Club G40 Forum
Technical => Engine and Transmission => Topic started by: matthg40 on August 25, 2018, 03:01:56 pm
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Does anyone know the best place to get a replacement map sensor?i can look myself but rather than buy the first one I find I’d rather ask if anyone ones he best place to buy and save myself a few quid rather than spend more tHan I need to.cheers matt
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Nice to meet you my new old matey!!
Just to check our logic, plugged into a newly powered ecu it gives 'no signal' Map sensor fault.. That'd be right wouldn't it Paul? Just sitting at 45%
Anyone solder swapped a sensor and got the old?
It said 200kpa on it, there's a few 250s that look like they might fit but would need mapping.. I just got that mezsage about one i bst similar..!
Maybe the lower load reading might make up for the bigger injectors but it should be mapped really.. Lambda control will sort most of it out i hope..
Cool mate, happy days.. honoured to meet such a nice normal engineering blole.. Thanks for the door inserts but they are the wrong side :-)
Cool!
Neal
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It was good to meet you to mate had a good time fiddling with the engine.
So basically do I need to order a replacement or are we ok with what we have and just need to play about with a few sensors and things?
I will have a look for other inserts and tell me what else you need and I will see what I have mate
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Yehaa, be nice when it's done! Yeah I know you've ordered one, can't wait!
…. but has anyone got experience of uprated sensors, that have got one even that can advise..? I bet you have seen a few haven't you Pete..? :-). What d'you recon, will it need specially chipping?
I did think after, that other chip would be worth plugging in and seeing if the PC connects to it to see if it's processing enough to send data in and out, once the sensors swapped.. !
Nice one, sorted soon
NEAL
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I’m just wondering if that’s why my old chip from pit stop stopped working because of the map sensor.it was working great then suddenly just stopped ruining the car.
I’m hoping that swapping the sensor over is going to cure the long issue of the bad running to the car.espically paying 16€ shipping fee was nearly as much as the cost of the chip.i see why the products are now cheap because the shipping prices are so high
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Kinell, that's something I do forget often, the £postage.. Sorry I forgot the DTI, it's still on the bench where I left it!
Was it the MaxRPM.de sensor units you'd found? They look like a riser PCB with 3 pins and a unit at the top... If it's like that maybe the unit on the PCB can be found...
? Does the MAP unit itself look like it's case comes to bits or is it a solid potted unit? Thinking maybe re-flow the solder on it, maybe it's physically cracked a track or just the pin-ponts... We should have tried waggling it to see if therte was any kind of change.! If you can get over here there's a few things could be tried "just quick" on it electro-mechanically. And I can plug it in my car to see if it cures it...
I've spent most of my waking day watching a 3d printer do some of those badges, stupid rain, we should be outside spraying..!
EG Replacing just this bit?
https://www.ebay.co.uk/itm/MPX2200AP-Sensor-pressure-Range0-200kPa-absolute-Usup10-16VDC/202297244684?epid=576897159&hash=item2f19dafc0c:g:x3sAAOSwEaNa3zFU (https://www.ebay.co.uk/itm/MPX2200AP-Sensor-pressure-Range0-200kPa-absolute-Usup10-16VDC/202297244684?epid=576897159&hash=item2f19dafc0c:g:x3sAAOSwEaNa3zFU)?
(https://i.ebayimg.com/images/g/x3sAAOSwEaNa3zFU/s-l500.jpg)
This is just the bit off the top of the MAX RPM one, can we get to your original ?
https://www.maxrpm.de/Boost-pressure-sensor-250-kPa-15-Bar-MAP-Sensor-incl-mounting-plate-for-easy-soldering (https://www.maxrpm.de/Boost-pressure-sensor-250-kPa-15-Bar-MAP-Sensor-incl-mounting-plate-for-easy-soldering)
(https://www.maxrpm.de/media/image/product/76/lg/dgs-00087_boost-pressure-sensor-250-kpa-15-bar-map-sensor-incl-mounting-plate-for-easy-soldering~3.jpg)
Yay, I've got test badges!
NEAL
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If you zoom in and look at that Max RPM module, it's just a PCB with 3 of the wires from the sensor going through... I'm sure we could make a cheap sensor-only work pretty easy... Guessing it's + - & vout…
I think you've bought one that's on it's way I believe it'll fix everything anyway, but if not this'd be a plan
NEAL
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Yep that’s the unit I’ve ordered from maxrpm i persume it’s inside that black sealed box.so I’m hoping when we open it up it will be inside that’s the plan anyway.
How are your badges looking?
