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Matt
Matt, Mechanical Engineer
Category: Mazda
Satisfied Customers: 21876
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 2000 1.8 misses intermittently. I have changed the plugs

Customer Question

My 2000 1.8 misses intermittently. I have changed the plugs and leads and fitted new fuel filter after letting fuel level run very low. Could this be a problem with the fuel pump filter?
Submitted: 1 year ago.
Category: Mazda
Expert:  Matt replied 1 year ago.
Hello you've changed sensible items I'd next check for an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and leans the engine out causing rough running. Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine running and warm and then spray lighter gas around each joint in turn. If the engine rev's up you've found your leak.Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements. It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine