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MaseratiForumMaserati CarsA6G-Merak, BiTurbo era, Ghibli, QP IV Help please- excessive fuelling!!

Help please- excessive fuelling!!

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9/5/2011 21:31:46  

Posts: 76
Since: 16/5/2009
Status: offline 		Evening all, My baby, my 2.8 spyder has on Saturday, decided to throw a wobbly! It would start for toffee and hasn't let me down in years! It wanted to start then failed, I ran over everything making sure all correct, as ran like a sewing machine till then. I even drained tank of never use again Tesco fuel, and filled with ultimate BP, This seemed happier, but only ran erraticly then died, after hours of head scratching and Dissi checking spark checking etc Gave up, today I took out sparks and totally coked, cleaned n ran, but only of feathered throttle, then took spark out n recoked! So replacing air/coolant temp sensors Wednesday, brown n blue to us guys:) Anyone else have any ideas incase it's not a fault of sensors overfuelling?? Thanks in advance Marc
10/5/2011 0:41:07  

Posts: 7
Since: 27/4/2011
Region: Auckland
Status: offline 		I came across what sounds like a very similar problem in a friends Fiat Coupe Turbo. We spent hours mucking about with it, changing sensors and throttle position switches, but in the end the fix was ultra simple.
Check the vacuum hose to your MAP sensor (will run from the back of the inlet manifold to a black box with one electrical connector), I found on the Fiat that it was partially blocked causing the issues you describe. I removed the tube, used some carb cleaner in it then blew it through with an air line - or you could just replace it. 

See:

http://www.eurospares.co.uk/partTable.asp?M=3&Mo=710&A=1&B=42404&S=

Item number 9 is the MAP sensor the pipe is the bit to check

< Message edited by 96GhibliGT -- 10/5/2011 2:25:51 >
10/5/2011 0:57:06  

Posts: 76
Since: 16/5/2009
Status: offline 		Hey buddy, I can't remember if actually disconnected map sensor to see if made any difference? Think so, but not sure, but I'll give it a good look tommorow and see if makes difference , so cheers for Advice and I'll let you know if works or not Regards Marc
10/5/2011 10:28:56  

Posts: 228
Since: 4/5/2010
Status: offline 		crikey- I'd never have thought of that!

I'm dying to know if this'll work, now...
10/5/2011 10:43:40  

Posts: 76
Since: 16/5/2009
Status: offline 		Well I have taken pipe off as you said, but was perfectly clear. So, since new sensors here tommorow, I'll fit them and see if runs properly, Then if not, I'll look at trying another map sensor Since it does control fuel air mixture as well, I'm hoping That it's one of these two - blue /brown sensors so replacing Both, as will work wonders to running anyway So- until tommorow Any further help/ advice gladly taken And again thank you guys As I'm hoping to get it running for Saturday as maserati meet At ace cafe from 11am n all Mazzer owners welcome :)
10/5/2011 13:01:20  

Posts: 7
Since: 27/4/2011
Region: Auckland
Status: offline
quote:

ORIGINAL: mazzer lover

Well I have taken pipe off as you said, but was perfectly clear. So, since new sensors here tommorow, I'll fit them and see if runs properly, Then if not, I'll look at trying another map sensor Since it does control fuel air mixture as well, I'm hoping That it's one of these two - blue /brown sensors so replacing Both, as will work wonders to running anyway So- until tommorow Any further help/ advice gladly taken And again thank you guys As I'm hoping to get it running for Saturday as maserati meet At ace cafe from 11am n all Mazzer owners welcome :)


Bummer, so when you disconnected the pipe from the sensor, you could blow down it with ease? Sorry for the last minute detail, but the oil vapour (if congealed) in the inlet manifold could still cause a restriction in the casting on the manifold.
10/5/2011 13:18:28  

Posts: 76
Since: 16/5/2009
Status: offline 		Hey buddy, Yeah was with ease, As I'll try n put pics up soon, but I've rebuilt top of engine recently and all new plenum cam covers etc so all lovely And clean under the hood , but will update on new Sensors tommoro :)
10/5/2011 14:25:13  

Posts: 7
Since: 27/4/2011
Region: Auckland
Status: offline 		Nice! Looking foward to seeing that.
11/5/2011 10:17:42  

Posts: 76
Since: 16/5/2009
Status: offline 		Ok, parts here tommorow so will update then, as had to specially order One sensor
13/5/2011 23:29:49  

Posts: 76
Since: 16/5/2009
Status: offline 		Ok, well parts arrived Out both in, Coolant sensor decides to snap after two turns, so luckily new replacement sent for Friday Put it in today, started car and - fail exactly the same, So trying a map sensor n possibly fuel reg if no joy:(
14/5/2011 20:19:46  

Posts: 7
Since: 27/4/2011
Region: Auckland
Status: offline 		Sensor snapping was a pain. 
Can you borrow a MAP sensor to test?

< Message edited by 96GhibliGT -- 14/5/2011 20:43:17 >
14/5/2011 20:59:10  

Posts: 76
Since: 16/5/2009
Status: offline 		Well I have put new fuel regulator in, and luckily a friend at emblem Myles, is sending me a map sensor to try mon/Tuesday ! So I'm hoping for it to work! As now have a spare Working 6month old fuel regulator Brand new shamal / Evo fuel pump and my Coolant sensor Air sensor So, if anyone needs any of above do let me know! As all working , will put in for sale bit when have time!
17/5/2011 9:12:49  
 

Posts: 3
Since: 17/5/2011
Status: offline 		I'll give it a good look tommorow and see if makes difference
22/5/2011 12:24:49  
 

Posts: 139
Since: 15/2/2009
Status: offline 		It could be a fuel injector which is causing the over fuelling.
Duncan
24/5/2011 16:31:58  

Posts: 76
Since: 16/5/2009
Status: offline 		Missed post! And moron above you doesn't aid matters . I've tested all injectors, taken all plugs out, recleaned, then started up again. All that happens, is 2/2.5k revs then waivers around 1k then dies. Take out plugs and all equally coked. Take out fuel pump fuse and runs fine till runs out of fuel. So, got engine in bits, putting new gasket on plenum, and going to hopefully Friday, test running with new ecu and throttle sensor as process of elimination. If not solved.... Box of matches and petrol!!
26/5/2011 16:40:06  

Posts: 228
Since: 4/5/2010
Status: offline 		Hey,

I'm not sure that was necessary...
26/5/2011 17:26:49  

Posts: 76
Since: 16/5/2009
Status: offline 		Duncan/ zam, I can assure you both the moron bit was not towards yourselves. As both been v helpful. I am however, with cars engine in a lot of pieces and 3 weeks off the road and missing car meets and shows, In the mood for someone saying by them looking at it, will help. As no idea of whom they are nor where live, so it's not appreciated. Otherwise I'm fine. But I wouldn't wish to offend either any good members nor those of site. I'm just a little anxious regarding my cars I'll health. Regards Marc
5/6/2011 8:03:46  
 

Posts: 139
Since: 15/2/2009
Status: offline 		Marc,

One possible cause of overfuelling can be incorrect camshaft timing. Maybe the belt has slipped by one tooth.

Duncan
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