Outer Limits 4x4 Board

Hello again everyone.. I have been having a number of engine problems lately with my 1991 Sierra.
It seems that every time my foot gets to a certain height above the floor when I am accelerating the engine coughs really badly. And more often than not stalls!
I have replaced the fuel pump and all of the leads which has greatly improved the performance of the engine but it is still doing this.. What else can be the problem!?!

Why did you start a new thread? you already have one open on your problems.

You need to check everything.

Have you checked your timing with a timing light?
Are you sure the engine is correctly timed? (its not 180 out)
What condition are the spark plugs in?
Have you replaced the fuel filter?do

A few things to try
Take the intake tube off start the engine and with one hand slowly cover the intake till the engine starts to die then hold it there for a while. then with your other hand bring the revs up a little and hold it for about 10 or 15 seconds do this a few times.
This will clear out your fuel bowl and help clean out your fuel jets.

Take the fuel line off at the carby let the fuel out then fill it with carby cleaner and put it back on then start it up and run it at high revs for a few seconds.

With the engine running spray some carby cleaner all around the carby and see if the revs change if it does find the air leak.

dave for a mechanic you really dont know shit.
the car is running so its obiously not 180 out timing wise.
with all your bullshit posts its no wonder they kicked you out of auszookers

start with the basics
fresh fuel
fuel filter
check or replace leads and plugs
check cap is not cracked
no vacuum leaks
ensure fuel pump is suppling enough fuel (mine played up badly due to this)
run and drop hand across carb top as dave said to clear jets.
It could also be a coil breaking down but there's plent to check first

ajsr wrote:dave for a mechanic you really dont know shit.
the car is running so its obiously not 180 out timing wise.
with all your bullshit posts its no wonder they kicked you out of auszookers

start with the basics
fresh fuel
fuel filter
check or replace leads and plugs
check cap is not cracked
no vacuum leaks
ensure fuel pump is suppling enough fuel (mine played up badly due to this)
run and drop hand across carb top as dave said to clear jets.
It could also be a coil breaking down but there's plent to check first

Is the fuel filter really close to the back of the car?? Like underneath along the fuel lines? I remember seeing it at one point a few months ago?
I have replaced all leads and have a new fuel pump.. I will start with the Spark Plugs... Which cap are u referring to when u say "Check Cap is not cracked?" And how would I check for vacuum leaks???

I have a feeling this is one of those usual sierra carb problems..

OK... Well I just went out and played with it for a bit... I cleaned the Fuel jets etc by covering the air intake like you said.. And than i sprayed CArby Cleaner around it and found there was a little leak but that is just because i didn't have the top air intake bolt done up.... Which hose do I spray Carby Cleaner into?
Say I am standing at the front of the Suzy and I am pretty sure it is the lead that enters the carby on my side of it???
And I suppose that doing it this way is the correct way of cleaning the carby? We always just take off the air intake and spray it into the top of the carby. But I am geussing this is he wrong way to do it?
After doing these few things the engine is still playing up. I always change the revs untill a certain point and hold it there and the revs will just gradually die off untill it stalls..

check your vacuum lines and also the mechanical and vacuum ignition advance
grab yourself a workshop manual and work through the problem solving section.
auszookers has a factory service manual on the site somewhere.

ajsr wrote:dave for a mechanic you really dont know shit.
the car is running so its obiously not 180 out timing wise.
with all your bullshit posts its no wonder they kicked you out of auszookers

start with the basics
fresh fuel
fuel filter
check or replace leads and plugs
check cap is not cracked
no vacuum leaks
ensure fuel pump is suppling enough fuel (mine played up badly due to this)
run and drop hand across carb top as dave said to clear jets.
It could also be a coil breaking down but there's plent to check first

Hmm so you call me a idiot then you repeat just about everything I say???
Your a joke mate.

If you take a second and go read this guys other thread he has already done most of what you said.

If the cam is 180 out and the wires are swoped around accordingly it will run.
He has a new fuel pump, new leads he is running good fuel.
I told him to replace the fuel filter.
And I told him how to check for vacuum leaks.
And I told him to check the condition of the spark plugs.

I wish I was as GODLY as you who come from that great land of auszookers.

If you going to have a stab at me go ahead but it would be best if you don't make your self out to be more of an idiot in the proses

sickzuk1 wrote:
Is the fuel filter really close to the back of the car?? Like underneath along the fuel lines? I remember seeing it at one point a few months ago?
I have replaced all leads and have a new fuel pump.. I will start with the Spark Plugs... Which cap are u referring to when u say "Check Cap is not cracked?" And how would I check for vacuum leaks???

