Petrol & Air condition problem (Problems Fixed)

[wylie5]

Need Help
allways had diesel trucks never petrol so all new to me I have Purchaced a nissan patrol wagon RX EFI (94) dual fuel have two problems with it, that are giving me greaf Problem No 1. runs like crap on petrol hard to start,bit rough at idle. I have checked the timing it's set about 11 degrees you have to nail it to get it to go, have put clamp on treturn fuel line it helps but not that much but gose all right on gas have done search but not realatvie to my problem, put new leads,plugs some say the oxegen/air senser is faulty I just don't know, if any one can help that would be great.
Problem No 2. Air con will not go it has been working and running cold puled up at the sevo to get gas no more cold air fan runs but air compressor light dose not come on , have checked fuse and repleced it Have put wire from battery + to wire on compressor and the compressor kicks in and blows cold, have put a small open ended pease of wire on the sencer wires but nothing happens do need help
Cheer Wheelybin

Problem fixed See Last page. 2 - 02 - 08

[BDH GU]

Problem 1

Start by changine the fuel filter if it is marginaly better when the return clamp is on sound like a blocked filter. from there maybe the guel pump is getting lazy have the fuel pressure checked.

Problem 2 check power at the switch an make sure it is putting out 12V to the AC clutch possible brocken wire/faulty switch

Brad

[PGS 4WD]

Fuel injectors likely blocked, common on duel fuel, due to lake of use on petrol. Crimping return raises pressure and richens the mixture, forces more past the injectors. Also put a fuel pressure gauge on and drive hard around the block and make sure the pump output is OK, often the pupms fail on duel fuel cars due to lack of clean fuel, they are continually circulating crap if not using petrol.

I think the A/c operation is through the ECU, be careful running the compressor from the battery as you are bypassing the high pressure switch and you could cause the system to blow if left on too long.
Joel

[wylie5]

Problem 1

Start by changine the fuel filter if it is marginaly better when the return clamp is on sound like a blocked filter. from there maybe the guel pump is getting lazy have the fuel pressure checked.

Problem 2 check power at the switch an make sure it is putting out 12V to the AC clutch possible brocken wire/faulty switch

Brad

Hi Brad thank you for the reply,
fuel filter was very dirty, Have replaced it ,it has improved it a bit but still relucktent to go (still have to ring the date out of it)
Clamps are nice and tight
Looks like l have to get the fuel pump checked for pressure

Will pull the the switch out to day and check

Cheers Andrew.

[wylie5]

Fuel injectors likely blocked, common on duel fuel, due to lake of use on petrol. Crimping return raises pressure and richens the mixture, forces more past the injectors. Also put a fuel pressure gauge on and drive hard around the block and make sure the pump output is OK, often the pupms fail on duel fuel cars due to lack of clean fuel, they are continually circulating crap if not using petrol.

I think the A/c operation is through the ECU, be careful running the compressor from the battery as you are bypassing the high pressure switch and you could cause the system to blow if left on too long.
Joel

Hi Joel thank you for the reply, Have put two .500mls contaners of neon injector cleaner in 75 ltrs of petrol and nailed it for a distance of 65kms, with no improvment, well alittle bit any way, but as soon as l take the clamp off the return line, it struggles again. will get pump pressure cheched.

What l forgot to mention before, Was that their is a small container of flash lube it pumps this in when she is running on gas. as to wether this stuff is any good, l don't know, it was on the truck when l bought it

l only run the a/c for a few seconds just to hear it kick in then removed the wire will check the switch to day

Cheers Andrew.

[Jimbo]

Mine was doing similar when the fuel pump was gone. I hooked up a fuel prssure gauge and it was 31 PSi. I didnt think it was low enough (should be 40) but when i put the new pump in it fixed everything although it no has a small flat spot at partial throttle put otherwise good.

Jimmy


PS: I just bought an after market Walbro pump off ebay $90. I ahd never changed an intank pump and it was very easy (once tank was out)

[wylie5]

Mine was doing similar when the fuel pump was gone. I hooked up a fuel prssure gauge and it was 31 PSi. I didnt think it was low enough (should be 40) but when i put the new pump in it fixed everything although it no has a small flat spot at partial throttle put otherwise good.

