Fueling Problem On Cosworth..UPDATE 24.03.10 ECU question
#1
Fueling Problem On Cosworth..UPDATE 24.03.10 ECU question
right iv got a fueling problem on my 3dr cosworth wot its doing is when the car is nise and warm i can set the fueling on the ECU with the help of my stack AFR gauge and set it to about 14.7 / 14.4 and the fuel reg is running at 3bar and 3.5bar with the pipe of . so then i go for a drive and bring it onto boost and bang it back fires like a dog and the AFR gauge is in the RED very very lean i pull up and the AFR setules in the mid 12,s i then pull off and it gose very lean till im just hovering the gas . pull up and the fueling is in the RED again very lean .iv just done a test on the wires running the FPS and the MAP and the wires are all good the car is on its second fuel reg which is holding pressure good as i have a gauge which i can see wot the fuel pressure .
SO WOT DO YOU THINK IT COULD BE THEN
SO WOT DO YOU THINK IT COULD BE THEN
Last edited by COLEYST200; 24-03-2010 at 09:23 PM.
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#8
Too many posts.. I need a life!!
I've got an exact problem like yours mate,i've changed the 3Bar Map sensor,FPR is fine as is fuel press. undre load,pump voltage is 13+volt.
I'm thinking that my PLX r-500 wideband isn't all that accurate,i've got 8 injectors but the dam car is always lean??.
I'm waiting for my MSD wasted spark kit to see if i can rid myself of a dangerous missfire aswell...
I'm thinking that my PLX r-500 wideband isn't all that accurate,i've got 8 injectors but the dam car is always lean??.
I'm waiting for my MSD wasted spark kit to see if i can rid myself of a dangerous missfire aswell...
#9
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Check the TPS operation too...
Most chips add additional fuel based on throttle position and if it isnt working properly it can lean off the map.
(Usually 80% or more open)
Overfuelling, missfires and leaded fuel will reduce the life of a wideband sensor drastically.
Get the sensor calibrated (Most sensors have an open air quick calibration facility)
Most chips add additional fuel based on throttle position and if it isnt working properly it can lean off the map.
(Usually 80% or more open)
Overfuelling, missfires and leaded fuel will reduce the life of a wideband sensor drastically.
Get the sensor calibrated (Most sensors have an open air quick calibration facility)
#10
Right bit of a update we have been working on the car all night and this is wot we have done.
put a new map sensor ............it did make the car run better and the AFR was better
but still not right
new TPS
but still not right
new fuel reg
still not right
new plugs with a gap of 0.6mm
still no good
and for the last thing on the list the pump wire which we did Xmass and it was ok then
well when the car is on tick over we have 11.8v and still 11.8 when driving
so we ran some wire in the car but it was only 1mm but it did lift the volts to 12.6 the car still ran shit we then put the volt metre on the wire coming from the battery and that was showing 13.8 so we are down on the volt at the pump now . so we are going to have to rewire it this weekend and get a new map sensor of MATT LEWIS
Now do i have to spend Ł40/Ł50 on a pump wire kit or dose some one have the info on wot to do and sizes of wire to do this job
put a new map sensor ............it did make the car run better and the AFR was better
but still not right
new TPS
but still not right
new fuel reg
still not right
new plugs with a gap of 0.6mm
still no good
and for the last thing on the list the pump wire which we did Xmass and it was ok then
well when the car is on tick over we have 11.8v and still 11.8 when driving
so we ran some wire in the car but it was only 1mm but it did lift the volts to 12.6 the car still ran shit we then put the volt metre on the wire coming from the battery and that was showing 13.8 so we are down on the volt at the pump now . so we are going to have to rewire it this weekend and get a new map sensor of MATT LEWIS
Now do i have to spend Ł40/Ł50 on a pump wire kit or dose some one have the info on wot to do and sizes of wire to do this job
#11
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all you need to do is take a 12v feed direct off the battery with a decent gauge wire (cant tell you the size off the top of my head) with an in line fuse of (cant remember that rating either lol) and take it to the back of the car, where in the spare wheel well there is a red/black wire which is your ignition feed. You need to connect this to a new relay of about 20A rating i think and then make an earth to complete the circuit. Pretty simple really, but by the time youve sourced the relay, crimps, wire, heatshrink you might as well save some time and spend another 15-20 quid and buy one thats ready to fit with instructions. HTH
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If you can get over 12.5 volts at the pump then it is my opinion you wont improve its output by running thicker wire to a signicant degree.
