Aug 042016

2012 Chevy MalibuDoes this car have a fuel filter and cabin filter?


No Replacement needed for fuel filter. It is an integral part of the fuel pump. No Cabin Air Filter to replace either.

The fuel system is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions.

The fuel tank stores the fuel supply. An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter contained in the fuel sender assembly and the fuel feed pipe to the Fuel Injection System. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cracking times.

Aug 022016

2005 Chevy AveoHey there! I’ve got an odd issue with a 2005 Chevy Aveo with the oil light on. Earlier today I replaced the fuel pump because I was having problems getting it to start and it seems to have done the trick, but now when driving the engine makes a lot of noise when I give it gas and the check oil light comes on even though I’ve checked the oil and it’s fine. It’s got about 123,000 miles on it so I suppose I shouldn’t be surprised, but it seems like it’s another problem altogether. Is it possible that removing the negative battery cable caused a weird electrical quirk when I reconnected everything? Any ideas?


Is it possible that removing the negative battery cable caused a weird electrical quirk when I reconnected everything?

Probably had nothing to do with it. The oil light comes on because of low oil pressure, not because the oil level is low. If the engine is making a knocking noise, the oil pump has gone out. If you drive it or run the engine this way permanent damage will occur. It doesn’t take long either. Just a few miles down the road without oil pressure and the engine is done. The internal components of the engine, specifically the rod and crank bearings, require oil pressure in order to get the oil to the places that need the lubrication it offers.

Oil Pressure Light

Oil Pressure Light
If your vehicle has low engine oil pressure, this light will stay on after you start your engine, or come on when you are driving.

This indicates that your engine is not receiving enough oil. The engine could be low on oil, or could have some other oil problem. Have it fixed immediately by your dealer.

The oil light could also come on in three other situations:

• When the ignition is on but the engine is not running, the light will come on as a test to show you it is working. The light will go out when you turn the ignition on. If it does not come on with the ignition on, you may have a problem with the fuse or bulb. Have it fixed right away.

• If you are idling at a stop sign, the light may blink on and then off.

• If you make a hard stop, the light may come on for a moment. This is normal.

Warning! Do not keep driving if the oil pressure is low . The engine can become so hot that it catches fire. Someone could be burned. Check the oil as soon as possible and have the vehicle serviced.

Caution! Lack of proper engine oil maintenance may damage the engine. The repairs would not be covered by the vehicle warranty. Always follow the maintenance schedule in this manual for changing engine oil.

Jul 292016

Engine Bogs 1998 Chevy SilveradoI have a 5.7 vortex engine that cranks and idles fine. When you try to accelerate the engine  bogs out even all the way to the floor. If you let off, it goes.

Fuel Related issue from the sounds of it. While someone presses the gas pedal and it starts to bog, spray some starting fluid in the air filter. If the engine revs up, you know for certain it is fuel related. Most likely the fuel pump is going out. Fuel pump failure is quite common on these trucks. Of course change your fuel filter at the same time. You may also want to insure the fuel pressure regulator isn’t leaking. Normal fuel pressure should be between 60-66 psi. Use a fuel pressure gauge to check this. When you press the accelerator the pressure should increase. If it drops, the regulator is bad. If the pressure is below normal the fuel pump is shot.

Fuel Pressure Test Kit Gauge 0 – 100 psi

If the check engine light is on, pull the codes and post them below in the comments.

Fuel Pump Replacement 1998 Chevy Silverado when the Engine Bogs

Warning! Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

Fuel Pump 1998 Chevy Silverado


  • Remove the negative battery cable.
  • Relieve the fuel system pressure. Loosen the fuel filter lines
  • Raise the vehicle.
  • Remove the fuel tank.
  • Remove the fuel sender unit assembly by turning the cam lock counterclockwise using tool J 39765 . Or a hammer and straight edge(Screwdriver)

Universal Fuel Pump Removal Tool

  • Disconnect the fuel pump from the sender assembly.
  •    –  Pull the fuel pump up into the attaching hose while pulling outward from the bottom support.
       –  Do Not damage the rubber insulator or the strainer.
  • Inspect the fuel pump attaching hose for signs of deterioration.
  • Check the rubber sound insulation at the bottom of the pump.
  • Inspect the strainer.

Here is a replacement fuel pump. I have double checked to insure it will fit your vehicle.

