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Back fire when cold

Jaydej

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Hey guys I have a strange one! My car the last two time I've driven it the temp as just reached normal and I go on the motor way hit boost and I get a back fire but a repetitive one has my foot is held to the floor and then it just stops I don't feel like a lose power but it's odd any ideas oh what is the cause?
 
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the car will add more fuel as your engine is colder, every car on the planet does this, if you boost up a modified car with a stock ECU this is something to expect depending of that you have done to your car
 
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unburnt fuel in the exhaust gets ignited by flames following it out and hot spots in the exhaust and bang a flame comes out the back, a back fire is when the flames come out the intake side which is normally due to timing being out by miles was a carb engine problem from fluffing around with the timing and not following the correct marks
 

Jaydej

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Yeah I thought it was over fueling when cold I could really smell it but te back fire has only happened in the last 2 week and I've had the straight through exhaust for like 5months now that's why I thought I would post it up as it was something that seemed to be out of the ordinary for my car
 

Jaydej

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Sounds more like a misfire! So it's when you apply constant throttle you get a backfire?
That's right when my foot is to the floor and I have got full boost, acouple months ago I had a Missfire from cylinder 4 which I put down the the plug going into the coil wasn't in properly as once I disconnected it and pluged it back up the Missfire went and I never had a problem since .
 

S15_SAM

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Hmm defo missfire or maybe boost leak!

Does it happen everytime when cold? Is it when its coming on boost? or full boost? or a certain rev range?
 

Jaydej

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No I drove it twice today from cold and never happened in the last 10 times I've driven from cold it's only happened twice. It's a really strange one
 
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