Misfire at 1200rpm

**bristlenose** · 20-08-2011,06:55 PM

My 1.8 b5 passat seems slugish and unresponsive.When i pull away from a standing start i get a slight rumbling from the engine,also at speed if i take my foot of the gas she seems to give a kick.Small misfires from cold and generally not very nice to drive.Once up to temp if i hold the revs at 1200 she misfires and the revs go up and down continually,also driving down a hill no load on engine and at 1200 she seems to cangeroo when driving.If i drive her hard things get a little better ,seems like a fuel air intake prob to me.I live within the surrey area and would appreciate any help.

**yaman** · 20-08-2011,07:20 PM

Could be a lot of things, from coil-packs to engine speed-sensor.

Need to start with a code-read

Regards
Jim

**bristlenose** · 21-08-2011,07:52 PM

Thanks Yaman,
May well invest in a reader with a view to buying another vw in the future but my faith in vw is diminishing.

**Crasher** · 21-08-2011,09:15 PM

Year and engine code?

**bristlenose** · 22-08-2011,06:39 AM

Hi Crasher,
The passat is a 1998 model, and an ADR engine.
Regards,andy

**Crasher** · 22-08-2011,10:03 AM

Coil pack/lead issues are common on this engine.

**bristlenose** · 22-08-2011,06:09 PM

Is there a fault code for coil/leads ?
Can i just say this missfire only seems to be when the throttle is just slightly open.I'm a carb man myself and this just seems to point to air/mixture to me.When i start from cold you get small bumps and miss-fires and when it's warm just now and then.When the throttle is only just partially open the revs go up and down and missfires.
I wish i could go to my local vw franchise but had too many bad experiences there.!!!
A reputable garage near Camberley for a diagnosis would be great.

**Crasher** · 22-08-2011,08:47 PM

No the ADR will not recognise any HT circuit faults in the ECU’s diagnostics. I wonder if it is a broken inlet manifold flap actuator. Pop the cover off and check.

Then check the arm

**bristlenose** · 22-08-2011,09:24 PM

I know where you are coming from at this point,had a similar symptom a few years ago and the arm had broken,chuging and generally orible in traffic.Replaced at a dare i mention
£136.00.I wish it were that simple.