2003 Vauxhall Astra



June, 3, 2010 AT 8:38 AM

Engine Mechanical problem
2003 Vauxhall Astra Two Wheel Drive Manual 80,000 miles

I have a Vauxhall Astra 1.6 SXI 2003 plate. IT has an intermitting misfire on piston 2
I have changed spark plugs, checked coil pack, had a number of compression tests done, had all teh wireing checked for breaks, Ecu checked and all are fine yet this problem persists. The only thing that has helped a bit is putting non conductive gel on the spark plugs. Any ideas please


7 Answers


opel parts greece

June, 3, 2010 AT 1:51 PM

Checked coil pack means that work ok?



June, 3, 2010 AT 2:28 PM

Yeah the coil pack has been check, tried a different one and had the same problem.
As far as im aware if it was the coil pack, the pistons work start playing up in pairs.
1 and 3 or 2 and 4, but the problem is piston 2 and iv noticed that the temp of the car goes up to 87c withing 5 mins.

I also have a new thermostate on the car as well.


opel parts greece

June, 4, 2010 AT 12:57 AM

Spark plugs Ok and correct?
Crankshaft sensor failure? (Most common/reprogram the ECU )

Give me your chassis number and engine number so I will add the fault to TECH2 for suggestions



June, 4, 2010 AT 3:06 AM

Spark plugs have been changed twice
right type and have used the standard and the GMs
Compression is fine, well thats what the vauxhall garage and an independent garage said, I have a friend coming round to do his own tomorrow.

I have had my friend go over the everything with a tech 2 and all that cames up is p0302.

When I get home later il give the chasey number and engine type.


opel parts greece

June, 4, 2010 AT 4:47 AM

According to P0302: Cylinder 2 Misfire Detected
Too many misfires detected by the crankshaft position sensor

Check hose connectors and fittings on intake system / vacuum system

Check all vacuum lines of the following component for tightness and proper installation: Check air filter for fouling and correct mounting.
Intake hose
Check function of the tank ventilation.
B21 Sensor - Absolute Pressure, Intake Manifold
Brake Booster
Y4 Solenoid Valve - Exhaust Gas Recirculation
Check the following component for tightness and proper installation: Oil Dipstick
Oil Filler Cap

Check the following component for tightness and proper installation: Y4 Solenoid Valve - Exhaust Gas Recirculation
exhaust manifold
B117 Sensor - Oxygen, Mixture Control, Heated
B118 Sensor - Oxygen, Catalytic Converter Check
Exhaust system
Catalytic Converter
(leakage, blockage)

Check fuel reserve
Check fuel tank for correct fuel sort content
Note: The fuel reserve must be greater than 5 L

Check the following functional group for proper operation: Spark plugs
Perform a visual check of the following components: Catalytic Converter

Defective component: T1 Ignition Coil - Direct Ignition

Note: Check catalyst for mechanical damage by tapping against the shroud. Perform visual check of catalyst shroud for thermal overheating (red-violet discoloration).

Injectors are cleaned and you saw it after?
Not correct fuel rate or water in the tank?

While its idling, give the EGR valve a good tap. It may not be seating well and will cause low RPM misfires.

Common Problems That Trigger the P0302

Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
Incorrect ignition timing
Vacuum leak(s)
Low or weak fuel pressure
Improperly functioning EGR system
Defective Mass Air Flow Sensor
Defective Crankshaft and/or Camshaft Sensor
Defective Throttle Position Sensor
Mechanical engine problems (i.E." Low compression, leaking head gasket(s), or valve problems
Common Misdiagnoses

Fuel Injectors
Oxygen Sensor(s)
Power Train/Drive Train problems
Polluting Gases Expelled

HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog
CO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas
NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog



June, 4, 2010 AT 5:23 AM

Thank you for all that I will go through it all tomorrow and see what comes up.

Whats currently happening is, once iv put dieelectric grease on the ceramics of the spark plugs the car drives ok for a week then the catylist lite starts to come up.
Always piston 2 misfire.

With in 5 mins the temp reaches aboput 87c
and it starts to runble and then the catylist light starts to flash around 35mph

it seems to be that something is coursing the spart for piston 2 to arch, the grease stops it for a while.
It feels like pressure is building up basically.

The tech 2 shows that everything is fine though other than the misfire.

I had a man out who sells the tech 2 equipment to go through everything.


opel parts greece

June, 4, 2010 AT 8:50 AM

Hmmm looks catalyst as you say about the light. Do not forget that their life is at about 60K (a nd their cost not so economy)

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