I have a strange problem with my car that I have not been able to deal with since I bought it. It used to be very rare, but now its frequency has increased so much that I cannot use the car normally. It looks like this:

1. I'm driving and suddenly my fuel supply is cut off (AFR shows a maximum value of 22.4+). I can press the gas pedal all the way but there is no power.
2. Only when I change gear (eg from 3 to 2) I have fuel supply back for some time, but usually AFR shows then about 9.0 when I stop on the lights (too much fuel). After such a gear change, I sometimes get shot from the muffler.
3. Then the same as in point 1 is repeated again.

I made a video to better illustrate the problem. Originally the movie is in Polish but I added subtitles so you should understand everything


P.S. Since the car is modified it has larger fuel pump and 800cc injectors. First owner was running it on ethanol (that I cannot get in my country...) so I remapped it to petrol and switched to smaller injectors (from 2000 cc).

 

Is it a single in tank fuel pump or double pumper?

Is the fuel pump hard wired?

Is the car set up on SD or is it running on the factory MAF sensor?

Did this issue occur with the 2000cc injectors, or did it start when you changed them out for the 800cc injectors?

I’m assuming the 2000cc Injectors were high z meaning previous owner needed to to a resistor pack bypass, your 800 are likely low z and need the factory resistor pack functioning to work correctly.

Please post Current Injector Scaling, Injector Latency, and Fuel Maps. Posting a data log may help as well

Ia the car still on the factory FPR or the FPR an aftermarket unit? If so what is yore current idle Fuel Pressure?

Basically it could be any number or a combination of things

 

Hi. Sorry for such a late reply

Single

I'm pretty sure it is

SD

Both 800cc / 2000cc. I've downgraded injectors also because I thought it will fix this issue.

No, I specially bought 'high' ones too.

I'll try to get it from my Link ECU.

This one I dont know. I'll try to find out.


Besides that I checked if the fuel pump works correctly by connecting a gauge straight to the fuel pump. Everything was ok. Also the fuel tank wasn't stuck or dirty in any way.
I thought it happened maybe because I was running it on low RPM's and the engine was flooding. But even if I drive it in total race mode it still randomly occurs. Recently I noticed that 99% of cases this problem starts to occur after the car was shut down (turbo timer works for 20 sec) and then (for example) started after 5 min. It doesn't occur every time but mostly it looks like that:

1. I turn the key 'ON'
2. I can feel a little struggle in the engine to start up (like 1-2 sec of delay)
3. My gauge shows 8-9 AFR.
4. I start to drive and right away it 'cuts' me off.
5. I stop. I turn key 'OFF' and then 'ON' again to 'restart'
6. My gauge shows 14-16 AFR.
7. Now everything is ok, I drive normally

Sometimes after this 'reset' I still have 8-9 AFR and I must do it again..

Thanks for help

 

Update

My last guess is faulty crankshaft position sensor. My LinkECU doesn't catch any error (thats another mystery to me...) but I'll change it anyways.

 

Update

Crankshaft sensor replaced but I dont think that was the case cause car entered this crazy mode again.

Update 2

I found out that my oil catch can is overfilled (to be honest I didnt check it for couple of months..). I cleaned it and made DIY emptying kit. That was 4 days ago and car is still driving just good.

 

Update 4

After a week of good work, the fault returned

Oddly enough, the AFR sensor (gauge) has stopped work. I pulled it out and there was much soot on it. After cleaning it and calibration still gives me error E8 (for Innovate its 'bad sensor') so I think it is destroyed.

After cleaning oxygen sensor and adapter my fault still occurs.

