Starting problems

[yamaha04]

I have a 93 tracker that i have to use starting fluid to start. After it starts it runs like a champ. I had replaced the fuel pressure regulator already. The pump is fine, just tested that. I am at a loss on this one, other than a general idea that the vacuum in the throttle body is not working or the controller is messed up. Any ideas and thoughts would help THXs

[viperh]

Originally Posted by yamaha04

I have a 93 tracker that i have to use starting fluid to start. After it starts it runs like a champ. I had replaced the fuel pressure regulator already. The pump is fine, just tested that. I am at a loss on this one, other than a general idea that the vacuum in the throttle body is not working or the controller is messed up. Any ideas and thoughts would help THXs

Do a compression test. 10 bucks for a compression tester at walmart but you might be able to rent one from autozone for free then post the results.

[cheyenne'88]

Think you're right about the vacuum. Things to check are those which are supposed to occur at startup. Since you have gas and spark, all that's left is the emissions equipment.
My first guess is evap canister.
Here's a link to functions and testing. Scroll down through and see that components/tests are vehicle specific.
http://www.autozone.com/servlet/UiBr...3d801f0962.jsp
Here's my reasoning. (from the site)
"The evaporative emission control system is designed to prevent to release of gasoline fumes, containing environmentally damaging unburned hydrocarbons, into the air. The system does this by storing the fuel vapors until the engine is started, at which time the vapors are vented into the incoming air charge to be burned by the engine. The system uses a container, known as the vapor storage container, filled with activated charcoal to trap the fuel vapors until needed."
I think you have a line blocked that won't allow the first charge of gas into the intake.

[viperh]

Originally Posted by cheyenne'88

Think you're right about the vacuum. Things to check are those which are supposed to occur at startup. Since you have gas and spark, all that's left is the emissions equipment.
My first guess is evap canister.
Here's a link to functions and testing. Scroll down through and see that components/tests are vehicle specific.
http://www.autozone.com/servlet/UiBr...3d801f0962.jsp
Here's my reasoning. (from the site)
"The evaporative emission control system is designed to prevent to release of gasoline fumes, containing environmentally damaging unburned hydrocarbons, into the air. The system does this by storing the fuel vapors until the engine is started, at which time the vapors are vented into the incoming air charge to be burned by the engine. The system uses a container, known as the vapor storage container, filled with activated charcoal to trap the fuel vapors until needed."
I think you have a line blocked that won't allow the first charge of gas into the intake.

Uh yeah considering the fuel injector still pulses fuel during start up so by your reasoning the fuel injector is spraying fuel into the intake but the fumes from the canister aren't and the engine isn't starting because of that.


the basic motor needs fuel, spark, and compression to work. Your fuel is the combination of gas and air. The spark starts the miniexplosion in the cylinder. The compression causes the explosion otherwise all the cylinder is good for is roasting marshmallows. You said you have fuel and spark which leads to the next step of the troubleshooting process, compression. What can fubar your compression?
Blown head gasket, incorrect timing, bad rings, bad valves.

How do you test for compression? A compression tester... Try that as the first step in this troubleshooting procedure then we can go from there.

If the compression test passes then we can look over the vacuum system but I doubt thats your problem for not starting.

[cheyenne'88]

Yeah, I guess you're right.

But how about if the gas wasn't coming from the tank because of a low pressure area there, because the can wasn't allowing the vapors and fuel to return to the tank? Wouldn't the tank be in a vacuum state, and keep the injectors from getting fuel? Would that also fill up the overflow, and would that be a problem?

I guess I was reaching pretty far there. Compression is the more than likely culprit.
I was looking for why it wasn't getting gas at startup.

[viperh]

Originally Posted by cheyenne'88

Yeah, I guess you're right.

But how about if the gas wasn't coming from the tank because of a low pressure area there, because the can wasn't allowing the vapors and fuel to return to the tank? Wouldn't the tank be in a vacuum state, and keep the injectors from getting fuel? Would that also fill up the overflow, and would that be a problem?

I guess I was reaching pretty far there. Compression is the more than likely culprit.
I was looking for why it wasn't getting gas at startup.

I guess we need some clearification from the original poster..

Do you have spark pull the plugs out hold it next to the manifold and see if it sparks while someone cranks.

Do you have fuel take the intake off and jam a piece of paper under the injector while someone cranks.

If both of those are yes do a compression test then post the results.

[cheyenne'88]

Got to thinking, and I had the same problem. Wouldn't start because of a broken O2 sensor wire.
I fixed the wire, and it started.
Wish I'd have remembered it sooner. As ridiculous as it sounds, it happens. I only remembered it because someone else had the same problem/solution.

[dgee]

it could be the computer.

[freekshow74]

easiest way to check for vacuum leaks is carb and choke cleaner. spray the motot at idle, when you hit the leak it will bog down or die. if you need the parts to fix it let me know i just got in a few new parts.

[smurfmobile]

check electronic idle control, facing engine is on the left side of the intake, has 2 screws, 2 vac lines, 1 plug with 2 wires, unplug it and put a jumper wire tween the plug wires,. start if that's the problem, I took mine off and could replace it for 250 bucks, or could spray it down with berryman's, and put it back on and it's ran fine every since. didn't seem to hurt smacking it a few times either.