Occasional popping coming from o/s tail pipe
Discussion
As described.
On tick over speed six Tamora pops from right hand side exhaust pipe. Regularly.
Any ideas so I don’t blow it up.
Thanks.
ETA whilst driving it on the power and overrun it feels fine so if it’s misfiring it might have even more power I’d like to find.
On tick over speed six Tamora pops from right hand side exhaust pipe. Regularly.
Any ideas so I don’t blow it up.
Thanks.
ETA whilst driving it on the power and overrun it feels fine so if it’s misfiring it might have even more power I’d like to find.
Edited by Classic Chim on Monday 18th March 14:30
The Three D Mucketeer said:
Is it on a std. ECU mapping or bespoke ? Has it got cats or not ? Who services it ? What fuel are you using ?
LucyP says it's about to blow up and needs a rebuild
Super unleaded and I have not got its history. LucyP says it's about to blow up and needs a rebuild
Don’t know where ecu is and at the moment assume it’s on a standard set up. Is that Mbe.
It sounds like it’s mis firing or fuel in the exhaust igniting.
but responds to throttle eagerly and sounds great otherwise.
Does it have one or two lambda fitted.
Do you need certain hardware and software to read fault codes or can you do it all from the buttons behind steering wheel. An anyone link me to those sequences please.
Two lambdas for each bank ...I think.... I'm no expert , i take it to men who are either Heath/Paul Xworks or Dom/(used to be Jason) at Powers
You need a serial cable to a 3 pin connector (flat not round like a Chim Lucas connector) on the original MBE ECU , its drivers side under the steering column ... I've upgraded to the newer MBE ECU so its a USB -CAN interface , the CAN interface is passenger side glove box area (well on my Tuscan Vert it is).
The ECU is located passenger side footwell IIRC ...
Dom/Jason did my bespoke mapping on their rolling road to get optimum fueling ... and as many pops and bangs as the customer wanted
You need a serial cable to a 3 pin connector (flat not round like a Chim Lucas connector) on the original MBE ECU , its drivers side under the steering column ... I've upgraded to the newer MBE ECU so its a USB -CAN interface , the CAN interface is passenger side glove box area (well on my Tuscan Vert it is).
The ECU is located passenger side footwell IIRC ...
Dom/Jason did my bespoke mapping on their rolling road to get optimum fueling ... and as many pops and bangs as the customer wanted
Just sounds like mis balanced throttle on one bank. The adjustment is easy enough, loads on here about how to but the linkage is a right old faff.
To explain there are six throttle bodies, the cable enters centrally and operates one shaft on one throttle body, this is linked via an adjustable linkage to the adjacent trio, each operating the next in turn by an adjustable linkage, the other two of the six are linked in much the same manner via the shaft of the "first" operated. The throttle potentiometers are at either end of the line. All these linkages are so "crap" that they go out of adjustment more frequently than my wife tells me to stop buying cars.
If you have one open more than the others the idle speed will probably not change much but the amount of air (O) entering will increase in this one cylinder, there are only two lambdas, one per three cylinders, so you can easily get a lean situation, or rich, if these critters are half a turn out as the lambdas are trimming on an average. When you go gassing it the imbalance between nearly closed throttle plates to nearly full open ones disappears, so it runs OK.
Ideally you need to get these balanced soonest. The adaptive map will reset as the lambdas trim but a lot of people like to reset the maps.
To explain there are six throttle bodies, the cable enters centrally and operates one shaft on one throttle body, this is linked via an adjustable linkage to the adjacent trio, each operating the next in turn by an adjustable linkage, the other two of the six are linked in much the same manner via the shaft of the "first" operated. The throttle potentiometers are at either end of the line. All these linkages are so "crap" that they go out of adjustment more frequently than my wife tells me to stop buying cars.
If you have one open more than the others the idle speed will probably not change much but the amount of air (O) entering will increase in this one cylinder, there are only two lambdas, one per three cylinders, so you can easily get a lean situation, or rich, if these critters are half a turn out as the lambdas are trimming on an average. When you go gassing it the imbalance between nearly closed throttle plates to nearly full open ones disappears, so it runs OK.