 

Update 5

I'm not sure if anyone reads it but I'll keep on updating since nobody who I know experienced such an odd problem

So my last guess was that it could be faulty camshaft sensor. I replaced it but the problem still occurs. I also replaced O2 sensor connected to my gauge and now I have (I hope) good readings. Car starts on 10 AFR and then when engine gets hot it moves to about 13-14 AFR. At my last ride while problem occured I have noticed something strange. First of all it just happened when I was driving rather fast, without any cause really. Just slight lose of power, but I knew what would come after it. While pressing accelerator pedal it cuts power as always but now I've heard some 'little' explosions in my exhaust . Like burning fuel or something. So it went something like that:

1. I press the gas pedal
2. Car accelerates
3. Randomly on higher RPM I got complete cut-off of power, which results in a strong slowing down of the car (AFR shows max value)
4. Turbo gets 'quiet' and I can hear explosions in my exhaust
5. I change gear and apply some throttle
6. I can hear my turbo coming back to life, car seems to drive ok for like 5-15 sec. but then the problem returns.

My ECU Link shows no errors ...

Any guesses?

 

It looks and sounds like a fuel cut. This could be a safety measure that the tuner added to the Link ECU, or a bad electrical connection to the fuel pump or injectors which happens randomly. An ECU safety measure could be triggered by boost (MAP), RPM, IAT, or coolant temperature limits, or any combination of these.

If you want someone to help you to diagnose it, download and post a log from your ECU.

 

Ok I managed to log everything (I hope) from the time the error occurred. Today it happened when I turned the car on after approx 10 min of break (I went to drop something to friends house). Oddly enough I spent many hours for two last days to force this error to come, simulating many cases. One of them was shutting the car and starting it after some time (just like it happened today..) but I couldn't make it come. Today it happened like that:

1. I turned logging and started the engine
2. After two minutes waiting at the traffic lights I started to drive
3. Error occurred just after leaving the traffic lights, I got total power cut (if there is a time logged it happened approx at 11:21-11:23 my local time)
4. I managed to get to bus stop, changing gears and getting this power cut every time
5. I waited there for some time, to be sure that I get all the data logged. Engine was still running
6. I started to drive normally and then the car was moving rather normal, without this power cut. After that I turned it off, and saved log file.

My base map and log file from my LinkECU available at the link:
https://drive.google.com/drive/folde...4-?usp=sharing

map.pclr - my base map
problemx.llg - log from the time this error occurred

Many thanks!

 

Unfortunately your log file is in an encoded format that I cannot read. I guess it can only be read by the LinkECU software which I do not have.
LinkECU is not common in the US so there are very few people on this forum with the knowledge you will need. It may be better to post your LinkECU question in the UK based MLR at https://www.lancerregister.com/ as the LinkECU is more widely used in this community.

 

Ok, I understand. By the way the files were encrypted with password but now I've removed it and re-upload with the previous link:

https://drive.google.com/drive/folde...4-?usp=sharing

If somebody would like to try to help me anyway here is a link to software. Its pretty straight forward - you click Logging -> Add log file

https://www.linkecu.com/pclink/PCLin...32%20Setup.exe

 

Still can't open it!

 

Does it cut at same load/boost every time? If so, what is your load or boost limit in the map, and how much load or boost are you getting to when it cuts?

 

Varv - You are hitting 100% fuel cut due to what looks like a very low battery voltage of 9.6V. Find out why your battery voltage is so low.


Details: The Engine Protection setting in the GP RPM Limit 2 table is set to apply a fuel cut if the battery voltage is below 13V and RPM is greater than 500. Your logged battery voltage starts out at 12.02 V, and drops to 9.6 V, so fuel cut will happen once engine speed exceeds 1000 RPM. The fuel cut happened 4 times as you tried to accelerate with a low battery voltage. Then it increased to 13.74 V and everything was OK.

Correction Required: Charge your battery up, or remove the engine protection setting for low battery voltage by increasing the RPM limit in the GP RPM Limit 2 table to 10000.

 

Thank you so much

Now it all makes sense. I'm getting some strange noise from alternator when starting the car, so maybe it is failing. Anyway, I will check the electrical installation to be 100% sure. Thanks again!