Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[vectrolosys]

Hello,

To start, the Omega is far more driveable than it ever was, but one slight running fault remains.

It accelarates cleanly, but when warm, at part throttle it stutters and hunts slighty, this can lead to a slightly jerky drive. I recently disconnected the battery for a few hours to clear any languishing faults that may have been stored. The car idles very smoothly to add.

Items I have replaced (sensor wise, in order).

Lambda Probe
Air flow meter (with working second hand item)
Cam Sensor
Knock Sensor
Crank Angle Sensor (twice as I killed the other one!!)

Even at part throttle, on the flat at 30MPH, in fourth, it's still getting aorund 38-40MPG on the instantaneous readout.

Anyone able to add any views on this one last hurdle?

Thanks,

JAmes

[Auto Addict]

Fuel filter?

[JamesV6CDX]

Hi James,

I notice you mention disconnecting the battery. I doubt this will clear the codes or help - first thing is to get the codes read, and reset, so you can see if anything new appears. Have you paperclipped it? What were the results?

A few initial thoughts

1) Spark plugs and HT leads ok?

2) Hunting, most likely caused by clogged ICV and breathers? Have you done a thorough clean up of these, and also both sides of
the throttle body?

3) Any air intake leaks anywhere?

Start with this, and see how you get on.

[Marks DTM Calib]

Remember that when crusing at part throttle, this is when the HT system experiences the highest voltage so is the point when any miss fire would be more noticeable (if minor). SUch symptoms tend to point to a failing lead.

Also consider that the EGR might not be quite seating fully or slow to respond due to being carboned up.

[vectrolosys]

Remember that when crusing at part throttle, this is when the HT system experiences the highest voltage so is the point when any miss fire would be more noticeable (if minor). SUch symptoms tend to point to a failing lead.

Also consider that the EGR might not be quite seating fully or slow to respond due to being carboned up.

This is what I thought as well, part throttle would be when the HT leads would cause most issues, I'll replace the plugs and leads and see what happens here, DIS pack was replaced as part of my trouble shooting process earlier this month.

Not far to go now!!. Will check the EGR, but this hasn't been touched, but I will check and clean it though.

Fuel filter was replaced in August.

[Marks DTM Calib]

If you clean the EGR, use paint stripper. Carb cleaner wont touch it.

[STMO123]

Hello,

To start, the Omega is far more driveable than it ever was, but one slight running fault remains.

It accelarates cleanly, but when warm, at part throttle it stutters and hunts slighty, this can lead to a slightly jerky drive. I recently disconnected the battery for a few hours to clear any languishing faults that may have been stored. The car idles very smoothly to add.

Items I have replaced (sensor wise, in order).

Lambda Probe
Air flow meter (with working second hand item)
Cam Sensor
Knock Sensor
Crank Angle Sensor (twice as I killed the other one!!)

Even at part throttle, on the flat at 30MPH, in fourth, it's still getting aorund 38-40MPG on the instantaneous readout.

Anyone able to add any views on this one last hurdle?

Thanks,

JAmes

 :-/

[Marks DTM Calib]

The bosch GM MAF's rarely fail....

[vectrolosys]

The bosch GM MAF's rarely fail....

It's a Siemens one on my 2.0 , unfortunately, not being flushed with cash, I plumped for a second hand item with 28 day warranty .