HELP With Missfire @ 6000 rpm and checked everything to sort it.
14 August 2005, 12:59 PM
#1
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HELP With Missfire @ 6000 rpm and checked everything to sort it.
Hi all
1st of all i want to tell you a problem we had at donnington the time
before last which i think must have something to do with why its not
running ok.
My brother was going down the straight coming into the 1st corner and i
heard a backfire out of the exhaust and he came straight back saying
there's no power and its not firing on all.
The car came back to the pits i phoned my guy dave @ (JD Performance)and he said don't drive it so we had the car taken back on a transporter.
What had happened was that it had backfired through the inlet manifold
and blown the bottom pipe off the map sensor and made it over fuel and
the car would misfire at 4-5000 rpm on gentle throttle.
At 1st we thought it might of been fuel surge but the car had nearlly a full tank.
Once the pipe was refiited it seem to be fine but at the last outing the car backfired after 6000 rpm like the car had fuel cut.
Whats happening now is that when you feed the throttle down on free revs it gets to 6000 rpm it missfires and sounds like the car is on the rev limit.
All the below has been checked individually
Cam sensor
Crank sensor
Plugs
Leads
fuel pump +pressure+filters
Coil pack
Igniter
all individually
All the electrics are being checked monday.
Thanks
R.B
1st of all i want to tell you a problem we had at donnington the time
before last which i think must have something to do with why its not
running ok.
My brother was going down the straight coming into the 1st corner and i
heard a backfire out of the exhaust and he came straight back saying
there's no power and its not firing on all.
The car came back to the pits i phoned my guy dave @ (JD Performance)and he said don't drive it so we had the car taken back on a transporter.
What had happened was that it had backfired through the inlet manifold
and blown the bottom pipe off the map sensor and made it over fuel and
the car would misfire at 4-5000 rpm on gentle throttle.
At 1st we thought it might of been fuel surge but the car had nearlly a full tank.
Once the pipe was refiited it seem to be fine but at the last outing the car backfired after 6000 rpm like the car had fuel cut.
Whats happening now is that when you feed the throttle down on free revs it gets to 6000 rpm it missfires and sounds like the car is on the rev limit.
All the below has been checked individually
Cam sensor
Crank sensor
Plugs
Leads
fuel pump +pressure+filters
Coil pack
Igniter
all individually
All the electrics are being checked monday.
Thanks
R.B
14 August 2005, 06:35 PM
#2
Scooby Regular
Originally Posted by R.B
Hi all
1st of all i want to tell you a problem we had at donnington the time
before last which i think must have something to do with why its not
running ok.
My brother was going down the straight coming into the 1st corner and i
heard a backfire out of the exhaust and he came straight back saying
there's no power and its not firing on all.
The car came back to the pits i phoned my guy dave @ (JD Performance)and he said don't drive it so we had the car taken back on a transporter.
What had happened was that it had backfired through the inlet manifold
and blown the bottom pipe off the map sensor and made it over fuel and
the car would misfire at 4-5000 rpm on gentle throttle.
At 1st we thought it might of been fuel surge but the car had nearlly a full tank.
Once the pipe was refiited it seem to be fine but at the last outing the car backfired after 6000 rpm like the car had fuel cut.
Whats happening now is that when you feed the throttle down on free revs it gets to 6000 rpm it missfires and sounds like the car is on the rev limit.
All the below has been checked individually
Cam sensor
Crank sensor
Plugs
Leads
fuel pump +pressure+filters
Coil pack
Igniter
all individually
All the electrics are being checked monday.
Thanks
R.B
1st of all i want to tell you a problem we had at donnington the time
before last which i think must have something to do with why its not
running ok.
My brother was going down the straight coming into the 1st corner and i
heard a backfire out of the exhaust and he came straight back saying
there's no power and its not firing on all.
The car came back to the pits i phoned my guy dave @ (JD Performance)and he said don't drive it so we had the car taken back on a transporter.
What had happened was that it had backfired through the inlet manifold
and blown the bottom pipe off the map sensor and made it over fuel and
the car would misfire at 4-5000 rpm on gentle throttle.
At 1st we thought it might of been fuel surge but the car had nearlly a full tank.
Once the pipe was refiited it seem to be fine but at the last outing the car backfired after 6000 rpm like the car had fuel cut.
Whats happening now is that when you feed the throttle down on free revs it gets to 6000 rpm it missfires and sounds like the car is on the rev limit.
All the below has been checked individually
Cam sensor
Crank sensor
Plugs
Leads
fuel pump +pressure+filters
Coil pack
Igniter
all individually
All the electrics are being checked monday.
Thanks
R.B
15 August 2005, 05:28 PM
#6
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Regards the plugs it did have 8`s in now had 6`s no change
Update
Did a skope test today on the cam sensor and the missfire appears at 3000 rpm and not 6000 at the ecu.
R.B
Update
Did a skope test today on the cam sensor and the missfire appears at 3000 rpm and not 6000 at the ecu.
R.B
Last edited by R.B; 15 August 2005 at 06:49 PM.
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16 August 2005, 05:28 PM
#8
Really silly but possibly overlooked. I am running 334 bhp and had a similar problem. Have you gapped the plugs correctly. Mine got gradually worse changed the plugs and gapped the new ones to 0.6mm and have never looked back.
Sorry if you already checked the plug gaps but new ones have to be gapped rather than just put in out of the box.
Sorry if you already checked the plug gaps but new ones have to be gapped rather than just put in out of the box.
Last edited by dazdavies; 17 July 2006 at 11:12 PM.
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