misfire on 1.8

[Lozza]

hi... ive had a slight misfire on my car now for a while, its the 2003 1.8 16v . Today i popped out to the shop, when i got back into the car i could feel the misfire has got alot worst to the point its jumping. I sevice my car every year (all vauxhall parts). A while back i tryed a different coil pack off a pals veccy that is fine, to see if it was the problem, but there was no diff.... BTW sometimes when i go to start the car (HOT or COLD) it just dies then when i start again its fine... can anyone throw any ideas to what could be causing this misfire please.

Regards Loz

[Envy]

Hello Mate

I had fairly same symptoms as to what your having but mine was fixed once the spark plugs were changed and a second hand coilpack put in.

I was advised to look at the below items as to the cause before this was repaired.

Fuel Filter needs replacing
Fuel pump failing
MAF Sensor failing/failed
Each Lambda sensors could be failing/failed
Check Alternator. Multimeter across battery terminals should be showing a healthy 14 volts or slightly more

Any chance you can get it onto a code reader to see what comes up?

[vectra ste]

hi lozza

as envy said above have you got any codes

the one that keeps cropping up is po170 for the z18xe

this thread is going on at the moment (keep an eye on it)

http://www.vectra-c.com/forum/showth...after-starting

[Lozza]

hi lads... ive just been out and took the MAF off and sprayed some contact cleaner throught and put it back together, started the engine and the revs are slightly higher than they usually are and it seemed ok for about 20 seconds then it started to miss again... could this be the MAF failing? hmm

[vectra ste]

have you got any codes?

[Lozza]

no m8, im going to borrow a reader later today so ill keep you post muk

[vectra ste]

ok

[Lozza]

Ok so i read the car with a laptop and this is the out come....

Number of stored fault codes: 1

U2107 - Invalid Data from BCM (Body Control Module)
(71) - Present

Number of stored fault codes: 1

B0967 - Park Pilot Switch Circuit Open or High Voltage
(05) - Present

^^^^ these are the fault codes that came up.

Measuring blocks information:

B1S1 O2 Sensor Heater (Bank 1 Sensor 1),Active
B1S1 O2 Sensor (Bank 1 Sensor 1),156 mV
B1S1 Air/Fuel Ratio (Bank 1 Sensor 1),Lean <<<< this switches between Rich and Lean
B1 O2 Sensor Loop (Bank 1),Closed
B1S2 O2 Sensor Heater (Bank 1 Sensor 2),Active
B1S2 O2 Sensor (Bank 1 Sensor 2),801 mV
B1S2 Air/Fuel Ratio (Bank 1 Sensor 2),Rich
B1 Short Term Fuel Trim (Bank 1),-2 %
Catalyst Protection Enrichment (Bank 1),Inactive
Intake Manifold Valve 1,Inactive
Full Load Enrichment,Inactive
Desired Engine Idle Speed,688 RPM
Idle Speed Modified,NO
Idle Speed Offset,Inactive
Vehicle Speed,0 km/h
---------------------------------------------------------------------

Measuring blocks information:

Mass Air Flow Sensor,0.62 V
Mass Air Flow Sensor,9 kg/h
Intake Air Temperature,1.25 V
Intake Air Temperature,40 °C
Knock Control,Inactive
EGR Valve (Exhaust-Gas Recirculation),Inactive
EGR Position Feedback (Exhaust Gas Recirculation),1.23 V
EGR Position Commanded (Exhaust Gas Recirculation),0 %
EGR Pulse Ratio (Exhaust Gas Recirculation),10 %
Fuel Tank Ventilation Valve,Active
Fuel Tank Ventilation Valve,14 %
---------------------------------------------------------------------------

Measuring blocks information:

Battery Voltage,13.7 V
Engine Speed,706 RPM <<<< This fluctuates up & down
Ambient Temperature,15 °C
Coolant Temperature,90 °C
Coolant Temperature,1.48 V
Intake Air Temperature,39 °C
Mass Air Flow Sensor,9 kg/h
Normal Engine Operating Temperature,Active
Fan Control 1,Inactive
Fan Control 2,Inactive
Fan Control 3,Inactive
Oil Level,Normal
Engine Oil Level Status,Okay
Cruise Control,Inactive
Cruise Control Tip Switch,Inactive
Vehicle Speed in Cruise Control Range,Inactive
Vehicle Acceleration,- - - m/s2
Vehicle Speed,0 km/h
Brake Switch 1,Inactive
Brake Switch 2,Inactive
Clutch Switch,Inactive
A/C Pressure,700 kPa
A/C Pressure,1.08 V
A/C Relay (Air Conditioning),Inactive
A/C Cutoff Mode (Air Conditioning),System OK
A/C Information Switch (Air Conditioning),Inactive
Malfunction Indicator (MI),Off
Service Vehicle Soon (SVS) Indicator,Off
ETC Limp Home Mode (Electronic Throttle Control),Inactive
Engine Oil Change Warning,Active
Injector Time,3.2 ms
Ignition Spark Angle,9 °CA
Ignition Dwell Time,2.1 ms
Calculated Pedal Position,0 %
Calculated Throttle Position,3 %
Fuel Tank Ventilation Valve,2 %
Knock Retard Cylinder 1,0 °CA
Knock Retard Cylinder 2,0 °CA
Knock Retard Cylinder 3,0 °CA
Knock Retard Cylinder 4,0 °CA
IAC Adaptation Slope (Idle Air Control),3.1 %
Idle Speed Fuel Trim,6.6 ms
Partial Load Fuel Trim,-47 %
Full Load Fuel Trim,16 %

[vectra ste]

well i thought coilpack but you have tried that

what have you tried so far?

[Lozza]

spark plags, coil pack, cleaned throttle body... (slight change in idle but misfire still there) and used some contact cleaner on the MAF... it seemed ok for about 20 second when i sprayed the MAF but then went bk to the same misfire

need someone who knows what them readings are tbh.