So, as mentioned elsewhere i reckon i have a sticking EGR.

ive been having a flashing glow plug issue after a very specific set of conditions and then the EML comes on, but not every time.

those conditions are - 

engine fully warmed up so the egr comes online. 

drive at a consistent speed for a few mins with very little throttle change, typically speed over 50mph.

then lift off completely, and let it coast in gear for a few seconds (slowing down handy when coming up on traffic as an example)

then accelerate again.... ping, flashy light.

 

fault scanning gives a yellow mass airflow sensor error code "pending" if just the glow plug light, or a red error if the eml is on too.

so, some live carista data shows the following while cruising at 130kph on the motorway, 5th gear, 2500rpm - 

 

my question is, given the speed, does the air volume look right? to rule out the maf (no other symptoms of a dodgy maf, so i dont think its that)

And... given the negative error percentage compared to the commanded, is that pretty obvious that the egr is stuck? and if so, am right in assuming its sticking open? as the error kicks in after lifting off the power, when one would assume the valve would be closing. but that said, i reckon it runs more efficiently when the light is flashing which would say to me its stuck closed as its getting a cleaner burn with out the recirc'ed gases

 

1.6cr cayc engine. 

 

 

Not sure about the percentages, the ECU will expect to see the mass air flow fall when EGR is commanded.

 

If you dont want to replace the EGR I would say your vehicle is an ideal candidate for an Emulator/Simulator at around £99 from Poland (I think).

 

I think you may have mentioned that your roadworthiness tests are more rigorous, there is probably something saying that no modifications can be made to the emissions control system, if you spend a little bit of time routing the cables on the unit it can be undetectable without removing engine covers, airboxes etc, the visible MAF sensor connector and the cable leading away from it are identical to the OEM, ditto for the throttle valve and the EGR actuator although that is hidden anyway and the unit can be placed right beside it.

If it is stuck shut or will return to the closed position from the return spring pressure then thats ideal for an Emulator/Simulator as you will not need to fit any blanking plates which are supplied.

i think its sticking open, as the fault code comes up after lifting off completely and coasting for a few seconds, when the throttle goes to 0, i would expect the egr to close. and thats when the coil light starts flashing. 

if someone could give more info on what the egr error percentage relates to it would help narrow it down. 

 

 

in other news, i took out the 3 month carista sub, the 7 day trial seems to be gone, and so i ive played with the extra settings, and so as i am a child, i now have the needle sweep on start up activated

 

but i also found the headlights voltage was up to the max. im wondering if this is why i seemed to be blowing bulbs quite quickly, so ive turned that down 12.5v, see if the life expectancy increases!

 

 

 

Edited 3 October, 20232 yr by mac11irl

Fraid I can't help with EGR knowledge,  but with the headlight voltage, I'd expect lifespan to be inversely proportional to the square of voltage. 

See how you get on with reduced brightness though.