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Hi I have a mazda eunos 30x coupe automatic 1.8l K8 DOHC that has a problem with fowling plugs almost every 100km (originally thought it might be wrong temperature plugs but i got a new set and there correct, my first set did about 800km then fowled), surging, excessive fuel consumption(160 km half a tank), extremely poor acceleration, backfiring, basically just being a B***H. i have replaced the timing belt/tensioners/water pump/plugs/leads/distributor cap/air cleaner element/fuel filter/ auto filter / oil filter as the car was neglected when i picked it up. also there is a sensor attached to what appears to be a thermostat housing at the top radiator house where the radiator cap is that has no corresponding plug in the harness that i can find. If you guys have any ideas that could fix this problem it would be greatly appreciated as it is doing my head in and i am hoping to avoid taking it to an auto electrician.

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  • Sarah Cole
    Sarah Cole Oct 21, 2013

    Also ive been told the compression is good 155-160 all round and also have used injector cleaner every second tank


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Really not enough info on the the car like what year it is and how many miles are on the car and More importantly, Did the timing belt break on you or did you replace it at the 80K miles as most cars Should..

But,, I would ...
1 Check Compression for each Spark plug,
2 Check the EGR valve, "If stuck open or closed you get a lot of problems..
3, Also sounds like you might have some what or an Vacuum leak..

However Something sounds wrong Since I would assume that a shop did the Timing belt/chine in the first place, Your timing belt Could have pit in 180 degrees off, Your car will run and drive But it will 95% of the time Give the problems your having.. Good luck.. BCB...

Posted on Oct 21, 2013

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SOURCE: 1992 geo convertable bad gas mileage

Sounds Like You May Have A Leaking Head gasket Try Some Fix A Gasket Solution From Your Local Auto Part Store. Also Pick Up Some Fuel Additive For Cleaning Your Injectors You'll See A Total Difference. And You Said Fault Lights Are Flashing Or Arent? In The Case That They Are Try What I Suggested Then Reset The Dash Lights By Unhooking The Battery For A Minute Then Plugging It Back In.

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SOURCE: Poor Fuel Consumption 2001 V70 T5 Post Seal Change and Timing Blt

Do you remember by chance speed vs RPM before & after work done? for example : before was 2000 RPM @ 60 MPH. Now 2200 RPM @ 60MPH ? May be coincidence, and transmission not shifting to overdrive or high gear.

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SOURCE: have 96 geo metro 1.0

wiring pcm or ecu

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SOURCE: overheating and boiling in the overflow reserve tank

replace radiator cap system depends on good pressure to keep from overheating

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SOURCE: GM Daewoo Kalos - Excessive fuel consumption 15L/100km

o2 sensor bad or ,dirty or clogged injectors hope this helps

Posted on May 09, 2010

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