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Engine misfire

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

If that is running, it is too high. Max is 62 engine off. It sounds like the fuel pressure regulator is bad. Do me a favor. Connect the pressure gauge and start the engine. Note the fuel pressure. Then, remove the fuel pressure vacuum hose. Pressure should increase. If it doesn't, replace the regulator. Also, confirm there is no fuel getting into the vacuum hose.

Here are the directions for replacing the regulator. The attached pictures correlate with the directions.

___________________________
2005 Buick Allure (CANADA) V6-3.8L
Procedures
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pressure Regulator Service and Repair Procedures
PROCEDURES
FUEL PRESSURE REGULATOR REPLACEMENT

REMOVAL PROCEDURE

IMPORTANT: Always maintain cleanliness when servicing fuel system components.

Pic 1

1. Relieve the fuel pressure. Refer to Fuel Pressure Relief Procedure.
2. Clean any dirt from the fuel pressure regulator retaining ring.
3. Remove the vacuum line from the pressure regulator.

Pic 2

4. Remove the snap ring (7).
5. Using a shop towel to catch any spilled fuel, lift and twist the fuel pressure regulator in order to remove the fuel pressure regulator (6) from the fuel pressure regulator housing (1).
6. Remove the regulator O-ring small (2).
7. Remove the regulator O-ring large (4).
8. Remove the regulator O-ring back up (5).
9. Cover the fuel pressure regulator housing (1) to prevent contamination from entering the fuel system.

INSTALLATION PROCEDURE

NOTE:
- Do not use compressed air in order to test or clean a fuel pressure regulator as damage to the fuel pressure regulator may result.
- Clean the fuel pressure regulator filter screen with gasoline if necessary.
- Do not immerse the fuel pressure regulator in a solvent bath in order to prevent damage to the fuel pressure regulator.

Pic 3

1. Install the new O-rings on the fuel pressure regulator (6), if a new fuel pressure regulator is not being installed. Lubricate the O-rings lightly with clean engine oil.
2. Install the regulator back up O-ring (5).
3. Install the regulator O-ring large (4).
4. Install the regulator O-ring small (2).
5. Install the fuel pressure regulator (6) in the fuel pressure regulator housing (1).
6. Install the snap ring (7).

Pic 4

7. Connect the vacuum line to the fuel pressure regulator.
8. Tighten the fuel fill cap.
9. Connect the negative battery cable.
10. Inspect for leaks.
1. Turn ON the ignition for 2 seconds.
2. Turn OFF the ignition for 10 seconds.
3. Turn ON the ignition.
4. Inspect for fuel leaks.
11. Install the fuel injector sight shield.

___________________________

Let me know if that helps.

Joe
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Tuesday, February 11th, 2020 AT 7:50 PM
Tiny
JEFF SORDYL
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I'll work on it. Thanks
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Tuesday, February 11th, 2020 AT 8:41 PM
Tiny
JEFF SORDYL
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I don't have a fuel pressure regulator on my fuel rail or anywhere on the engine. I think it's in the fuel tank? The pressure of 70 was when the engine was running. (My car listed above has a series 3 engine) if that makes a difference.
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Tuesday, February 11th, 2020 AT 8:51 PM
Tiny
JEFF SORDYL
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I'm having good luck! I removed injectors and cleaned with mass air flow sensor cleaner (so I don't destroy any plastic or rubber like carburetor cleaner can). Ran multiple scans had random misfire pending, check engine light went out on its own! Yeah! Running a little better but has a minimal rough idle. I have a new fuel pressure sensor that goes on top of fuel pump, I'm waiting to see if I'm going to need it or not. Going to put injector cleaner in full gas tank and go from there. Thanks a million for helping me with solutions to fix the issues on this Buick nightmare. Please thank Ken and Renee for the shirt and correspondence. 2carpros. Com "Rocks". Saved me hundreds of dollars. Anyone out there looking for solutions to help to fix your vehicle, without having to pay money for answers, this is the only site to go to! All the mechanics are seasoned professionals and work together to find a solution to your specific vehicle needs.
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Friday, February 14th, 2020 AT 9:28 PM
Tiny
KEN L
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You are more than welcome. I would replace the MAF if the problem returns. Use 2CarPros anytime, we are here to help. Please tell a friend.
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Saturday, February 15th, 2020 AT 10:12 AM
Tiny
JEFF SORDYL
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Can this report tell you anything about my car? Still have rough idle in drive? See attachment of report. Or do you have a email I can send report? Can't post it on here file not allowed.
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Friday, February 28th, 2020 AT 1:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

What type of report are you referring to? Also, can you change the file type to attach it for us?

