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DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

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Old 09-17-2008
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RPM between shifts

2003 2.3 the rpm drops slow between shifts, sitting still in neutral and reving the motor, the rpm doesnt drop quickly. Where should I start looking.
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Old 09-17-2008
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why is it an issue?? is it sticking constantly or does it stop at a certain point for a second then reach normal again?? idle im assuming is around 750 - 900 rpm on the truck.. and you rev it and exactly what happens?? where does it stop at and how long does it sit at these spots??
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Old 09-17-2008
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Sounds like the IAC is dirty.
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Old 09-17-2008
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need a fix

Its an issue for me because I dont like the way it shifts,too much rpm between shifts.It will drop down to 800 rpm but it takes 15 seconds to do it. That aint right.When I start it in the morning, it runs at 1500 rpm and takes about a minute and a half to drop down to 800.
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Old 09-17-2008
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Quote:
Originally Posted by fddriver02 View Post
Sounds like the IAC is dirty.
a dirty what?
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Old 09-17-2008
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Originally Posted by jaycheetwood View Post
a dirty what?
Idle Air Control valve. It's what controls the engine's idle. They get dirty from the PCV system. Just take the intake tube off and spray the throttle body down with intake cleaner and spray it inside the IAC ports.
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Old 09-17-2008
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Quote:
Originally Posted by fddriver02 View Post
Idle Air Control valve. It's what controls the engine's idle. They get dirty from the PCV system. Just take the intake tube off and spray the throttle body down with intake cleaner and spray it inside the IAC ports.
hmm i may do this too even though mine isnt an issue probably cant hurt =]
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Old 09-17-2008
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Quote:
Originally Posted by fddriver02 View Post
Sounds like the IAC is dirty.
thats what i would say it was clean that and see what if it still happens
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Old 09-17-2008
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improved

I took the IAC off and cleaned it thoroughly, plus the ports in the intake. Helped quite a bit, rpm drops much faster.Now to move on to the pcv valve.
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Old 09-20-2008
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the pcv will effect the idle , and not throw a code.
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Old 09-20-2008
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heads up...PCV valve on 2.3's calls for a 60k change. How many miles on your truck??
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