[s-cars] mileage with MTM1+

[kbogach at comcast.net]

Chris, spark plugs are right (from SJM), connectors and filters are new. I doubt exhaust is the problem. 
No codes from ECU. Engine works steady at idles and pulls well at boost (the latter is where I can be wrong). 

I don't know which injectors I have and if they need cleaning, and how to clean them. I also don't know fuel pressure - need to install inline gauge asap. 
Need to check if O2 sensor' heater works (not sure how it would manifest if it is not). I don't remember when I checked temp sensors last time. 
MAF was cleaned a year ago and it did not changed anything. Need to check for vacuum leaks. No obvious leaks. 



Konstantine 
Car is getting new paint tomorrow! 



----- Original Message ----- 
From: "chris chambers" <fastscirocco_2000 at yahoo.com> 
To: "Konstantine Bogach" <kbogach at comcast.net>, "s-car-list" <s-car-list at audifans.com> 
Sent: Tuesday, August 31, 2010 11:09:42 AM 
Subject: Re: [s-cars] mileage with MTM1+ 



Konstantine, 

Because you haven't mentioned any check engine lights I recommend starting with basic maintenance first to give you a known good baseline. 
But if the light is on check the codes. 

1. What is the age and type of spark plugs? If unknown replace 
2. Check sparkplug connectors, I think they are $8-10 each if unknown age or in doubt replace 
3. Air filter - change 
4. Oil/filter change 
5. You can clean the maf sensor - maf cleaner is available 
6. The O2 sensor would be suspect but it's only one year one so I wouldn't replace it just yet; what O2 sensor did you use? 
7. Exhaust - In a previous post you mentioned that your exhaust is in bad shape, is it possible your catalyctic converter(s) is partially plugged 
or has broken down and has partially plugged your exhaust? 


HTH 
Chris 






From: Konstantine Bogach <kbogach at comcast.net> 
To: s-car-list <s-car-list at audifans.com> 
Sent: Tue, August 31, 2010 12:36:20 PM 
Subject: Re: [s-cars] mileage with MTM1+ 

Based on responses (thank you!) I think I have a problem somewhere. 
18-20 mi/gal on average on RS2 convert is much better then me having 
max. 18.5 with only MTM 1+ chip at mixed driving (I even would not 
call it "city" around Princeton, NJ). Cruising on highway at ~78 mph 
does not make it better than 21-22 mi/gal. 
What should I check? Ok, I will go over O2 testing again (1 year old 
one). What else? Can MAF be failing gradually? 
Thanks. 
Konstantine 

Sent from my iPhone 
_______________________________________________ 
S-CAR-List mailing list 
http://audifans.com/mailman/listinfo/s-car-list 
http://www.audifans.com/kb/List_information