Have you checked the fuel pressure is correct for the boost at high rpm ?
Have you checked the fuel pressure is correct for the boost at high rpm ?
#20
Right im been working on the car again tonight . Iv put a brand new 3bar map on put a brand new rewire kit on the car . set the faze to .25 . Put the boost down to 15/16psi and its still poping and banging . iv only got one more thing i can swop out as ( Lambchop ) said do the filter which i will get a new one tomorrow the filter that is on the car has only done 4,000 miles but im will to try any thing as im pulling my hair out now as the car has had a fult like this from day one but it dose come and go but it has the fult 80% of the time .
we have changed
map sensor
tps sensor
fuel reg
chip
injectors
plugs set at .7mm and now at .6mm
ht leads
the car has wast spark now but the fult was there befor and its still here now
new crank pully
crank sensor set at .8mm
all wiring has been belled out and OK
new pump 044
new pump wire kit
phase has been tested OK and set at .25mm
fuel tank new when i built the car so 2 years old
fuel filter new when i built the car 4,000 miles
we have changed
map sensor
tps sensor
fuel reg
chip
injectors
plugs set at .7mm and now at .6mm
ht leads
the car has wast spark now but the fult was there befor and its still here now
new crank pully
crank sensor set at .8mm
all wiring has been belled out and OK
new pump 044
new pump wire kit
phase has been tested OK and set at .25mm
fuel tank new when i built the car so 2 years old
fuel filter new when i built the car 4,000 miles
#21
PassionFord Post Whore!!
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stupid question but when it backfires does it jolt the car really violently too?!
If yes have u checked the inlet for an air leak at all?! my last cossie had split on the inlet plenum gasket and that caused it to randomly jolt and backfire for no reason!!
Changed it and all was good....
If yes have u checked the inlet for an air leak at all?! my last cossie had split on the inlet plenum gasket and that caused it to randomly jolt and backfire for no reason!!
Changed it and all was good....
#23
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we have changed
map sensor
tps sensor
fuel reg
chip
injectors
plugs set at .7mm and now at .6mm
ht leads
the car has wast spark now but the fult was there befor and its still here now
new crank pully
crank sensor set at .8mm
all wiring has been belled out and OK
new pump 044
new pump wire kit
phase has been tested OK and set at .25mm
fuel tank new when i built the car so 2 years old
fuel filter new when i built the car 4,000 miles
#26
hi lads iv tuck the fuel filter of the car tonight i cut it open with a pipe cutter then put it in a glass jar with some clean fuel in it then gave it a shake and this was the result 4,000 miles thats all its done . im just trying to get a new one for the car then we can see if it will solve the problem or not
#36
It Wasnt Me!
if the filters like that then the tank must be pumped as chopsky sais.....
new tank from dingbro is like 55quid, recently fitted a brand spanker to an XR4i
new filter is probably just going to clog up and do the same.
That could have been diagnosed in a RR session, Ł60 instead of buying that whole list of new parts! (if thats the prob)
Still, hopefully it'll be fixed this time mate
new tank from dingbro is like 55quid, recently fitted a brand spanker to an XR4i
new filter is probably just going to clog up and do the same.
That could have been diagnosed in a RR session, Ł60 instead of buying that whole list of new parts! (if thats the prob)
Still, hopefully it'll be fixed this time mate
#38
just a quick on iv got a check sheat that we have been using to try and find the fult with my 3dr cosworth and one thing that came to light tonight was this . PINS 24. AND 25. SHOULD HAVE 4.5 VOLTS . Well i have 1. volt on tick over and 3.5 volts at 5,000rpm dose any one no or think it could be my ECU at fult or are the readings ok . have a look on this sheat which was sent to me by RYAN Car Looms UK . LOOK at number ( 16 )
#39
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LOL, I wrote that
The voltage readings for item 16 can ONLY be measured with the engine stopped as mentioned in Item 9
Also, Item 16 it should read IGNITION and not INJECTION so thats a very old copy but I probably wrote it out quickly on an old thread.
The voltage readings for item 16 can ONLY be measured with the engine stopped as mentioned in Item 9
Also, Item 16 it should read IGNITION and not INJECTION so thats a very old copy but I probably wrote it out quickly on an old thread.
Last edited by ECU Monitor Enthusiast; 24-03-2010 at 09:46 PM.