Discussion
Hi, I’m new on here, 1st post!
I have a vxr8, 6.0 LS2 which is a 6 speed manual. It’s registered here as an 08 car but manufactured 07.
I’ve had the car since jan 20 and it’s just tipped over 80k.
The car has a wortec bi modal, sports cats, induction and I believe a map.
In the last month or so I have found that once the engine is warm, it starts to hold revs.
By this I mean as you stop at a junction it will climb to about 1400revs, and after about 1-3 seconds steadily drop back to normal. The same when I pull up in a car park. It’s annoying as it’s already quite a loud car and I feel that people may think I’m deliberately giving it an additional rev.
I initially wondered if the car has an EGR valve, similar to the 90’s Vauxhall ecotec engines that seemed to have similar issues. My local mechanic had looked and said no egr valve.
I’m sure I’ve since read that it could be a vacuum leak that could cause this?
I’m not a mechanic by any means and hoped someone on here could shed a bit of light on the problem.
If it were vacuum related is there a part/ area prone to look at first?
I’m based in Derbyshire and it’s my daily driver so I’m reluctant to be taking it to the likes of Walkinshaw or mws
Many thanks
Sean
I have a vxr8, 6.0 LS2 which is a 6 speed manual. It’s registered here as an 08 car but manufactured 07.
I’ve had the car since jan 20 and it’s just tipped over 80k.
The car has a wortec bi modal, sports cats, induction and I believe a map.
In the last month or so I have found that once the engine is warm, it starts to hold revs.
By this I mean as you stop at a junction it will climb to about 1400revs, and after about 1-3 seconds steadily drop back to normal. The same when I pull up in a car park. It’s annoying as it’s already quite a loud car and I feel that people may think I’m deliberately giving it an additional rev.
I initially wondered if the car has an EGR valve, similar to the 90’s Vauxhall ecotec engines that seemed to have similar issues. My local mechanic had looked and said no egr valve.
I’m sure I’ve since read that it could be a vacuum leak that could cause this?
I’m not a mechanic by any means and hoped someone on here could shed a bit of light on the problem.
If it were vacuum related is there a part/ area prone to look at first?
I’m based in Derbyshire and it’s my daily driver so I’m reluctant to be taking it to the likes of Walkinshaw or mws
Many thanks
Sean
Forgive me if I'm way off, but just a thought. Does your alternator seem to be working ok, have you any battery issues?
I only ask, because not long ago my Astra diesel idle was higher than normal. Not always, be got noticeable more frequent.
Turned out my alternator was on the blink, sometimes charging, sometimes not, allowing the battery to drop right off and then when the alternator was working again it was working much harder requiring the engine idle to rise.
I went a few weeks before the battery one day didn't have enough juice to start the car, that's when I looked at it and found intermittent charging. New alternator fitted, all back to normal.
I only ask, because not long ago my Astra diesel idle was higher than normal. Not always, be got noticeable more frequent.
Turned out my alternator was on the blink, sometimes charging, sometimes not, allowing the battery to drop right off and then when the alternator was working again it was working much harder requiring the engine idle to rise.
I went a few weeks before the battery one day didn't have enough juice to start the car, that's when I looked at it and found intermittent charging. New alternator fitted, all back to normal.
Hi thanks for the reply. My cars been doing it now for what must be a couple of months, very intermittent, it can do it 3-4 times one after another as I stop, then it will be fine again?
Re alternator I did a test on it also around a couple of months ago as someone suggested possible low battery re another niggle that I had with the car. When tested back then it was fine
Re alternator I did a test on it also around a couple of months ago as someone suggested possible low battery re another niggle that I had with the car. When tested back then it was fine
Thanks for that reply, certainly wasn’t aware of throttle body issues? Was that an issue Over a certain period? Eg, cars manufactured between say, may 07-nov 07? Or is there another way to identify if mine could be a troubled one?
Re the scan, I’ve had this done now 8 or 9 times since ownership. This was due to engine management light coming on the day after I bought it. It was showing that the issue was O2 sensor related, something which my mechanic has said is down to them not reading properly because of the sports cats.
The other issue I’d had was stability control coming on/ off, sometimes staying on for days then going out all by itself. I thought we’d resolved this when both rear abs sensor were showing a fault and were replaced. When I spoke to MWS they said very rarely the piece of loom connecting them that runs across the back axel can suffer broken wires. As yet that had t been replaced, I’ve just put up with the annoying “ bing bong” when it chimes to let you know.
Someone had previously suggested low/weak battery can trigger all sorts or weird faults ?
Like I’ve mentioned the battery was fully tested no load/ full load and gave good readings.
Tbh I’ve got to the point of ignoring the engine management light, as every time there’s no loss of power or performance and each and every time it’s been on the scanner it’s shown the same O2 sensor. I’m not keep chucking £20 per scan un necessarily
How it the throttle body cleaned? Presumably emptying a can of carb cleaner down it??
Sorry for long reply, but I thought I may as well say everything that’s been done checked. Love the car to bits, just annoying electronic niggles
Sean
Re the scan, I’ve had this done now 8 or 9 times since ownership. This was due to engine management light coming on the day after I bought it. It was showing that the issue was O2 sensor related, something which my mechanic has said is down to them not reading properly because of the sports cats.
