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Extending AFM wiring

Peter Empson

Peter Empson

PCGB Member
Silly question perhaps, but I need to move my AFM and the cable isn't long enough, I've looked to try to find the male and female connectors needed to make an extension cable but can't source them. Just before I cut the wire and splice in an extension I thought I'd check to see what others have done in the same situation?
 
Probably stupid question but are sure its not long enough and not held down somewhere out of site? I can't see any harm in splicing in new wires, I've done it myself on my runabout and didn't get electrocuted once! [:D]
 
A similar AFM was used on some old Volvo, Audi and Alfa Romeo. Look out for them at breakers yards.
 
Finding such plugs and sockets is not that easy. Automotive diagnostics require the use of such things to create 'break-out boxes', which allow connection into the loom to take a sample reading. A good idea, but difficult because of essentially the same problem - getting hold of the plugs and sockets.

Splicing may be the best option. (And good soldering with heat-shrink will be more reliable than push-fit plugs.)


Oli.
 
Never needed to attempt it before but resistance measuring systems can be wired to compensate for the resistance of the wires and connections within that system, i should assume that in a system with such a high accuracy requirement this is so and you won't compromise the overall system integrity by splicing.
 
ORIGINAL: TTM

A similar AFM was used on some old Volvo, Audi and Alfa Romeo. Look out for them at breakers yards.
Click to expand...

I think that youre on the right track here, but Id suggest using a Porsche lead, cut at the end farthest from the airflow meter. Id then remove the plug from your cars AFM lead at the meter end. This way youll only be making one join rather than two, which has to be better.

The looms are worthless now and have been for years, so they stay in scrapped bodyshells: Id expect to get one for a pound or two.
 
On reflection, resistance shouldnt be too much of an issue: because the AFM is disregarded over 4,000rpm and I expect your car to spend most of its working time here...
 

ORIGINAL: Peter Empson

Just before I cut the wire and splice in an extension I thought I'd check to see what others have done in the same situation?
Click to expand...

They must be available from somewhere because John at Vitesse Racing sells the plugs with wiring attached for those that don't want to splice in when they fit his MAF.

IIRC he charges $50 for the plug and about a foot of wire - I'd check the breakers [;)] or just splice in some extensions
 
Thanks for all the feedback everyone, thats helped me make my mind up. I have some multicore cable that I think should be suitable, so I'll probably just splice in a new length, I can't see the resistance being an issue if soldered (and besides I'll be setting the A/F so would have thought I could correct it if there was a slight issue).
 
I would think it would be fine just to splice in like you say, the resistance of an extra bit of wire in relation to that of the AFM is tiny. Is the cable shielded? That might be the other issue.
 
Thanks Jonathan, that's really appreciated. I've been doing quite a bit today and I have realised I might just get away without extending it if I'm able to position everything just so (which of course means if it doesn't reach it'll only be short by an inch or two which will be much more frustrating!). Not sure if I'm going to have time to find out tomorrow as the red one is off for an MOT which will probably use up most of my day.
 
Peter,

Being a gent of infinite resource and sagacity I'm sure you have already realised this, but don't be tempted to run the wire too tight. Things move around in engine bays, and while it may *just* reach while stationary it may be given a fair tug while driving hard (not that you would do such a thing of course!) which could be bad news.

Just a thought.


Oli.
 
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