Discussion
Hi all, seem to have a strange intermitant problem with my Noble GTO-3R.
When cruising at approx 100mph, then accelerating, i get a flatness in the power increase, its difficult to explain but it feels although the engine isnt engaging with full power....this has happened 2 or 3 times now, its been to MV but typically it didnt do it when they test drove the car.
Has anyone got any suggestions on what may be causing this?
Thanks.
Ben
When cruising at approx 100mph, then accelerating, i get a flatness in the power increase, its difficult to explain but it feels although the engine isnt engaging with full power....this has happened 2 or 3 times now, its been to MV but typically it didnt do it when they test drove the car.
Has anyone got any suggestions on what may be causing this?
Thanks.
Ben
Ben - does this occur only when the engine has been driven hard and is hot? (Possibly why not picked up by MV -'cos it will pull fine during 'normal' road driving). Did MV check out the cats and lambda sensor?If they're OK give Bob Shape at Noble a ring. May need re-mapping (with a new map recently devised by Yellowshed I believe)
Problems always hide when you need to demonstrate them, but then re-apear at the most undesirable times!
I spent 15 minutes showing a technician the rattle in my exhaust that would happen EVERY time I hit 4000rpm. Did it do it? NO!
In the end I just started driving how I usually did to make the problem apear. The poor guy wouldn't let go of the grab handle.
Anyway, I find the best thing to do is make sure the car is doing the problem right before you visit the dealer. Heat does sound like the most likely cause though, so have a blast before you get there, try and re-create the problem, then grab one of the MV guys and do it again.
Good luck.
I spent 15 minutes showing a technician the rattle in my exhaust that would happen EVERY time I hit 4000rpm. Did it do it? NO!
In the end I just started driving how I usually did to make the problem apear. The poor guy wouldn't let go of the grab handle.
Anyway, I find the best thing to do is make sure the car is doing the problem right before you visit the dealer. Heat does sound like the most likely cause though, so have a blast before you get there, try and re-create the problem, then grab one of the MV guys and do it again.
Good luck.
What sort of fuel are you using - 98RON optimax ?
I've experienced this sort of thing in the past on other cars. At the 100mph sort of speeds, when you floor it the boost would come in damn hard (overboost city !) and the ignition timings would definitely be changing (advanced ?) to give you optimal power. This is the ideal time for the ECU to detect either pinking/pre-ignition or serious overboost and perhaps cut back the ignition advance and boost to save the engine (you feel the dip in power). I'm certainly no expert on the noble ECU's and am talking from a more general point of view, but perhaps when you turn-off the car the ECU resets the limits - until they are again exceeded and the safety limits kick in again. You get to the dealer - turn off the car - ECU resets - no problem until you're steaming down the M4 and give it some serious welly. I wonder if the ECU would keep a history of such pinking events ?
Probably something completely different though
I've experienced this sort of thing in the past on other cars. At the 100mph sort of speeds, when you floor it the boost would come in damn hard (overboost city !) and the ignition timings would definitely be changing (advanced ?) to give you optimal power. This is the ideal time for the ECU to detect either pinking/pre-ignition or serious overboost and perhaps cut back the ignition advance and boost to save the engine (you feel the dip in power). I'm certainly no expert on the noble ECU's and am talking from a more general point of view, but perhaps when you turn-off the car the ECU resets the limits - until they are again exceeded and the safety limits kick in again. You get to the dealer - turn off the car - ECU resets - no problem until you're steaming down the M4 and give it some serious welly. I wonder if the ECU would keep a history of such pinking events ?
Probably something completely different though
capelink said:
What sort of fuel are you using - 98RON optimax ?
I've experienced this sort of thing in the past on other cars. At the 100mph sort of speeds, when you floor it the boost would come in damn hard (overboost city !) and the ignition timings would definitely be changing (advanced ?) to give you optimal power. This is the ideal time for the ECU to detect either pinking/pre-ignition or serious overboost and perhaps cut back the ignition advance and boost to save the engine (you feel the dip in power). I'm certainly no expert on the noble ECU's and am talking from a more general point of view, but perhaps when you turn-off the car the ECU resets the limits - until they are again exceeded and the safety limits kick in again. You get to the dealer - turn off the car - ECU resets - no problem until you're steaming down the M4 and give it some serious welly. I wonder if the ECU would keep a history of such pinking events ?
Probably something completely different though
Don't think there's a knock sensor on the cars.
Q: When you feel the lack of power do you ease up, then try again? What happens then?
smuudge said:
Hi all, seem to have a strange intermitant problem with my Noble GTO-3R.
When cruising at approx 100mph, then accelerating, i get a flatness in the power increase, its difficult to explain but it feels although the engine isnt engaging with full power....this has happened 2 or 3 times now, its been to MV but typically it didnt do it when they test drove the car.
Has anyone got any suggestions on what may be causing this?
Thanks.
Ben
I had very similar symptoms to this. Problem was resolved by VegantuneRoush. I believe it was fueling problem and some ECU mods sorted it out..........
Ben,
Just get the ECU checked to see if it's on the latest map - sounds like one of the normal map artifacts that some people have suffered from over the time that have been weedled out.
Apart from that, get the lamda sensor and any air leaks checked - they send the ECU a little bit "mad" if they have them.
J
Just get the ECU checked to see if it's on the latest map - sounds like one of the normal map artifacts that some people have suffered from over the time that have been weedled out.
Apart from that, get the lamda sensor and any air leaks checked - they send the ECU a little bit "mad" if they have them.
J
YellowShed said:
Feel free to drop in to Roush - 5 miles from Jcn 28 of the M25 so a lot nearer than the factory for someone in Kent - and we'll give the ECU a once over FOC. If there's anything more involved, we can talk about it then.
I really must try to drop by one day. I feel almost embarrassed that I live 3 miles down the road and I've never had the pleasure. I've been passed in the last couple of days as well. I'm sure that 30MPH zone runs out on purpose just before the railway bridge
Regards
Phil
Hi Guys, many thanks for all the replies. For your info the ECU has allready been remapped only a few weeks ago, and MV or almost 100% certain that isnt the problem, although they will happilly look at it again if the problem persists.
The car was test driven over 25 miles and they couldnt spot any problems, in fact they were impressed how smooth the car was compared to some others that come in for a once over!
Basically im out in it over the weekend with a mate to hopefully take down some vital stats if we can get the problem to rear its ugly head.
In the meantime if anyone has any other thoughts on the problem then please let me know....this topic will be printed out and making its way to MV with me the next time im passing!
Cheers again
Ben
The car was test driven over 25 miles and they couldnt spot any problems, in fact they were impressed how smooth the car was compared to some others that come in for a once over!
Basically im out in it over the weekend with a mate to hopefully take down some vital stats if we can get the problem to rear its ugly head.
In the meantime if anyone has any other thoughts on the problem then please let me know....this topic will be printed out and making its way to MV with me the next time im passing!
Cheers again
Ben
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