Intermittant Power Loss

[MarkSmart]

Hi Guys,

I've got a twin map with the second being pops and bangs....however I've noticed that for what ever reason I get reduced performance. It would appear it can be in either map and apparently seems to clear itself.

Something that I notice whilst it's in the limp mode is that when going slow and full throttle....I get very loud noise out of the exhaust, very little forward motion then surge and then power cuts in, despite being at say 70%.

Sitting at say 90 mph on a dual carriageway in 6th the engine sounds louder than normal and acceleration in sixth is progressive but no surge of power. At an unknown point the engine goes quieter, power is resumed and acceleration is back to being what 423 bhp should be.

I've got Evo scan and have done a logging session but don't overly know what I'm looking for however the idle speed goes between 781 to 812 rpm and steps between the two frequently. I've also noticed the low fuel trim is saying 12. something where as the guideline says that it should be under 5%. Previously when I had a fault with the car and the RAC man came out he gave me a PO170 code which was also low fuel trim malfunction....

Ant at Indigo GT, tested the de-cat pipe with an 02 sensor and meter and this read a a perfect 14.7 to 14.8 air to fuel ratio....this problem corrected itself about four days later....and nothing was done to cause this.

Any help with regards to getting my performance back and not keep jumping between the two would be amazing.

Regards

Mark.

[GrayW]

I would think the injectors are not scaled correcy if you are getting out of spec fuel trims. Do you have non-standard injectors fitted?
If you post the logs up Mark, one of use will take a look for you.

[MarkSmart]

I would think the injectors are not scaled correcy if you are getting out of spec fuel trims. Do you have non-standard injectors fitted?
If you post the logs up Mark, one of use will take a look for you.

Hi Grey,

Yeah I have different injectors from standard I have a set of norris 700cc in there.

Wanted to also post up the file but it's 2.3 mb in size so have emailed it to you instead.

Something to bear in mind is that when it's in the limp mode fuel consumption is noticeably higher, but returns to normal and faily sensible once the performance is back. :confused1:

Regards

Mark

[GrayW]

Is the CEL light on?

[MarkSmart]

Is the CEL light on?

Which one is the CEL light buddy?....sorry for being dense!

Regards

Mark

[evonut270]

Which one is the CEL light buddy?....sorry for being dense!

Regards

Markthe yellow light thats the shape of an engine under the speedo needle.:p

[MarkSmart]

the yellow light thats the shape of an engine under the speedo needle.:p

No it's not been on at all since the RAC man came out to read my error codes (pre my cable arriving) the RAC man could only give me a PO170 code at that time which he said was a Low Fuel Trim malfunction....he cleared the error code and the fault has not popped up since.

Regards

Mark

[evonut270]

have you touched any of the intake pipework recently?

[MarkSmart]

have you touched any of the intake pipework recently?

Nope I don't go under the bonnet....I leave all the stuff under there for the professionals and the last time it was serviced it was up at Indigo and everything under their then was fine. :confused1:

Regards

Mark

[evonut270]

Nope I don't go under the bonnet....I leave all the stuff under there for the professionals and the last time it was serviced it was up at Indigo and everything under their then was fine. :confused1:

Regards

Markhave you got any logs we can look at.?if you have send me an email if you like with the logs and your rom.

[MarkSmart]

have you got any logs we can look at.?if you have send me an email if you like with the logs and your rom.

I emailed one over to Gaham earlier but he said that I was missing knock sum and something else from the logs....so I've now activated them in my Evo scan v2.5 all ready to do a nice run in the morning...will be up loading them by lunchtime for all to see.

Regards

Mark

[GrayW]

Mark, can you do logs using both sets of maps also please.

[MarkSmart]

Mark, can you do logs using both sets of maps also please.

Yeah of course no problems...

Regards

Mark

[MarkSmart]

Mark, can you do logs using both sets of maps also please.

Right guys, managed to go out today and did two run, the first is of a from cold, autochoke, on to off before pulling away and a few short blast throught gears, through the revs and some around town, and some spirited driving.

