Well...

I have had many troubles with my heavily modded Cooper S

I have everything powertrain-wise M7 - DFIC, Injectors, Cosworth Head, 180 thermo, Air Gain System, Schrick Cam, and maybe more I forgot

I have replaced the throttle body back to the stock one as my 59 mm seems to be giving me trouble

I used to read 12 codes with my OBD II scanner, now I read 2 - P0172 - System Too Rich

Now I have a feeling this is from the 180 degree thermostat - what do others feel - have other people experienced this reaction to the changed thermostat

I know my engine is not reaching the correct temperature, but I wanna make sure there is nothing else wrong

Also, now the car stalls when I come off the gas rolling into a stop light in neutral

If I come into an intersection with the car in third at 4K rpms, then put it in neutral and coast to a stop, she will drop in revs and turn off

Any ideas what I going on with my car

I used to have two major vaccum leaks - both of which are now gone and she has no problem idling - in fact she purs like a kitten

But I wanna know how to stop her from stalling when I coast in neutral and how to get rid of that stupid light

Thanks


Anthony

 

I have most of the same mods that you have and the only code I get once in awhile is the P0172. It started after the 400cc injectors and I get it less often since the MTH software install. I would still look for vacuum leaks since I don't think the 180 thermo is going to cause the car to stall. If you have a vacuum/boost gauge you would have a better idea if there is a leak. I can't think of anything else except for some sensor being bad. Good luck and post the fix when you figure it out.

Steve

 

Did either of you find a solution to this problem? I just had a new head installed and am having the exact same issue vlkwagen describes.

 

You need only to look at your signature to see the root of your problems.

 

What is that suppose to imply? I don't want to assume what you mean, as it could be completely different.

-Cody

 

Hmmmm I don't think that could be more vague

To try to answer the question. If you are running larger injectors with the stock map you certainly can throw the 1072 code. I did it 440s when I dropped them in prior to the turbo. With the stockies back in the code cleared up and the car runs fine. Is it possible that you are running uprated injectors?

I would also look to a vacuum leak. You may have the obvious ones addressed, but without a gauge its tough to say you don't have a smaller nigling one causing the stalling issue.

 

Any injectors other than stock and JCW are going to give you problems. 400/440 CC injectors are just garbage redrilled OEM ones that have retarded spray patterns and cause fuel pooling. More than likely your car is stalling because it's flooding at idle. The throttle body would have caused your idling issues, glad you got that worked out.

Big no no's on the MINI, stop putting enormous injectors on a car that makes 190 hp to the wheels (I ran 340 injectors up to 220+ HP to the wheels on BOTH my MINI's without any fuel issues) and leave the damn throttle body alone! It's pure profit for whoever sells it to you, they cost $20 to machine your old one and then they sell it for $400 to some unsuspecting soul, and it only causes problems for the engine computer.

Think about it, if the computer thinks x CC's of air should come into the engine when the throttle body is 20% open, and y CC's of air come, it's going to completely throw off AF calculations, idle, and a whole bunch of other crap. Not to mention if people are running the stock throttle body making 300 whp, I don't see it being an issue in a car making more than 100 whp less... .

Sorry this turned into a rant, but I see threads about too rich and idle issues and 99% of the time it's someone with a pulley and 440 CC injectors and/or an enormous throttle body making 160 whp .

 

I think he's implying that M7 makes inferior performance parts. LDG and DMH are on a "Lets knock all the paying vendors on NAM" streak .

 

If the shoe fits.

 

thats funny since DMH is a tennis instructor from what i have heard

And luckydog just stated why i will never buy from him

 

Here is more info on my problems. I have a stock throttle body and JCW injectors. The car was dyno tuned about 8 months ago, 12.5 AFR with stock injectors at the time. I switched to the JCW injectors approx. 6 weeks ago and the car ran fine without changes to the ECU. Now, my car runs great when it's cold. Once up to operating temp is when I start to have problems. Idle is fine, running is fine, but stalls on deceleration. Thanks for your help.

 

Very professional. If you're going to dog another vendor you might want to sign on under your own name...

 

I have read LDGs post elsewhere, which makes it clear he prefers tuning to hardware. Since I don't mod, I can't comment on that. However, as a vendor, it may be more productive for him to explain, rather than ridicule. Even if his solution (whatever it may be) is ultimately the correct one in this case, I surely would not be inclined the use a vendor who started our relationship by dissing what I have done, without explanation.

 

You bring up some very interesting points.

 

12.5 AF is very lean for a controlled dyno, that means when it's warmer out you could be running in the high 12's to low 13's. Thats engine blowing territory.

I think the lean AF probably had more to do with the tune than the injectors.

As for the stalling on decel, i'm not sure.

 

You say that you read two codes, what is the other? How many miles?. I'm not sure how mechanically inclined you are, but I would look at the plugs, swap pre and post 02 sensors and watch and note the fuel pressure when this happens.

 

If you are 12.5 post-cat that is probably safe. Somewhere around a point is burned off in the cat. That is a very rough estimate though. Stoic is around 11.7 though and you shouldn't go much leaner than you are now.