rallyingden
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| posted on 30/6/08 at 10:45 AM |
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20XE Pressure Regulator
Hi Guys
Just helped my lad fit a 2.0l XE redtop in his nova but though it ran sort of OK when we first started it, after stopping it it refused to start.
With a little coaxing I managed to get it to run but it sounds like its miss firing. After going through the electrics, its had new plugs leads cap
etc, I have checked the injectors are operating and have swopped the fuel lines around ( and back again )..........
Questions
Does the fuel feed come in at the pressure regulator end of the injection rail.
Could the pressure regulator & thus rail pressure give cause for this missfire.
Are the pressure regulators an OEM part or vauxhall only replacement.
Hope someone can help as I need to get rid of his car so I can get on with my build.
Cheers
RD 
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loggyboy
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| posted on 30/6/08 at 11:41 AM |
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Fuel feed is at the opposite end of the pressure reg.
(fuel comes into rail, fills, then the reg lets the fuel down the return when the rail is at the required pressure)
best way to tell that the fuel pressure is remove the back dust cap (just like a tyre) and press the release pin (stand back) and fuel will come out
if its under pressure!
Most common issue on redtop novas is wiring. THe ecu has perm power (thick red, straight to battery), the earths are on the fuel rail ,mounts (then
from the gearbox to the chassis). the last and most common is the back accessory live, this needs to be wired to an accesory supply that remains live
when cranking.
But if its fired once that shouldnt be the problem.
what fuel pump are you using?
[Edited on 30/6/08 by loggyboy]
Mistral Motorsport
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MkIndy7
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| posted on 30/6/08 at 04:14 PM |
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Aren't the Coolant Temperature sencors prone to failure on the redtop as well, Maybe it won't start when warm because of that.
Other mistakes i've made are putting the airbox back and forgetting to plug the air Flow meter in..I think it started but the throttle was just
like an on/off switch!.
Air leaks on the oval gasket between the airbox and throttle body, wouldn't idle very well etc. Same with forgetting to connect the ICV valve to
the airbox pipe.
Also the ICV (I think) the solenoid valve under the inlet manifold are prone to sticking if they've not been used in a while.. think mines doing
it now! Not sure what effect that has, I think it makes the car idle really fast when its not working or stuck but it could be the other way.
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loggyboy
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| posted on 1/7/08 at 10:02 AM |
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a faultly idle stepper motor will usualy result in an idle that dips and rises quickly as the ecu senses the car is about to stall and ups the revs
and letts them drop then revs again and so on.
Mistral Motorsport
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rallyingden
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| posted on 1/7/08 at 11:51 AM |
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Thanks for your help guys.... Just waiting on a new pressure regulator and we should be able to sort things.
RD
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