[Mk2] [Turbo] Shocking MPG, can a faulty exhuast really do this?

[toxo]

PCME = ECU

[Drifter]

right then, time 2 get me voltmeter again lol, be back in a bit hopefully with some more things rulled out

Dave

[Drifter]

hmmm well checked the volts at the trminals like it said for error code 24 and the cicuit is ok, so im guessing the air intake temp sesnor itself is damaged, where is this on a revII tubby 1993? So i can check that out.

Just checked cicuit for error 31 air flow sesnor and that is ok, so im guessing that is damaged also. Are these both in the AFM? as its kinda pin pointing it to the AFM....

Thanks
Dave

[Nails]

I had those afm codes when I took the 2 little screws out of the afm and then snapped the circuit board inside the afm Mine wouldnt idle though but I think I had a couple more codes too all afm related.
Im only getting around 240 miles per tank on mine, and thats mostly 60 mph driving not much boost. Dunno if thats normal, seems more thirsty than I would of thought.

[Drifter]

i wish i could get 240 miles 2 a full tank, its looking at around the 180 mark if that atm

Dave

[toxo]

Air intake temp sensor goes in near the AFM. I've got a Rev3 so not quite sure where, but in mine it goes into my apexi intake kit. I would presume with an AFM it goes the other side. It looks pointy and is 2 wire. It is the same as the one attached to the engine lid.

[Drifter]

Never seen that on my car...... even had the whole induction lot out... maybe its missing

Dave

[toxo]

Would explain why it's not working!
Look at http://img322.imageshack.us/img322/1445 ... itsbp1.jpg
On the apexi intake kit in that picture, there is a rubber grommitted hole in the underside. That's where the sensor goes on that particular kit, but I am aware that's for Rev3+ N/A...

[Drifter]

nope mine dont have that hole for it guess im stuck again, + thats only the temp sesnor, guessing the afm is still fubard

seems like i may have 2 go down the link ECU or apexi power FC 2 solve this simple problem

Dave

[toxo]

Nah we can solve this... It's really straightforward, I've just never played with Rev2's before, so I have no idea where the temp sensor normally sits.

Edit: I am *sure* the hole should be on the intake kit, it would be on the other side of where the apexi logo is, so you'd need to feel round underneath it (nearest the road) to find it?

[Drifter]

Right what i'll do 2moro is remove the afm remove the apexi and have a look around take pics etc lol, at blackpool this weekend so wont be wokring on the car after 2moro

But Blackpool is gona ba a large weekend of beer and other stuff

Dave

[BenF]

FWIW the temp sensor is part of the AFM body. The AFM could well be faulty- the carbon tracks can get damaged or worn out with age, and can cause odd problems as the ECU can't work out the fueling accurately.

So - I'd follow the workshop manual process to test the AFM.

[toxo]

Be careful when removing the AFM, remove the cable by removing the clips, NOT undoing the 2 screws!

[THE DUKE]

On the same note i have error code 31 as well.. but i have no AFM...

I think 31 on a rev 3+ is MAT sensor!?!?!

[Drifter]

On the same note i have error code 31 as well.. but i have no AFM...

I think 31 on a rev 3+ is MAT sensor!?!?!

yes that is correct mat or map i believe bud HTH,

gona try this testing the AFM out if i can find it my bgb cd....... although the volt tests were all ok.....

Dave

[Drifter]

ok well im 100% officialy stumped just dug out the testing of the AFM pretty simple really just gotta measure resistence between the pins in the AFM compared to this comparison table :-

Application & Terminals Ohms
E2-VC ............................................ 200-400
E2-THA
-4 F (20 C) .............................. 10,000-20,000
32 F (0 C) ................................... 4000-7000
68 F (20 C) .................................. 2000-3000
104 F (40 C) .................................. 900-1300
140 F (60 C) ................................... 400-700
E2-VS
Measuring Plate Fully Closed ................... 200-600
Measuring Plate Fully Opened ................... 20-1200

and well mine meets all of those, which means the AFM sesnsors are OK? and the 02 sesnor is ok...... so why am i getting these error codes?

Just becasue of a damged exhasut?

Thanks
Dave

[BenF]

Dave, try opening and closing the AFM flap slowly - and look for any sudden jumps in resistance.

Failing that, if you can find someone near you that you can go to and swap the AFMs between cars that will help you rule out / in it as the cause of the problem

[Drifter]

Dave, try opening and closing the AFM flap slowly - and look for any sudden jumps in resistance.

Failing that, if you can find someone near you that you can go to and swap the AFMs between cars that will help you rule out / in it as the cause of the problem

Now that is a pretty dang good idea well i've just moved the Apexi filter 2 as close as the side vent as i possibly could, as it was quite a way back IMO, gona reset the EFI and try that now, prob be the same

Dave

[Drifter]

yup it was the same, is it 100% true that removing the EFI fuse resets the error codes? as i cant see how error 47 keeps showing when it doesnt exsist on my car lol.

Dave

[BenF]

yup it was the same, is it 100% true that removing the EFI fuse resets the error codes? as i cant see how error 47 keeps showing when it doesnt exsist on my car lol.

Dave

You need to pull both Fuses ( at least in my old Rev2 ) - there's one in the front as well as the fuse box at the rear.