Installation Procedure

 Connect the fuel pump assembly into the attaching hose.
  1. Install the fuel sender assembly into the fuel tank. Insert a new O-ring seal.
  2. Install the cam lock assembly. Turn the cam lock clockwise to lock it.
  3. Install the fuel tank.
  4. Add fuel removed from the tank.
  5. Check for fuel leaks.
    1. Turn the ignition ON for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Again, turn the ignition switch to the ON position.
    4. Check for fuel leaks.
Jul 292016

2010 Chavy ImpalaCar hardly moves on take off you have to press pedal to floor to get it to barely move, once it gets going drives fine. Until you have to slow below 15 mph. If you try to take off with car in 2nd. its a little better but u can tell car is working really hard. Any suggestions on what could be happening?


My first guess would be some sort of transmission issue. If the engine is revving but the car isn’t going any where, most likely reason would be low on transmission fluid. However, there is a chance you are driving with the park brake on or one of your brake calipers is sticking.

Jul 212016

2008 Chevy ImpalaEngine stall situation. What causes an engine to stall while driving?


Running out of fuel would be the most common for an engine stall issue. This can be a result of a faulty fuel gauge. If the battery light illuminated before hand the issue may be that of a failing alternator. An engine stall situation occurs from computer not having enough juice to operate.

If this is not the case, then diagnostic testing will need to be performed. Determining if the loss of spark, fuel, compression or timing is at fault. And then narrowing down the exact cause of the found related issue. One indicator would be if the check engine light is on. The On Board Computer will store codes related to any failed sensor. Using a scan tool to extract the codes is necessary for this procedure.

Jul 212016

2007 Chevy CobaltMy 2007 Chevy Cobalt 2.2 automatic is showing a random misfire and its making a putt putt sound from tailpipe. It is idling rough and is cutting off when I idle too long. What would be causing this? All my scanner shows is the random misfire on 2007 Chevrolet Cobalt 2.2 automatic.


Chevy Cobalt Check Engine Light

Your vehicle has a computer which monitors operation of the fuel, ignition, and emission control systems.

This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The check engine light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction.

Caution! If the vehicle is continually driven with this light on, after a while, the emission controls might not work as well, the vehicle’s fuel economy might not be as good, and the engine might not run as smoothly. This could lead to costly repairs that might not be covered by the vehicle warranty.

Caution! Modifications made to the engine, transaxle, exhaust, intake, or fuel system of your vehicle or the replacement of the original tires with other than those of the same Tire Performance Criteria (TPC) can affect your vehicle’s emission controls and may cause this light to come on. Modifications to these systems could lead to costly repairs not covered by your warranty. This may also result in a failure to pass a required Emission Inspection/Maintenance test. See Accessories and Modifications .

This light should come on, as a check to show you it is working, when the ignition is on and the engine is not running. If the light does not come on, have it repaired. This light will also come on during a malfunction in one of two ways:

    • Light Flashing  — A misfire condition has been detected. A misfire increases vehicle emissions and may damage the emission control system on your vehicle. Diagnosis and service may be required.


Jul 202016

1988 Chevy S-10I have a 1988 Chevy s-10 v6 2.8l 4×4 ext cab with 120,000 miles on it and no spark. Great truck, daily driver never had a problem with it.  I went to the store, came out and it would not start. It cranked like crazy but would not start. I had it towed home. I got up early took the battery post off and put them back on and the truck fired right up with no problem. It cranked a little longer but it fired up. I cut it off, came back out and it would not fire. So I took a spark plug wire off and noticed it was not getting any fire from the plug wires. So I took the ignition module off and took it to Oreilys and they tested it. They said it was bad so replaced the ignition module and still no fire. Then I replaced ignition coil still no spark. I can hear the fuel pump kicking on but I don’t see gas spraying out of the injectors when I crank the engine. I have not tested for fuel pressure. The only other thing I can think of is it being the distributor cap not getting good fire to the plug wires. Any advice will be helpful thanks.


First thing to check would be the 10 amp ECM 1 Fuse. This fuse when blown would keep the PCM from allowing injector pulse and distributor spark. The 10 amp ECM B fuse if blown would not allow fuel pump operation. If the fuses check out OK then you are left with the Pick up coil in the distributor that signals the ECM and then the ECM itself. Of cousre this is assuming the wiring harness is also GOOD. All of which could cause a no spark situation.

