2004 xlr shuts off - Cadillac XLR Forum: XLR and XLR-V Forums
 
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post #1 of 7 (permalink) Old 04-24-2016, 01:23 PM Thread Starter
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2004 xlr shuts off

Hey guys ive been looking a lot online to try and find anything that's remotely close to whats goin on with my car.. I have a 2004 xlr have 60k miles on it. bought it 9 months ago has been driving flawlessly. went to turn onto the interstate and died. tried restarting the car for 20 to 30 mins would turn over but wouldn't start. I went under the hood pressed the needle valve on the fuel rail to see if I had fuel and yes (not sure what p.s.i.). I called for help they arrived 15 minutes later we went to start and it fired rite up...drove it home sat for 1 hour drove to a neighboring town 30 miles away no problems came home. later that evening about 2 hours later drove to the bank about 2 miles away died again I let it set for 15 minutes acted like it wanted to start spitting and sputtering but wouldn't. after 2 hours nothing so I called a wrecker he loaded car drove 2 miles 30 minutes later unloaded the car pressed the start button and fired rite up ANY HELP PLEASE ?
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post #2 of 7 (permalink) Old 05-01-2016, 02:24 PM Thread Starter
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update on shutoff

ok since no-one really updates after they get there cars fixed or diagnosed...thought I would update while I go along. I recently went out to test drive the car again to see if it would start after sitting for 2 weeks. pressed start all it would do is turn over. I checked the fuel rail again and now there is 0 pressure no gas at all coming out so im assuming its the fuel pump.

after much reading and investigation found out its the exact same setup as a corvette even the same parts. I tried to find a youtube vid of someone changing an xlr fuel pump and found nothing so next week we will be tackling this problem and ill post a youtube video link for others to try it also.. wish me luck ill update as I go.

ohhhh and also I do not want an acdelco pump im going for an American made aftermarket premium pump(non cheap china made) after talking to several dealers 3 of them told me there has never been a problem from a acdelco or recall from them on these pumps. when in fact I know there has been. im sure they have fixed the issues just don't trust them..
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post #3 of 7 (permalink) Old 05-01-2016, 06:22 PM
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A Tech 2 is an indispensable scan tool to diagnose fuel delivery problems with the XLR. Unless you have one, you'll need to visit your local Cadillac dealer.

The twin-tank fuel delivery system is nearly identical to the C5 corvette.

The Fuel Pump Speed Control module (located behind the splash guard over the left/front wheel well) starts the fuel pump in the left side tank when the ignition is engaged. There's a secondary fuel pressure regulator in the left tank sender unit. The fuel pump contains a reverse flow check valve. This valve (along with the two pressure regulators) maintains fuel delivery pressure to prevent long cranking times.

Replacing the fuel pump is a big job as there's a lot of interference that has to be removed before the tank can be disconnected and removed to access the fuel pump. Unless you have a lift and access to all the tools, (after the proper diagnosis is made) I'd drive/flatbed the car to a dealership and then open your wallet wide.

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Last edited by ccclarke; 05-01-2016 at 06:27 PM.
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post #4 of 7 (permalink) Old 05-02-2016, 05:20 AM Thread Starter
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doesnt throw any codes at all

it isn't throwing any codes at all I don't think a faulty fuel pump throws codes from what im reading. only the regulator does. I have rebuilt engines replaced heads ,water pumps, e.t.c. I hope with a lot of mechanical inclination that I can just take my time and it will be done correctly will start Thursday. and ill keep you guys updated and post a video of it so others in the future mite even try it. and its a better way to get to know your car inside and out.
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post #5 of 7 (permalink) Old 05-03-2016, 03:53 AM
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What are you using to scan the car?

CC
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post #6 of 7 (permalink) Old 05-05-2016, 04:50 AM Thread Starter
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the autopart store uses your techII also no codes or faults found after scans. I did find something weird , I left the acc on and it killed my battery, replaced battery car started rite up. the amp gauge you can see slightly move a little from 14 to 15 amps when I 1st put the battery in it was at 17 to 18 and its moving up and down ever so slightly ... altenator?
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post #7 of 7 (permalink) Old 06-10-2016, 08:53 PM
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I had the same problem with my 04 . This problem went on for about a year . It got to the point that I was afraid to drive my car. I carried it to a dealer in Nashville Tn where they wanted 5800.00 to fix it . They were going to replace the entire fuel system. I told them NO THANKS. The tach 2 would not tell me what was wrong. With the help of a friend we hooked up a fuel pressure gauge with a long hose & taped it to the windsheld. He drove the car for 3 weeks & it never missed a lick.I picked it up & drove it a few days before it quit. I had 0 fuel pressure. We knew then that it was the fuel pump.We put it on the rack pulled the driver side exhaust, pulled the shifter linkage , drooped the fuel tank, & removed the old pump very carefully in peasies as not to split the tank. We re assembled Problem solved no problems since.
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