I Think I Screwed Up My ECU - Please Help
#1
MBWorld Fanatic!
Thread Starter
Join Date: Sep 2004
Posts: 1,299
Likes: 0
Received 0 Likes
on
0 Posts
I Think I Screwed Up My ECU - Please Help
Please bare with me here. Im desperate and my baby is hurtin':
1. Bought an ASP 177.6mm (178mm) pulley about 3 years ago and had been running it WITHOUT any sort of ECU tune until a month ago. It was running like a complete monster and never once did I have any problems.
2. About a month ago, a friend with factory MB software (ex tech) told me he would adjust my A/F ratio and minimum octane rating (to 87) to get more power out of the car. Said it looked like my engine temps were a little high b/c of the pulley's extra air
3. He set the A/F to a 20% increase in fuel, and I did a road rally that weekend. The car guzzled a tank seeing as it was running PIG RICH and I only got power between 3-5k RPM. It was also slower than an E500
4. After the rally I realize that the car reeks of fuel and I end up having to replace the fuel lines and a leaking fuel level sensor and gasket (b/c of the increase in fuel? )
5. We go back and reset the A/F to 0%, then make it a 10% increase (have to first reset to 0% to reset any auto-adaptations the ECU might have made). CEL had been on earlier (b/c of the constantly changing 02 values) and then I get a code saying one of my 02 sensors had shorted out. I drive to Vegas, and again the car reeeeks of fuel (smell coming from the exhaust, not the engine bay where the fuel lines were replaced).
6. Drove back from Vegas and everything was fine except power is still way down (esp. in the mid-RPM range). Now, somehow the CEL is gone (the one that was for the shorted 02 sensor) and there is no smell of gas.
Still though, the car is slower than it was before this whole mess. I am very fearful of running a car that is too lean, but I had been driving it like I stole it for 3 years with this ASP pulley and there has NEVER been a problem! Should I just reset all of my values to stock and pretend this never happened? Should I pony up and get a Renntech or LET, etc. tune? I just want my old power back...
Any tips/hints/thoughts/suggestions?
1. Bought an ASP 177.6mm (178mm) pulley about 3 years ago and had been running it WITHOUT any sort of ECU tune until a month ago. It was running like a complete monster and never once did I have any problems.
2. About a month ago, a friend with factory MB software (ex tech) told me he would adjust my A/F ratio and minimum octane rating (to 87) to get more power out of the car. Said it looked like my engine temps were a little high b/c of the pulley's extra air
3. He set the A/F to a 20% increase in fuel, and I did a road rally that weekend. The car guzzled a tank seeing as it was running PIG RICH and I only got power between 3-5k RPM. It was also slower than an E500
4. After the rally I realize that the car reeks of fuel and I end up having to replace the fuel lines and a leaking fuel level sensor and gasket (b/c of the increase in fuel? )
5. We go back and reset the A/F to 0%, then make it a 10% increase (have to first reset to 0% to reset any auto-adaptations the ECU might have made). CEL had been on earlier (b/c of the constantly changing 02 values) and then I get a code saying one of my 02 sensors had shorted out. I drive to Vegas, and again the car reeeeks of fuel (smell coming from the exhaust, not the engine bay where the fuel lines were replaced).
6. Drove back from Vegas and everything was fine except power is still way down (esp. in the mid-RPM range). Now, somehow the CEL is gone (the one that was for the shorted 02 sensor) and there is no smell of gas.
Still though, the car is slower than it was before this whole mess. I am very fearful of running a car that is too lean, but I had been driving it like I stole it for 3 years with this ASP pulley and there has NEVER been a problem! Should I just reset all of my values to stock and pretend this never happened? Should I pony up and get a Renntech or LET, etc. tune? I just want my old power back...
Any tips/hints/thoughts/suggestions?
Last edited by zdkdeeier493; 07-21-2009 at 07:27 PM.
#2
MBWorld Fanatic!
iirc, setting octane to 87 tells your car that's what you're running and it will retard timing to allow you to run 87 without detonation. set it back to the factory setting so your ecu will give your timing back.
