After a spirited drive home from a card game last night, £50 up, I got the CEL when decelerating. This came on for all of 20 seconds and then went off.

There had been no knock at all at full boost, 1.25bar, and everything else seemed to be fine.

So what does the PFC throw a CEL for?

Cheers,

Wayne.

 

what sort of cell was it?quick flash,slow flash,continue light?every cel code has a different rate flash

 

It was a continuous cel for 20 seconds. The main reason I ask is that I thought the CEL function wasnt the same with a PFC as it is with a standard ECU.

 

Have you got the commander as well? The pfc could have thrown a cell for the injectors if they have reached max duty. (i know you were deaccelerating so this is unlikely) I think it also may throw it for some of the sensor but Im not sure on that. Sure one of the fc mappers will be able to answer some time soon.

 

If whilst the CEL is on you go to "ETC --> sw/sensor check" the sensor at fault should be illuminated. If it is intermittent then that may be of little help.

It does come on for other reasons, like injectors maxxed out like Jay says but only whilst they are maxxed out so decellerating.. even if it is set up to pop and back on over run by injecting fuel and retarding the ignition.

 

Simon,

Tell me more about the popping and banging!!! lol

How do I achieve that?

I have the commander mounted in the dash so will be about to monitor next time.

 

set rows 1 and 2 from 3000rpm upwards to 0 in the timing map will have the desired effect of the pops and bangs.

 

Depends what settings in the ETC. menu are set to flash the CEL .. there are 5 items IIRC, air flow sensor, Knock and some others ...

I have only Knock ( and I think air flow sensor ) set ON in my PFC, and I only see / saw CEL when I was on too high boost / poor fuel.
I think maxing injectors is another trigger too..

Who mapped it / set it up? They should know, or else you can look your self in the menu screen!

 

nice dash mounting how did you take apart commander at was it a hard job i had wondered about doing mine as it is in a ipod holder on my airvent at present

 

There is the injector warning, knock warning, and airflow warning.. the other two of the five are boost control kit (used to tell the PFC the boost control method) and O2 Feedback which turns the lambda sensor on and off.
Only the knock is a flash the other two are solid on of the CEL..
on top of that there is all the sensors within the "SW/Sensor Check" within ETC that also illuminate the CEL, plus over boost and map sensor maxxed out..
ie. there are many reasons.

As Jay said set ignition row 1 to 0 from 3000rpm upwards and increase the fuel in the same row if needed.. or you can make it inject fuel on a closed throttle..

Simon

 

Its pain in the **** mate. Even if you get the 2 boards apart, without totally destroying everything, you will still have to repair broken tracks on each board.

Put it this way, I wont ever do it again.

Cheers for the replies for the CEL. I think it may be either overboost or IDC that is causing it. IDC sometimes reaches 90% so it may be time for some larger injectors, 550cc ish.

Can this be done without remapping? I'm thinking that I just scale the injectors to 80% for 550cc from 440cc?

 

Unfortunatly not.. you can get it close but the different injectors will have a different spray pattern and you need a wideband to get it close.
If you fit larger injectors then you also would want to take advantage of them..

The only time i had seen similar CEL activity was throttle position sensor.. but that is not to say that this is the problem on your car

Simon

 

Spent the last couple of days monitoring the injector duty cycle and I have found that they do seem to get maxed out.

I get 100% at times but this is peak and not held. I need to do another couple of days with the map tracer if I can to see whats happening.

Normally though 90% peak has been the max.

This is at 1.25bar which is what AndyF mapped it at.

I have done a couple of things since the mapping but I'm not sure if these would cause this.

The hose from the turbo to the IC had a stainless steel section, as it wasnt long enough, has now been removed and replaced by a 1 piece hose.

The steel tube was 46mm ID and the new hose is 51mm ID

Also, I have smoothed the entry to the alloy pipes that feed the IC. They are now knife edged and are ported quite well to be honest.

But, thats all thats been done, so I'm not sure. Unless mapping in hot weather makes it run closer to the edge of the IDC when the air temps decrease.

Any thoughts?

 

With the colder weather you will see an increase in IDC, that is what i noticed with my PFC and this was mapped JGM (Simon).

banny

 

Found it!!

Its taken a while to raise its ugly head again, but today I have had the commander set to monitor the sensors and it has flashed a CEL with the TPS being highlighted at the same time, as per Simon's post.

The TPS reading is 0.53v at idle and goes to a max of 4.37v. Is this voltage right? I thought it should be bang on 5v at WOT.

 

The TPS is a strange one, my car does the exact same thing for a few days then for months its fine. Then for no reason it will start again and stop when it wants to.

banny

 

Just tweek the tps sensor to increase the closed voltage very slightly, (0.1v is enough) over time, wear can cause the throttle to shut slightly further, especially during high vacuum on overrun.

Andy

 

Will have a go, cheers Andy/Banny!