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#673378 - 04/10/10 09:33 PM
Re: Xterra will not crank
[Re: msbelk]
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Member
Registered: 28/09/10
Posts: 12
Loc: Eastern Pa
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Engines need two things to run, fire and fuel. You know you have a good battery, so now see if you have "spark". Check to see if the power is reaching the spark plugs. If you do, then you know it has nothing to do with the battery, wires or plugs.
Next check fuel delivery. Is fuel getting to the engine? On an old fashioned carb it is an easy check, but with these new cars you need to go primitive. You have to crank it a bit while giving it throttle and then use your nose. If you smell gas, then you are getting fuel.
If you have both fuel and fire, then there are two other problems that could be working against you. The first is a timing issue. If you timing belt/chain is gone, the engine will not start. This is usually pretty obvious as when you crank the car, it is rough and not like a normal start.
If while you are cranking the X and the engine is turning in a normal fashion. And you have confirmed that you have both fuel and flame, then the problem is most likely digital in nature. Some chip or sensor acting up. If this is the case it will most likely not be a home fix, if nothing else, because tracking the chip or sensor down requires the right computer program.
These are just a few ideas in order of how I would investigate the problem.
stasiman
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#673386 - 05/10/10 06:25 AM
Re: Xterra will not crank
[Re: stasiman]
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Member
Registered: 08/03/01
Posts: 7756
Loc: Lawrenceville, NJ, USA
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Engines need two things to run, fire and fuel. You know you have a good battery, so now see if you have "spark". Check to see if the power is reaching the spark plugs. If you do, then you know it has nothing to do with the battery, wires or plugs.
Next check fuel delivery. Is fuel getting to the engine? On an old fashioned carb it is an easy check, but with these new cars you need to go primitive. You have to crank it a bit while giving it throttle and then use your nose. If you smell gas, then you are getting fuel.
If you have both fuel and fire, then there are two other problems that could be working against you. The first is a timing issue. If you timing belt/chain is gone, the engine will not start. This is usually pretty obvious as when you crank the car, it is rough and not like a normal start.
If while you are cranking the X and the engine is turning in a normal fashion. And you have confirmed that you have both fuel and flame, then the problem is most likely digital in nature. Some chip or sensor acting up. If this is the case it will most likely not be a home fix, if nothing else, because tracking the chip or sensor down requires the right computer program.
These are just a few ideas in order of how I would investigate the problem.
stasiman I'll add a third thing it needs, oxygen to support combustion. If the intake is blocked, or the engine can't get enough air in (Or out if the exhaust is blocking it, etc...)...that can ALSO keep it from starting. Just to keep the record straight. 
_________________________
- TJ 2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes.... Friends don't let friends drive stock. http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif
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#673390 - 05/10/10 05:53 PM
Re: Xterra will not crank
[Re: TJ]
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Member
Registered: 28/09/10
Posts: 12
Loc: Eastern Pa
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Engines need two things to run, fire and fuel. You know you have a good battery, so now see if you have "spark". Check to see if the power is reaching the spark plugs. If you do, then you know it has nothing to do with the battery, wires or plugs.
Next check fuel delivery. Is fuel getting to the engine? On an old fashioned carb it is an easy check, but with these new cars you need to go primitive. You have to crank it a bit while giving it throttle and then use your nose. If you smell gas, then you are getting fuel.
If you have both fuel and fire, then there are two other problems that could be working against you. The first is a timing issue. If you timing belt/chain is gone, the engine will not start. This is usually pretty obvious as when you crank the car, it is rough and not like a normal start.
If while you are cranking the X and the engine is turning in a normal fashion. And you have confirmed that you have both fuel and flame, then the problem is most likely digital in nature. Some chip or sensor acting up. If this is the case it will most likely not be a home fix, if nothing else, because tracking the chip or sensor down requires the right computer program.
These are just a few ideas in order of how I would investigate the problem.
stasiman I'll add a third thing it needs, oxygen to support combustion. If the intake is blocked, or the engine can't get enough air in (Or out if the exhaust is blocking it, etc...)...that can ALSO keep it from starting. Just to keep the record straight. Good catch, my bad! I tend to forget about the oxygen factor because so many of today's vehicles have some form of electronic fuel injection that takes care of the fuel air mix. And when that is the case you are back to a chip/sensor issue. Things are not quite as simple as my old Ford P/U, where you could check if you are getting fuel and air simply by taking off the air cleaner and looking into the carb. I am pretty new to the XTerra, and have not delved under the hood yet, so I have no idea weather my engine has an old fashioned carb or some form of electronic delivery. Regardless, the same principles apply. Fire, Fuel, and O2. If you have all three, move on to mechanics (timing) and electronics (chips and sensors). stasiman
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