The second was done after about 20 minutes cooling down and then this was done with the 2nd map the "Pops & Bangs" version. Have a look and see what you all think?

Regards

Mark

[MarkSmart]

Right guys, managed to go out today and did two run, the first is of a from cold, autochoke, on to off before pulling away and a few short blast throught gears, through the revs and some around town, and some spirited driving.

The second was done after about 20 minutes cooling down and then this was done with the 2nd map the "Pops & Bangs" version. Have a look and see what you all think?

Regards

Mark

Hi,

Has anyone had a chance to have a quick look at my logs at all? :confused1:

Regards

Mark

[GrayW]

There is nothing to indicate any issue in the logs Mark, apart form a small amount of knock in one location. Did you have the intermittant loss at all when you did they logs?

[MarkSmart]

There is nothing to indicate any issue in the logs Mark, apart form a small amount of knock in one location. Did you have the intermittant loss at all when you did they logs?

The anti-lag log was on full power and the non anti-lag version was on the lower intermittant power...Annoyingly that how it changes! I'm waiting for the power to dip off again so I can do you another Anti-lag log with reduced power so you can have a proper look.

With regards to the small amount of Knock, was it an acceptable level for the car? Is it causing damage by driving it at lost power?

Regards

Mark

[GrayW]

The knock is nothing to worry about. If you can get a good log of a problem run and one without issue, it will be much easier to see if there are any differences.

[MarkSmart]

The knock is nothing to worry about. If you can get a good log of a problem run and one without issue, it will be much easier to see if there are any differences.

Thanks Gray, hopefully when I go out later it will go wrong long enough to get a decent log for you.

Regards

Mark

[MarkSmart]

Thanks Gray, hopefully when I go out later it will go wrong long enough to get a decent log for you.

Regards

Mark

It has become apparent today that I have a failing Battery in the Evo....I've also noticed that whilst on the way to get the battery checked that the intermittant power loss has happened again! I'll be doing a log tomorrow in hopes that the power loss is still as it is now, but I was just wondering whether a failing battery could be a reason for the loss of power that I've be getting....and the only reason it seems to correct itself is that I've travelled a few miles and put enough charge back into it. :confused1:

Regards

Mark

[GrayW]

Battery voltage can effect the injector latency times, knocking the fueling out. Saying that with the engine running the alternator should be keeping the voltage around 11.6v to 14.6v, depending on the state of the battery.

[MarkSmart]

Battery voltage can effect the injector latency times, knocking the fuelling out. Saying that with the engine running the alternator should be keeping the voltage around 11.6v to 14.6v, depending on the state of the battery.

Well, it's not great....I've had bad health for the last two weeks, (Cancers playing up again!) so have used it about six days ago and the RAC man had to jump start it for me yesterday....and the last time I needed to have to Jump started before that was when we were testing the new head-unit that was fitted, about 20 minutes of low volume very little bass music and the car wouldn't start and the central locking was only working on some doors and the windows were slow.

I've found a decent yellow top battery recommended by an MLR buddy and local mate who's got on on his set up and has no issues at all. http://www.lkperformancestyling.co.uk/catalogue/optimabatteries/Type/Yellow%20Top/Description/Optima%20Yellow%20Top%20YT%20S%202.7RJ%20(Japanese %20Terminals)%20(Reversed)%20Performance%20Battery .html

However I'm also aware of a ROSS SPORTS June special on batteries although more money, they are geared more for the race market and would seem that their weight saving is their better selling point over the Yellow Tops. http://www.lancerregister.com/showthread.php?t=265066&highlight=battery

Which of the two would you recommend over the two (don't really have to take the cost into factor) just base on performance and reliability. :smile:

Regards

Mark

[GrayW]

If you can fit an OEM 260 battery still (larger so can have top intake pipe clearance issues sometimes), they are rated as a winter battery. If you look at the battery tray it has the markings for the winter pack item on it.

[Evodoc1]

I have been having this same problem on my E6 ever since I moved the battery to the back of the car and used 4G wire. Maybe I should use 0G. Anyway have you been sorted out?