Subaru impreza RB5

[RB5Steve]

Can anybody help.
On my way home from the Midlands Subaru owners club meet at Curborough sprint course my RB5 developed a misfire, was OK while driving at a decent speed, but when I was in slow traffic, ie, third and fourth gear it started to misfire, a quick blip on the throttle with the clutch down cleared is with a good pop and bang, when I got moving again all was OK, but the same thing happened when in slow traffic again. It's done it a few times before, mainly in hot weather and on a long run! I had the leads, plugs and MAF change last year, so it can't be them. Has any body any idea's. As I say. It doesn't happen all of the time. I'm wondering if the fuel pump is going faulty! Or possibly the full filter?

[E-bmw]

As you are flowing less fuel at lower revs I wouldn't think an issue with either would show itself at low revs but be fine at higher revs.

[RB5Steve]

Yes. It happens in slow moving traffic at low revs. I noticed that, then when you drop the clutch and revs it, It pops then clears its self, but only to start doing it again when in slow traffic.

[RB5Steve]

The ignition pack was renewed last year as well. It only seems to do it in hot weather?

[stevieturbo]

RB5Steve said:

Can anybody help.
On my way home from the Midlands Subaru owners club meet at Curborough sprint course my RB5 developed a misfire, was OK while driving at a decent speed, but when I was in slow traffic, ie, third and fourth gear it started to misfire, a quick blip on the throttle with the clutch down cleared is with a good pop and bang, when I got moving again all was OK, but the same thing happened when in slow traffic again. It's done it a few times before, mainly in hot weather and on a long run! I had the leads, plugs and MAF change last year, so it can't be them. Has any body any idea's. As I say. It doesn't happen all of the time. I'm wondering if the fuel pump is going faulty! Or possibly the full filter?

It could be many things, and just because something was replaced last year, does not mean it cannot be faulty now.

It really needs someone competent to check things on the car and hopefully the problem can be replicated during any test.