Dave Bailey
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| posted on 22/8/10 at 12:51 PM |
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Starting Problem
Hi guys just looking for some inspiration....
Engine Spec...
Subaru Impreza In tank fuel pump
ST170 Engine dry sumped
Jenvey individual throttle bodies with 90mm trumpets
DTA ECU
Sard Fuel regulator
O.k. now the challenge... The car will start but idles like a pig then stalls
When you touch the throttle it stalls
If you give it a bit of throttle then the cars starts sound o.k. but then dies.
I have 3.0 Bar fuel pressure but don't seem to get any more that this...
any ideas?
thanks
Dave Bailey
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interestedparty
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| posted on 22/8/10 at 01:28 PM |
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What is the fuel pressure supposed to be?
has it ever run properly with that setup?
has it been mapped?
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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Dave Bailey
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| posted on 22/8/10 at 02:04 PM |
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Not sure about 3 bar I think...
No never been run
No not yet I am using the STD st170 map in the DTA software with closed loop. I have an innovate wide lambda fitted.
Dave B
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rusty nuts
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| posted on 22/8/10 at 02:16 PM |
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Sounds like it's running too weak? whip the plugs out to check . Check the coolant temperature sensor and wiring? check for air leaks , add
more fuel if you can
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matt_gsxr
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| posted on 22/8/10 at 03:36 PM |
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if you open the throttle and it stalls, then that normally means that there isn't enough fuel being added. Has the TPS been properly
calibrated?
Rough idle could be lots of things. Do all the headers heat equally? or is it running on the same 1 or 2 cylinders.
I agree with the above suggestions, add some more fuel and see if that helps (if the temp sensor is too high then the ECU might be adding insufficient
fuel, but in this weather this isn't as big an effect as in winter).
Are the throttle bodies balanced (not sure how this works with Jenveys). Once its running it would be good to check.
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Dave Bailey
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| posted on 22/8/10 at 07:11 PM |
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I think my problem is associated with not being able to maintain pressure at the rail.... I have a Subaru fuel pump that is supposed to be good for
300 HP but I can't get above 3 bar at the rail.. Just opened the top of the tank up and I can see that either the hose off the top of the pump
is leaking or the pump has a pressure safety valve which I suspect it has.... I need to work out how the system should work... I have 6mm fuel lines
and I'm concerned that the pump pressure needs to be higher than the safety valve on the pump to maintain 3 bar at the fuel rail.... At least it
starts I suppose!
Dave B
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Dave Bailey
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| posted on 25/8/10 at 07:05 PM |
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What a feeling.... I had two issues... a bad plug then I found out that the sequencial injection run off the cam sensor had the wrong angles... So
turned off the sequential injection and she runs like a dream... I'll get a video up as soon as I can.
Dave B
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