i have a 1999 Mazda b2500.. has been running perfectly fine and i went out today and the starter just kept turning over.. everything else works but the engine just wont fire..

it has 124,000 miles and the only code its throwing is the DPFE sensor high input which its had since i bought it.


this is my only vehicle so any help on this would be great.

 

fuel pump

 

I second a fuel issue.
Get a fuel pressure gauge and check it out.

 

i was thinking fuel as well.. the pump sounds normal when the key is turned but i'll try to find a gauge to check it..

 

check the drictributor cap, and rotor.. if its burnt, could also be the issue.

 

Do you have spark??? If so squirt a shot of starting fluid in the throttle body and see if it runs on that, if so a fuel issue.

 

it has coil packs so no cap and rotor

im gonna go see if i can find some starting fluid and check that

 

You could also use carb cleaner if you have that.

 

it fired with the starting fluid but died pretty much right away..

i took the bed off and the pump doesn't seem to be working so i ordered a new one

i'll pick it up from nappa tomorrow and put it in so hopefully that is the issue..

 

Did you make sure you have 12volts to the fuel pump. The fuel pump only runs for 2 seconds when you turn the key to run so do not let that fool you. You will need to jumper the fuel pump relay to check for 12 volts at the pump.

Also have you checked the fuses and relay for the fuel pump? Hate to see you dish out a coupokle hundred dollars if you don't need too.

 

ALWAYS ALWAYS ALWAYS disconnect battery for an hour or two then reset computer. Not saying it isnt the pump but id rather reset ECU than pay 150+ for pump. good luck though man

 

i checked all the fuses and they were fine but i will double check everything before i install the new pump. cause if its not the pump ill just return the new one.

 

Just had the same issue with the wife's Ranger and it was fouled plugs . ( we just bought it and were told they had been changed..) ... Truck would turn over, but not start, replaced them and it fired right up.

 

fuel pump shut off switch under the passenger kick panel. I had the same issue a few weeks ago

 

where exactly is that switch at under there?


never mind i found it. but is it suposed to be up or down?

 

its name is the Inertia switch.

You can only reset it. Smack the box part of the switch with your hand or a water bottle or something to trip it. Then hit the red button on the top of it and it'll reset its self.

 

theres a small slit that you can fit a flat head into and pop it up which i assume is the same thing as if it were tripped.

i did that and pushed it back down but my battery is dead so im waiting on my buddy who has my jumpers cables.

 

Mine was a rubber button I pressed and reset it. It shuts down the fuel line in case of an accident. Did anybody hit your truck?

 

nope no one hit it.. it ran perfect the day before and i came out the next day and went to start it and the motor just kept turning.

 

Remove your fuel pump rela, take a jumper wire and insert 1 end into terminal number 30 slot and 1 end in the number 87 slot of the distribution box. Now you should have voltage to the fuel pump. Take your test light or multimeter and see if you have current or 12 volts to fuel pump, if you do you know the pump is bad.

If no current at fuel pump go to inserta switch in cab and you should have 12 volts on both sides of switch if not the switch needs to be reset or replace if resetting does not work.

 

ended up being the bad fuel pump.. dropped in a new one and its running good again.

 

Glad you got it running.

 

I have a 99 Mazda B 2500 and I changed out the spark plugs and wires and it still won't start I know it is getting gas It just turns over with no fire can anybody help

 

Welcome to the forum

You should start your own thread/post

We will assume compression is OK which eliminates 1 of the 3 no start problems

Other 2 are fuel and spark

"I know it is getting gas"
Did you pull out a spark plug and see that it has a wet tip?
If not the you don't know it is getting gas

Fuel pump running and fuel pressure doesn't mean injectors are opening

50/50 test is easiest way to test if no start is fuel or spark related
Pull off the larger air tube(from the air filter) on the upper intake
Open throttle and spray gasoline or Quick Start(ether) into the intake
Try to start engine, you don't have to hook air tube back up

If engine start then dies fuel is the problem
If engine does not start or fire then spark is the problem
50/50

One heads up
On the 2.3l and 2.5l Lima dual spark plugs engines only the exhaust side spark plugs and coil work when cranking the engine
Intake side will start working after engine has started, above 400 RPMs

So if you have no spark then focus on that coil packs wiring.