heat light

[D1 WTF]

what is the heat light on the dash about.  the only time i have ever seen it was when my engine chipped a tooth, while on full boost.

last night threes up was going up a bypass, at fairly full chat in 4th, went to go change into 5th and there was a really odd noice, power dropped and the light flicker like mad.  came back into 4th and backed off absolutely, fine.  

went back into 5th, absolutley fine.  at top of bypass kept redlineing.  not a problem at all.  so it only did it this one time.  no problem with it now at all, as if it had never happened.

so what was it?

[MillSpeed]

Has your car got a PFC? Believe the PFC uses the heat light to warn of knock/detonation.

[strange_days_uk]

t\'is true that is precisely what it does

bearing in mind the knock sensor is basically a microphone in the exhaust

[MillSpeed]

Pretty sure the knock sensor is bolted to the front rotor housing just above the plugs. What sort of knock readings are you getting? (assuming you\'ve got a PFC!) It\'s also not unknown for the knock sensor to pick up other vibrations/noises not associated with detonation.

[Joeh]

t\'is true that is precisely what it does

bearing in mind the knock sensor is basically a microphone in the exhaust

I thought that was to check if you were running lean etc :O

[strange_days_uk]

I thought that was to check if you were running lean etc :O

yes it is

If you run lean and get detonation, it will "pink" and make a noise thus picked up by the microphone..

[Lum]

The power FC will give you 3 quick flashes of the heat light when it picks up a high knock reading as this could be due to det. It will also flash just once if you max out the injectors!

[flatty]

the injector duty will bring it on to if it goes over a certain%

[D1 WTF]

yer of cause, should have said.  i have power fc, t70 single tubby.  big v mount intercooler, largish street port, ported intake, bosch 044 etc

it def flashed more than once.  and the noice i heard was prob detenation thinking about it.  why would it be doing this.  

i very much doubt i would have maxed out injectors, as i have never got anywhere near.  i am running stock primarys, and 1600 secondarys i believe.  

any ideas why?

[Kash_]

what type of noise was it?

[D1 WTF]

hard to explain, but now some one mentioned it, it was prob det.  but i dont know why?  the rest of the night i was drifting around, at v.high revs and nothing

[Kash_]

if it was det, it must have been mild.... what kind of damage would mild det do to an engine? e.g. would it reduce compression or something else ?

[D1 WTF]

i am not sure, as talking to a mate and he said put it in 5th at about 30mph and if it is det\'ing (will make a pinging sound) you will here it, it is is then back off straight away and call pip.  

tried this but my car is blowing from the manifold or there abouts and all i can here is that.  hmmmmmmmm..........i dont get this.

[Kash_]

always wanted to know what happens when the engine pings, apart from the noise does the car hesitate/jerk sharply, etc?

[D1 WTF]

it just lost a little power, sort of dipped a bit.  and the heat light went mental..  all very quik, but a bit of a suprise.  especially at speed