The situation when your Mitsubishi Lancer 9 confidently turns the starter, makes characteristic “grabbing” sounds, but the engine never starts, this is one of the most common and annoying problems for owners of this model. Unlike cases where the starter is silent or barely turns the crankshaft, here we understand that the electrical part of the starting system is working, the battery is charged, and the starter is functioning. The problem lies deeper, in the violation of one of the key conditions for the operation of an internal combustion engine: fuel supply, sparking or proper compression.
Drivers often begin to panic and look for complex solutions, forgetting about trivial things like the fuel level or the position of the automatic transmission selector. However Mitsubishi Lancer has its own technical features, especially in the engine control system and immobilizer, which can block starting even with working spark plugs. In this article we will analyze in detail the fault finding algorithm, eliminating unnecessary actions and focusing on the real reasons that are specific to the ninth generation of Lancers.
Primary diagnostics and testing of basic systems
Before you climb under the hood with tools, it is necessary to eliminate the human factor and simple mechanical blockages. Make sure the automatic transmission selector is in the correct position P or N. On Lancer 9 The selector position sensor (TR sensor) can sometimes fail or simply not fully “stick” into parking, which is why the ECU does not give a start command, although the starter can spin the flywheel.
The second critical point is the display on the dashboard. Pay attention to the immobilizer light (green key). If it flashes quickly or stays on after a start attempt, the security system is blocking the injectors. It is also worth listening to the operation of the fuel pump: when you turn on the ignition (before cranking the starter), a quiet hum should be heard from under the rear seat for 2-3 seconds.
If you hear that the fuel pump turns on, the starter turns vigorously, but the car does not start, you should check for the presence of a spark visually or using a diagnostic scanner. The absence of errors on the crankshaft position (CKP) sensor when the engine is not running may be false, since the ECU often does not see the signal until the engine is running. Therefore, you should not rely only on the absence of “Check Engine” errors in this case.
⚠️ Attention: If you notice a persistent smell of gasoline after several unsuccessful attempts to start, stop turning the starter immediately! Prolonged scrolling will lead to flooding of the spark plugs and may cause a fire hazard in the engine compartment.
It is also important to check the integrity of the main fuses responsible for the engine control system (ECU) and the fuel pump (Fuel Pump). On Lancer 9 they are located in a block under the hood and in the cabin. Oxidation of contacts or burnout of the fuse link can interrupt the injector power supply circuit, even if the starter is working properly.
Fuel system problems: pressure and flow
The most common reason why Mitsubishi Lancer 9 It catches but does not start, due to the lack of necessary pressure in the fuel rail. Engines 1.6 (4G18) and 1.8 (4G99) require a stable pressure of about 3 atmospheres (300-320 kPa) for reliable starting. If the fuel pump is pumping, but the pressure is low, the injectors will not be able to spray the fuel in the correct pattern, and ignition will not occur.
The cause of the pressure drop can be not only the pump itself, but also a clogged fine fuel filter, which on these models is located separately from the pump module (in the engine compartment). Also, the fuel pressure regulator (FPR) often fails, which can “drain” gasoline back into the tank through the return line, preventing pressure from accumulating in the rail after the ignition is turned off.
☑️ Checking the fuel system
Dirt in the tank is another enemy. The fuel pump mesh (coarse filter) can become overgrown with deposits, especially if you have been driving for a long time with low fuel levels or refueled at dubious gas stations. In this case, the pump hums, but its performance drops to zero under load.
How to check pressure without a pressure gauge?
You can carefully unscrew the fuel hose at the entrance to the ramp (observing safety precautions!) and briefly turn on the ignition. Gasoline should come out in a powerful stream. If it barely drips, the problem is in the pump or filter. However, this method is fire hazardous and requires skill.
Ignition system: spark plugs, coils and wires
If everything is in order with the fuel, we move on to the spark. On Lancer 9 Individual ignition coils are installed (on 1.6 and 1.8), which makes the system more reliable, but the failure of even one coil can make starting difficult, although more often the engine will stall after start. However, if multiple coils or the ignition module (on earlier versions) are not working, it will not start.
Spark plugs are a consumable item that is often overlooked. If the gap on the electrodes is too large or carbon deposits have blocked the spark gap, breakdown will not occur. This is especially true in wet weather or winter. A visual inspection may not give a complete picture, since under pressure in the cylinder the spark may disappear, although it exists in air.
Do not forget about high-voltage wires if they are present in your engine modification. Cracks in the insulation, especially in wet weather, can lead to current leakage to ground. As a result, not enough energy reaches the spark plug to ignite the mixture. Check the wires in the dark - passing “worms” of current will indicate a breakdown.
Unscrew one spark plug, press its thread against the “ground” (the metal part of the engine) and turn it with the starter. The spark should be bright, blue and pierce the gap with a characteristic click. An orange or weak spark is a sign of a problem with the coil or wire.
It is also important to check the connectors on the coils. Due to vibrations and thermal expansion, contact inside the chip may disappear. Oxidation of contacts or broken wires inside is a common disease of age-related Mitsubishi. Move the connectors when trying to start, a contact may appear.
Sensors and electronics: the role of DPKV and DPRV
The electronic control unit (ECU) makes a decision to supply fuel and spark only when it receives a signal from the crankshaft position sensor (CPS). If this sensor is faulty, contaminated with metal shavings, or its connector has come loose, the ECU “does not see” that the engine is rotating and does not give the command for injection and ignition. The starter turns, but the car is silent.
