Tb42 duel fuel carby issues

[bohall]

Gday i recently bought a 88 gq tb42 carby fed duel fuel lwb for a nice price. Just lately i noticed it stall on both gas and fuel . Could this be flooding or in need of a tune ? Im able to rev to about 4000rpm before it seems to sputter not sure about lpg systems and dont know where to look .

[Woof]

Hey mate, slip over here http://www.nissanpatrol.com.au/forum...-Introductions and post up an introduction, it is something we like all new members to do before asking for assistance so we can welcome you, that way everyone gets a nice warm fuzzy feeling

[Clunk]

I know nothing of dual systems apart from they seem to be a pain in the arse....... there's a few threads on here that might help you out, or gove you some ideas

[garett]

check that its not duel fuelling. test lamp at solenoid if it lights up while ur on petrol you got a electrical problem
next thing to check is air leaks on the manifold to the mixer. spark timing and advance vac/mechanical not sure which or both

[dom14]

Read previous threads by me. I had these issues for years and fair bit of it is documented and fixed with the help of forum gurus here.

[Bigcol]

well mate, what sort of Gas system is it?
is it a Vapour ring
63mm-LPG-CNG-gas-Mixer-for-autogas-conversion-tradtional-system-in-gasoline-EFI-or-carburetor-Ca.jpg
Sprint type
Sprint Gas.jpg
or the old Plate type that fits under the carby?????

your mixer
is it an Impco type,
Impco.JPG
OMVL
OMVL.JPG
or a Vialle
Vialle.JPG

none of those pic's will be what you have, just using them to illustrate the variety of types available

my first piece of advice would be

get yourself a crimping machine, a whole load of new plugs and go around the WHOLE lot, and replace all of the crimped joiners and plugs - over time they stretch and get dirt and such into the joins and dont work 100%

2nd pice of advice
get it in for a Gas service
(I used to empty my petrol tank, and take it in for a service - if they charge you for petrol or ring and tell you you have no petrol, that means they know diddly squat about the Gas and will not do it properly)
tell them thanks, but you suck, so I will take it elsewhere
if you take it to get the Gas tuned - as you will use that more often - AND they do it properly - you are on a winner

if they know what they are doing
- you will get the correct type of plugs
- you should get the correct leads you need
- they should tune it to how you want it
- economy - can get 600Kms out of an 80L tank, but you will never get over 60km/p/h driving
- power - get maybe 250 - 350 out of a 80L tank, but with speed you will also get close to 140km/p/h - if it was legal................

then let us know how you get on..............

[Bigcol]

you also dont say if you have electronic ignition
or
if you have extended the rotor button on yours

[bohall]

Im not sure about the ignition system and gas ill have a further look ill have a look 2morro i do have an impco mixer type for the gas

[Bigcol]

just asking as, with the electronic ignition, it gives a better spark when required - good gear
I ask about what type of system,
as the Gas mixer is sometimes a real pain in the ar$e if its playing up
the best I have found (as in most trouble free - ) is the Sprint type
the Vapour ring ones are a real pain to sort depending on the air filter on top
the plate ones that go under the carby - same as the Vapour ring, but underneath - are same - a pain to sort

I've had 2 Patrols with Petrol/Gas
MK with L28 and Vapour ring
GQ with TB42 and Sprint type

like I said, first port of call is to go around and replace / repair all of the little plugs on ALL the relays and such for the Gas system

1 step at a time

[Bigcol]

Im not sure about the ignition system and gas ill have a further look ill have a look 2morro i do have an impco mixer type for the gas

what I would suggest, is get the numbers off the Impco Converter and start fact finding on Google
can you get a kit to re-build it - or is it a throw away type and get a new one
is it the right one for my 4.2L 6 cylinder -( have heard of a few that were for the wrong size engine)

it may just be old and dirty and need a cleanup