Warning heat light????

[Steve Burnett]

My heat light keeps flashing on every so often. It just flickers on from time to time but fairly regularly. The car has coolant, has had an engine rebuild and had a service (inc. coolant change within the last 3-4 months). This happens when cold and hot.
The car is a 94 FD3S.

Any ideas?

[rx7veilside]

depends under what circumstances it does it if u are giving it plenty of boost and it starts flickering then back off a bit.it is supposed to be an indication of poss detonation but best to check with one of the experts ie geoff at reworx or carl at hayward rotary

[Steve Burnett]

Its at any time, more so when trundelling along.
Im not pushing the car hard at the mo cos ive a wastegate problem (Hope its that) Car won\'t hold boost, or overboosts when very cold air. But thats another story.

[John Yorke]

The heat light also acts as a knock warning light, if you are over boosting you could be running lean.......... need I say more - rotary runs lean - detonation - no engine.
Suggest you get it to a specialist.
Other cause for heat light - blocked cat
Dont know your situation iether way you need it looked at.

[oRi]

Steve

My heat light was on and off after i changed my exhaust. Everyone i asked suggested it was reading knock.

Stu

[mrfitz]

If you have no CAT fitted, the sensor that normally detects overheat of the CAT should be taped up and not touching any part of the bodywork, if it does come into contact with the bodywork, it earths the overheat circuit causing the overheat light on the dash to illuminate.  I had this problem on mine, it was tucked away underneath the car but when I went over any bumps, the light would flicker on.  I taped it up and the problem went away.  Maybe this will sort it....

[Steve Burnett]

Car only has a back box and induction kit. The car was also recently down at WGT before this happened. Im surprised if it is a knock reading as this happens when the car is being driven at 1-3K rpm (rpm I mostly drive at due to my suspected wastegate problem) I thought it would only be running lean when the car is being pushed??

[mrfitz]

"Car only has a back box and induction kit."

Wow, must be noisy!

Have a look under the car, around the CAT or DeCAT centre section and see if you can see the sensor i\'m on about.  

Mark.

[Steve Burnett]

Will do if I can get my "heed" under the car.

[Steve Burnett]

Just spoke to Pip who said that the Apexi ECU uses the heat light as a knock warning light, but im running a stock ECU so this should not be the case.
Might be a CAT on the way out. I hope so!!

[scooby_si]

can you not keep calling Pip when he\'s doing work on my car :p lol:rollin
Hope you get it sorted i know the cat thing is prevelant so fingers crossed it is just an annoying moggy http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm46052GB\' target=\'_blank\'>http://smileys.smileycentral.com/cat/16/16_1_20.gif\' border=0> lol
Si

[Ste C]

Originally posted by Steve Burnett
Just spoke to Pip who said that the Apexi ECU uses the heat light as a knock warning light, but im running a stock ECU so this should not be the case.
Might be a CAT on the way out. I hope so!!

My light also came on now and again too. I got it looked at and found the air pump wasn`t working correctly which helps the cat from over-heating. Got the pump working again and been ok since.

Im not sure if you want your cat to be knackerd.. i got a quote for a new one with fitting...£1300!!!!!  made me feel sick!

[Steve Burnett]

How much!!! A new cat from WGT costs about £400

[Ste C]

I was given the quote by Hurley Engineering. They said it was a mazda only part, i never got one but if what you say is right  thats a hell of a difference.

[scooby_si]

Hurleys prices in making feel sick shocker http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm46052GB\' target=\'_blank\'>http://smileys.smileycentral.com/cat/10/10_2_10.gif\' border=0>
Si (not shocked......)