Question about 1999 Buick Regal

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Engine dies You may be right about the fuel pump, but wouldn't there be a diagnostic trouble code related to low fuel pressure or something? There are no trouble codes, and the engine either runs prefectly or not at all, as if some demon is flipping a switch on and off. I can buy a pressure gauge to check fuel pressure more easily than replacing the pump. What do you think?

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My wifes vehicle did that for about a year in hot weather also.
It was giving PCV valve codes, misfire coded, but finally after her insisting I was wrong, I replaced the fuel pump and fuel filter and it has been running fine ever since.
it would run great when it was cool, then when the outside temp rose into the 80s and 90s it would run about 30-40 minutes and just shut down. Let is set, it would run another half hour or so.
Yeah I understand your frustration, its hard to determine also , even with a gauge by the time you get things disconnected and hooked up, it checks out fine.

Posted on Jul 20, 2008

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I am getting the following codes on my 2002 Nissan Altima v6 3.5 liter P1430, P1420, P1805, P1152, P1102, P1011, P1021 & P1335 I'm going crazy here. Please help!


Definition of Diagnostic Trouble Code P1430 Ford: Electric Air Pump Secondary Lincoln: Electric Air Pump Secondary Mazda: Electric Air Pump Secondary Mercury: Electric Air Pump Secondary Toyota: Intake Constrictor CTRL Circuit Open or Short

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1999 silverado,4.8,v8,1500,code PO137


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Was having trouble with my 1998 GMC 1500 5.7 with it dieing would restart and run for a few but got worse dieing and not starting so i took it in for a diagnostic test they said it had low fuel pressu


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1 Answer

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Hello


The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type. You can run a trouble code test by using the instructions at this website




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1 Answer

I have a 91 Buick Century that dies after a few minutes.


Fuel or ignition problem? Right after it dies, check for spark at a plug. A bad coil will often work till it's warmed up, then fail. If you still have ignition spark after it dies, or if it starts right up again, then it's something else.
Check the fuel pressure to make sure it's at proper pressure. Also scan the computer for any trouble codes that are related. It's easy on your car if you understand how the flashing light translates to two-digit number codes. Use a wire or paperclip to bridge terminals A and B of the diagnostic test connector protruding out from bottom of dash. It's a 12 pin connector. A and B are the two upper right terminals on it. Now turn key on and the check engine light will begin blinking the codes. Code 12 is diagnostic mode-one blink, pause, pause,blink, pause blink. See? 22 would be blink, pause, blink, pause, pause, blink, pause, blink. See? 33 would be three blinks, short pause and then 3 rapid blinks. (I"m going blink crazy!) Well, get the codes-they are two digit codes, and will keep repeating, lower numbers first and in succession, over and over while in diagnostic mode. Maybe an idle sensor fault will show up.
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Make the FixYa experience better for everyone by voting.
Hi,
Check the entire fuel delivery system.
  • Relieve system pressure. Disconnect the negative battery cable and loosen the gas cap to let pressure drain from the system. Attach a dual tube pressure gauge to the test port and drain fuel into an approved container.
  • Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
  • Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve if one is not already connected. Reconnect the negative battery cable and turn the key to the first position. Do not start the engine.
  • Check the pressure gauge. It needs to register between 45 and 48 psi. Start the engine and let it idle. Check the gauge again. It needs to register approximately 46 psi. Leave the engine on and remove the vacuum hose. Check the gauge one last time. It needs to register approximately 50 psi. Pressure that's too high indicates a malfunctioning pressure regulator. Low pressure indicates a clogged fuel filter or a broken fuel pump that needs to be replaced.
  • Cut the engine off, relieve system pressure again and remove the negative battery cable.
  • Clean the fuel filter inlet with compressed air to remove any dirt that might come loose and contaminate the fuel supply as you remove the fuel filter. Pull the filter out at the male filter fitting and disconnect the remaining connections to the filter. Remove the filter.
  • Examine the filter for clogs and replace it if necessary. If there are no clogs, the fuel delivery problem is probably caused by a breakdown in the fuel pump itself.
DO NOT RUN OUT AND BUY ANYTHING YET! This was only the opening act.

