My mk1 Octy vrs started with a running issue today. Car is stage 1 initially was a severe loss of power, sort of misfire but felt fuely rather than sparky.  Was holding back then taking off etc.

 

 

Tried a run with MAF unplugged, no difference in fact worse.  Tried a spare set of plugs, now this improved the running but the issue is still there and at times just feels generally down on power.  No codes thrown at this point.

 

However, EPC light then came on and ALL power went.  Turned off and on again power returned albeit with the same running issue.  This did give me a code though:

17743 engine torque monitor 2 control limit exceeded

P1335 35-10 intermittent

 

I also had 01314 ABS fault but I think that was from unplugging MAF as TCL came on.

 

I then measured blocks 002 and the intake air mass gave me 170 g/s at 5880 rpm, which extrapolates to around 210bhp about right, so can rule out MAF?

 

I then measured 032 for fuel trim (unfortunately I'd cleared the code, didn't realise it would help if I didn't) so ADD mixture unsurprisingly stayed at 0%, Eventually got a reading from Multi mixture of -1.6%.  Is that normal or does that mean it is too rich?  Would explain the feeling like injection is being held back. 

 

Looked at possible causes on ross tech:

Even though unplugging MAF made no difference I have a spare I can try although I'm not sure that one is too good.

My CTS is genuine and went in a few months ago so that would surprise me, I do have the spare non-gen one I took out I could try, which was working when on car.

Air filter is pipercross panel so should be ok.

According to ross tech that basically leaves possible causes of leak in intake after MAF and intake air temp sensor to explore.

 

Any other suggestions?  How is that multi mixture reading?

 

 

Any help much appreciated

 

 

 

Oh, and fuel filter is new and genuine. Could it be the fuel pump?

Multi mix has since been logged at -3.9 and Add at 0.6

Can anyone help with this please?