When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Yup, if wastegate isn’t moving or is stuck, you’ll get the boost plausibility error
if wastegate stuck open then does it really cause misfire at idling?? It had little misfire before but it's getting worse after I did all the stuffs above.
They could be unrelated. Since you have an N14 engine, it’s possible that valves need cleaning, or are starting to wear out. I would change plugs and coils to address the misfires.
They could be unrelated. Since you have an N14 engine, it’s possible that valves need cleaning, or are starting to wear out. I would change plugs and coils to address the misfires.
I have replaced only ignition coils a week ago and haven't changed the spark plugs. I posted the pics of spark plugs before. I also tested by switching cyl #2 spark plug to cyl #1 and still misfire on cyl #1. no idea. It wasn't like that few days ago..did I mess up something.?? I cleaned MAF sensor before and let it dry at least 10 mins and put that back on last time.
@yyj3869 Excellent! I am glad you found it. Absolutely get the Detroit Tuned oil lines. Lastly from your video your valves have got to be cleaned! @njareka is correct dirty valves can and will cause a miss fire. On a N14 motor they need to be walnut blasted any time after 35k or 40k. Like I said I just get mine done, I don't wait for the problem to start.
You can buy all the stuff to do a walnut blasting yourself.
Keep us up on how it goes.
@yyj3869 Excellent! I am glad you found it. Absolutely get the Detroit Tuned oil lines. Lastly from your video your valves have got to be cleaned! @njareka is correct dirty valves can and will cause a miss fire. On a N14 motor they need to be walnut blasted any time after 35k or 40k. Like I said I just get mine done, I don't wait for the problem to start.
You can buy all the stuff to do a walnut blasting yourself.
Keep us up on how it goes.
I purchased these spark plugs from amazon. I believe these are for stage 1 or 2 tuned mini but I wonder if It's okay to install on mine even if it wasn't tuned.
Sorry, but I would never buy spark plugs from Amazon. Too many counterfeit products on there. Buy from one of the forum sponsors, or from any reputable supplier like NAPA. Same with coils. I’ve heard too many horror stories that started from replacement parts bought off Amazon.
@yyj3869 A tune advances the timing and will richen up the AFR, a cooler plug is used to help with preignition, knock. knock is the engine killer even more than momentary lean conditions. So long answer, it won't hurt but it would be best to use the normal heat range plugs if you don't have a tune. Plugs are the least of your worries right now, but I would go head and change them while your at it. The ones in the picture are fine. They are the correct color. If the misfire goes away when the motor gets to running tempter your valves are causing it. Sorry I sound like a broken record but......
@yyj3869 Long story that may help. I have an 2006 Exige. The first owner put a supercharger kit on it. The kit came with a tune. The second owner put a TVS900 SC on it and the shop said they retuned it. I am sure they did not. It went to a third owner then to me. Man the car ran great. Till I did a track day. I melted the number 1 plug. Everyone said it must be running lean. So I added an AFR gage to the car. It was not running lean, it was running rich during WOT, as it should, maybe a little too rich. At the time the car still had the stock ECU with a tune and the narrow band O2. It took some time to figure out what was up. What I found was the tuner was know for advancing the timing too much to add more power, then he would go very rich to try and stop knock. What I had was knock problem. You can have knock without hearing it.
Knock disturbs the bound layer in a cylinder allowing the flame to touch things it shouldn't like my plug. I don't believe in bolt on power anymore. Will it work, maybe. Your ECU with a stock tune, narrow band O2 can only adjust so much. I say this because I see you may get a bigger turbo. If you do I would take it to a tuner that can make sure no adjustments are need to be made.
I am over simplifying here but I want you to understand every thing is interconnected. The Manufacture designed the car in a very narrow band on performance and it will only scale so far.
