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Unread 04-24-2009, 06:34 PM   #1
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Arrow ATTN: All with GM 3800 Series II (including Supercharged) Engines!

If you're having issues with it starting or idling, and it keeps getting worse, i can almost GUARANTEE that the problem is your FUEL PRESSURE REGULATOR! We've owned four cars with that exact engine, and three have had the regulator go out. It's $60 at Napa, and takes 5 minutes to replace (right on top of the engine, take off the shroud and it's in front of your nose).

I'm just hoping this will keep people from freaking out when their cars aren't starting or are starting and dying. When they get really bad they'll sometimes kill going down the road. Pick one up and try it out. It appears that these 3800s are notorious for it.

Cheers, Mike
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Unread 04-24-2009, 08:22 PM   #2
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That is interesting, I am going to guess that you started with the fuel filter, then maybe replaced the fuel pump?

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Unread 04-24-2009, 09:58 PM   #3
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Started with the fuel filter, then a friend mentioned the regulator. We figured might as well give it a shot for $60, and ten minutes later the car was running perfectly again. No fuel pump needed.
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Unread 04-25-2009, 12:12 AM   #4
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Hmmm...I've got a 3800, and I've been chasing a rough idle problem for ages...but the fuel pressure at the front fuel rail is right where it should be when the vehicle is running - am I correct in assuming that this means its not the regulator?
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Unread 04-25-2009, 07:10 AM   #5
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Originally Posted by Gandalf View Post
Hmmm...I've got a 3800, and I've been chasing a rough idle problem for ages...but the fuel pressure at the front fuel rail is right where it should be when the vehicle is running - am I correct in assuming that this means its not the regulator?
Could be wrong but maybe you tried it on the wrong side. It probably has plenty of pressure to the regulator, but the regulator's cutting off that pressure. If it starts and dies quick, or when you let off the gas and it kills, i highly suggest trying this.
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Unread 04-25-2009, 09:02 AM   #6
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No, it runs fine, starts fine, has never died on me, it just vibrates when idling, the idle jumps around, and sounds bad, and under heavy rpm I get decent power, it just doesn't sound and feel quite right. I've had a couple mechanics I know look at it, and some say its fine, others agree that there's some small issue that's not quite right. Mostly its just the rough idle though.

And where exactly is the regulator at? I checked the pressure on the pressure-test valve on the front fuel rail.
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Unread 04-25-2009, 12:04 PM   #7
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No, it runs fine, starts fine, has never died on me, it just vibrates when idling, the idle jumps around, and sounds bad, and under heavy rpm I get decent power, it just doesn't sound and feel quite right. I've had a couple mechanics I know look at it, and some say its fine, others agree that there's some small issue that's not quite right. Mostly its just the rough idle though.

And where exactly is the regulator at? I checked the pressure on the pressure-test valve on the front fuel rail.
GM regulators usually leak on the vacuum side sending extra fuel in the intake that may cause your rough ideal when it gets bad enough it will kill the car just pull the vacuum line off the regulator while the car is running if fuel comes out it's bad they can also just not work right but nor leak but we change alot of them nor,mally for leaking.
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Unread 08-31-2009, 05:59 AM   #8
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I've got a question. Recently my GP GT has been starting.... rough, if you will. I'll turn the ignition and it will chug to start up and/or the RPM's will dip/rev between 600 and 1200 on a cold start up(cold as in outside temp-cold) until I give it some gas where it will idle fine at 950-ish. Could it be a regulator problem or something worse?
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Unread 08-31-2009, 09:47 AM   #9
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Does it ever make any noises? Does it do it when sitting at a stop light or ONLY when it's starting? When and how did this start doing it?
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Unread 08-31-2009, 11:17 AM   #10
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Nah it only does it at startup. The car runs amazing for it's age(the mileage is great), I just need to change the cat(loss of power in O/D at low RPM's, there was a recall on 2000-2001 GP's for the fiberglass inside the cat breaking and blocking flow) and that small problem with the starting.
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