Alfa 156 1.8l TS Idleing Problem? - Alfa Romeo Forum
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Alfa 156 1.8l TS Idleing Problem?

Morning All,

Right, had a spot of bother with my car this morning - it's a 156 1.8l T Spark. No, that's not the problem, before I get the smartarse

When I turned the engine over this morning, it caught immediately (as
usual), the revs went up, and then down (as usual), down past 1000rpm (not
usual) and the engine simply cut out.

Strange, I thought, and did it again. The same - the engine caught
immediately, but as the revs came down, instead of settling at 1000-1100 rpm
as it usually does, the revs kept dropping and the engine cut out.

I got out, popped the bonnet and had a quick look, there was nothin
obviously wrong. Back to the cabin, turned the engine over - this time it
started as before, but settled at about 1000rpm as usual.

I drove into work, watching my idle speed carefully where necessary - the
rev counter shows that the engine is varying more violently around the idle
mark than usual - normally it's about 1000 +/- 100rpm - now it's about 1000
+/- 250rpm - the red zone on the engine is about 750rpm so it does get close
to cutting out.

Any ideas where to start looking for the problem? The car was serviced
about a month ago, and got new belts (timing & auxiliary drive), new plugs,
and a new variator.


Mike Rovardi
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maybe a Dirty throttle body ? frown
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Got the same problem on mine, but not as serious.
If I rev mine in neutral when the engine is clod, the revs drop to about 700, bounce upto 1500, does this 3 or 4 times with each time the bouncing getting less pronounced.
Took it to Alfa and they cleaned the throttle body which fixed the problem for a few months.

There is an article on under tips which covers cleaning the throttle body for this problem.

I've done this and it seemed to help.

I have also cleaned the throttle body with a spray can of "Carb" cleaner which you just spray directly into the throttle body while the engine is running. Again this seemed to help a bit.

I put the cause of the problem done to mostly town driving (and maybe having the car chipped).

Kristian (156 2.4JTD 140BHP)
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My car had a similar problem with high idle speed. I then cleaned the throttle body and it seems to help a bit.

Here it is before cleaning:
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156 , 18l , alfa , idleing , problem

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