A160 Rough start - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 07-26-2011, 11:54 PM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
A160 Rough start

Hi guys, did some searching on the forum but could not find a clear answer, my a160, does not like cold starting at all, at the first attempt i would turn the engine over and it would sound like it just wants to start but fails, then on the second attempt it would start but will barely idle, then i rev it up a bit for 30 seconds or so then its fine for the rest of the day. next morning, same thing. Please advise
Benzina159 is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 07-27-2011, 01:01 AM
BenzWorld Elite
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 8,898
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
What have you examined, cleaned or changed? You must start eliminating possible problem areas.
keyhole is offline  
#3 (permalink) Old 07-27-2011, 01:01 AM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
ok, update, stored codes is the p0170, no wit seems it can be a lot of things, mafs, ecu, lambda etc. but which one is it? of course now that i started the car and it will be fine for the rest of the day im not getting any fault codes or mil lights, so could it be that my maf is just dirty or something to that effect?
Benzina159 is offline  
#4 (permalink) Old 07-27-2011, 01:04 AM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Quote:
Originally Posted by keyhole View Post
What have you examined, cleaned or changed? You must start eliminating possible problem areas.
nothing yet, i bought 2 of these cars about a week ago, one of them runs sweet but this one seems to be the problem child
Benzina159 is offline  
#5 (permalink) Old 07-27-2011, 12:24 PM
BenzWorld Elite
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 8,898
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by Benzina159 View Post
ok, update, stored codes is the p0170, no wit seems it can be a lot of things, mafs, ecu, lambda etc. but which one is it?
"P0170 Fuel Trim Malfunction. Check vacuum leaks first or faulty air mass flow sensor".

MAF can be cleaned with the right aerosol. Most folks replace, but depends on mileage.

This previous thread might help: http://www.benzworld.org/forums/w168...af-sensor.html
keyhole is offline  
#6 (permalink) Old 07-27-2011, 10:45 PM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
cleaned it but no joy, will start investigating vacuum leaks and also o2 sensor apparently must be checked?
Benzina159 is offline  
#7 (permalink) Old 07-27-2011, 11:45 PM
BenzWorld Elite
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 8,898
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
O2 sensors tend to last about 100k miles - what's the mileage here?

You might consider cleaning the throttle actuator as we discussed here, as this is known to affect engine performance.

http://www.benzworld.org/forums/w168...-no-power.html
keyhole is offline  
#8 (permalink) Old 07-28-2011, 02:09 AM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
yeah mine has 102 000 miles....... going to explore 3 paths here, the valve actuator, o2 sensor and fuel pump filter.
Benzina159 is offline  
#9 (permalink) Old 07-31-2011, 08:57 AM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Thanks for all the advice keyhole, i really appreciate it im starting to lose hope here, ive swopped the valve actuator and the filter and still same problem im also really starting to think its a fuel pressure fault rather than the o2 sensors because of various reasons and also both sensors output 0.50 volts which i believe is healthy? so im going to either have it scanned by a proper scanner at a MB dealer :'( or swop the fuel pump, still deciding........ any advice will be appreciated, oh yes and by the way the check engine light does come on when it misfires and all that, it just seems the guy before me removed the light from the cluster (sigh)
Benzina159 is offline  
#10 (permalink) Old 08-03-2011, 03:38 AM
BenzWorld Junior Member
 
Date registered: Jul 2011
Vehicle: 2001 Mercedes Benz A160
Location: South Africa
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
only have the fuel pump left to test, swopped the o2's also and no change so if it isnt fuel pressure then i guess its none other than the 'ol MAF grrrrr this car is aggravating me
Benzina159 is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W168 A-Class


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
a160 ecu swap non start ginger mech W168 A-Class 2 07-17-2010 03:35 PM
260e rough start/rough idle/shudder CaprezMercedes W124 E,CE,D,TD Class 14 05-25-2010 01:36 PM
All of the warning lights start flashing when A160 started cold. aser011 W168 A-Class 0 04-11-2010 06:49 AM
A160 - 2003 Manual Transmission - Wont Start born3flyin W168 A-Class 0 01-13-2010 02:24 AM
A160 Ecu Set start error Star automotive solutions For Sale/Wanted/Trade/Giveaway 0 01-02-2010 03:00 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome