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Damaged sensor?

 
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Old 08-22-2010, 05:47 PM
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Damaged sensor?

This problem has been bugging me for the last few days; car was running beautiful until I put about half a tank of petrol in my car the other day. I started up as usual, and the car felt as if it had lost all power and was hesitating really badly. (e.g. pull of in 1st , car nearly stalls then starts picking up then has a flatspot then goes a bit faster, I did some VTEC'ing in the hope of maybe it was just a clogged injector or something. It seemed to VTEC fine however.) Then went out later on and car was still running rough, this time CEL light illuminated and car felt extra slow but smooth surprisingly, but would probably take all day to reach 60. Put engine off then back on, run rough + slow then on the way to gym CEL light came back on. I'm not sure but I have a feeling this cheap petrol has wrecked a sensor.

Anyway I managed to use most of the fuel and filled up today with some good suff, done a 140 mile trip today, car felt fine on motorway this time no CEL light, but car still does not feel right, it hesitated when I come off the motorway earlier just when I thought it would be like new again and car still seems to hesitate when I am accelerating gradually to say 40mph for instance throttle response is extremely poor changed down a gear when approaching a roundabout and engine actually cut out for a second. Could a sensor be permanently damaged because of bad fuel as this is a very strange coincidence. (had a similar problem with my previous car) went when changed fuel though. This time it hasn't though.

I will be checking spark plugs and Distributor in the morning.

Engine condition is very good 68,000 miles on it now already done a few thousand miles in the last 2 months it has burnt almost no oil maybe 100ml maybe not even that much. All fluids are at correct levels and are clean. Gear change is also very smooth I can change with my small finger I can even change down gears with my small finger into any gear.

This problem has lost me slightly not sure exactly what it could be, wondering if anybody else has experienced a similar issue. Do excuse my poor grammar though. Help on this would be greatly appreciated.
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Old 08-22-2010, 06:29 PM
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Re: Damaged sensor?

water in the gas tank .. seen it before . you will have to pull the pump and look inside the tank with a flashlight . if there is water in there you will see what look like bubbles on the bottom of the tank . will deff cause the car to hesitate and will deff cause a cel
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Old 08-23-2010, 12:38 AM
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Re: Damaged sensor?

run a fuel system cleaner...like sea foam

and get a new fuel filter.
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Old 08-23-2010, 02:02 PM
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Re: Damaged sensor?

did you check the CEL code? To me it sounds like a bad o2 sensor, and could just be a coincidence that it started acting up when you put that cheap petrol in. My car has a bad o2 sensor right now and is slow as sh*t!
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Old 08-24-2010, 06:06 AM
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Re: Damaged sensor?

I haven't checked the code is there a way on the mk5 without taking it to a garage?, car didn't drive too bad yesterday still wasn't 100% almost as if it has nearly fixed its self, however I looked at the underside of the car and the wire to the 02 sensor does not look to be in good condition this could just be a coincidence or maybe slightly lower octane petrol has confused the possibly already faulty 02 sensor. I must give myself some time to check these spark plugs as I still have the next week of work. MOT is due in a couple of months so I don't knight rider to fail because of emmisions.
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Old 08-24-2010, 01:48 PM
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Re: Damaged sensor?

I know this sounds funny but try replacing your fuel cap, sometimes when that is worn out it messes with the performance of your car, almost like vapor locking.

When you replace the fuel cap after putting in petrol or gas, do you wind it unitl you hear it click? You need to turn it a bit to make sure that thing seals up if not then your going to throw a CEL and I can't remember but it has someting to do with the fuel expansion something or other. I would try this first as it is a simple fix and all you might have to do is turn the fuel cap around a couple more times.

Good luck,
Rob
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Old 08-26-2010, 06:38 AM
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Re: Damaged sensor?

Yeah when I close the petrol cap i always do a couple of clicks. and when the cap comes off there is always a psssssttttttt noise where the pressure has been held. I was a bit lazy yesterday in terms of car checking just had too much to do, anyhow I put some more fuel in yesterday and the car seems to be running fine again. Hopefully the car will still run good today. will be checking this sensor properly though. cheers for the replies guys.
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