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  #1  
Old 05-04-2015, 05:06 PM
rickychavezzz rickychavezzz is offline
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Default 1998 B4000 cranks, but won't start

Hey guys, I know a little about cars. Motors, transmissions, electrical, etc. But, today, I can't figure out this problem.

I have my mom's fiancee's 1998 Mazda B400 4x4 with the 4.0 motor, and I changed the spark plugs (gap at 0.054"), changed the oil to full synthetic, changed the fuel filter, and just changed the furl pump. I did the fuel filter and fuel pump because I didn't hear the fuel pump prime. Yes, I checked the inertia switch and it's in the down position. After doing all that, the truck still won't start. It cranks, but won't start. The truck was running FINE after the oil change and spark plug change. Then, 3 days later, after sitting, the truck didn't start and that is when i didn't hear the fuel pump prime. Hence why I changed the pump and filter.

Any ideas???
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  #2  
Old 05-04-2015, 05:07 PM
djfllmn djfllmn is offline
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Default Re: 1998 B4000 cranks, but won't start

will it fire on a little ether?
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  #3  
Old 05-04-2015, 05:59 PM
Lariat Lariat is offline
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Default Re: 1998 B4000 cranks, but won't start

Check your fuel pump relay. They tend to corrode and not allow contention in the terminals.
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  #4  
Old 05-04-2015, 06:09 PM
msparks msparks is offline
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Default Re: 1998 B4000 cranks, but won't start

My VW Passat done that. It was the crank sensor.
If the crank sensor completely fails, the computer can no longer calculate engine speed. When this occurs, the ignition system and the fuel system shut down causing the engine to crank and not start or to stall if the engine is running.
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Old 05-05-2015, 03:10 AM
Jswifto Jswifto is offline
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Default

Have you even checked fuel pressure?
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  #6  
Old 05-05-2015, 06:31 AM
TxGasRacer TxGasRacer is offline
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Default Re: 1998 B4000 cranks, but won't start

http://troubleshootmyvehicle.com/for...rt-condition-1 http://troubleshootmyvehicle.com/for...he-fuel-pump-1
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