Idle at junctions - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 21-09-10 Thread Starter
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Idle at junctions

I have a 2 litr t/s 1999 which when you stop at junctions the idle speed jumps up and then goes right down to nearly stalling then comes back to normal. When you run the car normally at idle it sits fine and is not erratic, any clues, I am new to this car and have no manuals so do not know where anything is fitted so if it is anything to dismantle or clean I will need assistance in finding it, just the name of it will probably not be enough thanks for any help it will be greatfully recieved.
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Similar problem with mine which I solved by cleaning the throttle and MAF. You can quickly check if it's the MAF by disconnecting it but I would give the throttle a clean with carb cleaner in any case. If the problem goes away after dosconnecting MAF, you know where the problem is. You can try cleaning it but I would probablu just go for a new Bosch item.
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Where is the MAF located?
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MAF sits on the air filter box (large plastic bottle on the right side of the engine).
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Get it on a Diagnostic, don't go spending money willy nilly!

The above will only be good advice if it's right!

Good luck.

ps, idle control valve/Lambda sensor...there's a few more...get an expert opinion.
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no mention of engine management light being on so why spend 40 getting diagnostics read?..would seem sensible advice to try a couple of free simple fixes first wouldn't it?
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The same thing happened to my twin spark and it's a lambda fault. Temporary fix was to do a soft reset (turn the ignition key so that all the dash lights come on, but without starting the engine. Leave for a minute. Start the engine without turning the key back towards yourself.) The engine will race ~ 1200 rpm at idle for a bit before it settles down again.

Got the fault codes read at an Alfa specialist. Nothing conclusive. Fault codes deleted. No further snags and no charge for doing it.
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Hi guys i have just bought my twinny a month ago and hav exactly the same prob with idle.. i also find it really sluggish from standstill when taking off in first gear....almost like turbo lag ....has anyone else come across this
im thinking this may all be related to MAF so i will try the simple disconnecting it first n see i suppose...
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You can clean your MAF....

Here is a quick guide...

Remove the MAF - undo the metal clips with a pair of small pliers or lever off with small screwdriver, undo the cable tie which keeps the connector cable tidy to the air duct.and then the connector remove the MAF.

There are 2 TX secrurits screws that clamps the sensor to the MAF body...these can be undone with pliers as they are not to tight.

Pull the sensor head out and stick the MAF body a bowl of luke warm water and slosh about...use a sponge to clean the inside of the MAF body but do not touch the Mesh. then put back in the bowl and leave for about 20 Mins...

To clean the sensor head you need anti-static cleaner from Maplin or any radio hobby store..

Spray liberally all over the head......

You will see a channel in the sensor head, and will notice a wire running can clean this with a cotton swab with cleaner applied.....don't go to mad just apply gentle pressure.

At the side of the sensor is a metal plate within another can clean this using the cleaner and some tissue, wedge it in the grove and slide in and can use a small screwdriver to exert more pressure to clean the plate and the edges.

The sensor heads..electonics is sealed so don’t worry too much...but still be careful.

When this is done....rinse the sensor head under luke warm running water from the tap and just cover the top part of the head where you have cleaned...

when done remove the MAF body that was soaking, test the mesh for cleanness with a cotton swab, if still dirty use the anti-static cleaner to clean more..and re wash in luke warm water.

Lay both the sensor and the MAF body...on a tea towel on a radiator to dry ...

Re-Fit the MAF all back together and put back on the car.

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idle , junctions

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