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High RPM fault

 
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  #1 (permalink)  
Old 29 Jan 2011, 10:34 am
simplympd's Avatar
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Default High RPM fault

Hi! Newbie here, please be kind!

I have an '03 2.0L manual. Recently, I have been suffering an RPM runaway fault whenever I put the clutch in.

For example, in a queue at a roundabout, idle at 1000... increase to 1500 with pedal and lift clutch to move forward in queue and car behaves normally. However, as soon as I put the clutch back in the RPM either freezes or climbs anywhere up to 3000 for a good few seconds before dropping back to normal idle...

I do not appear to have any stiffness in the cable side of it so can only assume it's an electrical fault...

This happens virtually every clutch in event, no matter what gear or RPM...

Any advice much appreciated!
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Old 29 Jan 2011, 11:33 am
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Default Re: High RPM fault

My vacuum booster hose got oil soaked, and fell off the manifold.
For such a huge vacuum leak, the thing ran pretty good ...

Perhaps there's a vacuum hose off yours or something.
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Old 29 Jan 2011, 11:41 am
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Default Re: High RPM fault

Interesting response... I do have a collapsing PCV emission hose... I was under the impression that only affected idle speeds...

I have one on order...
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Old 30 Jan 2011, 11:08 am
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Default Re: High RPM fault

I have to confess, I'm still at a loss to explain how exactly a crushed vacuum hose would produce the symptoms I'm suffering.... Any experts out there?
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Old 30 Jan 2011, 11:58 am
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Default Re: High RPM fault

I'm no expert but maybe one of these will help....

Engine Vacuum Leaks

RANDOM MISFIRES

Vacuum Leaks Repair Questions Answered By Certified Technicians Free
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Old 30 Jan 2011, 12:39 pm
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Default Re: High RPM fault

Thanks for the links Crewzin! I'm off to check them now... will report back!

Last edited by simplympd; 30 Jan 2011 at 12:40 pm. Reason: to spell Crewzin's name correctly! soz!
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Old 31 Jan 2011, 12:22 am
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Default Re: High RPM fault

I was one of the idiots who purchased a Plymouth (or was it Chrysler? I can't really remember) Laser. It was a manual and had a Bosch Computer Brain. Anyway, I got rid of it in a year's time, mostly because when I would put in the clutch (not always, but sometimes), the idle would go as high as 4000 RPM's. This would also happen when I'd start the motor. The problem never occurred while in gear, however. The dealer pretended as if this was not a problem, since the engine would never do this high rpm thing whenever I took it to them for an answer.

The reason I bring this up is this: maybe you have a problem with your computer that is similar to what I encountered with another Chrysler in the early '80's.

But let's just hope it's a collapsed hose ....

Tim
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Old 31 Jan 2011, 04:07 am
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Default Re: High RPM fault

Thanks for your post! I'm pretending it can't possibly be the ECU at the moment...
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Old 31 Jan 2011, 09:51 am
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Default Re: High RPM fault

If one hose is failed, perhaps other have failed as well.

It sounds like the little idle motor is controlling the idle as it's supposed to,
when it gets out of control, the motor closes down, then as it's driven
returns to a default position, anticipating this is where it should be idling
when the throttle's closed.

Newer vehicles may have PWM valves, it's different than the old motors,
works like an injector (Controls air instead of fuel or something like that)

In any case, fix what's obviously wrong and give it a good visual.
Guys were also talking about manifold gaskets, but don't think they'd be
in the 'massive leak' category
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Old 31 Jan 2011, 02:42 pm
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Default Re: High RPM fault

You are probably looking at a bad TPS (throttle position sensor) or the wiring. This has been a problem for the PT and the Neon SRT-4. Most of the time it is the wire going into the TPS. If that is the case you'll need to replace the harness. You can usually tell if it is the wire by wiggling the wire and see if you get runaway rpm's. This can be embarrasing when you pull up to a stop and the engine is racing like crazy.
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