If your engine is yours VAZ-2106, GAZ-24 or UAZ-469 suddenly began to "trot", lose power at high speeds or completely deaf after warming up, the first check - contact-ignition. A typical symptom: the spark disappears during acceleration or appears only after a few turns of the starter. The reason for 80% of cases lies in wear and tear interrupter, burning runner Or breaking high-voltage wires. Below is a complete system diagram with explanations of each element, a multimeter diagnostic algorithm and step-by-step repair without service.
Contact system (CS) is an outdated, but still common on classic cars design, where the moment of spark formation depends on mechanical break-up in a treadmill. Its key difference from contactless (FD) is the lack of a Hall sensor and switch, which simplifies repair, but requires regular adjustment. contact gap (0.35-0.45 mm) and cleaning from sofa. In this article, we will understand three-node, which most often fail: interrupter-distributor, ignition coil and centrifugal advance regulator.
Device of contact ignition system: scheme and purpose of elements
Classic CSZ consists of 6 main components connected by a single electrical circuit. Below is a simplified flowchart for VAZ 2101-2107, GAZ 24/3102 and similar models with 4-cylinder engines:
```plaintext
[Battery 12B] β [Ignition lock] β [Ignition coil] β [Trumbler]
β β
versus [capacitor]
β β
β β β β β β β β β β β β β β
```
Letβs take a closer look at each element:
- π Battery and ignition lock: serve low-voltage power (12V) to the coil when turning the key. Violations here lead to a complete absence of spark.
- π Ignition coil (B-117A or analogues): converts 12V to high voltage (15β20 kV). Typical malfunctions are interturn closure or breakage of insulation.
- β‘ Trambler (interruptor-distributor): mechanically opens the contacts and distributes the spark to the cylinders. Includes a runner, a capacitor and a centrifugal regulator.
- π Capacitor: extinguishes the spark on the contacts of the interrupter, preventing them from burning. When the capacitor breaks down, the contacts burn in 1-2 days.
- π₯ Ignition plugs: ignite the fuel mixture. A load or an incorrect gap (more than 0.8 mm) leads to ignition failures.
- π High-voltage wires: transmit the impulse from the coil to the trampler and candles. Breakdown of isolation is a common cause of "trotting" on singles.
Detailed electrical circuit for VAZ 2106
Click to zoom in. Designations: K is a coil, P is a interrupter, C is a capacitor, B is a runner.
The feature of the CSZ - dependence on ignition advance angle (UZ). At idle speeds, it should be 5-10 Β°, and when overclocking, it should automatically increase due to the centrifugal regulator in the trampler. If the regulator jammed, the engine will "knock" when gaining speed or lose dynamics.
Signs of failure of the contact ignition system
The system makes itself felt with clear symptoms that are different from problems with a carburetor or fuel pump. Here are the key signs that the CSZ is to blame:
- π Engine's dead on singles.but starts with a "push" - typical for wear of the contacts of the interrupter or breakdown of the capacitor.
- β‘ There's a spark, but it's weak. (orange, not blue) is a problem with the coil or high-voltage wires.
- π₯ "Troaty" at high speeds - a signal of a breakdown of the trampler runner or contamination of contacts.
- π Loss of power after warming up - indicates an increase in the gap in the contacts of the interrupter (metal expands when heated).
- π Clicks under the hood when turning the key - a sign of failure of the coil or condenser.
Engine dead on idles |Sparks not at all |Trouble and power loss |Clicks at start |Another symptom->
It is important to distinguish the problems of the CSZ from the malfunctions of the carburetor. For example, if the engine does not start. generallyCheck it out.
- Is there a spark on the candles (twisted one candle, applied to the mass and scroll the starter).
- Does the voltage come to the coil (12V at the + terminal with the ignition switched on).
- Whether the contacts of the interrupter are opened (checked by the indicator screwdriver).
