[zook95]

ok so here goes im having alot of trouble with my 92 sierra 1.3L witch has a reco motor and a recond gearbox, overhauled carby all been done by a machenic, the problem is
i cannot get it to idle or even backing down gears and braking it will just stall i have been back to the mechenic 3 times now and this morning he told me he wont look at it again (so hes pretty damm confused) i have swapped carbon canisters over, replaced fuel filters ( one in the rear wheel arch and one near the carby), cleaned out the fuel tank, been tuned and timed, and i run premium unleaded fuel,
also tried swapping the leads over and cranked it (think its called the french tune if i remember right)
please help me troubleshoot my sierra
cheers in advance

[Zook_Fan]

Take the air cleaner hat off the carby and make sure both of the throats are opening on throttle. Pull the main fuel line off and stick in in a bottle and make sure that there is sufficient fuel pressure (if not replace fuel pump). It sounds like a fuel related problem, if its not the pump i would bet you've got crap in the jets and need to clean the carby out again

[beerhound]

Hey mate no expert by any means but is it running an auto choke if so it could be stuck like mine was mine actuall had a dent in it but is now fixed and Idles fine but it was doing exactly what yours is doing

[JrZook]

Slight chance it could be a fuel pump, but the symptoms are usually not at idle.

What happens when you hold the throttle just above idle? Does it run smooth or shake and carry on? DOes it do it all the time? Both hot and cold?

Most likely the idle jet is blacked again or wasn't cleaned properly. Ive also had issue with the fibre gaskets is the new kits coming apart as soon as you put them in the carb, blocking teh idle jet near straight away

Dan

[Rossco]

I like the auto choke idea, mine was playing silly buggers for a bit. this is why I'm going to EFI.. I'm over carby issues!

[zook95]

Zook_Fan wrote:

Take the air cleaner hat off the carby and make sure both of the throats are opening on throttle. Pull the main fuel line off and stick in in a bottle and make sure that there is sufficient fuel pressure (if not replace fuel pump). It sounds like a fuel related problem, if its not the pump i would bet you've got crap in the jets and need to clean the carby out again

just checket the fuel line yes there is a content squirt of fuel happening in the fuel lines cheersmate

[zook95]

JrZook wrote:

Slight chance it could be a fuel pump, but the symptoms are usually not at idle.

What happens when you hold the throttle just above idle? Does it run smooth or shake and carry on? DOes it do it all the time? Both hot and cold?

Most likely the idle jet is blacked again or wasn't cleaned properly. Ive also had issue with the fibre gaskets is the new kits coming apart as soon as you put them in the carb, blocking teh idle jet near straight away

Dan

yer mate its both hot and cold mainly hot/warm and yes it mainly happens all the time unless i crank the idle screw up and there is liqud spurting out the exhaust doesthis mean its running to rich?

[zook95]

beerhound wrote:

Hey mate no expert by any means but is it running an auto choke if so it could be stuck like mine was mine actuall had a dent in it but is now fixed and Idles fine but it was doing exactly what yours is doing

so to find out if it is the choke should i disconnect the plug and run it to see if it doesnt stall and carry on?

[JrZook]

zook95 wrote:

JrZook wrote:

Slight chance it could be a fuel pump, but the symptoms are usually not at idle.

What happens when you hold the throttle just above idle? Does it run smooth or shake and carry on? DOes it do it all the time? Both hot and cold?

Most likely the idle jet is blacked again or wasn't cleaned properly. Ive also had issue with the fibre gaskets is the new kits coming apart as soon as you put them in the carb, blocking teh idle jet near straight away

Dan

yer mate its both hot and cold mainly hot/warm and yes it mainly happens all the time unless i crank the idle screw up and there is liqud spurting out the exhaust doesthis mean its running to rich?

The liquid is just condensation/soot. To check if its not the choke, check to see if the choke flap is wide open in the carb throat once the engine is warm

[beerhound]

zook95 wrote:

beerhound wrote:

Hey mate no expert by any means but is it running an auto choke if so it could be stuck like mine was mine actuall had a dent in it but is now fixed and Idles fine but it was doing exactly what yours is doing

so to find out if it is the choke should i disconnect the plug and run it to see if it doesnt stall and carry on?

Ipulled it apart and replaced with donour parts

[jonno_racing]

i can come have a loo tomorow mate.

[zook95]

ohk thanks heaps for your help guys but i may find a problem fixed this time round but what would you all thinnk about this?
http://cgi.ebay.com.au/NEW-WEBER-32-36- ... 4cf64f4982

[barney7779]

Dont do it ^^^^^^^^^^^^^^




Have you checked to make sure the gasket between the carb and manifold is ok and also the one between the manifold and head



Sounds to me like it has a major air leak and is leaning out

[alexvitara]

barney7779 wrote:

Have you checked to make sure the gasket between the carb and manifold is ok and also the one between the manifold and head
Sounds to me like it has a major air leak and is leaning out

x2

[Teracis]

Have you got anyone close by you can borrow a good working carby off to test run?

I discovered that the entirety of my engine running problem is in the carby by swapping anto86's carby onto my zook and going for a run. When we couldn't replicate the problems we decided it was the carby on mine!

It did not help the fact that it burns oil however...

[94BAZOOKA]

I had the same kind of problem mine was blocked jets I just swapped the leads onto the wrong plug so it would backfire which cleared it out now it runs good

[shep]

wait until the end of june and i will fix it for ya
i will be in laurieton for a week board shitless so i will be looking for something to do.

[zook95]

ohk so i dont do the webber but ill have to try the swapping leads over again but it sure seems harsh on my engine to do that isnt it?

[Teracis]

zook95 wrote:

ohk so i dont do the webber but ill have to try the swapping leads over again but it sure seems harsh on my engine to do that isnt it?

Or do the rag trick. DON'T let the rag get sucked into the engine though!

[zook95]

yer might be the go has anyone ever done ny damegae doing thhe lead swapping trick

[christover1]

My carby sierra would not run right on premium,
motor cycle racing mates told me it is too dense for small jetted carbies.
Mine was doing same thing.
After a tank of 91ron all ran perfectly.

Worth a try.

[94BAZOOKA]

zook95 wrote:

yer might be the go has anyone ever done ny damegae doing thhe lead swapping trick

I was told to do it by my mechanic so I wouldn't expect it to do any damage

[Zook_Fan]

Give it a go, if it works it won't always fix the problem just blow whatever has blocked the jets back into the bowl. You will need to open it up and clean out the fuel bowl or it will happen again.

[stockman]

Teracis wrote:

zook95 wrote:

ohk so i dont do the webber but ill have to try the swapping leads over again but it sure seems harsh on my engine to do that isnt it?

Or do the rag trick. DON'T let the rag get sucked into the engine though!

Whats the rag trick?

[Teracis]

stockman wrote:

Teracis wrote:

zook95 wrote:

ohk so i dont do the webber but ill have to try the swapping leads over again but it sure seems harsh on my engine to do that isnt it?

Or do the rag trick. DON'T let the rag get sucked into the engine though!

Whats the rag trick?

It's on here but for a quick explanation.

Remove the carby hat.
Start the car (in neutral with handbrake on as usual when looking into the engine bay...)
With bunched up rag in hand, rev the engine a touch (not much just above idle will do) and cover the carby with a rag, remove it before it stalls and repeat a few times. You will probably need to rev the engine a few times as you put the rag over so it sucks all the crap through.

Only needs one person, easy to rev from the engine bay. Don't go revving the shit out of it. Also, better to do it outside because of the exhaust, I set off our smoke alarm once.