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post #1 of 7 (permalink) Old 07-29-2019, 06:57 PM Thread Starter
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New issue with my Neon 2.0L 4-speed automatic

Hello, my 2002 Neon 2.0L automatic has a new issue, when I put the shifter in P or N, the engine accelerates itself up to 2,000 rpm (no action over accel pedal). At the instant I put shifter in D, it seems to go back to normality. The car apparently drives well. The car has 87,000 miles more or less.
Anyone know which is the origin of the problem?
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post #2 of 7 (permalink) Old 07-29-2019, 09:27 PM
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idle air maybe starting to go bad and overshooting the extra needed to idle under load.
try a cleaning and see if it fixes itself.
try a battery disconnect for a bit too to reset anything.
guess i should ask too, does it atay at 2000 rpm or settle back down to idle.
and does it start up at 2000?
if so, it might be a vaccum leak.
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post #3 of 7 (permalink) Old 07-30-2019, 04:02 PM Thread Starter
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Hello, i have found the problem, it is a cracked pcv valve tube hose, the hose which joins the tube from the pcv valve with the tube to the Throttle body. I have temporary replaced this tube with a transparent tube and everything came back to normality. As this tube is transparent, i can see how pcv valve exudes a few of some fluid to the Throttle body, is this normal? should i replace this pcv valve? what is this fluid?
Anyone know the part number o where to purchase this pcv valve tube?
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post #4 of 7 (permalink) Old 07-31-2019, 11:08 PM
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You were seeing the rpm raise cause having a leak in pcv system was causing a vacuum leak. Glad you found your problem. PCV means positive crankcase ventilation, it is releasing gases back into the crankcase to get burned up and released to the exhaust and sent out the tailpipe basically. What color is the fluid you see? I assume its brown or black being motor oil, that means your rings are wearing out and the pcv system is sucking it up into the intake or throttle body. Is there any smoke out of your tailpipe? If not I wouldnt worry too much about it, it happens on high mileage engines.

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post #5 of 7 (permalink) Old 08-01-2019, 02:13 AM Thread Starter
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It is brown, it must be motor oil.
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post #6 of 7 (permalink) Old 08-01-2019, 02:29 AM
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Quote:
Originally Posted by EagleScreen View Post
It is brown, it must be motor oil.
So what other brown fluid would get sucked into the pcv system?

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post #7 of 7 (permalink) Old 08-01-2019, 02:32 AM Thread Starter
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Quote:
Originally Posted by skinnyg View Post
Quote:
Originally Posted by EagleScreen View Post
It is brown, it must be motor oil.
So what other brown fluid would get sucked into the pcv system?

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No other as far as i know.
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