Carby Question.

[nellyb1]

hey people.

Just trying to work out what something is on the side of my carby.

its on the engine side of the carby and has a small screw and a vacum line attached.

When attached to a vacuum near where the timing advance is, it makes a hising sounds from inside the carby. it also has a magnetic soleniod on it as well, that moves a pin away when the power is turned off.

The vacum line is not there, any ideas where it should go. the vacum seems too strong from where the timing advance is, so i'm guessing it should come from the air cleaner somewhere.

Any ideas would be good thanks.

[cooki_monsta]

could be the vaccume for egr. if ur egr has been removed its probably why there is no hose there

[nellyb1]

well it seems to be that when i hook that vacuum hose up to the where the other vacuum lines are, the car seems to run a little better. but it makes a hell loud sucking noise. as the air rushes past the button shaped thing insdie it.

Where would it normall hook to. Does it go to the under side of the air cleaner, where i'm guessing the vacuum isnt as strong.

[Jacked]

just block it off. will run better with it blocked.

[nellyb1]

oh ok.

i'll give it a go. trust me i dont think it can run any worse at the moment.

Does this control the amount of fuel going in at all.

coz at the moment, its running like a dog, back firing, pouring fuel down. it caught fire a few nights back when i had the bonnet up running it, when i turn it off coz of the amount of fuel in teh intake. Its sitting in there.

I've just rebuilt the carby itself and replaced everything.

I'll give it try tonight and if it doesnt work, i'll write somethign up again.

thanks

[RED60]

nb1 it's the propeller pitch adjuster tube........... am I missing something or have you not mentioned what motor or vehicle we are talking about.....

[cooki_monsta]

just assuming its a carbie tb42, how ever the rb 30 carbie is almost identical anyway

[nellyb1]

red your completly right. never thought of that. I was thinking that it may have been the double ended fuffel valve, with controls that hose pipe extension bar on the prop. But not the propellor pitch adjustment valve.

Sorry man, my bad.

nissan 88 gq tb42 nikki carby.

[nellyb1]

heres a tip for yall.

If your engine is running like crap and you think that the carby is playing up, I.E. using way too much fuel, missing, flooding, flatspots, poor idol, running on after being turned off. All the things that were wrong with mine.

Before you go and play with the carby, Check your fuel lines.

I've been having these problems for months. Everything pointed to, and everybody kept telling me that the carby was stuffed. You know what. it wasnt.

I was putting two new links on the rear sway bar, looked at the fuel lines jsut at a glance. What do we have here. 1 little crush. yep, tiny dint in the back of the return fuel line, but enough to squash it down. Cut it out. Guess what. Runs like a wet dream.

No doubt all the work on the carby that i've done is only making it run better. But yeh.

Nelly's tip for the day.
Check your fuel lines before you play with a carby.
Its worth it.

[brad-chevlux]

heres a tip for yall.

If your engine is running like crap and you think that the carby is playing up, I.E. using way too much fuel, missing, flooding, flatspots, poor idol, running on after being turned off. All the things that were wrong with mine.

Before you go and play with the carby, Check your fuel lines.

I've been having these problems for months. Everything pointed to, and everybody kept telling me that the carby was stuffed. You know what. it wasnt.

I was putting two new links on the rear sway bar, looked at the fuel lines jsut at a glance. What do we have here. 1 little crush. yep, tiny dint in the back of the return fuel line, but enough to squash it down. Cut it out. Guess what. Runs like a wet dream.

No doubt all the work on the carby that i've done is only making it run better. But yeh.

Nelly's tip for the day.
Check your fuel lines before you play with a carby.
Its worth it.

A crushed fuel line can't cause a carby to flood. unless it's a return line that is creating to much pressure and forcing the needle open.
In which case i'd be asking why no one did a fuel pressure test on the thing.
(and then i read your post again, and realize it WAS on the return line)

The patrol carbies are VERY VERY sensitive to float height. to much they use heaps of fuel, not enough they flat spot and spit back.

[PGS 4WD]

I believe you are refering to the BCDD, Boost Control Deceleration Device. It adds air on deceleration to reduce hydrocarbon emissions. If the diaphram inside were split you would have a vacuum leak. If poorly adjusted or faulty it can cause the revs to hang high between gear shifts.

Joel