The other issue I’d had was stability control coming on/ off, sometimes staying on for days then going out all by itself. I thought we’d resolved this when both rear abs sensor were showing a fault and were replaced. When I spoke to MWS they said very rarely the piece of loom connecting them that runs across the back axel can suffer broken wires. As yet that had t been replaced, I’ve just put up with the annoying “ bing bong” when it chimes to let you know.
Someone had previously suggested low/weak battery can trigger all sorts or weird faults ?
Like I’ve mentioned the battery was fully tested no load/ full load and gave good readings.
Tbh I’ve got to the point of ignoring the engine management light, as every time there’s no loss of power or performance and each and every time it’s been on the scanner it’s shown the same O2 sensor. I’m not keep chucking £20 per scan un necessarily
How it the throttle body cleaned? Presumably emptying a can of carb cleaner down it??
Sorry for long reply, but I thought I may as well say everything that’s been done checked. Love the car to bits, just annoying electronic niggles
Sean
A poor battery will mess things up , throttle body is a sometimes issue , they can be bought from rock auto in the states but always use fed ex to ship so the price you pay when you order is all you pay , clean out throttle body , clean or change air filter , an air leak can cause it , an 02 sensor can also cause it ? order o2 sensors from australia , the us ones are not the same they appear to work but are not often doing what they are supposed to , i went through three sets of 02 sensors until i bought decent aussi ones
Hi.
No limp mode, no loss of power etc.
Re the engine management light.
It’s just annoying how it can come on, stay on for days-week then disappear again for similar amount of time, before coming back on again.
There is something I did forget to mention regards to someone suggesting battery.
I had tested it engine off. Engine on and noted the readings . I have also tested it with all accessories on, heater, lights, heated rear window etc so is was under full load. I noted the readings and having turned all accessories off noted readings again.
According to my mechanic they are within tolerance.
Now I have had one occasion recently where I came to start the car and all I got was a “ click”
Tried again and started , not done it since. I was thinking starter motor. Mechanic has suggested could just be a 1 off glich?
I have also had 2 occasions where I’ve come to start it and there has been nothing, not even a “click”
Both times it’s started on 2nd turn off key. I did wonder if the system had not recognised the key??
Had similar on an Audi A5 I had
Strange thing every time it’s been to garage for a full scan it only ever brings up the O2 sensor /lean and more recently this one
Co899 control module power circuit and B1029 audio system fault.
I’ve no idea what these mean/ relate to. Had them cleared .
Sean
No limp mode, no loss of power etc.
Re the engine management light.
It’s just annoying how it can come on, stay on for days-week then disappear again for similar amount of time, before coming back on again.
There is something I did forget to mention regards to someone suggesting battery.
I had tested it engine off. Engine on and noted the readings . I have also tested it with all accessories on, heater, lights, heated rear window etc so is was under full load. I noted the readings and having turned all accessories off noted readings again.
According to my mechanic they are within tolerance.
Now I have had one occasion recently where I came to start the car and all I got was a “ click”
Tried again and started , not done it since. I was thinking starter motor. Mechanic has suggested could just be a 1 off glich?
I have also had 2 occasions where I’ve come to start it and there has been nothing, not even a “click”
Both times it’s started on 2nd turn off key. I did wonder if the system had not recognised the key??
Had similar on an Audi A5 I had
Strange thing every time it’s been to garage for a full scan it only ever brings up the O2 sensor /lean and more recently this one
Co899 control module power circuit and B1029 audio system fault.
I’ve no idea what these mean/ relate to. Had them cleared .
Sean
Hi.
No limp mode, no loss of power etc.
Re the engine management light.
It’s just annoying how it can come on, stay on for days-week then disappear again for similar amount of time, before coming back on again.
There is something I did forget to mention regards to someone suggesting battery.
I had tested it engine off. Engine on and noted the readings . I have also tested it with all accessories on, heater, lights, heated rear window etc so is was under full load. I noted the readings and having turned all accessories off noted readings again.
According to my mechanic they are within tolerance.
Now I have had one occasion recently where I came to start the car and all I got was a “ click”
Tried again and started , not done it since. I was thinking starter motor. Mechanic has suggested could just be a 1 off glich?
I have also had 2 occasions where I’ve come to start it and there has been nothing, not even a “click”
Both times it’s started on 2nd turn off key. I did wonder if the system had not recognised the key??
Had similar on an Audi A5 I had
Strange thing every time it’s been to garage for a full scan it only ever brings up the O2 sensor /lean and more recently this one
Co899 control module power circuit and B1029 Audio system fault
No limp mode, no loss of power etc.
Re the engine management light.
It’s just annoying how it can come on, stay on for days-week then disappear again for similar amount of time, before coming back on again.
There is something I did forget to mention regards to someone suggesting battery.
I had tested it engine off. Engine on and noted the readings . I have also tested it with all accessories on, heater, lights, heated rear window etc so is was under full load. I noted the readings and having turned all accessories off noted readings again.
According to my mechanic they are within tolerance.
Now I have had one occasion recently where I came to start the car and all I got was a “ click”
Tried again and started , not done it since. I was thinking starter motor. Mechanic has suggested could just be a 1 off glich?
I have also had 2 occasions where I’ve come to start it and there has been nothing, not even a “click”
Both times it’s started on 2nd turn off key. I did wonder if the system had not recognised the key??
Had similar on an Audi A5 I had
Strange thing every time it’s been to garage for a full scan it only ever brings up the O2 sensor /lean and more recently this one
Co899 control module power circuit and B1029 Audio system fault
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