Mazda6 1.8 petrol, (2008 model) losing power. Poor acceleration especially if climbing... I hope its not the CC's... could it be plugs and timimg?
Country: United KingdomMake: MAZDA 6Model: 6Year: 2008Engine: 1.8 petrol
This could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;
Crank position sensor
Cam position sensor
Throttle position sensor
Also worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40
and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals - so the ones for the ECU and the fuel pump
And also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.
Check the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist:
Also its worth checking that the electric pump that feeds the injectors is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12V
If none of these makes any difference then I'd do a compression check to see if the base engine is healthy and if that’s OK then get the fuel pressure checked at the injector rail with the engine running. This last one will show if the electric fuel pump and regulator are in good condition.
Also check for exhaust leaks before the o2 sensor as if this has been experiencing an exhaust leak then it will have been running very rich as the sensor will see the extra air pulled in as fresh / lean fuelling and be adding fuel to compensate.
this can lead to catalyst failure as the extra fuel can re-light inside and melt the catalyst
The best way to find an exhaust leak is to run the engine from cold and feel around the exhaust joints with your bare hands - you'll have about 30 seconds before it all gets too hot and you should feel any escaping gas blowing over your fingers
Thanks Matt- but it was a problem with the clutch-
thanks for letting me know
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you press accept at which point the cash is split between the site and the expert.
If you don't press accept then you can use the cash at a later date to ask another question.