General Anyone had this fault ?

[pasotibbs]

Cinq Sporting will rev to approx 6000rpm when cool but as the engine warms the "rev limit" drops to approx 5000rpm and when fully warm 4000rpm !
It runs ok below 4000rpm but just won't rev higher (no drama it just stops at 4000),this is loaded or unloaded.
Swapped Lambda,MAP sensor and ECU with no change(all S/H)

Any ideas ?

 

[arc]

if its temperature based, i would've looked at the temperature sensors first. Specifically the coolant temperature sensor.

is the injector light coming on when it won't rev?

 

[fingers99]

That, and check the MAP hose.

How cool is cool? You shouldn't be reving the engine to 6k with less that 70C on the clock.

 

[pasotibbs]

No warning light or any loss of power it just won't rev above 4k when at normal temp.
I also think the temp sensor is a possible cause, it is next on my list to try (I already had the other parts so tried them first)

 

[pasotibbs]

MAP Hose appears ok, I don't normally rev a cool engine but as an experiment I let it rev higher than normal in second gear on light throttle load (I drove it 2 miles to a national speed limit road,so it was cool rather than cold- but not ideal I agree)

 

[pingu]

try the crank sensor. try 2 clean it. both ends the plug and sensor. if not try and get a replacment. good look.

 

[pasotibbs]

I replaced the ECU water temp sensor (new) but the fault remains, will try the crank sensor next!

 

[chaos]

Have you tested the MAP sensor pipe? Just because it looks OK doesn't mean it is.

 

[Steffen Jensen]

Is the sparkplugs cut of, or cant it take more gas??

It might be your valvesprings thats tired, if its not the sparks.

 

[cgworrall]

I had a similar thing happen with my sei - found through this forum twas the crank sensor, evan though a mechanic told me it couldnt be - and that it was most likely a faulty lambda, so changed the bugger (crank sensor) and she runs like a dream now - part from needin a new clutch and radiator

 

[pasotibbs]

I had a similar thing happen with my sei - found through this forum twas the crank sensor, evan though a mechanic told me it couldnt be - and that it was most likely a faulty lambda, so changed the bugger (crank sensor) and she runs like a dream now - part from needin a new clutch and radiator

I removed the crank sensor yesterday and cleaned it, today the fault remains but the rev limit is now 3500 rpm when loaded but now if I dip the clutch it revs to 5000 rpm, so it seems to me to be more like a fault with the throttle position sensor or injector ?
I suspect the engine revs higher when cold because the ECU richens the mixture but once warm/hot the mixture is to lean to allow the engine to rev higher when loaded ?
I will swap the Lambda,crank and MAP sensors with those on my other Cinq to confirm that I've got good sensors then probably go to the breakers and get a complete throttle body and try that.