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Old 06-02-2007, 02:10   #1 (permalink)
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Arrow NL Idle vibration

Hi all

Recently bought an NL Concorde.

Has had this vibration when it idles, usually in Drive is most noticeable.

So far I have:

Replaced Plugs & Leads
News Rotor and dissy cap
U/S Fuel injection service (Today)

After the EFI service the car is idling better and seems more responsive.. The revs are under 2k when sitting on 100kmh now

But the vibration is still there. There is also a very slight 'miss'..

I have read in the forums here and AFF etc

I am just wondering what woul d be my next step?

One suggestion .. was the Idle Sensor thngymajig , remove it and soak it in wd40...
Cleaning the MAF but i dotn know what a MAF is...

help?
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Old 06-04-2007, 20:17   #2 (permalink)
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Re: NL Idle vibration

engine mounts?
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Old 06-04-2007, 20:26   #3 (permalink)
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Re: NL Idle vibration

Yeah another suggestion elsewhere mentioned Engine Mounts..

But a friend who lives bush now , was a mechanic at Ford and he thinks my car at 108,000 kms wouldnt be likely.

The car occasionaly runs very smooth at idle.. runs very smooth driving along and under acceleration.

The vibration is felt in the car , and cant be heard like a knock or anything.

I will have a look at the Idle sensor and this MAF thing next weekend.

Possibly even coil..
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Old 06-07-2007, 19:54   #4 (permalink)
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Re: NL Idle vibration

can you visually see the engine rocking?
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Old 06-07-2007, 22:51   #5 (permalink)
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Re: NL Idle vibration

Quote:
Originally Posted by RAVEN
can you visually see the engine rocking?
No. its not engine mounts.

The engine is smooth as a babies ass when driving real slow. its only at idle there is a slight miss and a vibration.

I have learnt that it could be just my idle .. too low.

It idles around 700 in neutral but only at about 300 in Drive or Reverse.

If i raise the idle with my foot gently up at around 600 it smooths right out.

I havent adjusted it yet as i get home from work in the dark and dont have a good light in the carport..

But question:

If i raise theidle up to 600 or 700 whilst it is in drive.. wont this mean the idle speed will be too high when in neutral?
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Old 06-17-2007, 06:24   #6 (permalink)
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Re: NL Idle vibration

Hi Shrude
Yes, your idle will be too high, and also your IAC solenoid will try to pull the idle down all the time. You will also experience harsh downshifts into first gear when slowing down, so I wouldn't touch the idle settings just yet.
Considering all you have done already, if you have a vibration ONLY and no misfire, I would suspect engine or gearbox mounts or a cracked flywheel, as suggested by Raven, but you seem positive they're OK and you mention misfire, so...
The MAF sensor does NOT influence the way a car idles at all, when it's dirty you'll notice your car seems slower than usual picking up RPM during acceleration, so I don't think this is your problem.
My next step would be to check for carbon build up inside the IAC valve and the throtle body, which is a very common problem with our crappy fuels and will give an air restriction at idle (idle too low). If this is the problem, once you get rid of the carbon don't forget to disconnect the battery for at least a couple of minutes to reset the KAM (wrong idle settings stored, etc) If this isn't the problem I'll be checking the intake manifold gasket for leaks. Spray some carby cleaner around the gasket area and look for idle quality changes (up or down)
Hope this helps, cheers
marc
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