Thread: Water ingress via plenum heater air intake

Hi Onebob,

Great that you have solved this.
And it looks very neat (and inconspicuous), so well done!

Andrew

Originally Posted by AndrewMilne

Hi Onebob,

Great that you have solved this.
And it looks very neat (and inconspicuous), so well done!

Andrew

Phillip’s sikafkex solution also solves the root cause although i expect that when the time comes for eventual removal of either the sikaflex or tape bonds, then that will likely be destructive to the original plenum rubber seal. I found though that there are some readily available rubber extrusions that look like they will work well to cap the top edge of the plenum cover and at the same time a provide a raised edge at the glass contact point to support a bead of sealer which might neatly deal with the warping issue some experience.

Originally Posted by onebob

Today we had a break in the rainy weather which allowed me to make a start on investigating the wiring loom. Easily located the C0290 header connector and found that someone had been there before me and I’ve had the nearly 10 years. The connector was taped to the loom with electrical tape that oozed water from between the wraps when squeezed. There is a cap on the connector that I should take off to to check the condition of the wire connections inside but it is refusing to move. This is my first experience with this type of connector and i don’t want to destroy it. Perhaps all that’s needed is some contact cleaner to spray inside to displace any water that’s in there, we will see.... more soon.

Hi Bob,
What needed to be removed to find the blue connector? I am also experiencing loss of speedo occasionally at startup.

Originally Posted by biggin

Hi Bob,
What needed to be removed to find the blue connector? I am also experiencing loss of speedo occasionally at startup.

I removed the glovebox, and the cardboard kick panel. The loom is attached to the bulkhead just below the heater blower. The blue connector will be found to the left of loom bulkhead clamp covered by a fabric sleeve. Remove the adhesive tape at the end of the sleeve and slide the sleeve to the right to uncover the connector.
IMG_3105.jpgIMG_3136.jpg

It seems that this connector is not the problem with my speedo as it looks clean and dry and I have good continuity from SLABS ECU to instrument cluster.
I can also see road speed at the Motronics ECU via Nanocom, so I suspect the problem is within the instrument cluster itself.
Is it possible to test operation of the speedo using a Nanocom?
Also, has anyone found speedo and odometer problems within the instrument cluster?

Originally Posted by biggin

It seems that this connector is not the problem with my speedo as it looks clean and dry and I have good continuity from SLABS ECU to instrument cluster.
I can also see road speed at the Motronics ECU via Nanocom, so I suspect the problem is within the instrument cluster itself.
Is it possible to test operation of the speedo using a Nanocom?
Also, has anyone found speedo and odometer problems within the instrument cluster?

Motronics ECU? - this is new to me, can you give more information pls.

The ECU that controls the V8 motor in a D2.

Originally Posted by biggin

1. Is it possible to test operation of the speedo using a Nanocom?
2. Also, has anyone found speedo and odometer problems within the instrument cluster?

1. Yes, from SLABS - Outputs - Speedometer (on/off)... the instrument should react to the command
2. Yes, it can be instrument failure as long as you see the speed reading in the ECU and there is continuity on the wire to the IP.