Missfire at 3000rpm
22 January 2007, 09:39 AM
#1
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Missfire at 3000rpm
Right, I have a MY99 UK Turbo with a decat exhaust, tek 2 map, apexi ind kit, 7b plugs.
This started before I fitted the apexi induction kit, just incase anyone points to the maf (which was replaced in 04). The car also stalls when I disconnect it.
Basically, I am getting one small missfire (not fuel cut) in a very particular situation.
I accelerate away in first at normal speed, then change into second. Then I fully depress the throttle only to get a missfire when it reaches full boost at 3000rpm. It is only one missfire and is fine from then on, throughout the rev range, in any gear.
It has been there since I bought the car back in May 06.
It isn't really a problem, as I rarely floor it in 2nd gear.
I changed the plugs when I bought the car, but missfire was still there.
Anyone have any ideas??
Chris
This started before I fitted the apexi induction kit, just incase anyone points to the maf (which was replaced in 04). The car also stalls when I disconnect it.
Basically, I am getting one small missfire (not fuel cut) in a very particular situation.
I accelerate away in first at normal speed, then change into second. Then I fully depress the throttle only to get a missfire when it reaches full boost at 3000rpm. It is only one missfire and is fine from then on, throughout the rev range, in any gear.
It has been there since I bought the car back in May 06.
It isn't really a problem, as I rarely floor it in 2nd gear.
I changed the plugs when I bought the car, but missfire was still there.
Anyone have any ideas??
Chris
22 January 2007, 10:19 AM
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Not another ' Impreza trade mark '?
Add that to:
Piston slap
Hesitation when cold
Clutch judder
Uneven tyre wear
etc etc.
Add that to:
Piston slap
Hesitation when cold
Clutch judder
Uneven tyre wear
etc etc.
22 January 2007, 11:23 AM
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I was talking to my mapper yesterday and told him that sometimes my car has a slight miss coming onto boost in 5th at 3000. This may have nothing to do with your but...
I was told (and this may not be 100% accurate, my memory isnt what it was lol) that certain EU countries had regs which meant that cars needed to stay within emissions from start to a particular cruise speed. In the map he's found a situation where the ecu leans out the mixture for a very short period before richening it for boost. This causes a slight 'stutter' before full boost kicks in. He's now corrected his base maps to remove this. He's only found this in the map on UK or (european import) cars.
This is just, from memory, what I was told in a brief conversation about my next map.
I was told (and this may not be 100% accurate, my memory isnt what it was lol) that certain EU countries had regs which meant that cars needed to stay within emissions from start to a particular cruise speed. In the map he's found a situation where the ecu leans out the mixture for a very short period before richening it for boost. This causes a slight 'stutter' before full boost kicks in. He's now corrected his base maps to remove this. He's only found this in the map on UK or (european import) cars.
This is just, from memory, what I was told in a brief conversation about my next map.
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23 January 2007, 01:32 PM
#9
It's probably the cross-over point from Closed Loop to Open Loop fuelling.
Due to you having the throttle on the floor at such low revs it may be performing quite a large jump in the map when it changes modes.
It needs logging with Delta-Dash really to see where it is on the load scale and how much of a fuelling/ignition jump it is making.
Due to you having the throttle on the floor at such low revs it may be performing quite a large jump in the map when it changes modes.
It needs logging with Delta-Dash really to see where it is on the load scale and how much of a fuelling/ignition jump it is making.
30 January 2007, 10:08 PM
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I was talking to my mapper yesterday and told him that sometimes my car has a slight miss coming onto boost in 5th at 3000. This may have nothing to do with your but...
I was told (and this may not be 100% accurate, my memory isnt what it was lol) that certain EU countries had regs which meant that cars needed to stay within emissions from start to a particular cruise speed. In the map he's found a situation where the ecu leans out the mixture for a very short period before richening it for boost. This causes a slight 'stutter' before full boost kicks in. He's now corrected his base maps to remove this. He's only found this in the map on UK or (european import) cars.
This is just, from memory, what I was told in a brief conversation about my next map.
I was told (and this may not be 100% accurate, my memory isnt what it was lol) that certain EU countries had regs which meant that cars needed to stay within emissions from start to a particular cruise speed. In the map he's found a situation where the ecu leans out the mixture for a very short period before richening it for boost. This causes a slight 'stutter' before full boost kicks in. He's now corrected his base maps to remove this. He's only found this in the map on UK or (european import) cars.
This is just, from memory, what I was told in a brief conversation about my next map.
No idea what it could be now.
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