1988 Chevy s10 V6 engine wiring diagram for no spark

The heart of the electronic control system which is found on most vehicles covered by this manual is a computer control module. The module gathers information from various sensors, then controls fuel supply and engine emission systems. Most vehicles are equipped with an Engine Control Module (ECM) which, as its name implies, controls the engine and related emissions systems. Some ECMs may also control the Torque Converter Clutch (TCC) on automatic transmission vehicles or the manual upshift light on manual transmission vehicles. Later model vehicles may be equipped with a Powertrain Control Module (PCM) or a Vehicle Control Module (VCM). Both of these are similar to the original ECMs, but are designed to control additional systems as well. The PCM may control the manual transmission shift lamp or the shift functions of the electronically controlled automatic transmission. The VCM is used to control the manual shift lamp and electronic brake control functions.

Regardless of the name, all computer control modules are serviced in a similar manner. Care must be taken when handling these expensive components in order to protect them from damage. Carefully follow all instructions included with the replacement part. Avoid touching pins or connectors to prevent damage from static electricity.

All of these computer control modules contain a Programmable Read Only Memory chip or CALPAK that contains calibration information which is particular to the vehicle application. This chip is not supplied with a replacement module and must be transferred to the new module before installation. Late model vehicles equipped with a VCM utilize both a PROM chip and an Electronically Erasable Programmable Read Only Memory (EEPROM) which must be reprogrammed after installation.

To prevent the possibility of permanent control module damage, the ignition switch MUST always be OFF when disconnecting power from or reconnecting power to the module. This includes unplugging the module connector, disconnecting the negative battery cable, removing the module fuse or even attempting to jump your dead battery using jumper cables.

Jul 132016

1999 Chevy CorvetteHi, my 1999 Chevy Corvette stalls when I go in reverse or forward, it idles just fine. It usually happens when I park somewhere uneven. If I don’t use it for a while it works just fine.


There are no recalls or TSB’s for this issue. I would start by pulling any stored codes that may be present. Also try running the fuel out and putting in some high octane from a premium fueling station.

An Ignition control circuit that is open, grounded, or short to voltage will set an ignition control circuit DTC. If a fault occurs in the IC output circuit when the engine is running, the engine will experience a misfire. DTCs P0351-P0358 will set when a malfunction is detected with an Ignition Control circuit. When an Ignition control DTC sets, the PCM will disabled the injector for the appropriate cylinder.

The Chevy Corvette PCM uses information from the engine coolant temperature sensor in addition to RPM to calculate spark advance values as follows:

  • High RPM = more advance
  • Cold engine = more advance
  • Low RPM = less advance
  • Hot engine = less advance

Therefore, detonation may be caused by high resistance in the engine coolant temperature sensor circuit. Poor performance may be caused by low resistance in the engine coolant temperature sensor circuit.

If the engine cranks but will not run or immediately stalls, Engine Cranks But Will Not Run diagnostic table must be used to determine if the failure is in the ignition system or the fuel system. If DTC P0300, P0341, P0342, P0343, P0335, P0336 is set, the appropriate diagnostic trouble code table must be used for diagnosis.


 Never pierce a secondary ignition wire or boot for any testing purposes.

Be careful not to damage the secondary ignition wires or boots when servicing the ignition system. Rotate each boot to dislodge it from the plug or coil tower before pulling it from either a spark plug or the ignition coil. Future problems are guaranteed if pinpoints or test lights are pushed through the insulation for testing.

Jul 112016

2007 Chevy 1500I have Code P0641 on my 2007 Chevy 1500, Where should I start?


Check your connections at the computer and the wiring harness. If all checks out you will most likely need to replace the ECM itself.

P0641 CHEVROLET – 5 Volt Reference Voltage Incorrect

The control module has 2 internal 5-volt reference buses called 5-volt reference 1 and 5-volt reference 2 . Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.

When is the code detected?
The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower than expected
Code P0641 Possible causes
– Faulty Engine Control Module (ECM)
– ECM harness is open or shorted
– ECM circuit poor electrical connection
– Shorted sensor on 5 volt circuit

ECM – Engine Control Module Replacement 2007 Chevy 1500

Jul 072016

1994 Chevy 6.5 turbo dieselWould a bad vacuum pump make the pickup spit, sputter, smoke and loose power. Or is it the catalytic converter?



The vacuum pump on the 6.5L engine provides vacuum for operating emission controls, cruise control and heater and A/C servos.

That being said, I do not think the vacuum pump has anything to do with the engine spitting and sputtering or the loss of power.

If the catalytic converter was clogged, it could cause the issues you are having.