Mechanics

WONT START

1994 Mazda MX3

Engine Mechanical problem
1994 Mazda MX3 6 cyl Front Wheel Drive Manual 23 k miles

i have had the spark plugs, distributior cap, fuel relay, all changed but it would not turn over. I tested the spark plugs and I can hear the fuel pump turnin on, I can also smell gas. Its been fluddin wen I try to start it. The oil smells like gas from flooding. The problem started when it got really cold. It would run but when the rpms got up it sputtered. Then another cold night it just wouldnt start. Can it be out of time? Or is it some sensor I dont know about?
im confused. Please help. Oh yeah when it was running and sputterin I can hear a poppin noise from the muffler.
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Dubois64
January 6, 2009.




Hi, it sounds like you may have a fuel injector that has shorted, remove all connectors and perform a ohms check on all injectors, if one of the readings is way off leave that injector disconnected and re-connect the others. The engine should run ok, but on 5 cylinders, if so replace the shorted injector and recheck. Please let me know. Thanks for using 2carpros. Com

2CarPros Ken
Jan 7, 2009.
Well they seem ok is there something else that can be wrong? I just remembered; its started a month earlier. When I shifted into second gear it would loose power, and when I let off on the gas it would catch power again. This only happened on certain days like cold ones. Oh yeah I think the flooding happened wen I got my buddy to start it, and he pumped the heck out of it when it was cold and it started the first time, but on the second day he did it again and it didnt start.

Tiny
Dubois64
Jan 13, 2009.
Hi, it sounds like you are loosing spark, when the engine stalls can you check to see if spark is pressent? follow this video for step by step instructions

http://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm

let me know how is goes

2CarPros Ken
Jan 13, 2009.
Well it was a faulty spark plug wire, so I changed the wires, but it wont keep running. Its starts but it starts to die down right away I have to let of on the gas and I can get the rpm up to 3 and it sounds fine but wen I let off on the gas it wants to die. Popping sounds come from the muffer.

Tiny
Dubois64
Jan 16, 2009.
Sounds like we are getting closer, good, the popping fron the exhaust sounds like it could be a timing adjustment. Lets check the timing and get back to me.
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2CarPros Ken
Jan 19, 2009.
Ok well before I do that head ache of a job, can I rule out the fuel pump by doing an ohm's test? What reading am I looking for, or do I just look for the reading to go all out of wack? Because I can get at the wires through the back seat, and I can change the pump from the back seat as well.I can hear the pump turn on but I was told it can still be the pump. And about the timing. I dont have a timing light yet, but I was thinking if I can just mess with the distributor cap and lossen it and turn it and keep track of how much I turn it and where I started from. Oh yeah I will donate another 5 after this question.

Tiny
Dubois64
Jan 21, 2009.
Hi, the best way to see what is happening with the fuel system is to perform a pressure test. please check this video for reference.

http://www.2carpros.com/dia/test_fuel_pressure.htm

As far as the engine timing you can mark the distributor and move it slightly each way and check the results.

please let me know what happens.

2CarPros Ken
Jan 21, 2009.
Stupid thing still wont start. Dont know what to do next.

Tiny
Dubois64
Jan 27, 2009.
Does it have spark? And fuel pressure? Also remove the spark plugs to see what they look like, if there are havely sooted the engine will not start.

2CarPros Ken
Jan 28, 2009.
Well I took the fuel rail off and ohms tested them and they all read 13.7 ohms. Fuel pump is turning on, and as far as im concerned the fuel pressure seems good. While taking off the fuel rail I came across some exposed wires on top of the distributor cap. The color of the wires are blue pink and yellow. I didnt try it yet cause im going to get those fuel injectors tested. I followed the wires and they come from the fire wall.

Tiny
Dubois64
Jan 31, 2009.

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