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[Webby the Bear]

... as above guys. Checked on TC site and they're £105.39 + VAT each 

I know that regarding my fuel consumption issue I shouldn't throw parts at it. But I've replaced almost everything related to it apart from my new inlet/injector assembly (going in this month) and the o2 sensors (praying weather holds to replace diss pac tonight).

Anyways, is it best to stick in a wanted ad? and is there a way to test them if i buy used ones? or are pattern any good? i vaguely remember someone on the net heating it up and watching for resistance change but unsure.

 

[Webby the Bear]

ps i am testing over a period of time each thing i replace so i'm hoping the disspac change will help.... this is just in case 

[Kevin Wood]

Diagnose the fault properly then replace the one faulty part, Webby!

[Webby the Bear]

Diagnose the fault properly then replace the one faulty part, Webby!

i plan to mate  just planning ahead should the disspac, fuel rail etc not improve things

[tidla]

If you have a half decent code reader/scanner, you should be able to see the sensors doing there job on the graph and compare the pattern/ voltages.

[Marks DTM Calib]

Diagnose the fault properly then replace the one faulty part, Webby!

i plan to mate  just planning ahead should the disspac, fuel rail etc not improve things

Take a step back and learn what the O2 sensors do and how they do it.

Then re-consider if what you are doing is the correct thing or not. 

[cem_devecioglu]

Webby, dont know if you plan to use the car for long
but in any case if I were you I wouldnt buy used lambda sensors..
 
they are not immortal as as people claim

[Webby the Bear]

 

Plan to keep her forever mate 

[albitz]

Approx £340 a pair retail or £230 on TC. 

[tigers_gonads]

Are they switching ok webby ?
0 - 1000 mV ish iirc 

I will be breaking my v6 in a few weeks (fingers crossed)
I know the pair fitted are working if its any help 

[Webby the Bear]

cheers guys 

here's a random thought......

can a failed or collapsed lifter be a possible cause of my high fuel consumption?

i know i have the lifter tapping.... and wondering this.......... if its one of the inlet valves thats not opening/not opening fully could it register a lean mixture and the ECU chuck more fuel in?

just a thought 

[feeutfo]

Webby mate, we can't really answer, we've got no info.

What's the fuel economy figures?
What's been done so far?
What does tech 2 say?

First shout on fuel economy IMO would be multi rams, cam belt kit set up, blocked exhaust, old fuel filter.
Then I'd paper clip it for codes.
Then I'd get it on tech2 with one of the guys here for possible maf, air leak, or O2 senor problems depending on the readings.

Only then would I look at changing sensors if tech 2 showed evidence of a problem.

If I needed to swap them out, I'd get genuine Bosch from a factors. £51 each last I looked, but probably gone up since, for a face lift one.


But then... How much, more or less,  of that has been done already...?

[Webby the Bear]

Webby mate, we can't really answer, we've got no info.

What's the fuel economy figures?
What's been done so far?
What does tech 2 say?

First shout on fuel economy IMO would be multi rams, cam belt kit set up, blocked exhaust, old fuel filter.
Then I'd paper clip it for codes.
Then I'd get it on tech2 with one of the guys here for possible maf, air leak, or O2 senor problems depending on the readings.

Only then would I look at changing sensors if tech 2 showed evidence of a problem.

If I needed to swap them out, I'd get genuine Bosch from a factors. £51 each last I looked, but probably gone up since, for a face lift one.


But then... How much, more or less,  of that has been done already...?

sorry chris, i keep assuming people have read my many stoopid posts 

this was my original techII read out...


O2 BLMs:
Integrators, around 100 (low)
Idle (B1 - 190, B2 - 160) (high)
Partial Load, around 130 (good)

Air/fuel ratio (Rich/Lean) seemed sluggish at idle, flipped at about 1Hz at 2000rpm, lazy lamdas, both banks.

Reset BLMs, took for drive, all around the 130 mark, except at idle, when integrators crept to 150ish, with Air/Fuel showing lean until then, then flipped at 0.33 - 1Hz

Seemed slightly down on power to me, although Webby said otherwise. MID readings for instantaneous consumption seemed quite low - I'd expect mid to high 30s average when cruising 50-60mph, reality was mid/high 20s. MID has correct 035 config, and readings seem to match Webby's experience of it using more fuel recently. This leads me to suspect that the engine is really using that amount of fuel, rather than leaks (which I couldn't detect, or smell).

After test run, brakes still cold. EGR can get to about 55% before the thing really splutters. Injector cut-off exactly as expected.

MAF, at idle, with A/C off, 9kg/hr.

so far ...

replaced fuel filter

i've vacuum leak tested (no vac leaks i can find)

voltage leak tested (visual inspection and with bit of water... no sparking/arcing that i can see)

checked for exhaust leaks by me and by garage. no leaks. emissions test also came back perfect.

replaced MAF sensor with one cleaned with lots of electric contact cleaner...seems at first glance to have improved the MID readings but i'm no expert and will be doing brim to brim test as soon as i can afford it  also seems to be more responsive.
 
purchased spare fuel rail/inlets/injectors and will be taking to get them tested and putting that in after to rule out injector leaks

on markDTM's advice i have a good known disspac (thanks mark) that ill be swapping out this weekend

IF after all the above i can only think of checking timing, CTS, stat and o2 sensors.

sorry again for the ''constantness'' but i really want to get the best fuel economy as possible 

[Webby the Bear]

oh and cleaned EGR too 

[feeutfo]

Have you got another known god maf to try?

They don't take too well to cleaning I'm told.