Cossie engine severe misfire (fuel starvation???)
Discussion
Hello all
I've got a Dax rush with a stage 3 tuned cossie red top engine.
i've always had a problem with fuel starvation on corners when the tank gets below a 1/3. the result being a loud bang / backfiring sound and severe (but temporary) loss of power, i have just accepted this as normal and keep the tank topped up as much as i can.
The thing is that i am now experiencing the same symptoms but in a straight line and with a full tank. i am running 18psi boost and when i hit 4500rpm on full throttle or about 5000rpm on 3/4 throttle the problems start. thinking that it was fuel pressure related i have turned the boost down to 14 psi and that has reduced the severity of the misfire.
Trouble is, i want to run 18psi+ boost!!!!!
I am wondering if anyone has any ideas where to start looking for the source of the problem and how to test any bits and pieces that need looking at. i've got a trackday coming up on the 26th july and i need to get full power back by then or i'm gonna be pootleing about without a big grin on my face!!!
There is another symptom too, the car has become increasingly difficult to start when hot!! it has now got to the point where i expect to sit around until the thing cools down a bit.
Any ideas would be much appreciated
Tim.
I've got a Dax rush with a stage 3 tuned cossie red top engine.
i've always had a problem with fuel starvation on corners when the tank gets below a 1/3. the result being a loud bang / backfiring sound and severe (but temporary) loss of power, i have just accepted this as normal and keep the tank topped up as much as i can.
The thing is that i am now experiencing the same symptoms but in a straight line and with a full tank. i am running 18psi boost and when i hit 4500rpm on full throttle or about 5000rpm on 3/4 throttle the problems start. thinking that it was fuel pressure related i have turned the boost down to 14 psi and that has reduced the severity of the misfire.
Trouble is, i want to run 18psi+ boost!!!!!
I am wondering if anyone has any ideas where to start looking for the source of the problem and how to test any bits and pieces that need looking at. i've got a trackday coming up on the 26th july and i need to get full power back by then or i'm gonna be pootleing about without a big grin on my face!!!
There is another symptom too, the car has become increasingly difficult to start when hot!! it has now got to the point where i expect to sit around until the thing cools down a bit.
Any ideas would be much appreciated
Tim.
Check your fuel filter(s) and all lines for blockages and excessive build up of dirt. Also, check your fuel pressure. If the pressure is incorrect, check your pressure-regulator settings. Also, check the vaccum supply to the regulator (if there is one). If the fuel pressure is too low, but none of the above apply, check your fuel pump(s). They do break. Other sources could be blocked injectors and / or faulty ecu-sensors (Check your ecu's fault code memory for any indication in that direction).
Hope this helps.
Felix.
Hope this helps.
Felix.
18psi? that must be mental in a rush.
what fuel pump/pumps are you using?.
the fact that the problem has got worse points to either a blockage or a pump on its way to the bin.
to cure the 1/3 tank problems run 2 pumps 1 low pressure high volume to actually move the fuel,and 1 high pressure to push it through the injectors.
18psi even makes a sierra quick,it must be great
what fuel pump/pumps are you using?.
the fact that the problem has got worse points to either a blockage or a pump on its way to the bin.
to cure the 1/3 tank problems run 2 pumps 1 low pressure high volume to actually move the fuel,and 1 high pressure to push it through the injectors.
18psi even makes a sierra quick,it must be great
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