6

Unfortunately, oil consumption in these engines can be quite large. GM has put out service bulletins which says that engine use up to 1 quart per 2000 miles is perfectly normal. I found some information on the bulletin: (NOTE: - I was unable to find the actual bulletin, but the following is an excerpt from it, which was copied into the forum link I provided ...


5

I wouldn't recommend drilling the hole since you don't know what's under it. If the gas (petrol) tank is under the trunk, and you go to far, you could ding or puncture the tank. Not pretty, and expensive to fix. If the open road is under it, then spray from the road could end up entering the car that way. Honestly the best solution is to find out where the ...


3

If the coolants are compatible, they will mix and there shouldn't be any problems. However, if the two coolants are not compatible with each other, you will likely get nasty deposits. If there's enough of them, it may cause an obstruction and your engine will overheat.


3

This is by far the best video I've seen which gives two ways to tell if your catalytic converter is bad. In a nutshell, Eric the Car Guy uses two methods to diagnose a bad converter: He uses a scan tool which uses live data to do just what you are looking at. He is checking to see how the downstream O2 sensor is behaving. Basically it should be fairly ...


3

It sound like an issue inside the gear box (transmission). First thing to get checked is the oil level in the gear box. It could be a simple case of being low on oil. Get it checked and maybe get an oil change. If the noise goes, you then need to find where the oil leaked from and get that fixed.


2

It should be under the dash just to the right of the hood release (based on some internet searching). EDIT: The connector itself should look like this: Most GM vehicles have it just beyond the dash plastic underneath. Since this is a Caddie, it may be under a panel. This video may be of a little help to you.


2

If there is no/insufficient coolant flow in the cooling system then there are a few options: There is insufficient coolant in the system (check the coolant level); It's flowing out of the system (probably on the ground); The thermostat is stuck closed (it's defective and needs replacement); The water pump is not doing it's job (it's defective or not ...


2

Here's a diagram from the service manual. Searching, "2003 Cadillac CTS Vacuum Diagram" provides similar results.


1

You didn't specify where you put the antifreeze, but I assume it is mixed with the oil now. As Paulster2 said, replace the oil now (or later, but not later than starting the car)! Don't start the car before replacing the oil, if there is any significant amounts of antifreeze in the oil! Lots of people drive with small amounts of antifreeze in the oil due to ...


1

Two of your cylinders will run rich due to more fuel being added than the ECU expects. This could cause numerous serious problems. For example - The catalytic converter will work harder to burn the unburnt fuel. Maybe causing the Cat to burn out. The ECU may recognise the rich exhaust caused by the 2 new injectors and weaken the mixture. This could make ...


1

I had the same problem with an Oldsmobile long ago. It would run all day at 55 mph , but would overheat quickly at 60+. It was a bad seal on the water pump . At high speed it leaked behind the fan and atomized the water so there was no sign of a leak except the radiator was low. I replaced the pump and it ran fine for years.


1

Obviously the parts are related, seeing as how the serpentine drive belt is associated with both the idler pulley and the alternator, but realistically the idler is just worn out and one has nothing to do with the other. The idler is a stationary pulley. It's only lot in life is to provide a pivot point and change the direction of the belt as it travels its ...


1

One of two things is going on with your DTS. Since it has air bags in the back, either one of the bags has ruptured or the air compressor has quit working. An airbag is pretty straightforward, as it's just replacement. The compressor on the other hand, may not be. It could be that the fuse/relay which runs the compressor has blown. Or the compressor itself ...


1

There are kits available that replace the electronically-adjustable shocks with standard shocks. They typically come with a couple of small modules that connect to the vehicle’’s wiring harness and trick the computer into thinking the adjustable shocks are still present, so you don’t have to deal with a warning light or message. If you can live with the ...


1

Only way to know is to check it and test it. Is it filled with fluid - electrolyte to the correct level - just above the plates. If it does not have any fluid in it, then it may be a dry-charged battery that needs filling to be ready for use, which probably means it is in “as new” condition. Especially as you mention it is wrapped in plastic. What voltage ...


1

Brakes need: Good sealing at master cylinder. Good sealing at wheel cylinder. Good job removing ALL air within the system via a robust bleeding process. Any of those could cause you issues. And by sealing I mean that all of the piston seals are working correctly. They could look good and still not function correctly. With that said, generally things ...


1

It can either be: Leaks, should be visible for such severity. Empty brake fluid reservoir, that should be under control since you've bled all wheels. Damaged piston washer (I got that few times due to rough and damaged cylinder and low quality rubber on the washer). Do the brake loose effect? or is it just super light? If it doesn't loose effect, just ...


1

As Ben commented, if you use an identical part (same model and part number as the original one) then you should not need to reflash, as the expected settings will be different. If, however you have used a different model/part then you will need to look at the guidance on whether it requires a reflash. Cadillac should have guidance on requirements, or sites ...


1

You're going to need to either bring the car into a shop or you need a enhanced obd2 scantool to confirm the u1300 code and see which module isn't responding. The ignition cylinder lock is controlled by the PCM with inputs from the range switch and the console shift module. You may be correct in thinking that the vehicle doesn't think it's in park. You could ...


1

Bad battery, even though it initially tested well.


1

You didn't list the apps you tried, but Torque (http://torque-bhp.com/) is what I am using (on a different vehicle); however, the Cadillac CTS forums has numerous posts on folks using the app with success.


1

(NOTE: I have copied this answer from the comments above. They appear to be accurate and definitely answer the question. I didn't want the question to appear as unanswered.) For passive resistive load, I do not think the diode is needed. But if you would use a diode, you would connect your positive source voltage to the anode and your receiving equipment on ...


1

I had the same problem and I replaced the DRI er side valve cover the OEM cover has a round hole about e the lifter which squirts oil into your pcv and suck into your intake. The new modified valve cover mover the hole and uses lips around the square hole to divert the oil away from your PVC intake. The pcv intake on my Silverado is a fixed orifice on the ...


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