Vanos system won’t work after cylinder head replacement.

Car will not run properly have to unplug VANOS to get it to stop misfiring. This is a steady misfire on cylinder 2 and multiple misfires on 1 and 3. P0300 and P0302.
All new spark plugs, coils, new cam sensors and VANOS solenoids. Checked wiring ok.
This is a brand new cylinder head. Timing chain is original did not replace but did replace chain tensioner.
Installed with a local mechanic. If I unplug either VANOS sensor car runs fine expect when cold start.
Could this happen if the timing chain was off and the adjustment is outside sensor range?

My car has 69000 miles.
My car has an auto

Experienced mechanics share their insights in answering this question :
Hi there. It is possible that the timing chain is the source of this problem. The two error codes P0300 and P0302 typically indicate a random misfire or misfire for cylinder 2 (the P0302 code specifically). However, it’s also possible that the lack of new tensioner is creating an issue as well. I’m rather baffled why you needed to replace the cylinder head with only 69,000 miles, but if it was due to an overheating problem, then it is more likely that you have an electrical wiring harness malfunction; if the vehicle actually overheated. Not sure what advice to offer you since there are multiple variables we simply don’t know. You might want to have a different mechanic try to resolve this issue.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If you have an oil leak down the front of the cylinder head, inspect the solenoid area for fresh oil. The MINI R56 N12, N16 and N18 engines utilize two VANOS (variable camshaft timing) solenoids — one for the intake camshaft and one for the exhaust camshaft, mounted to the front of the cylinder head.
Yes, had this happen on a small Hyundai , same with a neighbour ! The VVT solenoid would not return fully to the idle position putting the timing off and causing a stall. The car could just about be started if you put your foot on the gas but would stall if you took it off.
Minis develop technical issues from time to time. One that is most common to the brand is a Variable Valve Timing (VVT) issue. The VVT system is one of those components in your car that you may not be familiar with.
Common signs of a faulty VVT solenoid include the Check Engine Light coming on, dirty engine oil, rough engine idle, and decreased fuel economy.
Vanos (or variable Nockenwellensteuerung) is BMW`s take on VVT and was first introduced on the M50 engine within the 5-series of the 90s. It also uses cam phasing but with a helical gear within the cam gear which moves towards or in the opposite direction to the camshaft, altering the lobe angle.
A malfunctioning VVT solenoid can prevent the valve timing from advancing or retarding as needed. As a result, the engine may exhibit performance problems, such as rough running and poor acceleration.
A failing VVT system can cause valves to open at incorrect times, causing a massive decrease in fuel efficiency and engine power. Decreased performance – A failing VVT system can decrease the performance of your engine when it is under load.
Solenoid coil failure can be caused by a number of factors. Applying an incorrect voltage to the coil will cause it to fail and may cause the coil to burn out. Electrical surges or spikes may also damage the coil. Burnt out coils cannot be repaired and will need to be replaced.
When a solenoid is first energized, its coil receives a pulse of high inrush current that decreases as the plunger closes. If the plunger does not close, the high inrush current continues, which can cause the coil to overheat and burn out. This is the most common cause of solenoid failure and spotting it is easy.
Basically, it varies the valve timing by shifting the phase angle of camshafts. For example, at high speed, the inlet camshaft will be rotated in advance by 30° so to enable earlier intake. This movement is controlled by engine management system according to need, and actuated by hydraulic valve gears.
Rusting, power failure, irregular pressure, missing equipment, an incorrect amount of voltage or current, dirt stuck in the system and corrosion are some of the possible reasons why a solenoid valve may not properly close or open.
When the VTC actuator fails, it can cause a range of symptoms, including engine misfire, rough idle, loud engine noise, reduced fuel efficiency, and a check engine light.
Symptoms of issues with a VVT system include a rough idle, engine noise, an unstable idle, stalling, lack of power, and decreased fuel efficiency. Motorists will often be alerted to the issue by the Check Engine light.
Just like other sensors and switches on your car, the VVT switch is designed to be a lifetime part.
A bad or faulty connected VVT solenoid can and often does cause engine knocking, inconsistent idle and acceleration problems. The issue could be with the solenoid itself or the electrical harness connected to the VVT.
0-8K rpm.
Without proper engine oil pressure, the VVT system cannot operate as designed. Obviously, low engine oil pressure can cause catastrophic engine damage in addition to adversely affecting the VVT system.
The Variable Camshaft Timing (VCT) solenoid is an actuator. It is commonly supplied with an ignition live (15 V) and a duty cycled ground provided by the engine management control unit.
To check whether the idle air control valve is functioning properly, start the engine and let it run for about 10 to 15 minutes. If the valve is functioning correctly, the engine will sound good and the idle will be steady versus too high, too low, or inconsistent.
Manual Reset Solenoid Valves

This is what is known as Manual Reset. To cause the valve to change from its rest state, the coil must be energised and the lever or knob pulled to the fully open position. If the valve is energised without the manual intervention, it will not open.

If there`s no power to the coil or if power is interrupted, the solenoid will cease functioning and remain in whatever position it was last in. Often, power interrupts to the circuitry can cause the valve to stick, and it will remain that way even after you restore power, requiring a reset.
Abnormally high or abnormally low ambient temperatures to which a solenoid is exposed for an extended time may cause a solenoid to burn out. High Temperature. Coil insulation may be damaged and one layer of wire may short to the next layer. A heat shield or baffle will give some protection against radiated heat.
1. The number of turns in the solenoid: If the number of turns in the solenoid is large, they will produce a greater magnetic field produced (magnetism). 2. The strength of current in the solenoid: If the current passing through the solenoid is larger, stronger will be the magnetic field produced (magnetism).
IVC is considered by many to be the most important timing event decision affecting both performance (peak torque) and/or economy. IVC is a major component of Volumetric Efficiency. The amount of the air/fuel charge is predominantly controlled by IVC.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Vanos system won’t work after cylinder head replacement.
ANSWER : Hi there. It is possible that the timing chain is the source of this problem. The two error codes P0300 and P0302 typically indicate a random misfire or misfire for cylinder 2 (the P0302 code specifically). However, it’s also possible that the lack of new tensioner is creating an issue as well. I’m rather baffled why you needed to replace the cylinder head with only 69,000 miles, but if it was due to an overheating problem, then it is more likely that you have an electrical wiring harness malfunction; if the vehicle actually overheated. Not sure what advice to offer you since there are multiple variables we simply don’t know. You might want to have a different mechanic try to resolve this issue.

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