Discussion
I know this has been mentioned before but I seem to have a dilema. My cerb is decatted/sports exhaust and is running really bad at the mid to top end. Meaning no excelleration. Thinking it might be the cats I put the original ones back on and guess what, the problem is still the same. Does anyone have any ideas. I know people say re-mapping is the answer but I dont want to spend £*** at the mo. Surely it should run fine enough without it. Max speed is 150mph flat out. mmmmmm!!
This might sound like a stupid question but have you taken it to a dealer to get it checked over?
I would not have thought the cats would have made much difference to the running, they do not on mine.
I think you can partly reset the ECU by removing the power (either the main battery or directly from the ECU) for an hour or so. This might be worth a try (it is free and easy and should not make it worse).
On other cars, when they have had trouble with mid to high end it has usually turned out to be electical, how old are your HT leads?
Good luck!
D
I would not have thought the cats would have made much difference to the running, they do not on mine.
I think you can partly reset the ECU by removing the power (either the main battery or directly from the ECU) for an hour or so. This might be worth a try (it is free and easy and should not make it worse).
On other cars, when they have had trouble with mid to high end it has usually turned out to be electical, how old are your HT leads?
Good luck!
D
I would also recommend getting it checked out at a dealer. I recently had a similar problem with my Cerb, whereby I noticed a significant drop in power which I thought had been caused by water in the engine after I went through a large flood puddle. Turned out there was no water in the engine (thankfully), but when the laptop was plugged in it showed a whole bunch of ECU errors (thus upsetting the mixture). The dealer cleared them, test drove the car, stuck the laptop back on and they were gone. The ECU somehow got itself confused, and the car is now running sweet.
gixxer.
gixxer.
The car has been into M**** V***** for a couple of weeks. They have reset the ecu, replaced the eprom chip with a new one. They have also adjusted the throttle pots slightly above the 19% because it kept stalling. They said theycan't fix the problem with the top end. They did say that it was over fueling at the bottom end. They did a service on it when I bought it a few months ago. Would the HT leads cause that sort of problem? I love the sound, would never go back. Just want a normal cerb. Its funny cos when you put it either 2nd or 3rd and floor it, it takes about 2-3 seconds to pickup. It just goes flat as a pancake.
Seems a bit odd. I did a ride drive with the nwkent tvrcc at the weekend and it was fab. I actually outrun an earlier cerb 4.5 on the straight fairly easily going from 2nd gear upto 4th. When the power comes in it feels very quick indeed. Thrashed her all day long, drove like a dream except for the obvious flat spots and slight stalling.
Get it tested for your own piece of mind, i.e. compression test etc.
Probably nothing wrong with the engine though.
Nothing worse than when you lose confidence in the car.
If you bought it from MV get them to sort it properly, try a different ECU for example. Don't swallow this 'we can't fix it' bollocks.
If you didn't buy it from MV then get it to a good independent, I am sure plenty of people on here can advise.
Good luck
Rob.
Probably nothing wrong with the engine though.
Nothing worse than when you lose confidence in the car.
If you bought it from MV get them to sort it properly, try a different ECU for example. Don't swallow this 'we can't fix it' bollocks.
If you didn't buy it from MV then get it to a good independent, I am sure plenty of people on here can advise.
Good luck
Rob.
Yes I did get it from MV. They have blamed it on the cats all the way so far. Just run out its 3 months no quibble warranty. They are going to check the ht leads but they will give me a price. Shouldn't they have checked this the last time it went in a few weeks ago. Based on what I have learned so far, alarm bells at their service dep should have rung regarding pots, leads etc.... Now it seems its gonna cost me money.
I dont know if you chaps remember, but a while back I highlighted that a few colleagues cerberas were appalling on performance and some maxed out at 150ish....
I recently was speaking to one of them and he told me that his engine got sent in for a rebuild and it came back with all the life.
Another fella said that he had an injector problem, opening/closing issue or something, and had them sent away for sorting out.... and new she flies....
In my opinion I'd recommend you go round MV and take a big fish in your right hand, and wake them up.... de-catting a car will not lead to issues such as this.... I think you're being seen off too easily.
They're gonna eat you alive if you keep taking her back and back again and again.... Like said earlier, get her booked in with a reputable indie and get a full diagnosis.... you will find its something very simple... and most likely with the fuel/timing/electrical systems..... MV are usually very good, but sometimes they're just too busy and just like most dealers, quality of diagnosis starts to wander down their scale of usual standards.
Goodluck.
I recently was speaking to one of them and he told me that his engine got sent in for a rebuild and it came back with all the life.
Another fella said that he had an injector problem, opening/closing issue or something, and had them sent away for sorting out.... and new she flies....
In my opinion I'd recommend you go round MV and take a big fish in your right hand, and wake them up.... de-catting a car will not lead to issues such as this.... I think you're being seen off too easily.
They're gonna eat you alive if you keep taking her back and back again and again.... Like said earlier, get her booked in with a reputable indie and get a full diagnosis.... you will find its something very simple... and most likely with the fuel/timing/electrical systems..... MV are usually very good, but sometimes they're just too busy and just like most dealers, quality of diagnosis starts to wander down their scale of usual standards.
Goodluck.
Cerbie450 said:
I know this has been mentioned before but I seem to have a dilema. My cerb is decatted/sports exhaust and is running really bad at the mid to top end. Meaning no excelleration. Thinking it might be the cats I put the original ones back on and guess what, the problem is still the same. Does anyone have any ideas. I know people say re-mapping is the answer but I dont want to spend £*** at the mo. Surely it should run fine enough without it. Max speed is 150mph flat out. mmmmmm!!
Have you checked to make sure that you are getting full throttle? Check the linkage.
be aware that not every dealer has the knowledge to set the V8 up correctly. I assume they have checked /replaced the plugs?
Scanning through the posts, and ignoring everything written so far as I'm tired... 
I'd check, in this order:
o HT Leads
o Switch the ECU with somebody else's
o Lambda sensors(??)
You are running it on Optimax, yeah?
If you have a 3 month no-quibble warranty and raise the issue before the 3 months is up, it's irrelevant if it's fixed before then. It's their responsibility to sort the problem out. Don't take any crap from a dealer over this - you paid a premium for a service, and anyone thinking they can get away by fobbing you off until a warranty expires is garbage. You've already had the car back in for the problem, so it's not like it went unnoticed.
150mph is an appalling top speed. When doing the home -> work trip late on every Sunday night, I'd regularly go from 100 -> 160+ down the 100 miles of private road.
The engine never felt laboured at all; it pulled hard all the way, and mine was certainly not one of the most powerful.
Oh, and 4.5s are also known for having noticeably worse flat-spots than 4.2s, as far as I know.
I'd check, in this order:
o HT Leads
o Switch the ECU with somebody else's
o Lambda sensors(??)
You are running it on Optimax, yeah?
If you have a 3 month no-quibble warranty and raise the issue before the 3 months is up, it's irrelevant if it's fixed before then. It's their responsibility to sort the problem out. Don't take any crap from a dealer over this - you paid a premium for a service, and anyone thinking they can get away by fobbing you off until a warranty expires is garbage. You've already had the car back in for the problem, so it's not like it went unnoticed.
150mph is an appalling top speed. When doing the home -> work trip late on every Sunday night, I'd regularly go from 100 -> 160+ down the 100 miles of private road.
The engine never felt laboured at all; it pulled hard all the way, and mine was certainly not one of the most powerful. Oh, and 4.5s are also known for having noticeably worse flat-spots than 4.2s, as far as I know.
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