ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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A video speaks a thousand words. The engine is supposed to have a 2.5 bar FPR on it. Safe to say its humped?
Just want to verify this before I change it, just in case there could be another explanation / cause...
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mk2cossie
Club Retro Rides Member
Posts: 2,946 
Club RR Member Number: 77
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Rover V8 EFI Fuel Pressuremk2cossie
@mk2cossie
Club Retro Rides Member 77
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Engine running and vacuum pipe off the regulator?
If so, then that is a tad low
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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Vac pipe on actually.
Normal behaviour for priming? (2.5 bar on pump then drop to 2 bar once primed?)
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squonk
Part of things
Posts: 855
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Flapper or hot wire?
From the service manual:
The fuel pressure regulator is mounted in the fuel
rail at the rear of the plenum chamber. The
regulator is a mechanical device controlled by
plenum chamber vacuum, it ensures that fuel rail
pressure is maintained at a constant pressure
difference of 2.5 bar above that of the manifold.
When pressure exceeds the regulator setting excess
fuel is returned to the fuel tank.
Note: 2.5 bar above that of the manifold.
To measure it properly you also need to measure the manifold depression and then look at the difference between that and the fuel pressure. Looks like its probably working Ok.
What has caused you to believe that you have a problem?
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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Neither, Megasquirt. My lambda is all over the place on idle, so part of me suspected this...
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squonk
Part of things
Posts: 855
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Same rules apply, If its the standard FPR it should behave in the same way.
I'd be more inclined to blame it on air leaks somewhere. Could be a perished vacuum pipe or a leak in the exhaust system.
I had the same problem on a Rover 620Ti. Turned out to be a small leak in the exhaust.
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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Now I'm more confused, how would an exhaust system leak cause the idle to hunt?
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squonk
Part of things
Posts: 855
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If it's screwing up the lambda reading the ECU will be trying to compensate for it.
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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Hmm, interesting point. I don't *think* its the cause but I haven't looked. I'll add it to the list though.
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mk2cossie
Club Retro Rides Member
Posts: 2,946
Club RR Member Number: 77
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Rover V8 EFI Fuel Pressuremk2cossie
@mk2cossie
Club Retro Rides Member 77
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I know the wedge boys have trouble with original fuel pressure regulators on their rover v8s. They replace them with adjustable ones but I don't know what pressure they then run them at  With regards to the fluctuating idle, if it is an air leak on the inlet or exhaust manifold side, have you got idle control via AFR on? If so, try it with it off and manually adjust it to see if it behaves then  Or use the old wd40 squirted around gasket faces to see if it evens the idle out |
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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I am warming to an aftermarket FPR, and I'll probably just bang 3 bar on it and be done with it.
Idle control is via the original stepper motor which the MS2 is talking to, as far as i know the AFR idle is on although for the life of me I'm not sure where the function is on Tunerpro...
Already tried the WD40 trick, the vac leak likelihood is low, but never say never...
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squonk
Part of things
Posts: 855
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I am warming to an aftermarket FPR, and I'll probably just bang 3 bar on it and be done with it. Idle control is via the original stepper motor which the MS2 is talking to, as far as i know the AFR idle is on although for the life of me I'm not sure where the function is on Tunerpro... Already tried the WD40 trick, the vac leak likelihood is low, but never say never... One of my Range Rovers has an RPi supplied aftermarket regulator, the other a standard one. There appears to be no discernable difference in their performance. The stepper motors on these are notorious for causing idle issues through sticking or leaking. I'd disconnect it and see what happens to the idle. I'd also check for leaks at it's gasket. Do you even need it with this ecu? |
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
|
Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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Yea I've actually put a new stepper motor in for that very reason. Not sure if I could get away with removing it, I suspect maybe but I've not go the knowledge to do it!
The cars going into the big unit tomorrow with the laptop, we will start some mega diagnostics then!!
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froggy
Posted a lot
Posts: 1,099
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How big are your step and % settings in the o2 control .? I'd be looking there if your batch firing the injectors .
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froggy
Posted a lot
Posts: 1,099
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Just looked at mine
32 ign events per step
Controller step size 0.2
Controller authority 2 %
Active above 600rpm and 20kpa so idle is not really messed with
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froggy
Posted a lot
Posts: 1,099
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Fuel settings -ego control and it'll come up . If you put my settings in it won't touch afr at idle so you can just get a reasonable number in the mid 13,s for batch fire . If your trying to go into the 14,s at idle you might have to alter the pulse per cycle for the injectors . I just do 2 simultaneous per cycle and have the afr at 13.6 -13.8 at 725rpm and it's rock steady
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froggy
Posted a lot
Posts: 1,099
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Forgot you need ego control turned off when your auto tuning on the road as well
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Rover V8 EFI Fuel PressureToolsnTrack
@overdrive
Club Retro Rides Member 134
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froggy, very much a beginner on MS, if you have screenshots it would be very useful...
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