Hi to all,

First, I am sorry for my bad english.

I have a problem in my V4 Type R with EJ257 block, under full load (WOT) the car is too rich and have misfires/cuts, AFR is too rich after 3200-3400 rpm, plugs changed, maf changer, ISCV cleaned, boost is not high, max 0.9bar, have a log with the AFR (Innovate LM1).

3000 RPM


3425 RPM


3925 RPM



What can cause enrichment?, boost leak?, bad FPR?, bad map read?

 

what ecu is in mapped on?

Simon

 

Stock STI V4 Ecu

 

possiblhy det then.. the 2.5 will not like the timing advance in the sti v4 map at all.

unless you used very thick head gaskets to lower the compression.

It needs a mappable ecu and a map for the engine change.

Simon

 

The engine is running from two years ago, they works ok (thick head gaskets and modified combustion chamber) but the last june broke a ringland in one piston, after replace the piston the car don't work ok, compression test is ok.

 

rich would be intercooler, or vacuum pipe leak or dump valve etc

 

Solved, the problem is one ignition lead.