Common sense of car maintenance and repair, the cause of car failure can be found here. If you want to know more about your car, here is a good way to supplement your car knowledge. No matter for me or for you, it is an opportunity to get to know each other and the beginning of making new friends. It may not be reproduced without the permission of the original work
The MINI case I wrote today has some twists and turns. First of all, this car is a second-hand car bought by motorists. Who knows that I was dizzy in the car by crying in the pit of a bad second-hand car dealer. Every time I got on the car, I was full of depression. This car ran to the repair shop from the time I bought it. During our overhaul, we found that the vehicle had been replaced before [intake pressure sensor, carbon tube solenoid valve, throttle, valve cover, spark plug, failure still unsolved]. Through the diagnosis, we found that the fault is very simple, that is, the mixture problem, as well as the working condition of the machine itself, the two faults add up to this series of problems. Through data flow and waveform analysis, we found that the first abnormal air intake angle and air intake, as well as the abnormal fluctuation of air intake during piston movement, which confirmed the results of our diagnosis after our disassembly. At the same time, the vehicle will be repaired and delivered to the riders.
A good car becomes a bad car after unprofessional maintenance. What is car repair? Car repair is to diagnose and troubleshoot, this is car repair, car repair is a technical work, we can accurately find out the fault point through diagnosis. Avoid waste.
First of all, we still read the fault code, so the fault code is a 002B15 intake pressure sensor credibility fault.
This white mini, which was written in the last article, is also a jitter problem.
An intake pressure sensor that has just been changed elsewhere.
We connect the oscilloscope probe.
Test the intake pulse signal.
First of all, we read the data stream and we find that the location relationship is wrong.
Abnormal air intake was found during the first test.
Through the comparison of our software, we found that there is not enough air intake.
Learn about the previous maintenance history of this car with your friends.
Thanks to this Ya’an rider for his trust in us.
Then we disassemble the engine to confirm our judgment.
Soon we unloaded the engine and decomposed it.
It doesn’t seem to be a big problem to open the valve cover.
When we removed the exhaust branch, we found something abnormal.
A lot of sealants were found when the intake branch was removed. At the same time, there is butter on the valve cover. Isn’t that bullshit?
The removed piston has a fixed string of air.
The exhaust valve is black and the mixer is very thick.
Check the cylinder liner.
The cylinder burns badly. Burning engine oil is very serious. We need to repair it next.
Two MINI are repaired at the same time, one is modified turbocharged, and the other is repaired.
The grinding valve is reliable.
Cleaned parts and machined valve cylinder head.
Part of the seal needs to be replaced.
Check the clearance of the measuring piston.
Measure the clearance of the bearing bush.
Don’t be rusty for a while.
Is about to assemble it in the equipment.
Clean the clean cylinder block.
Fix the crankshaft and install the piston.
Four brand new pistons.
The colleagues brought out work hard and carefully.
The connecting rod screw is fastened according to the standard.
The lower part of the crankcase is glued and bolted to fix the crankshaft.
Placing the cylinder gasket is about to install the cylinder head.
The valve needs to be checked for leaks.
The cylinder head is almost ready to be mounted.
The upper part of the cylinder head is assembled.
I only work at night, but I have no time during the day.
Replace new cylinder head bolts.
Install the oil pump.
The brand-new timing connection pulls the guideway.
It’s almost assembled.
The oil seat gasket needs to be replaced.
It is much more convenient to repair the car on the flip rack.
Install flywheel and adjust timing position
Install the perimeter accessories.
The powertrain is assembled.
Hoist the machine back to the car body.
Keep pressure and add oil.
Replace a brand new air Flowmeter.
Run in place for a while and hurry to refuel. The oil meter has been calling the police for a long time. Come back and continue to run-in.
Road test in the evening to see if the fault is completely eliminated.
The failure did not occur after passing the road test.
Check the oil after the road test.
The 200KM failure does not occur in the road test.
At night, the riders drove the car away and finally said goodbye to the damn wobble. The fault is finally completely eliminated.
CathyMark 
6 
September 8, 2024 
