Thread: Td5 low power - fuel pump vs MAF

If the MAP is duff can I unplug it an expect any improvement?

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Originally Posted by Disco Muppet

If the MAP is duff can I unplug it an expect any improvement?

sometimes but not always.

As above, the default mode for MAP failure will set the engine to a reduced performance... now if the MAP is still sending signals and based on it's readings the performance is even worst than on default you can feel an improvement... it depends very much on the fuel map variant too but if you feel no difference with it unplugged it means it's gone

though for both sensors if the failure is open circuit unplugging it makes no difference

the best for you would be a nanocom session to record the fueling inputs on SD card, edit them with excell and post them here ... you can try that trick with multimeter set on 20A instead of the pump fuse cos it's easy and if you get low amps then you know 100% the pump is gone, at least that's certain... a normal(around 15A) reading doesnt mean that it's 100% good though

also as your EGR is removed did you unplug the electrioc connector on the modulator or let it as it was?...it's a good practice to unplug it cos it's on the same fuse with the MAF and wastegate modulator and puts unnecessary load on that circuit, BTW check fuse F2 in engine bay just to be ruled out.

When I say the EGR is totally gone I mean totally gone unplugged, fully removed, not a trace
I can't easily get the recorded data, I'll try unplugging the MAP and see what happens, from memory it was slightly worse when I unplugged it but I'll try it.

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You can also try with AAP sensor(the one in the airbox) unplugged to see what happens... when you plug in nanocom first erase all the fault codes cos there will be some logged due to these tests then after the drive with the live data record read codes again to make sure there isn't any current

MAP unplugged is worse.

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AAP sensor doesn't really have much change, at first it seemed to remove the feeling of being held back by a rubber band although its hard to tell around a driveway.
I'm forced to live with it for now, what I'll do is either order a nanocom before any parts, or arrange to get the local Indy to check it out and I'll arrange parts based on that.

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Okay, fuel pump replaced today....
Still doing it
I'm really getting totally over this crap....