@yyj3869 Long story that may help. I have an 2006 Exige. The first owner put a supercharger kit on it. The kit came with a tune. The second owner put a TVS900 SC on it and the shop said they retuned it. I am sure they did not. It went to a third owner then to me. Man the car ran great. Till I did a track day. I melted the number 1 plug. Everyone said it must be running lean. So I added an AFR gage to the car. It was not running lean, it was running rich during WOT, as it should, maybe a little too rich. At the time the car still had the stock ECU with a tune and the narrow band O2. It took some time to figure out what was up. What I found was the tuner was know for advancing the timing too much to add more power, then he would go very rich to try and stop knock. What I had was knock problem. You can have knock without hearing it.
Knock disturbs the bound layer in a cylinder allowing the flame to touch things it shouldn't like my plug. I don't believe in bolt on power anymore. Will it work, maybe. Your ECU with a stock tune, narrow band O2 can only adjust so much. I say this because I see you may get a bigger turbo. If you do I would take it to a tuner that can make sure no adjustments are need to be made.
I am over simplifying here but I want you to understand every thing is interconnected. The Manufacture designed the car in a very narrow band on performance and it will only scale so far.
I just did vacuum tester on wastegate with camera through o2 sensor hole and the wastegate is stuck opened even I give a pressure on them and I don't see any movement at all. It's time to change turbo then?
I also pulled out spark plugs and put camera inside of all cylinders and let me know what you guys think.
@yyj3869 If the wastegate is stuck open like yours is then as others have said yes you need a new turbo. Even the mini dealer said it needed a new turbo. I think your cylinders are fine. But as I have said a few times the intake valves need walnut blasting.
Time to order a new turbo. As far as the Ebay turbo, I cant advise. Maybe some of the other guys hear can help with that.
Do you usually work on your cars or is this the first one?
If the wastegate is stuck open like yours is then as others have said yes you need a new turbo. Even the mini dealer said it needed a new turbo. I think your cylinders are fine. But as I have said a few times the intake valves need walnut blasting.
Time to order a new turbo.
Do you usually work on your cars or is this the first one?
@MCS02 Thanks for your quick response! Yeah the dealership was right. I mean I kinda wish that It could be easy fix like exhaust leak like last time (3 bolts were loose) and I didn't want to spend much money on this problem and that's why I tried to figure it out myself and I really appreciate you guys for help and explain all the details. Yeah I'm going to do intake valve clean after figuring this problem out first. I'm going to order new turbo on ebay that @MiniManAdam suggested me. I usually work on my car only for like simple maintenance stuffs (oil change, spark plugs, ignition coils). I was pretty scared of what I was doing because I feel like I'm going to mess up something and more however, I learned a lot while I was doing this stuffs.
@yyj3869 Well it could be a sticky fuel injector. Just add a bottle of injector cleaner to a tank of gas. Use 93 obtain, if you can get it out there or as high as you can get. Always use a top tear fuel. They have the most cleaners added to their fuel
If the car were Mine this is what I would do. Install the new turbo then get the valves cleaned. I bet that will take care of all the problems.
You have done well for this being your first time to dig this deep into a problem.
@yyj3869 Well it could be a sticky fuel injector. Just add a bottle of injector cleaner to a tank of gas. Use 93 obtain, if you can get it out there or as high as you can get. Always use a top tear fuel. They have the most cleaners added to their fuel
If the car were Mine this is what I would do. Install the new turbo then get the valves cleaned. I bet that will take care of all the problems.
You have done well for this being your first time to dig this deep into a problem.
I just test fitted turbo gasket and It fits but It's little bit loose as you can see. would it work? it will expand itself once it attaches to exhaust manifold and heats on it?
update: I took my jcw to my friend who fixes minis and he took front end off since we will work on oil filter housing gaskets & oil lines for turbo. Once we remove the turbo and exhaust manifold, guess what... I didn't see this coming but exhaust manifold has little bit of crack and it gone through little bit more inside of it. glad that we found it before we put them back on. another problem was that 3 studs on turbo won't come off and the other 4 or 5 studs connects to exhaust manifold won't come off either so unfortunately, I had to leave the car at his place. He said he will drop the exhaust manifold at the machine shop to weld and make sure there is no crack anymore. We tried to pick up studs for those turbo and exhaust manifold at the dealership but they don't seem to wanna answer the phone lol so I just decided to go for studs from amazon since we can get them by tomorrow.
