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[harry3553]

Hi, recently purchased 2.0 8v automatic 1997 but since going out to supermarket tonight its running lumpy on tick over at about 500 rpm and when i reversed, it cut out twice, it also drives lumpy sort of wanting to go but holds back, not really bad but you can hear it irregular, any ideas?

[Auto Addict]

First thing to do is clean out the breathers and throttle body, see 'Maintenance Guides' section.

Also, remove the Ecotech strip, and check for Oil/Water in the plug wells.

[harry3553]

Thanks for reply I will clean those items tomorrow on day off, after running it today though ive noticed that this problem only starts when the engine is warm so could this be something different? also this engine is the 8v not the 16v ecotech

[Kevin Wood]

If it's fine when cold it could be down to the coolant temperature sensor. This could be telling the ECU that the engine is cold when it's hot and consequently it's over fuelling.

Idle Control Valve is another possibility I'd say. Does it run alright under load and just messes about at idle or is it lumpy at all speeds?

Have you checked for fault codes in the ECU?

Edited to say: Try measuring the resistance of the coolant temperature sensor with a multimeter when the engine is both stone cold and hot. I'm guessing here as I'm not familiar with that sensor but it will probably read down in the hundreds of ohms when fully warmed up and significantly higer resistance when hot. Also check the connector for signs of corrosion, etc.

Kevin

[harry3553]

Its fine when cold, and when at temp its really lumpy on tick over but when i accelerate it seems fine, plenty of power, just seems as though its guna cut out at anytime at junctions. I ve had my mates code reader on it just now and its coming back clear so ill probably have to take it to a garage tomorrow as i dont have a tester for the coolant sensor and without a manual yet i dont even know where it is, thanks for the info will let you know how it goes.

[Marks DTM Calib]

If its got no fault codes stored then concentrate on the ignition system first...check the leads, the plugs and the DIS pack.

[harry3553]

Had another go at car today before it goes to garage on tuesday, ive replaced plugs, leads and cleaned breather pipes, replaced air filters, but still same, refering back to what kevin said,about the idle control valve, ive heard these can be cleaned out? Is this possible and has anyone any pics or info on it? many thanks

[cem_devecioglu]

Yep.They can be cleaned with carb cleaner..

http://www.omegaowners.com/forum/YaBB.pl?num=1194007453

[harry3553]

Thanks for that info really useful, what i have tried tonight before i dismantle is take the small pipe off as deacribed and it has good suction so maybe the jet isnt blocked but i will give it a clean anyway, thanks

[cem_devecioglu]

More thanks to Grumpy ..He has done really good job..

[harry3553]

Hi , Im certain ive found problem, last night id left it running and when i came out there was loads of steam out of exhaust, just put it down to damp wet night, on way to tesco today temp went really high, pulled over before it went into red and left to cool and there was hardly any water in system, took oil cap off and it was white, so head gasket has gone. Now when i bought this car 2 weeks ago he produced a receipt saying it had had a new water pump 1000 miles earlier, when i got it home i could see car dismantlers yellow paint on the head so presumably hed replaced the head so he must have boiled it when the water pump had gone, so what do i do now? do i have this head skimmed? i really dont want to get stung by a garage, can any one predict how much this will cost? any help/advice very welcome, Harry.