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Discussion Starter #1
Any experiences on this one before I go playing hide and seek in the engine bay.

During this past three or four days, start the car (V6) in the morning and it fires straight away as usual but then the revs drop to about 3-400.......it doesn't die but gets close.

Recently replaced the water temp sensor and the lambda was done about 8-9 months ago (non-origonal). I'm guessing the warm mornings we're having may be confusing the poor thing or its the idle thingy?

Runs fine for the rest of the day and consumption seems normal............any ideas?

wrinx
 

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Wrinx Mine has been doing this but only first thing on a morning

I think its cos the engine is cold and the outside temp is high and its getting an ambient air reading to the sensor and confusing it as it only happens when the suns been out early
 
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Yup, sounds exaclty the same thing...........been chatting to JB and he thinks it may be the VAE, air by pass valve.

I'd never heard of it but will give it a good soaking with some carb cleaner soon :D

wrinx
 

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Could be i spose but it only happens when the suns been out so i`m gonna stick to my theory

If it still does it when it gets cooler then will suss out where the VAE is and sort it(probably with a big hammer)
 
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Discussion Starter #5
The VAE is on the rear bank, looks like a canister with two pipes coming out of it. (thanks JB!)

wrinx
 
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Had trouble with my T/S on Sunday in the blistering heat in London. It fired up but only idled very roughly on v.low revs for 30 secs before it would pick up then all was fine. Outside temp gauge said 32deg. Even got oil temp up to 90 that day with the A/C working flat out.
 
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Discussion Starter #7
I had this problem with my v6 at 100000 miles. It is the cold air regulator (I think), the gold colour thing on the back of the air box ( 3 to 4 inches long and about an inch and a half in diameter). Remove the regulator from the air box and clean with carb cleaner, you should also see a flap inside the regulator that can be opened.
I lubricated mine with wd40 before refitting and lasted for another 70000 miles before needing to be cleaned again.

Hope this is of help

Ian. :)
 
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Discussion Starter #8
Hi! I had the same problem on my 33 and now I have the same problem with my '92 q4. If it is that thing on the airbox, then how would I find it?
 
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I'm not too sure where it is on the Q4, but I have found the original artical that I used to solve my problem.
Here it is:-

Stumble when Cold
From: Tony Wood
Date: Tue, 05 Aug 1997 10:42:08
Subject: Re: stumbling 164 when cold

>
>My 1991 164 with 94,000 miles has developed an odd quirk. When the motor
>is first started in the morning, it acts as though it wants to stall. If
>I try to engage the clutch it will stall unless I apply enough accelerator
>to overcome the attempted stall. Funny thing is that after almost
>stalling the engine seems to "catch itself" and the car is ready to run.
>The computer identifies no problems and everything else seems fine. Anyone
>out there with any ideas as to a cause??

Please forgive if I quote a previous posting, but it may be simply
this:

>>Sounds like it could be the idle control valve. This valve is at the
>>back of the airbox (the big alloy box across the top of the engine on
>>fuel-injected cars), near the firewall. Its function is to admit air
>>to control slow running speed.
>>
>>Identify it by tracing a 3/4" rubber tube from near the throttle
>>butterfly to the valve, which is made of alloy, is about 2 1/2"
>>diameter and 3" long, and plugs into the back of the airbox. There
>>is also an electrical connecting plug on the end of the box opposite
>>the rubber tube.
>>
>>Disconnect everything and remove the valve, which is held in place
>>by a simple clip and 10mm bolt. Squirt carburettor cleaner aerosol
>>into the hole on the valve where it mounts to the airbox, put your
>>thumb over both holes and shake. Drain. Repeat until the fluid comes
>>out clean (clear and colourless). I find a squirt of WD40 inside
>>helps. Then remount the valve, renewing hose-clips if necessary.
>>
>>This saves you a chunk of money (because the valve is not cheap), is
>>risk-free, and works almost every time. Console yourself with the
>>knowledge that BMW owners (identical system) consider this a routine
>>replacement item!

Tony Wood
England


website link:

http://www.digest.net/alfa/FAQ/164/notes_01.htm#stumbl

Ian.
 
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Discussion Starter #10
speed freak:
Wrinx Mine has been doing this but only first thing on a morning

I think its cos the engine is cold and the outside temp is high and its getting an ambient air reading to the sensor and confusing it as it only happens when the suns been out early
Well, no problems this morning butit was cooler. Looks like there is a problem but not one that will get worse at the moment :D Will look into the the VAE and Idle valve soon tho wink

wrinx
 
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