Outer Limits 4x4 Board

hi all, i have a 1991 1.3 sierra . I have searched and tried different things on my carbie.

Problems:
* Down hills backfires
* Low revs no power(like its cold)
* Stalls wen u stop at lights
* I cant drive in lowrange up rocks cos no low down power
* Makes a rough idol when stopped or when clutch in, then stalls

Solutions:
* New fuel filter
* Swapped the leads so it pops
* Tried hand over the intake

And still no luck. Please Help!

Father has almost exact same problem few years back. He pulled the carby off, and emptied the float bowl out, and the needle jet was full of gungy stuff. Was fine after that. He did a carby rebuild, adn replaced the fuel filter about a month later to try and prevent it happening again; so far so good.

I had similar though not so bad, was a missing vacum line on the intake manifold. Replaced it and its good too.

BTW, mine has always backfired down hills when any speed is picked up (30km/h or more roughly); I understand they just do that...

X2 Jets, mine did the same things

Pep

ok thankyou very muchly. will try that b4 1 check the fuel tank i spose lol

Is there any way to make ur car backfire? I really want myne to...

Big D wrote:Is there any way to make ur car backfire? I really want myne to...

Why
It dosent do any good and its Illegal, $240 noise polution or undue noise as they call it
yeah it might be fun if your over taking a friend and watch him jump, but seriously.

It only does damage, last thing you want is to do a nice loud key bang and you bend one of your exhaust valves then before you nkow it your piston slams into it 20 times and does more damage,
Making a car back fire is different to it poping when under compression
Buy some fire crackers its cheaper!

check your vacuum hoses....simple thing to miss and makes a hell of a difference. I suffered similar things about six months after a carby rebuild....one hose had slipped off and was hard to see when looking from the side so get on top and have a good look....you never know

Big D wrote:Is there any way to make ur car backfire? I really want myne to...

Yes there is, no I'm not saying. Think about what you just asked, and Read Danzo's post about 43 times.

Danzo wrote: Making a car back fire is different to it poping when under compression

Yeah thats what mine does, pop in a low gear down a hill. I should have been more specicif in my previous post. A proper backfire is quite different agreed.

put a different carby on it. webers work with a little playin but early 4K corolla carbys just bolt on and improve performance over the stocky.

Check your timing and vacuum lines.

Check the vacuum advance hose from the manifold to the dizzy. A leak in this hose will cause the sort of problems you are having.

I have seen sierras timing set all over the place and then idle speed adjusted to make it "work"

Steve.

Also water in the fuel will give you similar symptons did it start playing up after you last filled up?
SAM

yeah, it wasnt really idling then i filled it up then everytime i stop, it stops. im thinking it could b the power wire to the carbie also

Mine was having this problem earlier this week/month. Turned out after I did the body lift, one of the vacuum lines running from the airbox to the manifold split. Replaced it and it was still running a bit rough, but it was idling. Pulled the dizzy cap off and #3 was corroded to crap, replaced that and it was sweet. Gave it a quick hit with the timing light to make sure all was good and it's never run this well.

The easiest way to check if any vacuum lines are leaking is to start the car with the bonnet open, and spray a nice atomising aerosol in there like WD40, something that wont damage the engine if it inhales it. Once the mist is in the engine bay you should be able to see if it's sucking in or blowing out anywhere. Bear in mind the engine fan will disburse the mist quickly, so dont confuse that with a massive leak somewhere

Is the engine stalling only when you put your foot on the clutch? If so this might be a problem with your thrust bearing being siezed.

when driving clutch + stopping = stall
when idiling it just stalls straight away

Argh I've just put a new carby on (a rebuilt stocker) and it's doing this too. Will have to go over all my hoses. To make matters worse my battery has died and I can't afford one until next Friday so I'm getting very good at left foot declutch + braking and keeping my right foot on the accelerator.

This sounds like my problem too see: http://www.outerlimits4x4.com/phpBB2/vi ... p?t=120807

ok, carbie been cleaned out, re jeted, mixture of swift + sierra carbie. goes hard now...or harder lol. no polution gear or choke gear. loves hills!

i said loves hills. i was wrong. went to zig zag last w'end and if u have 1 wheel higher in the air then the height of the car it stalls..... maybe a 1991 safety feature?