Ideally you need to get these balanced soonest. The adaptive map will reset as the lambdas trim but a lot of people like to reset the maps.
I agree, sounds like out of balance TB and an easy item to ressolve. Might be worn TB bushes if they go out of balance quickly.
If the car is decatted it will pop and bang on the standard map - even with a standard back box.
So I would start with a TB balance. If they don't have the TVR software then there is the AJP for Android that was done by a PH member. There's a thread in this forum somewhere. Just need an andorid phone / tablet and the right [weird] cable.
If the car is decatted it will pop and bang on the standard map - even with a standard back box.
So I would start with a TB balance. If they don't have the TVR software then there is the AJP for Android that was done by a PH member. There's a thread in this forum somewhere. Just need an andorid phone / tablet and the right [weird] cable.
Software is for free and runs on mostly all systems, see here https://www.pistonheads.com/gassing/topic.asp?h=0&....
You need to connect the car, which requires an weird-plug-to-USB-connection. Further details under the link above.
You need to connect the car, which requires an weird-plug-to-USB-connection. Further details under the link above.
Alun,
Firstly, MBE ECU is located in driver's footwell. There's other (TVR) ECUs down there too.
Sometimes, the ECU benefits from releasing the 3 multiplugs and re-making...possibly with some contact spray..
Wet feet - wet carpets can cause poor contacts on the ECU pins.
If you want to check airflow through throttle bodies, you will need a syncrometer. The idea is to get a flow across all 6 throttles of around 6l/sec using the grub screw adjustment at idle rpm. It's a bit of a faff!
To really see what's happening you do need the software from EvoOli (Here on PH Speed6 forum) and the connection lead from the ECU 3-pin plug under the dash to a USB plug to the laptop.
Nick
Firstly, MBE ECU is located in driver's footwell. There's other (TVR) ECUs down there too.
Sometimes, the ECU benefits from releasing the 3 multiplugs and re-making...possibly with some contact spray..
Wet feet - wet carpets can cause poor contacts on the ECU pins.
If you want to check airflow through throttle bodies, you will need a syncrometer. The idea is to get a flow across all 6 throttles of around 6l/sec using the grub screw adjustment at idle rpm. It's a bit of a faff!
To really see what's happening you do need the software from EvoOli (Here on PH Speed6 forum) and the connection lead from the ECU 3-pin plug under the dash to a USB plug to the laptop.
Nick
Without the service history to look at, I would change the Nvram chip as a first thing so that the car retains the adaptives. If the car is 20 years old by now it should of had two replacements (IF it has been jump started then more, as simply turning the ingition on with a flat battery it will see the 3 volt battery in the Nvram and rob it on any voltage). A@
Edited by Adrian@ on Wednesday 20th March 12:07
Nothings easy is it 
I’ll take all this information and discuss it with the mechanics at work as they are the ones that really need to know although it would be nice to help set up the throttle bodies
I think they’ll find the advice on here indispensable.
How would I check for wear in the throttle body bushes. Is it obvious and would gently manipulating the linkages show loose or free play in those bushes or is it a more subtle affair.
It’s very exciting getting my hands on this speed six powered Tvr.
I’m still stoked every driver of the general public who came to drive it totally fell for it. That’s actually very rare.
What a car
I’ll take all this information and discuss it with the mechanics at work as they are the ones that really need to know although it would be nice to help set up the throttle bodies
I think they’ll find the advice on here indispensable.
How would I check for wear in the throttle body bushes. Is it obvious and would gently manipulating the linkages show loose or free play in those bushes or is it a more subtle affair.
It’s very exciting getting my hands on this speed six powered Tvr.
I’m still stoked every driver of the general public who came to drive it totally fell for it. That’s actually very rare.
What a car
Granturadriver said:
Software is for free and runs on mostly all systems, see here https://www.pistonheads.com/gassing/topic.asp?h=0&....
You need to connect the car, which requires an weird-plug-to-USB-connection. Further details under the link above.
Thanks for the link. You need to connect the car, which requires an weird-plug-to-USB-connection. Further details under the link above.
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