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Hi All,

I have a problem with my Sky RL, its showing engine power reduced with codes P0087 & P0089. No matter how many times I erase the codes it comes again almost immediately.

After some search online, it seems to be the HPFP causing the issue (any other suggestions?)

Two questions here.

First, is the ACDelco EP1029 as good as the original HPFP GM part 12646884 ?

Second, how do I change the HPFP? I couldn't find any information online. There are only two Skys in my country with no shops to repair it, so it will have to be DIY job.

Thanks for your support. :cheers:
 

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Removal Procedure
1. Relieve the low and high side fuel system pressure. Refer to FuelPressure Relief.
2. Disconnect the engine wiring harness electrical connector (1) from the high pressure fuel
pump.
3. Remove the engine wiring harness clip (3) from the high pressure fuel pump cover.
4. Remove the high pressure fuel pump cover bolts.
5. Remove the high pressure fuel pump cover.
6. Remove the high pressure fuel pump insulator.
7. Loosen the fuel feed pipe to fuel pump fitting.
8. Remove the fuel feed pipe bolts.
9. Remove the fuel feed pipe from the intake manifold.
10. Loosen the high pressure fuel pipe fitting at the fuel pump.
11. Loosen the high pressure fuel pipe fitting at the fuel rail.
12. Remove and discard the high pressure fuel pipe.
13. Remove and discard the high pressure fuel pump bolts.
14. Remove the high pressure fuel pump.
15. Remove and discard the high pressure fuel pump gasket.
16. Remove and discard the high pressure fuel pump O-ring.
17. Remove the high pressure fuel pump roller lifter, if necessary.

Installation Procedure
1. Lubricate the high pressure fuel pump cylinder head bore and roller lifter with silicon free
engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
2. Install the high pressure fuel pump roller lifter, if necessary.
3. Install a NEW high pressure fuel pump O-ring.
4. Position the NEW high pressure fuel pump gasket to the cylinder head.
Note: Ensure the plastic bolt retainers are installed in the high pressure fuel pump mounting
holes prior to installing.
5. Install the high pressure fuel pump. Push the pump into the cylinder head bore by hand,
applying force to the top of the pump.
6. Install the NEW high pressure fuel pump bolts hand tight.
7. Ensure that the high pressure fuel pump, and fuel rail fittings are clean prior to assembly.
8. Lubricate the high pressure fuel pump, and the fuel rail fittings with silicon free engine oil
GM P/N 12345610 (Canadian P/N 993193) or equivalent.
9. Install the NEW high pressure fuel pipe.
10. Tighten the high pressure fuel pipe fitting to the fuel rail hand tight.
11. Tighten the high pressure fuel pipe fitting to the fuel pump hand tight.
12. Place the fuel feed pipe onto the intake manifold.
13. Install the fuel feed pipe bolts hand tight.
Caution: Refer to Fastener Cautionin the Preface section.
14. Tighten the fuel feed pipe to fuel pump fitting hand tight.
14.1. Tighten the fuel feed pipe bolts to 10 N·m (89 lb in).
14.2. Tighten the fuel feed pipe to fuel pump fitting to 30 N·m (22 lb ft).
14.3. Tighten the high pressure fuel pipe fittings to 32 N·m (24 lb ft).
14.4. Tighten the high pressure fuel pump bolts evenly to 15 N·m (11 lb ft).
15. Install the high pressure fuel pump insulator.
16. Position the high pressure fuel pump cover.
17. Install the high pressure fuel pump cover bolts and tighten to 10 N·m (89 lb in).
18. Connect the engine wiring harness electrical connector (1) to the high pressure fuel pump.
19. Install the engine wiring harness clip (3) to the fuel pump cover.
20. Inspect for leaks using the following procedure:
20.1. Turn ON the ignition, with the engine OFF for 2 seconds.
20.2. Turn OFF the ignition, for 10 seconds.
20.3. Turn ON the ignition, with the engine OFF.
21. Install the low side fuel pressure service port cap.
22. Tighten the fuel fill cap.

Fuel Pressure Relief
Warning: Fuel that flows out at high pressure can cause serious injury to the skin and eyes.
ALWAYS depressurize the fuel system before removing components that are under high fuel
pressure.

