P1470 Turbo boost solinoid problem fixed
- Thread starter Gogadget
- Start date
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kept an eye on turbo boost ( in m.a.p. values ) today .. 30 mile country A roads drive
( via a 'scangaugeII' )
all values are aproximate .. except 'at idle' ..
m.a.p. values in p.s.i.
14.7 at idle .. ( shows less when above sea-level .. 14.1 in my street )
15 / 16 along flat .. 30 / 40 mph
16 / 19 along flat at 50 / 60 mph
26 at a medium overtake in 4th gear
26 at medium acceleration uphill 1 mile in 5th gear .. 50 to 65 mph
28 / 30 foot to floor uphill .. 1 mile .. 3k rpm ..
( may have seen 32 on one previous occasion in similar circumstances at 3k+ rpm )
i think 32 is about the max. before the ecu will cut power to prevent damage ..
( or adjust the turbo vanes to reduce boost )
that's just a possibility from reading articles ..
no idea what the actual value is as set by land-rover or bmw ..
but .. there is a max boost level allowable by the ecu before it reduces boost or limits / cuts the power
if the turbo vanes are stuck in a 'high boost angle'..
then i'd assume that the max. value might occur at lower throttle-position / rpm / acceleration scenarios ( or something like that : -)
for turbo ' boost ' levels .. detract 14.7 psi from above values ..
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4x4Dog
Active Member
- Posts
- 122
- Location
- North Wales
The P1470 code is pretty generic and can be anything from a leaking vacuum line to a knackered turbo. I had one back in November and it was a cheap fix. The vent solenoid filter had got water in it.
NoDosh
Active Member
- Posts
- 311
- Location
- Hobbit central - Dorset
the vacuum chamber and the one-way valve need to be checked before you go any further. Stick a vacuum pump on it pre and post the one-way valve and see if it will hold -1bar.
Hi nodosh
Vac test
First pic test vac 800 mbar pipe disconnected from turbo boost solenoid and clamped. Pipe taken off fromvac-chamber feed and connected to test gear . Pressure lose is 1 mbar per second.
Second test every thing connected and again tested fromvac chamber pressure lose 10 mbar per second.
Same test done this time with vent filter clamped off. Pressure lose 1 mbar per second.
Third test tee,d off fromvac chamber vent filter clamped pressure lose 3 mbar per second.
Fourth test. Same as third but with vent filter unclamped . Pressure lose 12 mbar per second.
Compared old boost solenoid with all poets clamped. Pressure lose 7 mbar per second.
Sorry all in mbar as meter doesn't do bar. Seem to be loosing pressure via the vent filter. Boost solinoid is lr original only 5 months old.. Seems comparable to the old one on loss . Does the solinoid vent when energised or de energised . As both seem to have some vent leakage when no power applied. Any ideas ?
Vac test
First pic test vac 800 mbar pipe disconnected from turbo boost solenoid and clamped. Pipe taken off fromvac-chamber feed and connected to test gear . Pressure lose is 1 mbar per second.
Second test every thing connected and again tested fromvac chamber pressure lose 10 mbar per second.
Same test done this time with vent filter clamped off. Pressure lose 1 mbar per second.
Third test tee,d off fromvac chamber vent filter clamped pressure lose 3 mbar per second.
Fourth test. Same as third but with vent filter unclamped . Pressure lose 12 mbar per second.
Compared old boost solenoid with all poets clamped. Pressure lose 7 mbar per second.
Sorry all in mbar as meter doesn't do bar. Seem to be loosing pressure via the vent filter. Boost solinoid is lr original only 5 months old.. Seems comparable to the old one on loss . Does the solinoid vent when energised or de energised . As both seem to have some vent leakage when no power applied. Any ideas ?
Last edited:
Took some readings by tee,ing off before vac chamber.
Tickover -14.24 psi
2000 rpm -14.31 psi
3000 rpm 14.28 psi
Took some readings
First reading at tick over second at 2000 rpm static
Not sure what unit of measurement the low pressure supply is , have emailed icarsoft and am waiting for a reply.
