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The simplest reason not to is the risk of causing over-steer. As the back of a car gets stiffer it increases the risk of over-steer. All manufacturers dial (huge) amounts of under-steer into their road cars, however on the XLR this can be unwise as the active suspension can stiffen up...

Acetone works very well on thread lock. It takes about a minute to work its way in. (And yes, acetone is nail polish remover, that is what I use, on a q-tip.). As no one has mentioned the electrical plugs, I assume they just come off with no problems.

Thanks, I'll look forward to that!

I'm not 100% sure why a plastic sheet will help? The water, if it comes into the trunk, will creep under a sheet. Actually, it can flow under the sheet easily, from where it will pour into the well containing the pump etc. Apart from keeping rain water out of the trunk in the first place...

Thanks Long Tall Sally. I guess we all make silly mistakes from time to time and this week it is my turn. I'm not looking at the top of the shock!! Which leaves the question, what am I looking at? (Just curious). If you move about a foot nearer the front of your X, on top of the chassis...

Hello all I've read many (all?) of the posts on changing the shocks and am left with a bunch of small questions, if anyone can oblige: 1/ Where is the electrical connector on the front shocks? 2/ How do you get the top off the shock? Is it necessary to use circlip pliers to squeeze the...

Ride height sensors?

My understanding is that the anti-theft module will not stop a running engine, it will prevent it from restarting. My finger of suspicion is fuel rail pressure.

Doesn't always work, but if the starter is failing through wear in the switch assembly (the heavy duty switch built into the starter), then typically attaching a boost from a running vehicle (ie, higher voltage) will fix it (to get started). If this does work, it points more firmly at a starter...

Or, the motor is working (so no code, assuming it reads position near the motor), but the mechanism isn't connected.

I can't see anything like that in my printed version. I can't think I have seen anything like that in any GM workshop manual. The information will be out there somewhere, as there are aftermarket scan tools and they work out how to communicate with the various systems. Can you get a scan of the...

How many miles? That symptom is consistent with a failing starter through wear. Works OK cold, starts to stick when warm. Met that before.

This _could_ be a BCM harness end connector problem. If so, it might be very simple. Disconnect the battery, wait a few minutes and remove the connectors from the BCM, get some contact cleaner (not WD40), spray the connectors, air dry and reconnect. As the cost of this check is the cost of...

Good advice, except it is behind the passanger's carpet (in the footwell).

Good - fixed!

I added some more to the end of the post with the workshop manual diagnostics.

Ok. There are I think three options (I have a 2004, wiring codes etc. might have changed): 1/ There is a permanent live into A4 on relay 38. Usually (ie OEM) relay 38 is commanded by the BCM sending a 12v signal to the relay's control coil. C3 is a permanent ground. The 12v signal enters...

If you take that relay out, do the fog lights go out?

12 year old tires are not a good idea IMHO. Suggest you fit new ones. Have a good 2019.

Some owners modify their X to bring the fog lamps on all the time. Possibly yours has been modified by a previous owner?