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I have a 1989 1.3 HCS which I serviced a couple of weeks ago. New plugs, oil filter, oil change (magnatec gtx). Did clean the hoses to the air filter which were clogged up which in hindsight (what a wonderful thing) probably caused the problem? Since then it has been chugging when it gets to temperature - loses power from accelerator and idles erratically. Checked all hoses, changed the air filter box (waxstat hot cold diaphram arm was broken) and checked for any blockages. Can't seem to isolate the problem. Though it might be a vacuum problem but at a loss to find out where. Any thoughts?
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Having cleaned out the breather system hoses the ECU may need some time to "re-learn" how engine is running. 20-30 miles is usually enough, prefferably after a cold start on no throttle and allowing engine to warm up for ten minutes befo0re driving.
Also worth checking the vacuum hose from inlet manifold to MAP Sensor - it often falls over on itself and restricts the vacuum signal. Replace the vac hose and route / support it to avoid repeat.
HTH, Adam
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In addition to my esteemed colleagues advice I would add the possibility that the plug gaps are incorrect and should be 1.0mm which in themselves give 'interesting' idle characteristics. Also a common phenomena is that once the breathers are clear and fresh oil is installed the carb may well need richening up considerably. Ideally with a gas analyser but it can be done by turning the mixture screw anticlockwise a couple of turns and see if there is any improvement. The screw is on the back of the carb base next to a vaccuum hose but may be fitted with a tamperproof device. A tool should be available from your local factors but I strongly recommend that you have the engine emissions rechecked asap anyway.
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