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ECU reconditioning, ECU repair, ECU testing. New remanufactured & used ECU’s
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Cold starting again, first of all there is the choke mechanism needed to introduce extra fuel into the engine until it is warn enough to do without it. Without such a device many engines would not start at all, or if they did they would then be coughing, banging, and missing until warmed up a bit. Which was exactly the fault experienced by the owner of the Suzuki Alto so We immediately suspected either Bronchitus on the part of the owner or a non functional choke on the part of the Suzuki. Checking out the choke on the Suzuki was fairly easy since it was a carburettor model with a manual choke system. Pulling out the choke lever at the dashboard and it certainly sounded as if the choke was working fine, the engine revs increased to about 2,000 Rpm. But checking out at the carburettor end revealed a different state of affairs. The Choke cable was connected to the bit on the carburettor that controls the idle speed on choke, but the part that should have been there to connect the cable through to the choke that does the important bit of increasing the extra fuel - well, there it was, gone. Fitting a new bit put the choke back to full working order and now if the owner comes back with similar problems we shall have to refer him back to his G.P.
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Still looking at reasons for high HC levels causing an MOT failure?. An air leak via a leaky gasket,seal,or even a brake servo unit with a poor diaphragm can make the mixture so weak on one or more cylinders so that the CO will pass but the unburnt petrol left will cause an HC failure. Other non ignition faults can be incorrect valve clearances, cam timing wrong, modified camshafts, collapsed hydraulic lifters,blocked exhaust,or if the car is a Metro a design fault that causes the car to fail at idle but should pass at the allowed retest speed of 2000 RPM. Ignition faults that can cause high HC are all ones that cause either the wrong amount of spark to occur or to occur at the wrong time. Such faults can be sparkplugs gapped wrongly, faulty sparkplug(s),fouled sparkplug(s), wrong type of sparkplug, faulty HT leads, distributor cap, rotor arm,or HT coil,excessive ignition timing variation between cylinders caused by distributor wear/engine management system. Apparent sparkplug problems may have nothing to do with the sparkplugs though - a leaky head gasket, valve oil seals,or poor piston rings can all cause the best of plugs to fail.
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Hessitation, power loss. This type of problem can be one of the most time consuming faults to find because the problem often is only slight and the fault only shows up when the car is being driven under load.
One of the most commen causes of this is fouled or sticking injectors that can be reconditioned at less than tenth the price of a new set. For more information on injector servicing click on injector.
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