wast them to throw fuel at me.

After all we are here to help each other.
Cheers Ange
AnswerID: 98767

Follow Up By: cokeaddict - Wednesday, Feb 16, 2005 at 23:41

Wednesday, Feb 16, 2005 at 23:41
Just remembered this, might help eliminate 1 possability...
throttle shaft worn.....
this can be checked by hand (cool engine)... grab throttle at base of carbi, turn it a little as it would when ur accelerating and move it side ways, if you see movement there its worn, and to finalise this test, run engine get a fine necked oil can and spray oil into the shaft at base of carby as u rev it, if you see nothing but smoke at rear of car, then you know its one of your problems.
Works like pouring oil down your venturi, we used to love doing that when we were kids.
FollowupID: 357156

Reply By: rolande- Wednesday, Feb 16, 2005 at 23:42

Wednesday, Feb 16, 2005 at 23:42
Had the same problem with duel fuel in several carby Falcon's - rebuild carby with new seals solved the problem, they tend to dry out when running on gas, no lube.
May be something else to look at, assume the '93 still carby, (or single point fuel injection).
AnswerID: 98770

Reply By: Member - Andrew(WA) - Thursday, Feb 17, 2005 at 00:10

Thursday, Feb 17, 2005 at 00:10
If yours is the Carby motor and not the EFI, I would say the diaphrams are split/leaking in the carby. If you use the gas alot and don't change back to petrol before parking overnight or long term, the diaphrams will become brittle and stuff up over time.

If you've got the EFI model, I have no idea!
AnswerID: 98779

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