Zafira Running problems

**japn** · 14th February, 2010, 11:57 PM

I have an intermittant fault with a Vauxhal Zafira 1.8 Z18xe engine,
Maybe more than one fault but when running from cold get complete loss of power seems to lose it's throttle then all of a sudden revs to about 3000rpm on occassion, then it would clear itself. also generally rough running and when under load revs at about 5000rpm missing as running to lean.

when looking at data the o2 sensor does not seam to switch between rich/lean as it should but just sits on lean.

also has the following fault codes stored in ecu.

P0170 Exhaust lean

P1555 Throttle position sensor load signal not plausible with engine

load
P0301 Cylinder 1 Misfire Detected
P0130 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

the missfire on no.1 cylinder should proberbly ignored as switched between cylinders as the other day was on Cylinder 4.

any ideas guys.

**oldford** · 15th February, 2010, 09:24 AM

Looks like a leak somewhere in the intake system or a faulty MAF to me.
Engine is running (dangerously) lean.

**obdmaster** · 15th February, 2010, 10:05 AM

Originally Posted by oldford

Looks like a leak somewhere in the intake system or a faulty MAF to me.
Engine is running (dangerously) lean.

100% agree, nice one oldford

**r6eck** · 15th February, 2010, 01:58 PM

Maf is common on this,lean condition at idle and rich at cruise,have a look at fuel trim in live data,
if you fit a new maf either reset adaptions or give car a good run as it will still run rough till this is done

P1555 load not plausible with throttle is caused by a dirty throttle body,good clean with carb or brake cleaner will sort this

**diga1** · 15th February, 2010, 07:45 PM

replace or check o2 senzor

**japn** · 15th February, 2010, 09:35 PM

Thanks for the advice guys I have been researching online and boy oh boy do these zafira's have problems I have come across MAF sensor faults and many people also mentioning to clean out breathers as a hole gets blocked, when cleaning out the throttle body is there a stepper motor that needs cleaning out too.

**japn** · 15th February, 2010, 09:40 PM

Is there a way the Air flow sensor can be tested.

**smirnoff_rules** · 15th February, 2010, 09:51 PM

just get one from the scrappy m8 . if it clears it get a new one from opel only no copy ones there crap ..

**japn** · 15th February, 2010, 10:09 PM

Originally Posted by smirnoff_rules

just get one from the scrappy m8 . if it clears it get a new one from opel only no copy ones there crap ..

Ok mate will do Cheers

**bonecrusher** · 16th February, 2010, 04:31 PM

Nope.There is no stepper motor.

**djwaldemaras** · 16th February, 2010, 04:38 PM

spark plugs and ignition coils is in good condition? misfire in cylinder = oxygen in exhaust, lamda sensor voltage drops to 0volts = system to lean

**Aajii** · 29th May, 2014, 06:41 PM

old message, but today had Zafira with
fault codes:
misfire cyl1, misfire cyl2.
lean mixture
Engine don't rev over 3000rpm.

Reason:
Catalytic converter blocked.