β οΈ Attention.If there is a spark, but the engine does not start, the problem may be in the forward. Check the marks on the pulley crankshaft and the lid of the GRM - they should match with the IMT of the 1st cylinder.
Diagnosis of the contact ignition system: step-by-step instructions
To check the CSZ you will need: a multimeter, a screwdriver, sandpaper (grain content 600-800) and a control lamp (or an LED with a resistor 1 kΞ©). Start with a visual inspection:
- Check the interrupter's contacts.:
- Remove the trampler cover.
- Evaluate the condition of the contacts: if they are blackened or have notches, replacement is required.
- Measure the gap with a flat probe (normal: 0.35-0.45 mm).
Multimeter in ohmmeter mode:- Connect the probes to the capacitor terminals.
Resistance must first fall to zero, then gradually grow.
If it shows a cliff or KZ, the capacitor is defective.
| Parameter | Norma (B-117A) | Reason for the deviation |
|---|---|---|
| Resistance of primary winding | 3-3.5 Ohm | Interturn closure or break |
| Resistance of secondary winding | 7-9 kom | Breaking the isolation |
| Resistance to mass insulation | 50 MOOM | Current leak to the hull |
Check for 12B on the coil with ignition on |Look at the breaker contacts on the coil and the gap |Test the capacitor with a multimeter |Check the spark on the central wire of the coil |Evaluate the condition of the runner and the trampoline lid->
If all the elements are normal, but there is no spark, check:
- π Integrity of low-voltage wires from the ignition lock to the coil.
- π Correct connection of wires to the trampler (tangled candle wires lead to "shots" in the silencer).
- π Status of the trampler bearing - backlash shaft leads to an unstable spark.
Adjustment of the breaker contact gap
Incorrect gap is the cause of 60% of malfunctions of the CSZ. With a gap of less than 0.3 mm, the contacts do not open completely, and with a gap of more than 0.5 mm, the spark weakens. For adjustment:
- Remove the trampler cover and rotor (runner).
- Turn the crankshaft (key or starter) until the maximum opening of contacts.
- Weaken the screw fixing the contact group and adjust the gap with a probe of 0.35-0.45 mm.
- Tighten the screw and check the gap again (it should not change with a light press on the contact).
After adjusting the gap, be sure to check closed-state angle (CSK). It should be 55Β±3Β° for 4-cylinder engines. Measured by a strobe or by tags on a flywheel.
If after adjustment the engine still "troit", check:
- π§ Axis of the trampler shaft - with skewed runner does not touch the contacts of the cover.
- π Health of the mobile contact spring If it is weak, the gap will βfloatβ.
Typical breakdowns and repair methods
Here are the 5 most common CVD malfunctions and how to fix them without replacing parts:
| Malfunction | Reason. | Repairs |
|---|---|---|
| Spark disappears on a hot engine | Increased contact gap due to thermal expansion | Adjust the gap on the heated engine (0.4-0.45 mm) |
| Strong clicks at launch | Failure of the condenser | Replace the condenser (cost: 100-300 rubles) |
| Spark is weak, the engine does not pull | Burning of the interrupter contacts | Clean with sandpaper or replace the contact group |
| The engine "shots" into the carburetor | Wrong angle of advance | Turn the trambler at 1-2 mm clockwise |
| High-speed ignition failures | Breakdown of the runner or trampler cover | Replace the runner (200-500 rubles) or the lid (300-800 rubles) |
β οΈ Attention.If after replacing the runner or capacitor the problem remains, check centrifugal in a treadmill. Its springs stretch over time, and the advance ceases to be corrected. The solution is to replace the springs or the entire trampler.
For temporary repairs on the road:
- π§ Burnt contacts You can clean them with a knife or sandpaper, but it will only prolong their life by 100-200 km.
- π High-voltage wire breakdown Then, put the stain on the stained area (not for long).
- π A jammed trambler - Drain the engine oil into the shaft (do not overdo it, otherwise the runner will become contaminated).