1. Install a scan tool to the vehicle and command the fuel pump relay OFF, allowing the low
pressure fuel pump to shut off.
2. Start the vehicle and allow the engine to idle until the engine stops. The engine will stop in
approximately 20-30 seconds.
3. Turn the ignition OFF.
4. Using the scan tool, verify that there is little to no fuel pressure, if there still is fuel pressure
repeat step 2.
Note: If a scan tool is not available, WAIT at LEAST 2 hours after the engine has been run,
before removing the high pressure fuel line.
5. Remove the high pressure fuel line.
 

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How does one go about relieving the fuel pressure to check it? Or do I really need to? I have a gauge with a Shrader valve. Thanks for your help. I'm still looking for whatever is causing my lean code. The car runs fine, only a slight stumble from time to time. But I want to get whatever is causing me to run lean fixed. So...pretty much the only thing that I have to check is the fuel pump pressure and make sure it's where it needs to be...
 

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How does one go about relieving the fuel pressure to check it? Or do I really need to? I have a gauge with a Shrader valve. Thanks for your help. I'm still looking for whatever is causing my lean code. The car runs fine, only a slight stumble from time to time. But I want to get whatever is causing me to run lean fixed. So...pretty much the only thing that I have to check is the fuel pump pressure and make sure it's where it needs to be...
More info here: P0089 with no other DTC's - Replaced fuel pressure sensor to no avail
 

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Anyone know what Scan tool (other than Dealer) can command the command the fuel pump relay OFF?
 

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Possible causes for lean or erratic fuel trims:

1. Failing HPFP (Update: Pull the dipstick and smell for gas in the oil. If you have gas in the oil, most likely the HPFP is failing. Also, when my HPFP failed, it was throwing a very low rail fuel pressure at cruise: Something like 700 PSI read during the "incident snap shot". Should have been at least 1000-1200 at cruise)

2. Failing HPFP Control Solenoid, or bad connection at wiring harness connection to Solenoid.

3. Small crack in Intercooler or bad clamp on one of the charge pipes. (Boost leak just large enough to cause a lean condition at cruise or idle, but not large enough to throw a P0101 code for boost charge failure. So check the "snap shot" of engine parameters at the time your lean code is thrown. If it is at cruise or idle RPM, there's your sign)

4. Partially failing EVAP purge solenoid. (This one is a long shot, because typically you will observe an error code for the EVAP system as well. However, it is possible for a failing EVAP system to effect fuel trims. And your described "stumble" is a classic symptom of the EVAP purge solenoid opening when it shouldn't and causing that symptom.)

5. Failing LPFP (this one is a real long shot, because typically the LPFP works or doesn't work, not a partial failure)

6. Failing injector or injectors, or injector seals.
OR buy an NA an avoid all those problems...:D...:rolleyes::banghead::leaving:
 

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And cut down the "fun to drive" quotient by 50% :D :cool: :willy:
That high??:eek: No way brother, no way, besides we could always add a SC and get back some of supposed 50% loss you conjured up....:lol::cheers:
 

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And cut down the "fun to drive" quotient by 50% :D :cool: :willy:
I'm gonna have to find a Redline to drive and see how much "better" it is.........:lol:

Terry
 

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I'm gonna have to find a Redline to drive and see how much "better" it is.........:lol:

Terry
Having spend time in each, my recommendation is do not drive a turbo car. period.

If you are happy with your NA, stay happy with it.

Its kind of like dont sleep with some wild young chick knowing that you are going home to your wife of 20 years.

I get to drive a 500 hp car and a 300 hp car back to back and its an interesting experience. Going to a 150 hp car would be . .. a bad experience.
 

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Its kind of like dont sleep with some wild young chick knowing that you are going home to your wife of 20 years.
I definately understand!!!
:lol: :cheers: :jester:

Terry
 

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Having spend time in each, my recommendation is do not drive a turbo car. period...
Oh I totally disagree, once into a more powerful car and seeing what a few more ponies could give you is GREAT incentive to get that SC or turbo the NA.. Oh yea baby..:cheers::thumbs:
 
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