Can’t get over to you as I’ve got little one till he goes back school on Thursday so my time is taken up entertaining him till then.and hopefully the sensor will be here then
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Perfect, see you Thursday... Be good to see the difference that one sensor makes, I recon it'll sort the engine a lot if there's nought else...! Then after we sort the brakes an that, should be going..!! I'd say put a high % of antifreeze in as cooler if the water in the cylinder was dark yellow, I've left mine with just water for a week and it is *brown* already!
Happy daze, been enjoying it thank you.! What I've been through with my Polo has taught me a lot I recon about it's systems, yours'll be the easy now I hope!
Cheers m'duck, here's to a rare thing. us G40 owners..! You've gotta love playing with them or you'd not have one, but I've had 4 less Polo engines than "A series" engines I kept blowing up…!
NEAL
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mine has a 250kpa map sensor in it, I think I bought it from Farnell or RS if I remember correctly as it was much cheaper than the maxrpm was at the time (a few years ago).
I wouldn't open it up, just replace the existing one if you think it is faulty. I've never known one to go faulty though but I guess anything is possible.
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mine has a 250kpa map sensor in it, I think I bought it from Farnell or RS if I remember correctly as it was much cheaper than the maxrpm was at the time (a few years ago).
I wouldn't open it up, just replace the existing one if you think it is faulty. I've never known one to go faulty though but I guess anything is possible.
Me neither- I have known diagnostic equipment to show a false load/map value of circa 50% when the sensor voltage output is and map sensor are actually fully working.
I'd check the sensor voltage output at 0, 100 and 200kPa before replacing it tbh.
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Yoof, yeah, that's the sort of info we needed...! :-) How do you test the pressure? Bear in mind we're on the front with limited kit!
I'm not keen on probing insde there with the box open, the PCB'd have to be hanging to get to the back to get to the pins, there's the black module covering the pins.
Hayesey, does the fact it's a 200 being replaced by a 250 need a new fuel mapping doing.? By the photo's, any old sensor would do just working out which 3 pins go where, presumably just a potential divider. Presumably 0v is total vacuum (0kpa) and 5v is the 250kpa
Cool, that's the good thing about a group of people knowing stuff, there's just not may of us left!
Bestest regards! Can't wait till the new one is here!
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Look anything like this Paul?
NEAL Neal orange PEAL!
And to check, the battery lead was off up until plugging the earth back on so should be fault-free... Clearing the faults & re-reading there was a clear "Map sensor no signal"...
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Yoof, yeah, that's the sort of info we needed...! :-) How do you test the pressure? Bear in mind we're on the front with limited kit!
I'm not keen on probing insde there with the box open, the PCB'd have to be hanging to get to the back to get to the pins, there's the black module covering the pins.
Hayesey, does the fact it's a 200 being replaced by a 250 need a new fuel mapping doing.? By the photo's, any old sensor would do just working out which 3 pins go where, presumably just a potential divider. Presumably 0v is total vacuum (0kpa) and 5v is the 250kpa
Cool, that's the good thing about a group of people knowing stuff, there's just not may of us left!
Bestest regards! Can't wait till the new one is here!
You need a miti-vac and a multi-meter (and probably a few sets of hands)
No point in replacing a 200kPa sensor with a 250kPa one. You lose resolution of the map and the cost of a bespoke map would be far greater than a new ECU (if indeed the map sensor is goosed)
I'll still be surprised if it is knackered, I've seen them full of methanol, over-pressured and all whilst being 20+ years old.
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So have I just spent €41 on a map sensor I don’t need then.i did wonder why maxrpm were so quick to sell it to me
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yes if you change for a 250kpa sensor you'll need a full remap to suit.
But as yoof is saying, don't use a 250kpa one unless you need it, 200kpa equates to one bar of boost in normal terms (relative pressure oppose to absolute pressure). So unless you are running much more than 1 bar, there's no benefit.
So you'd want a 200kpa one but I'd be amazed if yours has really failed.
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I am running over a bar of boost as I’ve got the smaller belts and pullies on and the r1 supercharger but it’s never been an issue in the past
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Is anyone in the market for a 250kpa map sensor I have one going spare I’m willing to sell what I payed for it €25
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Oh bollocks, could have done with finding a bit sooner...
Is a custom map out of the question? The G60 injectors should have had a special one done, I think might be that other chip...
Is there a 200KPA one out there...
Not looking good is it sorry matey.. Initial enthusiasm probably got the better... Best get proper people in!
NEAL
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Suppose I'll give you the the £25 too I can make a little boost gauge with that and a little TFT scope-kit that's coming.. Get your pressures tested with that meter and link up for the cash in town or something next giro day...
