Cold Start Up

Lozzer

Member
Messages
2,280
When was the TB done? Heard of corroded magnets and such like. I looked at this as mine has been converted already, Maserati Shed will not entertain a TB that has already been converted because they "don't want to be associated with other peoples bodges" which is fine, but there are no records of which cars (including the shed) have been done as far as I can tell, I find that stance all a bit 5hit really.
 

alfatwo

Member
Messages
5,517
When was the TB done? Heard of corroded magnets and such like. I looked at this as mine has been converted already, Maserati Shed will not entertain a TB that has already been converted because they "don't want to be associated with other peoples bodges" which is fine, but there are no records of which cars (including the shed) have been done as far as I can tell, I find that stance all a bit 5hit really.

I don't want to cause a storm, but David Askew says he's had quite a few Maserati Shed throttle body come backs he's had the deal with over the years!

Dave
 

davy83

Member
Messages
2,809
This seems like TB problem, but you should check the pedal sensor is stable, by verifying that the pedal sensor voltage outputs are the same at idle when the engine is speeding up. If the sensor output is the same regardless of the actual idle rpm then the problem is not the pedal sensor. This seems to be a problem with the position sensors giving errors or the throttle butterfly sticking slightly open, and you get a small amount of throttle so the revs go up. I would get the TB stripped and cleaned up, I had my TB done by Xmodex in Canada and the unit was first class when I got it back.

T.B done Maserati shed, battery off 2 hrs, throttle reset, start & tick over know 12-1500rpm then slowly picks up speed as it gets warm, out of drive & tick over rises to 2-3000rpm.
 

wink

Junior Member
Messages
85
I don't want to cause a storm, but David Askew says he's had quite a few Maserati Shed throttle body come backs he's had the deal with over the years!

Dave
With all the original throttle bodies having problems eventually, there are hundreds of refurbs out there, from several sources, and some of them will inevitably suffer further trouble. I've heard good and bad about pretty much all of the various specialists. They all have the needle with each other and there are always stories floating about regarding other folks' workmanship. Doesn't only happen here - it's absolutely typical of every specialist car/bike/model train (enter category here) forum. IMO it's best for all of us owners to keep out of the spats that go on and try not to fuel them. Whoever you trust with your car, stick with them unless you have a genuine reason to go elsewhere.
 

Lusso916

Junior Member
Messages
78
Just to close my problem, it was a small rubber air pipe between the engine and bulk head that had split as it fits over a steel pipe causing a loss of vacuum and intake of to much air.
Thanks to all for your ideas and help.
 

Lozzer

Member
Messages
2,280
My car does this occasionally, and indeed if you shut it down and start it again its fine, not errors and no weird driving behaviour. I have noticed pedal sensor calibration affects this some times, but its hard to get the car to do it twice without changing anything so its really hard to tell if you have fixed it. I suspect its the early stages of a sticking throttle body. I have been ignoring this for some time, i also notice if its not been driven its more likely to do this, which also adds to my thought that its the Throttle body sticking. I decided the cure is clearly to drive it more :)

Just an update on this, when I start her up now when hot , she will idle around 1800, if I give her some pedal to say 2200 she will stay there, all points to TB? Binding magnets? (has a sacer cap on already)
Cheers
Loz
 

alfatwo

Member
Messages
5,517
Loz, The only way the engine will idle at those revs is with an air leak, be it from poor manifold sealing or the throttle body sticking slightly open

Do you have anyone close you could swap a throttle body with a known good one..it only takes a few minutes..


Dave
 

Lozzer

Member
Messages
2,280
Loz, The only way the engine will idle at those revs is with an air leak, be it from poor manifold sealing or the throttle body sticking slightly open

Do you have anyone close you could swap a throttle body with a known good one..it only takes a few minutes..


Dave

Hi Dave, unfortunately not regarding the TB around here, it's not a major issue at the minute, but I would like to rule one or the other out. Eurospares are doing a special on the TB ATM, but I would like to know for sure first. I am willing to travel if anyone has a good one to try though!
 

Kincath

Member
Messages
358
You could try a leak test if you have access to a smoke machine. Brilliant bit of kit. Takes two min to set up and feeds artificial smoke through the full engine and intake system and identity's any leaks in pipework etc...
 

alfatwo

Member
Messages
5,517
You could try a leak test if you have access to a smoke machine. Brilliant bit of kit. Takes two min to set up and feeds artificial smoke through the full engine and intake system and identity's any leaks in pipework etc...

Now that's clever!


Dave
 

Lozzer

Member
Messages
2,280
A quick check today and she has stored 2 obd codes, p0225 and p1225 , no cel though.
Cheers
Loz

Edit, ignore that, historical and caused by myself most likely , my memory must be going!
 

Lozzer

Member
Messages
2,280
Took a trip down to see DA last week, I can't speak highly enough of his service and willingness to help, very nice chap indeed, gave my tb a clean bill of health so I can now rule that out, next step was to pull the manifold and replace o rings and underbelly gasket, Anyone know what size the o rings are or have a sample one to measure? Materials have evolved a lot in the last 20yr.
Thanks
Loz
 

alfatwo

Member
Messages
5,517
Took a trip down to see DA last week, I can't speak highly enough of his service and willingness to help, very nice chap indeed, gave my tb a clean bill of health so I can now rule that out, next step was to pull the manifold and replace o rings and underbelly gasket, Anyone know what size the o rings are or have a sample one to measure? Materials have evolved a lot in the last 20yr.
Thanks
Loz

Loz, there not actually o rings, there seals size specific to the inlet manifold

If you had roll of the stuff you could cut it to length and fix the ends with super glue.. come to think of it DA has a roll of the stuff he calls rubber string!


Dave
 

Lozzer

Member
Messages
2,280
Loz, there not actually o rings, there seals size specific to the inlet manifold

If you had roll of the stuff you could cut it to length and fix the ends with super glue.. come to think of it DA has a roll of the stuff he calls rubber string!


Dave

Is that true? You will be sending me for a spirit level bubble next!
 

Lozzer

Member
Messages
2,280
Another update lol, been for a smoke test which confirmed a slight leak under the manifold, nothing major, manifold off and resealed along with new o rings and smoke tested again along with all systems reset to confirm everything being hunky dory. Still the same though, along with a pulsing idle and a hanging hot start of around 1800/2000rpm, not that I mind but it gets a bit embarrassing in the petrol station lol
Cheers
Loz
 

Lozzer

Member
Messages
2,280
So I bought one of those WiFi gizmos in able to see if anything untoward was happening, now the 02 sensor voltages, is this a normal reading? One seems to be quite active, the other giving low reading?
Thanks
Loz
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