

Old Timer
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About Old Timer
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Rank
Reader (10+ posts)
Profile Information
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Gender
Male
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Location
NC
Previous Fields
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Car Model and Year
2005 Cadillac Base Deville
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Engine
NORTHSTAR 4.6L V8 VVT (LH2)
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fuel pressure problem
Old Timer replied to mrhalcomb's topic in Cadillac Deville, Eldorado, Seville, Fleetwood, Sixty Special
The PCM should ground the fuel pump relay for 3 seconds when the key is turned on. After that the OPS grounds the fuel pump relay. If you are getting a foam from the fuel line the pump is sucking air, like OldCaddyTech said. Are you sure there is plenty of fuel in the tank? -
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Why not just back flush the heater core with a garden hose? If junk comes out then you know what was wrong. If the core starts leaking, then replace it. Also if junk comes out, you should flush the entire cooling system, but not with the machines they have out. I personally don't think they work well. I have an old school type flusher that uses compressed air and water. Works great. Just my 2 cents.
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Certainly worth a try. Thanks for the input. I have to replace the radiator this weekend, so I'll try that then. Radiator doesn't have anything to do with pulling the back seat, but I'll have the car. The wife drives it to work all week and puts 120 miles on a day, so I do what I can when I have it.
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I got it from RockAuto, but the modes work fine. It is the temperature that is out of wack. It is the original. This is the second mode door actuator. The first one I removed the entire dash to replace it, this time I left the big gear assembly and just pried the actuator off the big gear. I don't ever want to pull the dash again!
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I had to replace the "mode" actuator because of a stripped gear. After I replaced it, air is blowing cold and then hot out of the vents. It also switches cold and hot from side to side. I did pull the wrong actuator at first. I pulled the one to the rear of the "mode" actuator, but I put it right back on. It seems to blow out of the correct ducts, but the temperature changes dramatically without changing the temperature setting. I read that to re-calibrate the HVAC system I should disconnect the battery and short the positive and negative battery terminals together, and then run the HVAC through all the modes and temperatures manually. I did that with no changes. I also read to pull the IP fuse for 60 seconds, but didn't try that yet because it was for a different year and model. I pulled the code and come up with a B0429, which from what I understand is the auxiliary temperature door. I am thinking that is for the rear. Am I wrong about that? Any help would be greatly appreciated. The wife is not happy about the constantly changing temperatures. Happy wife, happy home. Unhappy wife, unhappy home. I have seen some threads on here about similar issues, but it always talks about using a Tech2. Thanks
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tech2 made by HP
Old Timer replied to slim0321's topic in Cadillac XLR and XLR-V Help and Discussion Forum
I personally got a BAFX bluetooth OBDII adapter and use it with my android phone. I got the Torque Pro app on Google Play. It also works with my Windows laptop with Scan XL. The adapter and Torque Pro cost me about $30.00 and has worked on everything I have put it on including my 2005 Deville and a 2015 Buick Regal. It is not as comprehensive as a Tech 2, but for checking codes and live data stream it works very well. Just my 2 cents. -
I never could get clear information about where the tach signal comes from. It could be the cam sensor. It was a lot easier to diagnose problems when I worked in the Cadillac dealership. They have any information available you could ever need, but they don't want to give any of that out. The service manager that I worked with even treats me like a stranger. I knew the guy for about 20 years. The GM training centers were great and gave a bunch a literature when I was sent for classes, but that was a long time ago. I worked in the dealership when the nightmare 8-6-4 came out, but mostly I worked on the diesels. I was in it for a lot of the evolution up to the Northstar, and then opened my own shop. This 2005 came from the factory painted dark blue, but it should have been lemon yellow cause it has had problems one right after another.
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Fuel PSI is between 41-45 running. I spent hours with torque pro on my phone and Scan XL on my laptop with no results at all. RPM at cranking stayed around 150, which from everything I have read was normal. Having an RPM reading kind of ruled out a bad crank sensor or 2, since this engine has 2. In desperation I pulled the PCM out and pulled the connectors off. Cleaned the connectors with CRC electrical cleaner and tapped on the PCM. Reinstalled the PCM and the car cranked right up. I'm not sure if this would be a fix, but it's running fine again now. Hope this might help somebody in the future.