Yes the filter is back nere the fuel tank just inside the chassis rail.
He is saying to take a good look at your distributor cap and rotor button. Check to see its condition clean off the contacts.
Did you check the vack line that goes all the way accross the back of the motor to the canister on the other side?

something small but worth doing take the PCV valve off and give it a clean out.
Do you have a second coil laying around you test fit? Maybe a car you can barrow it from? Most of the coils off your old carby cars will work.
Have you replaced your fuel filter yet?
Are any of the springs on the side of the carby broken? My choke spring broke causing crazy problems.

sickzuk1 wrote: Which hose do I spray Carby Cleaner into?
Say I am standing at the front of the Suzy and I am pretty sure it is the lead that enters the carby on my side of it???
And I suppose that doing it this way is the correct way of cleaning the carby? We always just take off the air intake and spray it into the top of the carby. But I am geussing this is he wrong way to do it? :

Its not the wrong way. Doing it that way your only cleaning half of the carby. Your only cleaning where the air goes through now you need to clean where the fuel goes through. BUT REPLACE YOUR FILTER FIRST. With that done take the fuel fead line off the carby (the line that goes from the old fuel pump to the carby. Take your can of carby cleaner and put as much as you can into that hose and put it back on. Start the sierra up and let it run for a few second. What this does is puts the cleaner through the fuel side of the carby (bowl, ventura, jets) Its like doing a injection service on a new car.
Spraying the cleaner down the guts of it is ok just watch out for the miss fire/back fire .

KEEP THE PERSONAL COMMENTS OUT OF IT.


Layto....

V.W.Dave wrote:

sickzuk1 wrote:
Is the fuel filter really close to the back of the car?? Like underneath along the fuel lines? I remember seeing it at one point a few months ago?
I have replaced all leads and have a new fuel pump.. I will start with the Spark Plugs... Which cap are u referring to when u say "Check Cap is not cracked?" And how would I check for vacuum leaks???

Yes the filter is back nere the fuel tank just inside the chassis rail.
He is saying to take a good look at your distributor cap and rotor button. Check to see its condition clean off the contacts.
Did you check the vack line that goes all the way accross the back of the motor to the canister on the other side?

something small but worth doing take the PCV valve off and give it a clean out.
Do you have a second coil laying around you test fit? Maybe a car you can barrow it from? Most of the coils off your old carby cars will work.
Have you replaced your fuel filter yet?
Are any of the springs on the side of the carby broken? My choke spring broke causing crazy problems.

sickzuk1 wrote: Which hose do I spray Carby Cleaner into?
Say I am standing at the front of the Suzy and I am pretty sure it is the lead that enters the carby on my side of it???
And I suppose that doing it this way is the correct way of cleaning the carby? We always just take off the air intake and spray it into the top of the carby. But I am geussing this is he wrong way to do it? :

Its not the wrong way. Doing it that way your only cleaning half of the carby. Your only cleaning where the air goes through now you need to clean where the fuel goes through. BUT REPLACE YOUR FILTER FIRST. With that done take the fuel fead line off the carby (the line that goes from the old fuel pump to the carby. Take your can of carby cleaner and put as much as you can into that hose and put it back on. Start the sierra up and let it run for a few second. What this does is puts the cleaner through the fuel side of the carby (bowl, ventura, jets) Its like doing a injection service on a new car.
Spraying the cleaner down the guts of it is ok just watch out for the miss fire/back fire .

Ok well i will give this all a go hey? Thanks. And ummm Dave is that 2-Inch OME Lift Kit still up for grabs?

Hey mate when I drop this lift kit off to you I will spend a few mins with you and have a look at it for you if I have the time.

V.W.Dave wrote:Hey mate when I drop this lift kit off to you I will spend a few mins with you and have a look at it for you if I have the time.

Ok thanks heaps.. I should have it down pat by then tho. My dads worker was a mechanic for quite a while and he said that it is definitely the ignition coil So i will give that a shot...

Did you say that you were coming Monday next week? As in 7 days time?

Yes were are you in cairns? pm me

Engine problem is fixed!!!!
I replaced the Ignition Coil and now it runs beautifully! The only problem is that it is easier to stall. But hey. That is why god created the person that created the accelerator!

Did you check the ignition timing? with a light?

V.W.Dave wrote:Did you check the ignition timing? with a light?

Nope.. IDK how to?

Ok everyone... The fun continues..
The engine stalls... If I dont have my foot on the pedal giving it a little bit of grunt the engine will turn off.
So it is apparant that when I am breaking at an intersection or whenever I change gears too slow the engine dies..
I need to know what on earth is going on? Because it is quite dangerous to drive on the road to work every day...
Does anyone know what the issue may be???

Your carby is probably shagged. One of the many issues with the standard aisin carbs. Get it rebuilt or put on a corolla carb or something similar.

get the carby rebuilt then take it to a professional to get it tuned.

It all comes down to affordability but personally I enjiy the limited time I have to get away in my 4WD so I'd rather spend the time driving than breaking down.

The cheap stuff for someone with limited mechanical knowledge:
-Remove fuel tank and flush (it's probably never been done in its life and your vehicle is 15+ years old)
-Remove fuel filter, charcoal cannister if you have one and disconnect fuel lines from the motor and give them a blow from front to back with compressed air.
-With the engine running give the carby a good dose of carby cleaner 4-5 times blocking off the supply of air to create more vaccum (see you have done this once)
-with the engine running and the air intake restricted (enough to keep the engine running) spray carby clean around the outside of the carby, if the revs change you have a vaccum leak.

Next step, I personally would go this way to make sure my car is both reliable and efficient:
-new plugs, leads, dizzy cap, points, have the carby reco'd (make sure you use a reputable shop to do this), do your fuel line and tank flush, replace your air/oil/fuel filters then get your car run on a Dyno.