Replacing the contact system with contactless (BSP): is it worth it?
Many owners of classic cars (VAZ 2101-2107, GAZ 24) considering transition to HIPC. Pros:
- β No wear of contacts (the resource increases by 3-5 times).
- β Stable spark at any turn.
- β Simplified maintenance (no need to adjust the gap).
Cons:
- β The cost of a set of BSZ (from 3 000 rubles).
- β The need to adjust the angle of advance with a strobescope.
- β The risk of buying a low-quality switch (often cheap Chinese counterparts burn).
The switch to the HSZ is justified if you drive regularly. For the βgarage classicβ with a mileage of up to 5,000 km / year, it is enough to maintain the CSZ in good condition.
Replacement will require:
- BSZ kit (Trambler with Hall sensor, switch, coil, wires).
- Stroboscope to adjust the O.R.U.
- Keyset (8, 10, 13).
The average cost of work on the STO: 1,500-2,500 rubles. Self-replacement will take 2-3 hours if you have instructions.
Frequent errors in repair of contact ignition system
Even experienced car owners make mistakes that lead to repeated breakdowns. That's what don't:
- π§ Use the βgrandfatherβ method of checking the spark He's holding a high-voltage wire with his hand. It is dangerous (voltage up to 20 kV!) and can damage the coil.
- π Regulate the gap of contacts βby eyeβ. Even a deviation of 0.1 mm leads to ignition skips.
- π Ignore the centrifugal regulator when setting the OHC. If it jammed, the engine would detonate.
- π Install candles with an inappropriate potassium number. For CSW, it is optimal:
A17DWRM(VAZ)A14D(GAZ).
Typical mistake. Replacement of only the runner without checking the trampler cover. If the cover has cracks or scorching on the contacts, a breakdown of the spark on the mass is inevitable. Always change the runner and lid with a pair!
How to check the cover of the trampler without instruments?
- Remove the cover and examine it from the inside in bright light.
- Cracks or black dots (breakdowns) are a sign of replacement.
- Check the charcoal contact in the center of the lid: it should move freely and not be worn out.
FAQ: Frequent questions about contact ignition system
π§ How to check the ignition coil without a multimeter?
Remove the central high-voltage wire from the trampler and bring it to the mass (for example, to the engine body) at a distance of 5-7 mm. Scroll the starter: if the spark is blue and stable, the coil is in good working order. Careful.Don't hold the wire with your bare hands!
β‘ Why is there a spark, but the engine does not start?
Possible causes:
- Wrong. ignition (check the tags).
- Lack of fuel in the cylinders (the fuel filter is clogged or the gas pump is not working).
- Low compression (less than 8 atm) due to wear of piston rings.
Check the presence of gasoline in the carburetor and compression with a compressometer.
π How to set the ignition on VAZ 2106 without a strobe?
Algorithm:
- Put the piston of the 1st cylinder in the VMT (the mark on the pulley of the crankshaft coincides with the long mark on the lid of the GRM).
- Weaken the nut of the tramblor and turn its body counterclockwise to the point.
- Start the engine and slowly turn the trambler clockwise until you hear smooth operation without knocking.
For fine-tuning, use a control lamp (plug it into the "K" terminal of the coil and the mass). The lamp should light up when the contacts are opened.
π₯ Why do the interrupter contacts burn quickly?
Main reasons:
- Faulty. capacitor (check it with a multimeter).
- Too much gap between the contacts (more than 0.5 mm).
- Use of low-quality contacts (optimally: Beru or Bosch).
Solution: Replace the condenser, adjust the gap and clean the contacts with alcohol.
π Can I drive with a faulty CSZ?
Short term, yes, but it leads to:
- Increased fuel consumption (up to 20%).
- Overheating of the engine due to improper combustion of the mixture.
- Accelerated wear of the piston group.
Long driving with ignition skips can disable the catalyst (if any) or burn the valve.