So, I was able to drive my mini perfectly before I decided to change and use Sprintex supercharger with DOS A to A Intercooler…..!!!

I have faced:
- Throttle rising and falling at idle as if I was revving the car to 1500rpm and then releasing the throttle constantly
- Boost leak which I couldn’t detect
- A very hot exhausted air

When I checked the DTC’s using Bytetronic FA53, I found the followings:
P1229 Throttle Sensor Adaptation Failure.
P0036 HO2S Heater Control Circuit (Bank 1 Sensor 2).
P1109 Manifold Air Pressure Sensor Too High in Deceleration.
P1242 Secondary Upstream Manifold Air Pressure Sensor Too High in Deceleration.
P0301 Cylinder 1 Misfire Detected.

Action points:
- Throttle body: Changed
- Bypass Valve: OK
- MAP sensor: OK

Please help me driving my Mini like the old dayes……..

 

The best way to drive your car like your old days is to change back the old supercharger sorry for that

 

You have a system with very little data on it, so troubleshooting may be difficult. If you haven't, try Myne's, see if they're willing/able to help.

First place I'd look is the intercooler boots--make sure there are no tears or leaks. It's the simplest place to start/look. If you don't get anywhere with that, you may be in for a headache....

 

Are you sure its not leaking at the intercooler boot?
Look from the back under it.
or use something flamable that wont leave a mess like starting fluid
to spray on the connections and look for a change in idle.
odd that its fluxuating so much and has not just gone into limp mode.
also what do your spark plugs look like.
at any point did you put the supercharger and intercooler on and it worked right?
if so what did you change between then and now?
also if your sensors are older you may want to consider changing them as performance applications tend to degrade them far quicker.

 

I'm with Colin, you have a leak somewhere, what boots are you using? And do you still have your stock I/C that you can try as a trouble shooting method?

I've never seen any of these issues mentioned with any of the Sprintex installs, must be something directly related to the connections or mechanicals involved with your specific install.

Also check the connections for the vac. lines to the S/C, make sure the o-rings are coorrect and in place and that the bolts for the compression fittings are tight. Sounds to me because your having more problems than would normally be associated with a simple boost leak.

And also yes, because your map sensor "was" good, you need to make sure that it "is" good, if you know someone with another MCS, ask them if you can borrow theirs to double check.

 

Check for air leaks from the bypass valve into the Sprintex inlet tube. If you installed it like you would with an M45's plastic inlet it is near impossible to get a good seal.

 

Thank you all for help...

I have found an article about detecting boost leak and I'll try it to fix the leak issue...

I'll consider all your recommendations... and I'll give you the result

 

You definitely have a leak.


I agree with starting with the bypass valve.

 

Dont forget to post your impressions in the owners thread. >>> HERE <<<

I will add your names to the list.

 

Is there a boost tap on the DOS IC? If so, is that tap connected or plugged? Just throwing things out in case there's one...