18 MPG! help?

1. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

   #1 26th March 2010, 12:16

   All time lowest MPG which has slowly deteriorated now lol.
   car hasnt been serviced for 8,000 miles but still..seriously.. 18 MPG
   no engine management lights on engine is tuned (PT40 cams) but still see no real reason for it to be this low.
   
   Throttle is very jerky on/off at low revs and seems to have lost some power recently
   
   could is be MAP/MAF sensor? Just thinking something like injectors or lambda sensor would cause Engine management light to be on wouldn't they?
2. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

   #2 26th March 2010, 12:16

   Thats driving fairly reasonably too..
3. MiDnighTcLuB Frequent Poster Joined: Feb 2010 Weston-Super-Mare Posts: 672 Mapped 306 HDI

   #3 26th March 2010, 12:26

   Mate that is really poor lol !! you sure its not that because fuels gone up you thoguht it was eating it faster when its just costing more ?? i had that problem lol it wasn't the car eating fuel it was the tax on fuel eating my wallet haha
4. toju Regular Poster Joined: Mar 2010 bradford Posts: 380 citroen saxo vtr 2003,black.

   #4 26th March 2010, 12:35

   get a diagnostic check mate,could still be a fault somewhere even though your management light isn't on.
5. user_33380 Frequent Poster Joined: Apr 2009 Chesterfield Posts: 666 Saxo VTR MkII 2000(W) Posi Blue, VTR MK1 1998(R) P

   #5 26th March 2010, 12:38

   You could do with having the plugs out first mate to help see what's happening but I'd try cleaning the throttle body out and injectors first before you spend any dosh. Also is it idleing strange at all, I know you mentioned it's cammed but is it ticking over different or down on power, any flat spotting or harder to start when cold?
6. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

   #6 26th March 2010, 12:48

   Quote:

   Originally Posted by MiDnighTcLuB Mate that is really poor lol !! you sure its not that because fuels gone up you thoguht it was eating it faster when its just costing more ?? i had that problem lol it wasn't the car eating fuel it was the tax on fuel eating my wallet haha

   nahh it was 24 miles costing £7 which was 6 litres.
7. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

   #7 26th March 2010, 12:49

   Quote:

   Originally Posted by Rez You could do with having the plugs out first mate to help see what's happening but I'd try cleaning the throttle body out and injectors first before you spend any dosh. Also is it idleing strange at all, I know you mentioned it's cammed but is it ticking over different or down on power, any flat spotting or harder to start when cold?

   it does feel down on power, sort of struggling... hard to describe, not as free revving sorta.. still really easy start
8. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

   #8 26th March 2010, 12:49

   Quote:

   Originally Posted by toju get a diagnostic check mate,could still be a fault somewhere even though your management light isn't on.

   True cheers mate
9. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

   #9 26th March 2010, 13:44

   Give it a full service and strip the throttle body/ any sensors on the inlet down for a clean... particularly the MAP sensor.
   
   If you don't see any improvement, next port of call would be a new pre-CAT lambda sensor.

   1 user thanked this post: user_35312
10. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

    #10 29th March 2010, 17:44

    Little update: 72 miles to just over 3/8 of a tank lol
    
    Could anyone advise me the location of the MAP/MAF sensor as i wanna give them a thorough cleaning..
11. Cutz Regular Poster Joined: Jul 2009 Walsall, West Midlands. Posts: 388 Black Saxo VT? ;)

    #11 29th March 2010, 19:56

    I get about 24 MPG in my furio, cam'd. LOL Driving sensibly everywhere too.
    
    Cutz
12. user_8040 Saxperience Post Whore Joined: Dec 2005 MaDchester Posts: 8432 Vts

    #12 29th March 2010, 20:03

    who fitted and set the cams up? probally something to do with that too..
13. Cutz Regular Poster Joined: Jul 2009 Walsall, West Midlands. Posts: 388 Black Saxo VT? ;)

    #13 29th March 2010, 20:08

    Quote:

    Originally Posted by b0t13 who fitted and set the cams up? probally something to do with that too..

    That's what i thought with mine, i dunno who set them up, was already cammed before i got it.
    
    Cutz
14. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

    #14 31st March 2010, 10:50

    Quote:

    Originally Posted by b0t13 who fitted and set the cams up? probally something to do with that too..

    lad who owned the car before..
15. vts_power_120 L-plater Joined: Dec 2009 Posts: 69

    #15 31st March 2010, 14:48

    it could be new cat you need mate? same happend to me, my car wuz dwn on power, low mpg ect..the new cat sorted it out
16. Infamous_Nikko Infrequent Poster Joined: Jul 2008 Essex, Harwich Posts: 243 A Black Sax VT?

    #16 31st March 2010, 14:52

    My car's MPG is a joke but it's been Cammed.
    
    Pay day can't come soon enough, LoL...
17. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

    #17 31st March 2010, 16:25

    Quote:

    Originally Posted by vts_power_120 it could be new cat you need mate? same happend to me, my car wuz dwn on power, low mpg ect..the new cat sorted it out

    Got a de-cat mate! exhaust might be blowing a bit though cheers for the suggestion
18. user_22749 Saxperience Post Whore Joined: Apr 2008 N.Wales Posts: 7746 e46 M Sport

    #18 31st March 2010, 16:30

    I get about 20 mpg in my 20v Turbo and thats driving like i stole it
19. viciousjello Infrequent Poster Joined: Feb 2010 Boston Posts: 156 Year 2000 Saxo VTR

    #19 31st March 2010, 18:55

    just an idea... i dont suppose you have checked for a fuel leak? it would make the fuel and the running thing unrelated... but worth checking!
20. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

    #20 1st April 2010, 16:56

    Quote:

    Originally Posted by viciousjello just an idea... i dont suppose you have checked for a fuel leak? it would make the fuel and the running thing unrelated... but worth checking!

    Ive had a look mate, nothing blatently obvious... i go days without driving the car too so a puddle would probably be noticable and also the gauge doesn't change
21. user_35312 Established Member Joined: Jun 2009 Coventry CV6 Posts: 2477 Slowda Octavia vRS SOLD - Cam'd Chip'd VTR

    #21 1st April 2010, 16:56

    Quote:

    Originally Posted by Tom I get about 20 mpg in my 20v Turbo and thats driving like i stole it

    lol, jealous muchos
    i was actually getting more than that driving the 5.0 range rover armored at work lol