Fuel pump first thing this morning took 31 seconds to prime and stop , tonight after standing for 8 hours to 58 sec to prime. Pump has a gentle wirr but every so often it sounds as the impeller is unbalanced. Is it worth changing pump with filter, still scratching my head map pressure seems ok.
Tickover -14.24 psi
2000 rpm -14.31 psi
3000 rpm 14.28 psi
Took some readings
First reading at tick over second at 2000 rpm static
Not sure what unit of measurement the low pressure supply is , have emailed icarsoft and am waiting for a reply.
Fuel pump first thing this morning took 31 seconds to prime and stop , tonight after standing for 8 hours to 58 sec to prime. Pump has a gentle wirr but every so often it sounds as the impeller is unbalanced. Is it worth changing pump with filter, still scratching my head map pressure seems ok.
Attachments
Have ordered new filter and fuel pump will see if that makes any difference
Have done some tests on another boost solinoid and that seems same as mine so another off the list
Does anyone know what pressure the hp pump should be at at tick over as checked my mates and it different to mine. Also his is td4 auto and mines td4 manual both 04
First pick mine at tick over
Second mine at 2000 rpm
Third mates at tick over
Fourth mates at 2000 rpm
Hp pressure and map seems a lot different ( mates is auto so not sure if it makes difference)
Any ideas or am I p@@@ing in the wrong direction
Cheers
Have done some tests on another boost solinoid and that seems same as mine so another off the list
Does anyone know what pressure the hp pump should be at at tick over as checked my mates and it different to mine. Also his is td4 auto and mines td4 manual both 04
First pick mine at tick over
Second mine at 2000 rpm
Third mates at tick over
Fourth mates at 2000 rpm
Hp pressure and map seems a lot different ( mates is auto so not sure if it makes difference)
Any ideas or am I p@@@ing in the wrong direction
Cheers
Attachments
Have checked vac readings against a mates freelander the same as mine and they seem to be the same. Also th boost solinoid giving the same readings. Changing the fuel pump and filter today , will have to wait for the next Wales run in a couple of weeks to see if it has made any difference. Next I think is turbo. Have been reading about the spray cleaner you can put in situ just by removing exhaust. Has anyone used these kits?
Your 2000Rpm fuel rail pressure looks low to me. Mine is about 65,000Kpa at 2000Rpm. You're showing half that value. You could have a suspect pressure sensor, or faulty wiring to it.
That's more like it. If the filter is blocked, it will make a difference but you low pressure pump figure looked ok which contradicts the results seen. Very odd. How is it running?
Running fine. Got a little more poke. Could it be that I have the pressure in the pump but not the flow out of the filter ( I work a lot with high pressure gases and the same is true) maybe the hp pump coped with the reduced flow on the flat in Norfolk without a heaven load . Could not find any data for the min and max pressure of the hp pump. Just need to try it under load going up hills with caravan on to see if it has cured the p1470. All faults cleared in ecu. Will check hp rail plug and wiring by the weekend just as a precaution and monitor the pump pressures just to make sure it stays at that level . Cheers nodge
Well that didn't work. On way to sunny Wales with the caravan and kayaks in tow and p1470 keeps cropping up again Seem to. Be after you have slowed down and then accelerate to get to 60. It. Clears if you drop down a gear or two to get it over 3000 rpm. Had i930 on and when power is lost the map goes down ( expected). A shot in the dark I put the egr back on. I proved the grunt but still limp mode. Any ideas. Only seems to do this when cAravan is in tow
Skinny Mike
Well-Known Member
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- 2,910
Bit strange now this one. Two things to check, turbo vanes covered in crud?
Is the vacuum pipe from the EGR solenoid to the EGR leaking, is the EGR solenoid clogged.
Other than that, I stumped.
Mike
Is the vacuum pipe from the EGR solenoid to the EGR leaking, is the EGR solenoid clogged.
Other than that, I stumped.
Mike
Skinny Mike
Well-Known Member
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- 2,910
Fair enough, double check the MAP sensor.
And put the Freelander on the kayaks and paddle back
Mike
And put the Freelander on the kayaks and paddle back
Mike
