This is an extract from the Daewoo service manual; Unleaded Petrol - 1.1mm 0.043inch 1.2mm 0.047inch Leaded Petrol - 0.8mm 0.031inch
I have a daewoo matiz that has low power when the engine light comes on I have changed the spark plugs/leads/distributer cap/distributer/and coil checked the timing changed the fuel filter air filter and it still looses power when the engine light comes on. You have spent a lot of money and you still have the problem. Do you not think it might be time to take it to an expert and have it repaired correctly. You would've been money ahead right at this moment.
On a 1998 daewoo matiz after doing a few jobs on it ,it wouldn't start.so i checked the spark from the dizzy cap no spark while turning the engine over. the reason turned out to be the ignition key.got another one and hey presto starts first time.if your engine is sparking then it could only be the belt timing out.so check the timing or better still get someone else to look at it as you may not see where you went wrong .ged
The electrodes of a good spark plug are sort of tan in color, and the center electrode, if there is one, has a fairly sharp edge all the way around. A bad spark plug can be black, or oily black, and the electrodes may be black-ish even down inside the ceramic where the center electrode comes out. The electrode edges may be worn down and rounded. A bad spark plug will not have a continuous path from where the spark plug wire attaches to the center electrode. This can be checked with an ohm-meter. If you're still not sure, it is best to replace spark plugs - they have a definite effect on power and gas mileage.
Lifted from a post on ToyotaNation.Does yours use the OEM twin ground platinum electrode spark plugs? They are specifically used for the later model Gen 4s (Camry) with twin coil packs and distributorless. These use a waste spark ignition, therefore the plugs fire twice during a 4 stroke cycle. If you use a single ground electrode, it will severely shorten the life of the plug. e.g. 6,000rpm on your Camry engine will be like running 12,000rpm on another car, since the plug fires twice as often. You can also try double platinum plugs, i.e. plugs with a platinum chip also on the ground electrode. What happens in waste spark ignition is that 1 coil pack fires 2 spark plugs simultaneously, e.g. cylinder 1 and cylinder 4. So while one spark plug is firing normally, spark jumps from center electrode to ground electrode, the other spark plug is firing in reverse, i.e. from ground electrode to center electrode, therefore there is high wear on the ground electrode, this is where the platinum chip on the ground electrode gives longevity. Plugs like Denso Iridium SK20R11 and VK20 also have a platinum chip on the ground electrode. NGK Iridium IX and Denso IK20 don't. BOSCH R3 Platinum2 18-3770-8 spark plug is an alternative choice. Had replaced with these spark plugs for 2 years now, so far so good. By the way, the original stock Denso plugs were still very good after 100,000 miles (160,000kms). IMHO that they could go at least 200,000 miles before needing replacement.
A piezo is just a manual, mechanical type of module. In order to work as an ignition the piezo module will need to be wired to an electrode which will spark when the piezo module is pressed or cranked. An ignition system is an assembly of parts and the piezo is like a spark generator for an ignition that does not use batteries or electricity. Pressing or turning the piezo module will send electricity to the electrode which should be mounted where gas emits from the burner so the electrode sparking will ignite gas as the gas leaves the burner.
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