M

mightywolf

New Member

• Jul 25, 2012

• #1

Ok, just when I thought I had a light at the end of the tunnel.........

When I rev the RR (4.6 petrol) I'm getting black smoke. The running is pretty rough and seems under powered. Seems a little hesitant to get off the mark aswell. Fuel consumption is very very bad. 6mpg according to the trip computer.
So far this week I've done:
1) engine flush, oil, change, oil filter change, air filter change
2) New plugs and leads.
3) 2 new lambda sensors
4)new MAF sensor
5) new brake actuator
6) 2 new front abs sensors (still showing abs fault)
7) 2nd hand ultrasonic detector (that cleared the alarm fault)
8) cleaned stepper motor.

I'm starting to get a little peeved with it now!! It also smells quite heavily of petrol when I'm driving, but there are no obvious leaks.

Any ideas on where to go next???

 

elsie

Well-Known Member

• Jul 25, 2012

• #2

Whats the air filter like ?

 

wammers

No longer with us, RIP

Donater

• Jul 25, 2012

• #3

Badly over fueling. Did you have it on diagnostics before fitting all the bits or were you just guessing. Guessing i presume. Find someone with diag it could have saved you a fortune.

 

M

mightywolf

New Member

• Jul 25, 2012

• #4

I got it plugged in and it came up with both front abs sensors ( I changed them and the light is still on).
And it came up with an o2 sensor so I changed em both.
Everything I've changed it needed, the only "guess" part was the MAF I replaced today and I was sort of hoping that might have sorted it
I haven't even had the damn thing a fortnight, so all the service items I would have done anyway, inc plugs and leads.

 

wammers

No longer with us, RIP

Donater

• Jul 25, 2012

• #5

mightywolf said:

I got it plugged in and it came up with both front abs sensors ( I changed them and the light is still on).
And it came up with an o2 sensor so I changed em both.
Everything I've changed it needed, the only "guess" part was the MAF I replaced today and I was sort of hoping that might have sorted it
I haven't even had the damn thing a fortnight, so all the service items I would have done anyway, inc plugs and leads.

Click to expand...

OK but it is dramatically over fueling for some reason, so i suggest you get it stuck back on diag.

 

2.0_hippo

Well-Known Member

• Jul 25, 2012

• #6

Unusual for black smog from a petrol ? First for me ! Lol

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Jul 25, 2012

• #7

It is unusual, but not unheard of...

Usually means it is overfuelling or heavily carbon deposited...also could mean the exhaust system is fouled too....

Wammers, is it possible to reset the fuel trims on the 4.6?? He doesn't mention year, and I am guessing only certain years were resettable...could the fuel trims be way off causing a chronic overfuelling??

 

M

mightywolf

New Member

• Jul 25, 2012

• #8

sorry should have said, its 1998 4.6 ltd.
Poor thing looks like a diesel when you put your toe down

 

wammers

No longer with us, RIP

Donater

• Jul 25, 2012

• #9

Saint.V8 said:

It is unusual, but not unheard of...

Usually means it is overfuelling or heavily carbon deposited...also could mean the exhaust system is fouled too....

Wammers, is it possible to reset the fuel trims on the 4.6?? He doesn't mention year, and I am guessing only certain years were resettable...could the fuel trims be way off causing a chronic overfuelling??

Click to expand...

Think it maybe something more than fuel trims. Only diag can help him i would think. Crystal ball a bit foggy to night. Won't be doing his cats a lot of good either.

 

fett

Well-Known Member

• Jul 25, 2012

• #10

if you keep moving about your driveway and revving it you can re-tarmac your drive for the price of pertol

 

treeman

Active Member

• Jul 25, 2012

• #11

What about dirty or knackered injectors dumping fuel in some of the pots instead of spraying it in just a thought.

 

M

mightywolf

New Member

• Jul 25, 2012

• #12

Just found an old thread about this and it turned out to be the engine ecu at fault? Symptoms seemed identical to mine and after replacing everything like me, it seems the ecu wasn't sending the correct signal to the lambda sensors and messing up the fueling.
I have a feeling its been running like this for a long time before I got it.
Had a quick look on the flea bay and second hand ecu's ain't too expensive. Might be worth a shot?

 

M

mightywolf

New Member

• Jul 25, 2012

• #13

fett said:

if you keep moving about your driveway and revving it you can re-tarmac your drive for the price of pertol

Click to expand...

Now your laughing at the thought of that but it really does leave black sooty spots on the drive underneath the exhausts lol

 

H

Hanchris

New Member

• Sep 12, 2012

• #14

Did you ever get to the bottom of this problem ?

 

gfromleeds

Well-Known Member

• Sep 12, 2012

• #15

wrong plugs?

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

Full Member

• Sep 12, 2012

• #16

If compression & leads are good then ECU sounds like a good starting point to me.

 

wammers

No longer with us, RIP

Donater

• Sep 12, 2012

• #17

gfromleeds said:

wrong plugs?

Click to expand...

Yeah maybe two stroke plugs would be better.

 

gfromleeds

Well-Known Member

• Sep 15, 2012

• #18

wammers said:

Yeah maybe two stroke plugs would be better.

Click to expand...

i ment gap size
but yea