trouble with fuel system I think. anyone have an idea?
trouble with fuel system I think. anyone have an idea?
I have a 1992 Nissan Hardbody with the 4 cyl. KA24E engine. On initial start up the truck starts without a problem. After it gets to operating temperature and I have to turn off the vehicle and then restart it soon after like for fueling up, I have to hold down the gas pedal to get it to start. If I don't it will not start and if I continue to try it floods and then I have to either wait for it to clear or push start it. I had to do a head gasket change recently and have been having this problem since. Coincidence, or did I knock something out of adjustment? All hoses and electrical plugs are connected properly. Also O2 sensor and PCV valve were replaced during repair work.
Re: trouble with fuel system I think. anyone have an idea? (traskr)
That is fuel injected right? Thinking they were in that year... Trying to make sure that I have enough information to help you. So on a cold start it fires right up, but if you stop somewhere and shut it down you have to floor it to crank it? Or am I misunderstanding and you have to shut it off and restart it when it warms up? Trying to picture what the symptom actually is but not sure in the way you have it worded.. More information would be helpful.
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Q451990
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Did you do any work to your fuel injectors while you had the truck apart?
I had a hot soak hard start problem on my old Q, and it turned out to be a problem with the remanufactured injectors that I had recently installed. They would leak down causing the engine to flood, but if left overnight the excess fuel would seep past the rings and it would start fine the next day.
It could be a leaking injector or a leaking lower o-ring if this is the issue. You should be able to check for leak-down with a fuel pressure gauge.
Heath
I had a hot soak hard start problem on my old Q, and it turned out to be a problem with the remanufactured injectors that I had recently installed. They would leak down causing the engine to flood, but if left overnight the excess fuel would seep past the rings and it would start fine the next day.
It could be a leaking injector or a leaking lower o-ring if this is the issue. You should be able to check for leak-down with a fuel pressure gauge.
Heath
Re: trouble with fuel system I think. anyone have an idea? (Nitewulf)
Yes it is fuel injected, and the first question you asked is correct. If I shut down the engine after driving and then try to restart it a few minutes later like after getting fuel, I have to hold down the gas pedal to get it to start. If I don't it acts like it almost starts but won't, and after that only push starting will work because if I try to start it even while holding the gas pedal down it just cranks until it floods. Then I have to let it sit a while (10-15 min) and then it will start by holding the gas pedal to the floor.
Re: (Q451990)
Didn't work on the fuel injectors or the throttle body. Simply unbolted the intake manifold and unplugged the wires to the injectors and pulled the manifold back to remove the head.
Re: (traskr)
Now we are getting somewhere!!!
(Possibility 1) Somehow you may have added heat to the railings of your fuel injection system. resulting in fuel not being delivered as it should. Did you purge the fuel rails afterwards? The heat from the engine could be causing your fuel to boil in the line. Preferably when cold, you need to purge or burp your fuel rail. Should be a schrader valve on the line. The safe way to do this is to use a tire inflation chuck and some clear hose so that you can watch for bubbles in the fuel. Be advised that when operating correctley there is up to 30psi in that line, not wise to use screwdriver to depress the valve core.
(Possibility 2) Often overlooked is the vapor canister, if you somehow transverssed the lines to it you can create a situation to where it vaccuum locks the fuel system. I only think of this because you mention push starting it. The lack of the initial charge to the fuel system by the key turn allows the pressure to equalize between the canister and the f/i system.
this may help you alot....http://www.aa1car.com/library/2003/us60 ... leshooting 101 for fuel injection
(Possibility 1) Somehow you may have added heat to the railings of your fuel injection system. resulting in fuel not being delivered as it should. Did you purge the fuel rails afterwards? The heat from the engine could be causing your fuel to boil in the line. Preferably when cold, you need to purge or burp your fuel rail. Should be a schrader valve on the line. The safe way to do this is to use a tire inflation chuck and some clear hose so that you can watch for bubbles in the fuel. Be advised that when operating correctley there is up to 30psi in that line, not wise to use screwdriver to depress the valve core.
(Possibility 2) Often overlooked is the vapor canister, if you somehow transverssed the lines to it you can create a situation to where it vaccuum locks the fuel system. I only think of this because you mention push starting it. The lack of the initial charge to the fuel system by the key turn allows the pressure to equalize between the canister and the f/i system.
this may help you alot....http://www.aa1car.com/library/2003/us60 ... leshooting 101 for fuel injection