Let us know.
Joe
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Friday, February 28th, 2020 AT 7:20 PM
Tiny
JEFF SORDYL
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Vehicle VIN: 2G4WJ532051333257
Vehicle Manufacturer: Buick
Vehicle Calibration ID: 12598322
12607894

Freeze frame information:

Fuel Status = 0 byte
Engine Load = 32.549 %
Engine Coolant Temperature = 192.2 °F
Fuel Trim Bank 1 Short Term = -1.562 %
Fuel Trim Bank 1 Long Term = -7.812 %
Intake Manifold Pressure = 6.962 psi
Engine RPM = 1,410.75 rpm
Speed (OBD) = 29.826 mph
Timing Advance = 38 °
Intake Air Temperature = 41 °F
Mass Air Flow Rate = 12.53 g/s
Throttle Position(Manifold) = 12.549 %
Run time since engine start = 75 s
EGR Commanded = 21.569 %
EGR Error = 2.344 %
Fuel Level (From Engine ECU) = 50.98 %
Distance travelled since codes cleared = 11.806 miles
Evap System Vapour Pressure = -8,173 Pa
Barometric pressure (from vehicle) = 12.763 psi
Catalyst Temperature (Bank 1, Sensor 1) = 1,042.7 °F
Voltage (Control Module) = 14.265 V
Engine Load(Absolute) = 23.137 %
Commanded Equivalence Ratio(lambda) = 1.005
Relative Throttle Position = 9.412 %
Ambient air temp = 41 °F
Absolute Throttle Position B = 5.098 %
Accelerator PedalPosition D = 8.235 %
Accelerator PedalPosition E = 10.98 %

End of report.
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Friday, February 28th, 2020 AT 7:56 PM
Tiny
JACOBANDNICKOLAS
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Things look mostly normal. Was this test done at an idle? I ask because the MAF seems a bit high. Normally at an idle, it should be near 5 grams per second (G/S). I have a feeling Ken was correct with his last recommendation.

Joe.
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Friday, February 28th, 2020 AT 8:01 PM
Tiny
JEFF SORDYL
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Have new MAF. Still idles rough when in drive. Maybe I could run a scan and put in drive and let idle? Thanks again for your help! Maybe charcoal vapor canister is bad? Has cap light came on last 2 times when fueling up. Had to use pliers to get gas cap off. Have a nice weekend! I'll keep checking for possible vacuum leak in fuel tank/fuel tube/pump etc.
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Friday, February 28th, 2020 AT 11:22 PM
Tiny
JACOBANDNICKOLAS
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Interesting the fuel cap light is coming on. Are you sure there isn't an issue with the filler tube? They can develop pin holes from rust. Just a thought.

Also, are there presently any codes?

Joe
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Saturday, February 29th, 2020 AT 5:17 PM
Tiny
JEFF SORDYL
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Code P0300 came back on. I'll have to check the filler tube. Thanks
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Saturday, February 29th, 2020 AT 6:31 PM
Tiny
JACOBANDNICKOLAS
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A random misfire is wide open to possibilities. Let me know if you find any leaks in the filler tube. If you don't, I'm going to suggest having the EVAP system smoke tested. Basically, smoke is forced into the system at a very low pressure. If there is a leak, the smoke will come out at that point. It could all be related.

Let me know
Joe
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Saturday, February 29th, 2020 AT 6:33 PM
Tiny
JEFF SORDYL
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Sounds good, thanks. I did a review of different car parts I purchased and in it I said, "with the help of (2car pros dot com) figured out which parts needed to be replaced" they check reviews so I had to spell your site like that so it wouldn't get deleted. It's on a few reviews!
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Saturday, February 29th, 2020 AT 6:56 PM
Tiny
JACOBANDNICKOLAS
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Thanks! And you are very welcome. Hopefully, we an get to the bottom of the P0300 now. LOL

You take care and have a good weekend.

Joe
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Saturday, February 29th, 2020 AT 7:51 PM
Tiny
JEFF SORDYL
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Had to reprogram idle. Simple fix, turn on (not running) for30s then off 30sec then on 60sec found manual said to do when replacing maf or throttle body. Runs fantastic, park, idle, drive. 98% perfect. Still have P0303 but can't tell the way it runs. Maybe old injectors need replacing? Reading up on injectors and bad coil in injectors can go bad especially after warming up engine. Check gas cap light went off. Hope I'm not jumping the gun but this runs like a Buick should! Thanks a million!
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Wednesday, March 4th, 2020 AT 2:22 PM
Tiny
JACOBANDNICKOLAS
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You are very welcome. I'm glad it's running good for you. Take care and feel free to come back any time.

Joe
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Wednesday, March 4th, 2020 AT 6:17 PM
Tiny
JEFF SORDYL
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Me again. Lol. Would a a bad or slow firing injector cause all injectors to get out of sync? Are they wired in a series type circuit? One injector read 13 ohms and the electrical connector had 11 volts.
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Tuesday, March 10th, 2020 AT 2:07 AM
Tiny
JACOBANDNICKOLAS
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No one won't cause the others. I do have a question. Ohms is used to test resistance. What was the voltage reading on that injector?
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Tuesday, March 10th, 2020 AT 8:27 PM
Tiny
JEFF SORDYL
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13 volts on injector. In the meantime I'm putting sealer on the gas filler tube. It's pretty rusty so I'll clean it up then put "Seal All" all over the rusty spots and more.
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Tuesday, March 10th, 2020 AT 9:44 PM

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