looooooong cranking time on starts

4-Cyl. Technical/Performance Discussions
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bawolvesfan
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looooooong cranking time on starts

Post by bawolvesfan »

Hey, ive got a 95 dohc 1.6 and it takes forever to start. replaced the injectors, spark plugs, fuel filter, and fuel pump and it didnt change anything.
any idea???
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mitmaks
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Post by mitmaks »

what do you mean, it cranks for while before it'll start? How old is your battery?
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bawolvesfan
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Post by bawolvesfan »

the battery seems fine, its not cranking slowly, its just cranking for a long time before the engine fires up
bawolvesfan
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Post by bawolvesfan »

roughly 5 seconds
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mitmaks
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Post by mitmaks »

sometimes low/old battery will make it crank for while. Of course low amp battery would crank for longer than higher amp battery, especially if its cold
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Bumpysbro
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Post by Bumpysbro »

i also have a 95 dohc, mine does the same thing. sometimes takes about 5 to 6 seconds to start and other times bam starts instantly. i also replaced the injectors, pump, filter. have you tried testing your fuel pressure regulator? either too low or too high of pressure makes longer crank times. test the line pressure.
1995 mazda Mx-3 RS 1.6liter DOHC B6-DE
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Yoda
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Post by Yoda »

Long cranking time usually indicates a lean condition not a battery condition. Could be low fuel pressure, vacuum leak, carbon build up in the TB, poor compression, a defective ISC, a defective F/P or even a defective ECU. Does it start better if you press on the throttle about 1/4 way?
bawolvesfan
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Post by bawolvesfan »

giving it a little gas does help, whats the best way to test and find out whats still wrong?
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Yoda
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Post by Yoda »

That would indicate that it is more likely to be a lean out condition. You will need to have someone pressure test the fuel system and check the manifold vacuum to narrow it down to not enough fuel or to much un-metered air.

Since it is a DOHC there is a possibility that the EGR valve is defective bleeding back into the intake as well. To bad your car wasn't one year newer and had OBDII then all you would have to do is plug in a scanner into the OBDII port and datalog all the stored and real time data.
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Post by Bumpysbro »

ive been noticing this too lately, very long crank times and i just got a egr code the other night. ya check your fuel pressure that should tell you something.
1995 mazda Mx-3 RS 1.6liter DOHC B6-DE
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