Fancy SAI pump/N112 delete resistors

[Bodge]

Forgive me forum, for it has been many months since my last confession...

 

I haven't been using a resistor in place of my N112 and I should have been!

 

So situation is I removed all hardware and had the SAI system mapped out years back. But the connector to N112 and the pump are just tucked away and not connected to anything. Not having a resistor seems to screw with fuelling, which cocks up the emissions test come MOT.

 

Apparently you only need a resistor where the N112 was and nothing is required for the pump.

http://www.vwforum.com/forums/f15/1-8t-sai-n249-pcv-evap-delete-thread-53800/

 

So, resistors. Found these very posh solutions:

http://www.bar-tek-tuning.com/1-8T+sekundaerpumpe+entfernen+Widerstandsaddapter.htm

http://www.urotuning.com/SAI-EVAP-Delete-Resistor-Kit-3-pcs-Mk4-1-8T-p/sai_resistor_mk4_kit.htm

 

I know any 10W 330Ω one will do, but these look all lovely and neat!

 

I wonder if just plugging the N112 back into the harness has the same effect (not plumbed in)...

 

Thoughts/advise welcome 

[YellowCar]

They're obviously more expensive but I know which I'd fit for peace of mind. They were on my shopping list for the deletes you mentioned, just figured they'd be more reliable and worth paying the extra.

[Girardi]

I've not seen these before, but theyve immediately gone on the list for when I get round to doing the deletes. Much more neat than other alternatives I've seen!

[Martin191]

Cheap as chips on rsonline - 

http://uk.rs-online.com/web/p/panel-mount-fixed-resistors/0160382/

 

It works well, I've had the fault code pop up once, but after resetting it, it's now fine.

[Bodge]

Did a lot of forum searching last night and learnt a few things...

 

You don't need to put a resistor where the motor was. The motor is obviously on a relay circuit, so the ECU has no way of knowing if it's connected or not. So you can happily leave the pump connector not connected (open circuit), but you need to keep the pump relay (marked 100) in place to keep that circuit closed as that's the side of the circuit that's required to maintain adaptive fuel trim control.

 

This circuit also includes the N112 solenoid. So you can either leave the N112 electrically connected, or fit a resistor in place of it.

 

So yeah, that explains why my cars runs rich on idle. I've not had the relay or N112 in place and it's deactivated the adaptive fuelling. What a wally. Luckily I still have all the parts so will connect both back on at lunchtime and should be sorted.

 

Note that I'm only talking about the SAI system here. Not the N249 or anything evap related (I've left all that stuff in place as nature intended).

[Bodge]

Oh and fitting a resistor or leaving the N112 in place will not stop the error code popping up. There's no way to prevent that with just resistors, so you need to get it mapped out.

 

It's been quite a few years since I first started messing about with all this stuff and always wanted someone to make a nice connector solution. Turns out loads of people are making these things now which is great. Unfortunately everything I've found so far is in the US or in Austria, so shipping is silly money for something so cheap. Will keep scouring the internet for the cheapest option, but in the meantime I'm reconnecting the N112.

 

I'm going to have a dig around at work later and see if I can find some VW connectors, then I can make my own. Looks like they just have a rubber bung on the end with a piece of heatshrink to seal it up. Assume it's just 2 wires and the resistor inside.

http://cdn2.bigcommerce.com/n-zfvgw8/yy0wvhk/products/1484/images/2092/yhst-11829566841086_2269_136975829__69874.1380907704.1280.1280.jpg?c=2

 

Someone should start making these in the UK! Where's Clive?! Sell me stuff!

[Bodge]

Hazaar! Managed to get a connector and terminals, so will make my own!

[Bodge]

Just to close this off..

 

After fitting the relay and N112 back in place (electrically) but leaving the pump disconnected as before, it's sorted. Exhaust no longer stinks like hell on idle. 

 

I've run it for a week on the standard map to see what pops up and all I got was the "incorrect flow" error code and the CEL after 2-3 days of running. 

 

One other thing I noticed was that my map appears to deactivate the second o2 sensor. Presumably so I can run without a cat and not throw a CEL for cat efficiency. Which is nice to know!

 

Not made up that connector/resistor yet, but got most of the bits.

 

Putting the map back on after getting used to standard power again feels amazing by the way! Feels like a monster again!

[David 8]

Afternoon squire. You still rocking that car ..... how long is that now ??