The camshaft position sensor (CPS) also plays a role, especially during startup. It helps the ECU determine the phase (compression stroke) in order to supply a spark at the right moment. On Lancer 9 If the DPRV malfunctions, the car can start the second or third time or operate in emergency mode, but often starting becomes impossible.
| Sensor | Startup Problem Symptom | Test method |
|---|---|---|
| DPKV (Crankshaft) | The starter turns, but there are no flashes, gasoline does not splash | Continuity test with a multimeter, inspection for chips |
| DPRV (Camshaft) | Long startup, unstable idle | Diagnostics with a scanner, replacement with a known good one |
| Oil pressure sensor | Starting is possible, but the pressure lamp is on | Replacement (cheap, often leaks) |
| Temperature sensor (coolant) | Problems with starting "hot" or "cold" | Comparison of scanner readings and real thermometer |
Often the problem lies in the wiring of these sensors. Frayed harnesses, oxidized contacts in connectors near the exhaust manifold (where the temperature is high) can interrupt the signal. Check the integrity of the wires going to the crankshaft pulley and valve cover.
Lack of signal from the DPKV is one of the most common reasons why the Lancer 9 turns over but does not start. Checking this sensor and its connector should be one of the first procedures.
The influence of the immobilizer and locks
Standard immobilizer on Mitsubishi Lancer 9 - a reliable but capricious system. If the ECU does not receive the correct code from the chip key, it blocks the injectors from operating. Outwardly, it looks like this: the starter works properly, the engine “cages”, but immediately stalls or shows no signs of life at all. The green key indicator on the instrument panel will blink at double speed or stay on.
The reason may be a dead battery in the key fob itself, damage to the chip (fell, was in water) or a malfunction of the reading ring around the ignition switch. Sometimes it helps to bring the key close to the lock or use a second, spare key for diagnostics.
It is also worth mentioning non-standard security systems. If you have an engine immobilizer installed and it malfunctions or its battery is dead, it may block the fuel pump or starter. Try switching the alarm to the "Service" (Valet) mode or temporarily removing the blocking relay from the circuit to check.
Mechanical problems and compression
If there is a spark, fuel is supplied, the sensors are working, but Lancer 9 it still won't start, it's worth thinking about the mechanics. The most common reason is a timing belt that has jumped. If the belt has cut teeth or has jumped several teeth, the valve timing will be disrupted. As a result, the valves will open at the wrong times and normal compression will not occur.
Checking compression is a mandatory step if the previous steps did not produce results. Low compression may be a result of piston wear, stuck rings, or, worse, burnt-out valves. On 4G18 and 4G99 engines, when the timing belt breaks, the valves often collide with the pistons, which leads to a major overhaul.
Also, do not discount the suction of unaccounted air. If somewhere after the mass air flow sensor (MAF) there is a crack in the pipe or a corrugation is loose, the mixture will be too lean to ignite. Inspect all air pipes for cracks and the integrity of the clamps.
⚠️ Attention: When checking the timing belt, do not try to turn the crankshaft counterclockwise and do not turn the starter if the belt is removed or loosened. This can lead to valves meeting pistons and costly repairs.
Seasonal characteristics and operating conditions
In winter, the “starting but not starting” problem is often aggravated by condensation in the tank. Water that gets into the fuel freezes in the filter or in the ramp itself, blocking the supply of gasoline. Using high-quality dehydrator additives and refueling at trusted stations helps avoid this.
In the summer, in the heat, a “vapor lock” effect in the fuel line is possible, although for injection Lancer this is less typical. More often in the summer, overheating of the gasoline pump, which is cooled by the gasoline itself, affects it. If there is little fuel in the tank and it is hot outside, the pump may overheat and stop pumping at the required pressure.
In damp weather (rain, fog), moisture can get into the distributor (if older versions have one) or onto high-voltage wires, causing a breakdown. The contacts in the connectors under the hood also oxidize. Treating the contacts with a spray like WD-40 or specialized contact cleaners may temporarily solve the problem.
What to do if the car stalls in a puddle?
If the engine stalls after driving through a deep puddle, do not try to start the car right away! Check the air filter. If it is wet, water has entered the cylinders (water hammer). An attempt to start will lead to the breaking of the connecting rods and destruction of the cylinder block.
Why does Lancer 9 start and immediately stall?
Most often, this is a sign of the standard immobilizer working (the key does not see) or a large amount of air being sucked in (malfunction of the IAC or mass flow sensor). It is also possible that the fuel pressure regulator is releasing pressure immediately after the pump stops.
Could it be the catalyst?
Yes, if the catalyst has collapsed and clogged the exhaust system, the engine will “suffocate”. Gases cannot escape, new portions of the mixture do not arrive. You can check by temporarily unscrewing the exhaust manifold from the catalyst (if the design allows) or by measuring the back pressure.
How often do you need to change spark plugs on Lancer 9?
For conventional nickel spark plugs, the range is about 30,000 km, for iridium spark plugs - up to 60,000 km or more. However, in city conditions and less-than-ideal fuel, it is better to change them more often, every 20-25 thousand km, to avoid starting problems.
Does the quality of gasoline affect starting?
Absolutely. Low octane causes detonation, and the presence of water or impurities may prevent the mixture from igniting at all. If, after refueling at a new gas station, the car stops starting, most likely the gasoline is to blame. It will have to be drained.
What to do if the battery is dead, but the starter turns?
If the starter turns, but sluggishly, and the car does not start, there may not be enough voltage to operate the ECU and the pump, although the starter has enough to rotate. Try to "light" from another car. If the situation does not change with a good battery, look for the reason in the ignition or fuel system.