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  Topic Review (Newest First)
07-09-2011 01:06 AM
Re: Reduced engine power

She has been at the dealership since the problem occurred. I've been busy with work so I haven't had a chance to speak with the tech, I get everything through my wife. The tech sounds baffled, I'm afraid to see the bill. SMH
07-07-2011 03:22 PM
GM Customer Service
Re: Reduced engine power

Dear AsaSmith,

I have read your posts about your situation with your Outlook. Did you get the vehicle into the dealership? Curious as to how your situation is going.

Michelle, GM Customer Service
06-26-2011 09:06 PM
Re: Reduced engine power

Long post with cut and past about DTC P0087 from the service manual:

Service Information
2009 Saturn OUTLOOK - AWD | Acadia, Enclave, OUTLOOK, Traverse (VIN R/V) Service Manual | Document ID: 2056019

DTC P0087, P0088, or P0089
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0087: Fuel Rail Pressure (FRP) Too Low

DTC P0088: Fuel Rail Pressure (FRP) Too High

DTC P0089: Fuel Pressure Regulator Performance

Circuit/System Description
The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5-volt reference voltage on the 5-volt reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a solenoid valve. The ECM provides a voltage on the FRP regulator high circuit and ground on the FRP regulator low circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the ECMs high circuit driver energizes the FRP regulator and the low circuit driver pulse-width modulates (PWM) the low circuit to ground.

The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel pressure sensor and the FRP regulator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

Conditions for Running the DTC
• DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.

• The ignition voltage is less than 18 volts.

• The deceleration fuel cut-off (DFCO) is inactive.

• The engine speed is greater than 25 RPM.

• The air bag is not deployed.

• DTCs P0087, P0088, and P0089 run continuously when the above conditions are met for 5 seconds.

Conditions for Setting the DTC
The actual fuel rail pressure is 1,500 kPa (218 psi) less than the desired fuel pressure. The condition exists for greater than 5 seconds.

The actual fuel rail pressure is 3,600 kPa (522 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 seconds.

The fuel rail pressure regulator command necessary to maintain the desired fuel rail pressure is +/-2,500 kPa (363 psi) of the command expected by the controller. The condition exists for greater than 5 seconds.

Action Taken When the DTC Sets
• DTCs P0087, P0088, and P0089 are Type A DTCs.

• A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC
DTCs P0087, P0088, and P0089 are Type A DTCs.

Diagnostic Aids
• A skewed fuel rail pressure (FRP) sensor, or an intermittent condition in the FRP sensor circuits will set these DTCs.

• Leaking or restricted fuel injectors may set DTC P0089.

Reference Information
Schematic Reference
Engine Controls Schematics

Connector End View Reference
Component Connector End Views

Description and Operation
Fuel System Description

Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification
•Observe the DTC information with a scan tool. DTC P029D, P02A1, P02A5, P02A9, P02AD, P02B1, P0627, P0628, P0629, P069E, or U0109 should not set.
⇒ If a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle.

•Attempt to start and idle the engine.
•Observe the DTC information with a scan tool. DTCs P0087, P0088, and P0089 should not set.
•Engine idling, observe the Actual Fuel Rail Pressure parameter with a scan tool. The pressure should be approximately 3.5-5.5 Mpa (508-798 psi).
•Command an increase and decrease in fuel rail pressure with a scan tool. Observe the scan tool Actual Fuel Rail Pressure parameter. The Actual Fuel Rail Pressure should increase or decrease with each commanded state.
•Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: Circuit/System Verification must be performed first or misdiagnosis may result.

•Test the fuel system for 345-414 kPa (50-60 psi). Refer to Fuel Pressure Gage Installation and Removal.
⇒ If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis.

Note: As little as 2 Ω of resistance on either circuit of fuel pressure regulator (FRP) solenoid will cause these DTCs to set. Test the circuits of the FRP solenoid for a high resistance if you suspect a condition.

•Remove the high pressure fuel pump assembly and visually inspect the lobes on the camshaft for unusual wear.
⇒ If the lobes appear normal, replace the high pressure fuel pump assembly.

⇒ If the lobes are worn, replace the camshaft.

Component Testing
Static Test
•Ignition OFF, disconnect the harness connector at the high pressure fuel pump.
Note: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis.

•Test for 0.49 Ω plus/minus 0.023 Ω at 20°C (68°F) between FRP regulator low circuit terminal 1 and FRP regulator hi circuit terminal 2.
⇒ If not within the specified range, replace the high pressure fuel pump.

•Measure the resistance between each terminal and the high pressure fuel pump housing. The DMM should display OL Ω.
⇒ If less than the specified value, replace the high pressure fuel pump.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Camshaft Removal - Left Side

• Fuel Pump Replacement
© 2011 General Motors Corporation. All rights reserved.
06-26-2011 06:50 PM
Re: Reduced engine power

Maybe the other cat went bad and more coil packs, are you taking it to the dealer?

06-26-2011 02:45 PM
Re: Reduced engine power

No timing issues that I know of. No gas smell either. Sprayed intake cleaner in the TB and it took about 60 seconds longer for the warning to come on at start up.
06-26-2011 02:40 PM
Re: Reduced engine power

Haven't had the update yet. Oil changes have been fairly regular. At most 5000 between changes. I didnt trust the "oil life" monitor when I was at 4000 miles from the last change and it said I had 40% life left. My first thought, before I pulled the codes was either a bad injector or coilpack but fuel rail would be pre all of that stuff. It did have a new cat converter at about 50,000 and #3 and #5 coils replaced shortly thereafter. I agree with the fuel pump idea, that it would either work or it wouldn't. But I'm not a mechanic. I thought fuel filter but it's intank and "not serviceable" from what I could find online.
06-26-2011 02:16 PM
Re: Reduced engine power

Low fuel pressure doesn't sound like it could be related to timing or coils. Fuel pump could be the culprit, but I think they usually either work or don't. Might be a fuel leak someplace, not allowing it to get to the proper pressure. Any gas smells?

You might try posting or searching on one of the other forums where there's more traffic since the engines are all the same.

06-26-2011 01:23 PM
Re: Reduced engine power

Have you had any timing chain issues/and or gone in for the ECM recalibration yet? Did you buy it new?, how is the oil change history?, what kind of oil/filter, etc? Some '09 owners have seen the #5 coil pack go bad and the CEL would come on so you could have that and a timing issue

06-26-2011 01:18 PM
Re: Reduced engine power

Sorry I'm on my iPhone and can't figure out how to do that. 2009 Saturn outlook xe awd 76,433. Also the check engine light has intermittently come on the last couple of weeks but usually goes off when you stop and restart the car. My brother in law thought that there was an excess of oil in the throttle body and that maybe the pcv valve was bad. My father in law thinks maybe the fuel pump but it starts and idles fine it just won't go above 25 mph.
06-26-2011 01:10 PM
Re: Reduced engine power


Please fill in your signature with you vehicle info like year, options, etc. This will help other forum members with what direction to turn you too with issues. With a little more info we might be able to help you this issue, meaning other members may have expierienced this.

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