I'm having an intermittent running issue and can't work out what the hell the problem is, any suggestions? It feels like a misfire (lumpy running, but doesn't stall) and AFRs read super high on the WB02. I've logged it but can't see anything specifically out of place aside from high Timing Error (Running MS2, DIYPNP).

Tune, Log (see at about 100, 140 and 180 secs), and Snapshot of log attached for info.



Things I have done so far:
- New (aftermarket) Coilpack, Leads and Plugs
- Checked Compression (just because I could)
- New OEM Fuel Filter
- Replaced CAS with used one, no difference.

- Finally, I replaced all of above with Toyota COPS (wasted spark config)...The problem still occurs.

Is the Timing error increase a clue? Am I looking in the wrong place, ie could it something like a knackered Cambelt tensioner, or something in the fuel system? Or my second CAS could be dodgy?

Any suggestions help would be really appreciated, sorry I've repeated this Q a few times, I'm at a bit of a loss!

Dave

 

Any thoughts guys? I've reached the limit of my knowledge and i'm struggling on this tbh!

 

Have you tried adding fuel to those areas of the VE table??

 

Sorry I'm not sure I understand how adjusting the VE map would help. The problem is intermittent (occurs every few journeys), it's not constant or dependent on load / throttle.

 

Bad gas? Water in the fuel?

 

Perhaps the fuel pump?
Double check your base timing as well, couldn't hurt.

 

You've got a lean cell (42) @ 33/800. At 92-101s, 141-142, , 181-184s are all hitting it pretty hard.

 

Also at 71s.. basically, every time you loiter around the cell you go lean.

 

look how your idle speed drops, then the AFRs lean out.

check to see if your TB is still tight.