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I have a friend that brought me a 92 Chevy S10 that when you go to start it the carburator just DUMPS fuel into the engine, if you get it started it smooths out a good deal but will idle high and is running rich.
I don’t have much experience with carburetors as I was born into the fuel injection generation….this doesn’t even look like a pure carburetor either though, it looks like some electronic, mechanical bastard child, it has a bunch of electronic sensors on it that I’m not used to seeing on carburetors.
Where should I start on this problem?
The way maintenance has been done on this vehicle I expect it to have more then a few problems.
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sound like the spring is getting stuck…. I woould start out by cleaning the carberator and cleaning any moving parts… also check the idel screw and choke if you have one… havent done to much with carbators my self but it sounds like to me its getting stuck open for to long… a good clean would be my first start, then go from there
The valve is closing just fine and returns back to position, the fuel jet continues to just dump fuel in it though.
A faulty TPS maybe?
And yeah I’m working on the cleaning atm, it’s got some kind of EVAP system on it that in also replacing lines to..they used those hardlines so they’re broken and cracked.
is it really dumping fuel in the engine???? my experince is the carberator controls the fuel regulation…. so if the carberator is dumping fuel in the engine its the carberator ir ine of its ports the are dirty… a vacuum line can be it…. also check the fuel pressure too and see if that is ok…
my experince is the carberator conrols the fuel and air ratio…. but you can also check the choke too and see if thats ok that can help deturm it too… unless anyone else has ideas
there is a seat that it should have in the carberator that will block fuel when closed if the seat)aka rubber o-ring) is bad… it will dump fuel in the engineYeah I think your right, I’m going to get a rebuild kit and try it out, the more I read about it I think the float needle is fucked.
Yea the fuel jet just opens up full bore when you try to crank, no pulses or anything, usually it’s just a fine mist bit this acts like the engine is running full bore. I’ve never seen this much gas come through a fuel jet like this.
Im wundering if that car has an electronic choke system…. that might also be something to check out…. but I think its something strickly in the carberator… the float is defitetly something that could be it… but I cant think of any way of testing it with out removing the float….
just so you know the float is a “float” that will control the aka pin that pushes the seat aka (O-Ring) the will allow it to cut off the fuel to the engine
a bad float will cause it to keep running fuel to the engine[quote=”shaun” post=174038]Just a heads up, carb kits do not come with a float. Sold separately[/quote]
when you take it aprt you can test the float if its good or bad…. most iof the times when they have a leak in it… they will have fuel in them … they should be dry, but you can dunk them in water and see if they are sealed and they should float
[quote=”CrazedAssassin” post=174037]Yeah I think your right, I’m going to get a rebuild kit and try it out, the more I read about it I think the float needle is fucked.
Yea the fuel jet just opens up full bore when you try to crank, no pulses or anything, usually it’s just a fine mist bit this acts like the engine is running full bore. I’ve never seen this much gas come through a fuel jet like this.[/quote]
definetky replace the seat… that is the most comman part to be bad in what your getting problems with
before I forget to tell you some seats have polarity so you need to make sure your installing it correctly… I dont know if yours will or will not but I just want to let you know… so you will have to carfully look at the new one if it has a direction you have to install it in
Correct me if I’m wrong but I thought all the engine options for a ’92 were TBI in some form, not carburated. Sounds like an injector is stuck open, or an injector wire could be grounded out so it’s staying open soon as the key is cycled. O-ring could be an issue too.
[IMG]http://uploads.tapatalk-cdn.com/20160828/a8035b8d8c3dd90a427642b4b684d973.jpg[/IMG]
This is what the engine they I’m working on looks like.
Looks carb to me.Unless someone has re-engineered things, that truck should have throttle body injection.
If I remember correctly, Russian Ladas were the last carburetted vehicles available in North America, and I’m pretty sure even these primitive lumps were fuel injected by ’92. Ironically, GM developed the fuel injection system for Lada.
That’s TBI, being a 4-banger I believe it’s a single injector in there. TBI works just like a carb but there is no float, fuel bowl, etc. It’s sort of like a carburetor with a fuel injector. Thing to do is find the wiring connector for the injector and pull it off, then see if fuel still pours into the venturi when you try to start. If it keeps flowing then the injector is stuck open or the o-ring failed, if fuel flow stops then it’s a wiring/control issue at fault.
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