strange noise......det?....cel?
31 January 2012, 10:00 PM
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strange noise......det?....cel?
just been driving my car....classic 98 sti type r with jdm sti 9 motor.
been running perfect since build,but tonight i heard a very strange noise which sounded almost like a metally,gritty sound from engine.almost fluttery.thought nothing of it,then i heard the sound again and started to worry,then i heard it blatenly and tickled the throttle like a feather as it threw a cel shortly after and i knew something wasnt right,before this all my driving was nice and steady as roads were icy....kepping revs low and cruising gently,i put it under a small amount of load in 5th gear(3 quarters throttle) a couple times.50-70mph ish.
my first thoughts are possible maf,it runs the orange lable maf.or maybe something to cause it not to run right,i turned engine off,had a look under bonnet with oil and water all fine,no visible problems,(although it was dark and my torch was not great).
i then had to get home so i started it back up,cel flicked on again,then went out but the initial firing up of engine didnt sound quite right?
almost like engine was not firing as strong or something.
i featherd it home and didnt exceed 3rpm,and stayed below 40mph.
it got home with no funny noises and no more cels........but now im worried!
any thoughts? what does det sound like?
no knocking whatsoever but im still very worried.
been running perfect since build,but tonight i heard a very strange noise which sounded almost like a metally,gritty sound from engine.almost fluttery.thought nothing of it,then i heard the sound again and started to worry,then i heard it blatenly and tickled the throttle like a feather as it threw a cel shortly after and i knew something wasnt right,before this all my driving was nice and steady as roads were icy....kepping revs low and cruising gently,i put it under a small amount of load in 5th gear(3 quarters throttle) a couple times.50-70mph ish.
my first thoughts are possible maf,it runs the orange lable maf.or maybe something to cause it not to run right,i turned engine off,had a look under bonnet with oil and water all fine,no visible problems,(although it was dark and my torch was not great).
i then had to get home so i started it back up,cel flicked on again,then went out but the initial firing up of engine didnt sound quite right?
almost like engine was not firing as strong or something.
i featherd it home and didnt exceed 3rpm,and stayed below 40mph.
it got home with no funny noises and no more cels........but now im worried!
any thoughts? what does det sound like?
no knocking whatsoever but im still very worried.
31 January 2012, 10:02 PM
#2
Engine Specialist
Det if you hear it with your ears when driving is extreme, but sounds like a loose nut or bolt rattling around in the engine.
Are you running an after-market ecu?
Graham
Are you running an after-market ecu?
Graham
31 January 2012, 10:18 PM
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Engine Specialist
It should have flashed 3-4 times for a preset length of time, evades me how long without looking at the default setting. I would get it checked if you think it may have been det.
Graham
Graham
31 January 2012, 10:22 PM
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its certainly not the noise of a failure as i know exactly what that sounds like,but i dont want to start it or drive it as im worried the dreaded knock will appear.
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05 February 2012, 03:59 PM
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update.....been fine for a few days,and the noise appeared again today during gentle driving,monitoring knock level and it was 38....something definetely wrong with it,but what? any ideas? engine still sounds fine but im very concerned as to wether i should be driving it or not?
05 February 2012, 04:54 PM
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05 February 2012, 05:46 PM
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Its a question i always ask now after having several previous cars i have owned behaving badly after a refuel. If you have filled the tank you may have a few days more torture yet, get the car checked but dont spend any money until fuel is ruled out. Good luck.
Last edited by madmarx; 05 February 2012 at 05:47 PM.
05 February 2012, 06:24 PM
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If i thought my car was suffering with Det due to bad fuel i would whack in some octane booster just to cover the bad fuel issue.
Since refuelling have you thrashed the car, to cause any mechanical issues ?
Since refuelling have you thrashed the car, to cause any mechanical issues ?
it's doesn't breed there 
hence 'bad batch'
05 February 2012, 06:42 PM
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[QUOTE=madmarx;10471327]If i thought my car was suffering with Det due to bad fuel i would whack in some octane booster just to cover the bad fuel issue.
Since refuelling have you thrashed the car, to cause any mechanical issues ?[/QUOTE
no,only steady village driving.
Since refuelling have you thrashed the car, to cause any mechanical issues ?[/QUOTE
no,only steady village driving.
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