Lightning Coupé
Senior Member
markv said:Lightning Coupé said:Wasnt sure weather to go with the 2.4l throttle body as I'm worried it wont work as in markv's case? But i've gone ahead anyway, seems daft not to as it should make combined postage cheaper? I'm just hoping that the problems mark is getting is down to the nethelands strict emissions control in the ecu or because he has standard cams? I dunno but I cant see why a 68mm sc throttle would work and not the same 68mm 2.4l unit? dunno.. fingers crossed hey![]()
No, it is not a Dutch emissions thing. The ECU has a table which has the throttle position and how much air pressure to expect in the manifold for that position. It will compare that to the actual measured pressure in the manifold by the MAP sensor. If they differ more then 30kPa, it will log the P1514.
So if you have better flow then my engine (by fitting cams, flowed head, bigger valves, wasted stem valves, exhaust manifold) the pressure difference will be less. As long as it is within this tollerance you should not see P1514.
The problem is though, that we know with Vocky's state of tune it isn't a problem, but we don't know where the crossover point is.
Mark
Thanks mark, that description helps clear the issue up. I may have a snippet of info that resolves the matter further. Ffoeg, registered on this forum but mainly a user of www.astrasport.co.uk has a 68mm throttle body on the standard 2.2 manifold and piper cams, and as far as i'm aware he had no problems. Hopefully he will read this thread and confirm this in due corse, but the cross over point in this case would seem to be the addition of cams alone! Which depending how you look at it is good news! hopefully! As I have piper cams fitted, I should be ok and will let you know just as soon as its all fitted.