It came with the smaller pulleys, are they going back on? If it's all going back to standard then is probably best get an ECU. For the ten minutes it'll take to swap the unit I'd try it still, if it idles it's improved!
Could the small pulleys have blown the 200KPA one?
NEAL
I cannot find my phone for the life of me but I'll be in touch... Hopefully it'll glow in the dark somewhere here
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FooKIN PHONE, WHERE IS IT..? I'd ring you Matt to say,
wanna bring the ECU over here and try it in my car? Seconds to swap and see if the same faults appear, Thurnby lodge.. I know it won't do hurt my wiring where I can't offer plugging my ECU into anyone elses wiring I would be bound be a bit prang ..!
Cor, might be worth getting that £9 lead off ebay to plug in...!
Paul, what chip did you use with your uprated MAP, toothies and big injectors? Can we copy it, I've got access to the kit if I needed?
I wish I'd took a screenshot of VCDS, I'm worried now they were stored codes....
And it rained so twas only a quick look really!
Neal
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Part of me is a little concerned now I was hoping there map sensor may of been the problem.espically as the plugs are coming out so black.i was quite confident the other day but now I’m swaying towards being concerned again.i have no idea what the hell this garage has done to my g40 and unsure of where to go with it next
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Cool, see ya Thursday...
This is the lead I got (and we know works) is a KKL lead.. I've only had it 3 months but it has helped a lot
https://www.ebay.co.uk/itm/USB-Cable-KKL-VAG-COM-409-1-OBD2-II-OBD-Diagnostic-Scanner-VW-Audi-Seat-UK/202004132989 (https://www.ebay.co.uk/itm/USB-Cable-KKL-VAG-COM-409-1-OBD2-II-OBD-Diagnostic-Scanner-VW-Audi-Seat-UK/202004132989)
and that was VCDS downloaded free from RossTech that was running it on mine £4.50... It'll do all sorts of VAG cars with the supplied CD but not the MK2 Polo..
The 2x2 ODB to Polo adapter lead needed is £5,
https://www.ebay.co.uk/itm/VOLKSWAGEN-VW-AUDI-SEAT-2-2-OBD2-ADAPTOR-CABLE-LEAD-2X2/380199944759 (https://www.ebay.co.uk/itm/VOLKSWAGEN-VW-AUDI-SEAT-2-2-OBD2-ADAPTOR-CABLE-LEAD-2X2/380199944759)
If the fault does persist I think its worth reflowing the PCB solder around the sensor connections, if it's new ECU time it is worth a go..
Cool
NEAL
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Kool nice one mate thank you for the links I will get them both ordered and get the software installed on my laptop for future reference.
I guess the next thing would be locating someone to sell me an ecu if they have a spare one.theres not many of these left but there must be spare ecu units in circulation.so will have a tinker on Thursday and work out a plan of action.
Will txt you tomorrow to sort out arrangements mate
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:D x 10^6
I cannot find any 200 sensors except some real expensive Motorola ones.. I'm still trusting the ecu diagnosing itself, mine doesn't mention mine having no signal following a long battery disconnect..
i bet we can test the load-value changes using a bike pump.
The same ecu appears in TDi's, (stick your chip in) or i bet the sensor is the same in a few that era but i dont know anything more than google... there's a vw scrapyard on green lane road, lets see if they've got one..
Get Vcds installed you can borrow my leads until they come
Cool
Neal
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I think this is it:
https://uk.farnell.com/nxp/mpx2200ap/ic-sensor-abs-press-29psi-344b/dp/1457149?st=200kpa%20pressure%20sensor
Might be worth trying Neal's ECU if you can though before you start attempting to de-solder your map sensor
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Ok, that is cool Paul, you are the legend i always believe you are ta.. I think the ecu will be worth playing with as a spare if it comes to another coming in replacement . We need there to be a load of lucky with the weather tomorrow.. Test the fuel pressure.. aee if any faults throw up with the engine running. Look for the lamda waving..
like i say Matt i know fork all compared to most g40 people, but i have got mine going i thought impossible..
I trust machines too much considering but I'm used to big printers that know exactly what gwan because they have multi core processing... 25year old stuff might be a bit confused i knew how it felt once.. :-)
we're just spraying the bonnet in backyard sun.. beaut!
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Mate I trust you more than some of the clowns I’ve let loose on my car.i think between us we will get it running perfectly.it isn’t far off it sounds almost perfect on tickover but it’s is just hesitating on accelaration and don’t have boost.but between us we will get it I’m sure
Hope your having a nice afternoon spraying mate