#3
Senior Member
Join Date: Feb 2008
Location: el clinico magnifico
Posts: 450
Likes: 0
Received 0 Likes
on
0 Posts
E63, S550
I agree, put it back to the way it was before. If you want the most out of your pulley I would suggest you get a tune from a reputable shop that has a dyno so you can verify the changes help, not hinder, your car.
#4
Banned
Join Date: Mar 2006
Location: Southern California
Posts: 2,855
Likes: 0
Received 2 Likes
on
2 Posts
S600TT, R350
Does not make any sense.
Unless he has a DEVELOPER version of STAR , he has no ability to affect A/F ratio this dramatically.
Have him go back to where you were and start from there.
If he can not do it, have dealer flash it back to the latest stock setting.
Good Luck!
Unless he has a DEVELOPER version of STAR , he has no ability to affect A/F ratio this dramatically.
Have him go back to where you were and start from there.
If he can not do it, have dealer flash it back to the latest stock setting.
Good Luck!
#6
Super Member
Join Date: Jul 2008
Location: Brooklyn, NY/Tampa, FL
Posts: 831
Likes: 0
Received 0 Likes
on
0 Posts
2005 BLK/BLK E-Double Nickel.
MAybe i'm slow or someone can explain,
why would he think that setting the minimum octane rating (to 87) would get you more power out of the car??
thanks
why would he think that setting the minimum octane rating (to 87) would get you more power out of the car??
thanks
#7
MBWorld Fanatic!
Sounds weird.. most mb techs do not do performance tuning I would stick to the professionals in this area before he does major damage to your car.
Trending Topics
#8
MBWorld Fanatic!
Join Date: Sep 2004
Location: Ventura County USA
Posts: 1,958
Likes: 0
Received 0 Likes
on
0 Posts
'06 E55, '05 SLK55, a few others
I would not run the car 1 minute longer in its present state of tune. More than one 55K motor has been lost to over rich conditions! What you're describing would have to be so rich, I would not be at all surprised if it has already suffered cylinder wall/piston damage. Keep that idiot away from your car and do a leak down test on every cylinder ASAP.
#11
MBWorld Fanatic!
Thread Starter
Join Date: Sep 2004
Posts: 1,299
Likes: 0
Received 0 Likes
on
0 Posts
Does not make any sense.
Unless he has a DEVELOPER version of STAR , he has no ability to affect A/F ratio this dramatically.
Have him go back to where you were and start from there.
If he can not do it, have dealer flash it back to the latest stock setting.
Good Luck!
Unless he has a DEVELOPER version of STAR , he has no ability to affect A/F ratio this dramatically.
Have him go back to where you were and start from there.
If he can not do it, have dealer flash it back to the latest stock setting.
Good Luck!
We changed everything back to stock values today. Probably going to replace the faulty O2 tomorrow and then do the reset one more time to make sure everything is all good. Haven't punched it yet to see how it drives, but from what I can feel, the jumpiness is back
#13
MBWorld Fanatic!
Join Date: May 2009
Location: Abu Dhabi
Posts: 1,484
Likes: 0
Received 13 Likes
on
9 Posts
C218 CLS63TT PP Edition1, W213 E63S
mine is set to slightly Rich
will it damage my engine !!
my tech did it before because the fuel pressure was low.
but then i changed my Fuel pupmsand assembly but didn't reset it back to normal
is it ok ?
will it damage my engine !!
my tech did it before because the fuel pressure was low.
but then i changed my Fuel pupmsand assembly but didn't reset it back to normal
is it ok ?
#14
MBWorld Fanatic!
Running rich is a way to overcome detonation as the extra fuel cools things down.... so a little rich is probably required if you have a bigger pulley / mods and much better than a little lean, well safer at least.
btw, and apologies to the OP ... Is there anyway to get a/f from autoengenuity / datalogger without a sniffer?
Last edited by stevebez; 07-24-2009 at 01:21 PM.