All of the above systems are monitored by GM Powertrain Module (a.k.a. on-board computer). A diagnostic scan retrieves any inform related to the malfunctioning parts and tells you precisely what is wrong. Perform the scan diagnostic now.
Start the car and perform another scan. The reason we rescan and repair non-related codes after the engine is running is because sometime false codes can be triggered by the engine not running. Once the engine is running again the code present might cycle and turn itself off. You might say "if the engine doesn't run shouldn't it have a trouble code?" Sometimes conditions occur that will not be detected by the computer, e.g.,if the fuel pump fails the computer cannot detect the failure, so the engine doesn't start and the computer thinks everything is okay with no codes. If no trouble codes are present proceed to the next step.
If you have trouble using the code scanner or interpreting the codes click on the following link and use my access code (carrepair): Free Automotive Repair information for Users of a Code Scanner
I know that the above is wordy but I wanted to do more than just tell you that your problem is complex.
All the best,
Ben

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1 Answer

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See also: P0300 diagnostic code @ OBD-Codes.com
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Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
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Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
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Ignition module or related wiring issues
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1 Answer

Service engine light is on, and truck has no power going up the slightest grade, and is very sputtery. When going up a hill, the air conditiner stops blowing cool air, it's more like engine air, kind of...


When your vehicle has low power output it can mean several different things are occurring. You should know while your car has low performance it could be damaging components while you drive. Example: The emergency brake is on and you did not notice, this condition will burn up the rear brake pads or shoes and cause premature emergency brake failure. Or, the fuel filter is clogged causing thefuel pump to labor which can cause premature fuel pump failure. There are basically two kinds of low power conditions either the engine is running rough causing low power or the engine is running smoothly but still has low power. If the engine is running smoothly but has low power you are in the right place.
Step 1 - Scan for Trouble Codes - Check to see if the "service engine soon" light is on, if not continue to the next step. If the "check engine" (same thing as a service engine soon light, different manufacturers call it different things) light is illuminated you need to have the computer scanned for trouble codes. Use a simple scanner tool to retrieve trouble codes and check if they relate to the specific problem, like a fuel pump circuit failure code. If a trouble code is present but does not pertain to the immediate problem like an EVAP code ignore it until a later time, after the engine is running properly. The reason we repair non-related codes after the engine is running properly is because sometime false codes can be triggered by a poorly running engine. Once the engine is running properly the code present might cycle and turn itself off. You might say "if the engine isn't running right shouldn't it have a check engine light and a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the intake or exhaust valve operation fails the computer cannot detect the failure because the problem is not sensor related, so the engine has no power and the computer thinks everything is ok with no codes. If the trouble code retrieved relates to a low power like a Mass Air Flow (MAF) sensor or ignition coil system failure repair these problems and re-test system. If no trouble codes are present proceed to the next step.
Step 2 - Check the Air Filter - A plugged air filter not allowing the proper amount of air into the engine. If air is not allowed to enter the engine's intake it will limit the engine power output. To check your engine air filter open the hood and remove the air filter from its housing and inspect, replace as needed and recheck.
  • Step 3 - Check the Fuel Filter - Several conditions can cause low power, one of the most common reasons is a clogged fuel filter not allowing the proper amount of fuel pressure and volume into the fuel injection system. To check for this condition remove the fuel filter and drain excess fuel from the filter, next wipe any excess fuel from the filter. By blowing through the filter you can determine if the filter is clogged, you should be able to blow through it very easily. If you cannot blow through it or it is difficult replace the fuel filter with a new unit and recheck system. Some fuel filters utilize a special release tool available at our tool store: Fuel filter release tool, if the fuel filter is ok proceed to the next step.
  • Step 4 - Check Fuel Pump Pressure and Pressure Regulator - Fuel pump is worn providing low fuel pressure to the fuel injection system. A fuel pump that is faltering providing low system fuel pressure/volume will cause low power. Your car's engine depends on constant fuel under pressure to supply the fuel injection system properly. Your car's fuel pump performs this action and is located in or near the gas tank. The injection system meters fuel through the injectors and into the engine. Many engine run drivability problems can be related to a weak or failing fuel pump. Problems can range from hard starting in the morning, low power and stalling while driving. Most vehicles have a fuel pressure test port somewhere on the fuel rail, use a flashlight to locate it on your engine or consult a repair manual. Also test the fuel pressure regulator performance; if the regulator is stuck or leaking the engine will not receive the additional fuel needed for power. If the fuel system pressure is ok proceed to the next step.
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Jul 09, 2009 | 2001 Ford Expedition

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