Backfire under load

Discussion and technical advice the SW20 MR2. 3S-GTE, 3S-GE, 3S-FE etc
Anything and everything to do with maintenance, modifications and electrical is in here for the Mk2.

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SpamDubz
Posts: 59
Joined: Sun Oct 21, 2012 11:35 pm

Backfire under load

Post by SpamDubz »

My 2 occasionally backfires and hesitates when coming on boost at WOT. After it's done it, it won't do it again for a while. I've noticed it's usually when I've not driven on boost for a while, any light shed on the matter would be really helpful, I'm not sure where to start.

Dan.
GreddyMR2
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Re: Backfire under load

Post by GreddyMR2 »

I would start from ignition components like spark plugs, dizzy cap and rotor arm, spark plug wires.
Martin F
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Re: Backfire under load

Post by Martin F »

What boost are you running ? If standard i would be looking at spark plugs and checking the dizzy and rotor arm for wear first.
SpamDubz
Posts: 59
Joined: Sun Oct 21, 2012 11:35 pm

Re: Backfire under load

Post by SpamDubz »

Running 1.0 bar but it backfires before I reach full boost. I've had ignition parts replaced not long a go, maybe 5000 miles a go. Do they tend to go that quickly ?

Dan.
2mad
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Location: uk

Re: Backfire under load

Post by 2mad »

Coil 8-[
GreddyMR2
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Re: Backfire under load

Post by GreddyMR2 »

Then next parts to replace - coil and igniter probably.
But you say it's backfiring not always? Then this is strange.
SpamDubz
Posts: 59
Joined: Sun Oct 21, 2012 11:35 pm

Re: Backfire under load

Post by SpamDubz »

Yeah it's not consistent, it might not even be backfiring as such, just sounds like it. It tends to do it when I've been driving off boost for a while then I put my boot down. It gets spooling then bangs once or twice hesitating when it bangs. Then all of a sudden it'll shoot off. I'll try get a decent coil and igniter off a friend and try them for a few days and see how it goes.

Another thing I've just remembered is that it started happening after I washed the car. So possibly water ingress into the engine bay on something electrical?

Dan.
gnzyza
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Location: Gloucester

Re: Backfire under load

Post by gnzyza »

Don't the coil pack suffer from water ingress where they crack :-k
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