190 lumpy idle

[94mattda]

Hello, I have a 1.8 auto 190 93 plate. It's done 104k but has a slight lumpiness on idle and slightly low with fluctuation on start up. Can anyone suggest where to start please, I thought plugs, leads, distributor etc

 

[Dieselman]

I would check the distributor cap and rotor arm, then suspect an air leak into the induction system.

 

[94mattda]

Thank you, will have a look tomorrow for air leaks and get new distributor cap and rotor arm

 

[Mondorich]

How did you get on?

When I bought my 190 last year I had a lumpy and hunting idle which was fixed by having the injection system "serviced". This involved the use of a long hex key by my mechanic - only the second time he's used it apparently because he hadn't had a mechanical injection car in for years.

Needless to say, this fixed the issues and it has run smoothly ever since.

 

[horatio]

Also could be the idle valve. A good soak overnight in meths can unclog it.

Don't forget to check the vacuum pipe that runs under the plenum etc, it can deteriorate without you noticing.

 

[SL300-24]

Is it an fuel injection car or carb?

 

[Will]

Is it an fuel injection car or carb?

A 1993 1.8 car will be injection.

Could be so many things - hard to tell without looking. I'd check the basics - distributor cap and rotor, leads etc.

1.8 M102s like a head gasket too..

Does the idle speed change when it's warmed up - thinking OVP relay etc?

 

[SL300-24]

Cheers Will....I missed the 1993! Thanks for the under tray BTW.

 

[94mattda]

Can't see any air leeks. May change the bits mentioned above and see if the helps. Thanks for the replies so far

 

[94mattda]

Changed my distributor cap and rotor arm and the car is running a little better on start up. On initial start up in the morning or after a long period of standing for the day it tends to start up but idles rough and stalls, with a gentle repeated coaxing of the accelerator it runs ok, i am thinking the automatic choke?? any ideas or pointers.