what's wrong with my car???

[JIMYU]

I've been getting limp mode recently and have got these fault codes. Does anyone know what could be wrong??

Maximum Charge Pressure surpassed
Coolant temp sender - implausible signal
Bank1, Mixture adaption (mult.) - System too lean
Voltage supply - voltage too low


Hmmm....any ideas?

I'm thinking lambda maybe? or n75?

 

[Martyn]

Faulty / Non Standard N75 can cause the overboost fault.

Coolant temp sensor is either unplugged or screwed.

System too lean can be caused by a failing / dead MAF.

Supply too low is just the battery being disconnected.

 

[LeeroyBrown]

iv got a coolant temp sensor aswell but car is fine had the fault for ages.. Will get round to sorting it one day

 

[JIMYU]

thanks guys.

but wouldn't the temp sender cause the engine to run rich, not lean??

and an air leak would make it run rich too yeah?

think i'll put my standard N75 on and see if that helps

 

[Molehill_Mike]

think i'll put my standard N75 on and see if that helps

What N75 do you have mate?

If you have REVO, so you know it was written with the N75 'F' valve in mind....

Dunno if thats any use to you...

Mike

 

[Martyn]

What N75 do you have mate?

If you have REVO, so you know it was written with the N75 'F' valve in mind....

Dunno if thats any use to you...

Mike

Incorrect mate, it was written for the 'C' which IS standard on the Mk3 Ibiza.

 

[Martyn]

thanks guys.

but wouldn't the temp sender cause the engine to run rich, not lean??

and an air leak would make it run rich too yeah?

think i'll put my standard N75 on and see if that helps

The temp sender can do strange things to the running of the car but I doubt it would effect the fueling.

The Air leak would be mean you'd be running lean as the amount of air entering the engine will be greater than measured by the MAF.

 

[Molehill_Mike]

Incorrect mate, it was written for the 'C' which IS standard on the Mk3 Ibiza.

Not according to REVO? Not in my recent observations either?

Mike

 

[Martyn]

Sorry, I should of said 'was'. The part number appears to have been superseded in ETKA.

 

[Molehill_Mike]

Cool no worries...

Mike

 

[JIMYU]

I've had a N75J on for about 2 years now. I have a custom map from Imp. Per. which was written with the n75j.

 

[Molehill_Mike]

Hmm.. I dunno then mate, sorry can't help... other than checking all piping but that kinda goes without saying...

Mike

 

[JIMYU]

Yeah all the piping is fine so i'm just confused.

I changed to n75c whilst i was reseting the ecu and when i started the engine it coughed and spluttered for about 30 seconds then was fine. i drove for about 45 mins and i havn't got limp mode yet but the car seems quite a bit slower now and i've lost 4-5 psi boost. but i suppose my remap is to a j valve.

just gotta wait and see if i go limp again now!