Jimmy


PS: I just bought an after market Walbro pump off ebay $90. I ahd never changed an intank pump and it was very easy (once tank was out)

Hi Jimmy
Will be getting pressure check this week, you say around 40 PSI as l do beleave my fuel tank has the pump in it, l hope that this is solve all my problems, well we will see.

You say that you have a flat spot at idle, Have you had it on the dino yet
Do you know how meny KWs you are getting, l am getting 4.6 kms to 1 ltr of gas ? 121 kms on 26 ltrs gas, will check ebay for a pump.

Cheers Jimmy.

[Jimbo]

I had it on a dyno when i fist got it but that was when pump was stuffed. Nt sure what it made but it gets around 23L/100km on gas. I think around 20 on petrol

[MUNGA GQ]

mine was running the same,
had the fuel pressure checked it was low. fitted a new fuel pump,. and the air flow meter was rooted as well.
I think the air flow meter when it backed fire due to the fuel pump problem.

[wylie5]

mine was running the same,
had the fuel pressure checked it was low. fitted a new fuel pump,. and the air flow meter was rooted as well.
I think the air flow meter when it backed fire due to the fuel pump problem.

Hi Munga GQ,
After you replaced the fuel pump and the air flow meter, how did it go, did you get more power and trouqe, also did you put it on the dyno, do you know what the k/watts are, and what sort of economy you are getting at the moment, Do you have a flat spot at idlie.
Cheers Andrew

[wylie5]

Problem 1

Start by changine the fuel filter if it is marginaly better when the return clamp is on sound like a blocked filter. from there maybe the guel pump is getting lazy have the fuel pressure checked.

Problem 2 check power at the switch an make sure it is putting out 12V to the AC clutch possible brocken wire/faulty switch

Brad

Hi Brad,
Can you tell me, if l have small quiet back fires at the end of the tail pipe, if that has some thing to do with the tuning or timing

Cheers Andrew.

[BDH GU]

Back firing is genraly caused by unburn fuel igniting in the exhaust.
Esentialy a few things cause it. Being too rich ie not enough air to fuel for combustion, incorrect timing bag plugs and or leads etc.

Brad

[wylie5]

Back firing is genraly caused by unburn fuel igniting in the exhaust.
Esentialy a few things cause it. Being too rich ie not enough air to fuel for combustion, incorrect timing bag plugs and or leads etc.

Brad

Thanks Brad,
Have not had a chance to check the fuel pressure yet, As l have been working up in the Alps, Some time back had a block who put gas analizer up the pipe and we went for a drive, It was to lean and after he had finashed, He said that it was using the same amout of fuel (Gas) as a VL comadore, It did improve it heaps, Will check some things out, Thanks.

Cheers Andrew.

[wylie5]

Fuel injectors likely blocked, common on duel fuel, due to lake of use on petrol. Crimping return raises pressure and richens the mixture, forces more past the injectors. Also put a fuel pressure gauge on and drive hard around the block and make sure the pump output is OK, often the pupms fail on duel fuel cars due to lack of clean fuel, they are continually circulating crap if not using petrol.

I think the A/c operation is through the ECU, be careful running the compressor from the battery as you are bypassing the high pressure switch and you could cause the system to blow if left on too long.
Joel

HI Joel,
Have been working in the Vic ALPs, So l have not had a chance to do much yet, As we have so much work on, Any way, l have a small amount of blue smoke that come out of the back of the exhaust tailpipe, If she is left to idle for a few mins, could this be leading to a rootd air flow meter, And may be the reason for some small back firing at the tailpipe, when you take the foot of the peddle or are going down hill with no throtle, Also some times you can smell gas in inside the wagon.

Cheers Andrew.

Probem fixed

1/ Air conditioning - In the swithch their is the small globe, that comes on when you turn the air on, what had happened is the globe had fallen out. and this had broken the curcit, as soon as l had put the globe back in and reasemble it, it went (not looking back now).

2/ Pressure was down on the pump, Have replaced it with a new one, cleaned all the fuel lines, fittered new filter again, put it on the scope and tuned it on petrol and gas, do not seam to feel the difrance between petrol & gas at the moment. gose well now.

Thank you to all that contributed
Cheers Wheelybin.