lightwave693

problem i have is that i have fitted a swoosh AFR to my 98uk turbo wagon. when comming on boost it goes right into the lean part of the gauge. its numbered from 10 (super rich) and 20 (super lean) with and optimal part in between. at full boost the needle is on 20. on decelleration and no throttle at all its on 10. part throttle and crusing its bouncing around which i have read is normal. its wired to the lambda in the down pipe which i understand is not very accurate. its as soon as boost starts building it goes lean.

read on searching here that maf failing can cause lean running, so did the unplug test and the engine cut out instantly. kinda glad of that.

so next i bought an inline fuel pressure gauge which i installed and on idle with the vaccum disconnected reads 3.2bar, vaccum connected reads 2.8 bar. is that normal?

i then clamped the fuel return hose and the pressure when upto 4.6bar... is that ok?
does that show that the fuel pump and FPR are working ok?

the fuel pump and FPR are standard items.

what else could it be? lambda or just a ****ty gauge, anyway to test them?

Sorry for all the questions but i dont wanna melt my engine!

Thanks all

Rich

GazJenno

The engine should run lean on overrun/no throttle but yours it going to super rich from what you said?

lightwave693

thats right, say when coming off the motorway, downslip road with no throttle at all its pointing to 10, super rich.

GazJenno

you sure 10 is super rich and not super lean? and that 20 is super rich?

Just found a pic of a swoosh gauge and you are right, although your readings are backwards? dunno if it can be wired up backwards?

lightwave693

thought has occured to me but its says 10 - 13 is rich, says rich under these numbers, then 13 - 17 says optimal then 17 - 20 says lean..

if you goto Automotive Dials Gauges pods t-piece then click air/fuel gauges the one i have is the smoky 52 52mm swoosh gauge. only got this one because it matches my other ones. and they work very well.

GazJenno

yea I have seen it and edited my post to correct.

Think you should edit yours as you said 17-20 is rich but you mean lean

very confusing already

lightwave693

oops, well spotted the wires on the gauge are red, white, black and green. green is the signal, black is ground. red is ACC+ and white is perm +.

the only thing that i can think of that might be causing a problem is that i connected the red and white to the same point behind the radio and not white direct to battery for a permenant feed. thought why would a gauge need a permenant feed when the ignition is off.. this wouldnt reverse readings would it?

Cheers for your help

GazJenno

I dont see how the way you rigged it up would be causing this.

I dont think I've helped much at all

usual things that give bad readings are:

MAF
Lambda
Gauge

let the elimination process begin... either borrow or buy the new components? although expensive havin a spare Lambda or MAF cant do any harm except to the wallet.

Gaz

lightwave693

i read on here....done a lot of reading on here.... that foam type panel filters can cause a dirty maf.. so might give cleaning that a bash. lambdas are only 30odd quid for a universal one so not too bad. seems fuel pump and FPR are ok.

how can i test the gauge?

GazJenno

Seeing as the Fuel pump and FPR are ok what is leading you to think the cars running lean? Just the gauge or does it feel like something is wrong?

lightwave693

nope just the gauge has put the idea in my head. seeing that the fuel pressure was good and the maf unplug thing was good then gauge or lambda... lambda is the original i think and the cars done 96k now so prob past its best. ill test the gauge some how. if the car was running that lean then surly check engine lights or bad running would be noticed. cars running like a dream

cheers

Rich

GazJenno

Check the voltage on the Lambda sensor should be between 0.2v and 0.9 volts (0.9 volts being rich) suppose you could start it cold and check it as it should run rich when cold.

You could then check the voltage at the gauge on the lambda signal wire.

You could also test the gauge by sending 0.9volt down the signal wire and see where it points.

if you read some more you could find the right voltage readings for the MAF sensor when idling then check to see if they match up to what they should be.

Gaz

lightwave693

nice one ill give that a go in the morning. ill look for MAF voltages to check that too

nice one.

Pint in the post

lightwave693

should the fuel pressure gauge be moving from 2.5bar to 3.2bar on each burble on tick over? wasnt doing it last night when i fitted it but is tonight after the drive home from work.


rich

spit

these may help
New Page 1
Lambda sensors / exhaust oxygen sensors

although it is from a later model it does give the MAF voltage on the ECU pin outs

lightwave693

just been out with the trusty multi meter and the more voltage the gauge gets the leaner it goes, with 0.2volts being around 12 on the gauge (rich) then 0.7volts just entering the lean part of the gauge so seems the gauge is **** backwards.

GazJenno

wierd?? Have to ask the maker and see why its like that...or just get another gauge.

At least it aint running lean.

Gaz

lightwave693

yep im glad its running rich and not lean as the gauge says. ill send an email along to the seller and to swoosh if i can find thier address.

cheers for all your help people

Rich

Andygreer

iTrader: (4)

im having terrable problems with my Swoosh Oil Pressure gauage sorry to nick ya thread.... If u find a email or address send me a PM

lightwave693

Contact Details

Unshun(Swoosh) International Co Ltd
No. 5, Lane 28
Ting Liao 1st Street
Pa Li Hsiang
Taipei
Taiwan 249
Tel: (886 2) 26187399
Fax: (886 2) 26187398





Homepage Address
Unshun(Swoosh) International Co Ltd
Other Homepage Address
www.unshun.com.tw

SwissTony

iTrader: (19)