New symptoms, backfiring excessively at 4000rpm

[Spud_G40]

I agree, sounds like the FSE valve was making it run too rich, going back to a original 3 bar regulator is a good idea, then fit your new bank 1 lambda, I had the exact same symtoms with mine, really makes it misfire around 3.5-4k revs with a dead lambda.

 

[g-max]

Now put new lambda and no effect

 

[wilz]

Coilpacks, sparkplugs?

 

[g-max]

New coilpacks, sparkplugs and again same problem. Maybe ecu broken? There are many topics, but none is not the solution to the problem.

 

[wilz]

missfire

try replacing the coolent temp sensore that sometimes causes that problem you are having

 

[g-max]

several times change it

 

[wilz]

Get it on Vag com mate its the only way of telling what is wrong. You could go round in circles changing everything.

 

[dandanibiza]

Long time since a reply i know, but anyone know what the outcome was, sick of spending money on mine now, same symptoms as well. So far I've changed;

New maf
new plugs
New coil packs
new fuel pump
Forge diverter valve
tried new n75 valve to no avail

Had utter checked on vagcom and the only issues i had was low vaccum in manifold. Ny injectors are slightly weeping (all 4) so could that cause this issue?

Thanks for any reply in advance.

 

[Luke_]

i had similar problems would boost then suddenly have like a cough then no boost.

vag comd at AmD and founf the same fault code of charge max pressure exceeded.

the wastegate was seizing causing it to overboost which made it run lean and sent itself into limp mode restricting the boost to avoid damage.

got a new turbo sorted just gotta whip it on to see if it sorts it

 

[Berg]

Could be MAP sensor

 

[Tucker157]

Could be MAP sensor

I've seen dodgy ones read 3bar of boost at idle! Of course causing limp mode lol Worth the check... Cheaper than a turbo...

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