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S10 pickups. 2003 fuel trouble shooting - Cars & Trucks

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  • Chad Akers Nov 02, 2012

    Year? Engine? What are you trying to troubleshoot? No start? No fuel pressure?

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  • Cars & Trucks Master
  • 76,846 Answers

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

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SOURCE: I need to replace the fuel pump in my 1985 Chevy S10 Pickup.

EXACT PROCEDURE ! Please Rate Me Fairly for this!! Thank you And Good Luck !!


ELECTRIC PUMP

REMOVAL

  1. Before servicing the fuel pump the fuel system pressure must be relieved. See: Fuel Pressure Release
  2. Disconnect the negative battery cable.
  3. Raise the car on a hoist.
  4. Remove the fuel tank. See Fuel Tank / Service and Repair.
  5. Remove the fuel tank sending unit and pump assembly by turning the cam lock ring counterclockwise. Lift assembly from the fuel tank.
  6. Pull the fuel pump up into the attaching hose while pulling outward away from the bottom support. Take care to prevent damage to the rubber insulator and strainer during removal. After the pump assembly is clear of the bottom support, pull the pump assembly out of the rubber connector for removal. NOTE: Inspect the fuel pump attaching hose for any signs of deterioration. Also check the rubber sound insulator at the bottom of the pump. Replace damaged or deteriorated parts.
INSTALLATION
  1. Push the fuel pump assembly into the attaching hose.
  2. Position the fuel tank sending unit and pump assembly into the fuel tank. Use a new "O" ring seal. NOTE: Care should be taken not to fold over or twist the strainer when installing the sending unit as this will restrict the flow of fuel. Also, verify that the strainer does not block the full travel of the float arm.
  3. Install cam lock over the assembly and lock by turning clockwise.
  4. Reinstall fuel tank.
MECHANICAL PUMP

REMOVAL and INSTALLATION

NOTE: To ease pump installation, rotate the camshaft so the camshaft eccentric is out of the way of the fuel pump rocker arm.

  1. Disconnect fuel lines from fuel pump.
  2. Remove fuel pump mounting bolts and the fuel pump.
  3. Remove all gasket material from the pump and block gasket surfaces. Apply sealer to both sides of new gasket.
  4. Position gasket on pump flange and hold pump in position against its mounting surface. Make sure rocker arm is riding on camshaft eccentric.
  5. Press pump tight against its mounting. Install retaining screws and tighten them alternately.
  6. Connect fuel lines. Then operate engine and check for leaks.

Posted on Mar 22, 2009

  • 784 Answers

SOURCE: how to trouble shoot air condition compresuer

You really want to troubleshoot your AC. Here are some items to follow:
1- Make sure your Compressor clutch work first. You can jump the wire to test it when the engine is off.
When you know the clutch work then you can look for the other things not makeing it activated.
2- It it doesn't work then you know the problem right there.
3- If it works then check the Low and high pressure according to compressor spec.
3- Check your engine temperature sensor. Don't think that your temp reading gauge is coorect then your engine temperature for your AC is working.
4- Check your compressor sensor speed. It has to be in sych with your crankshaft sensor before it allows the clutch engaged to prevent burning your compressor when it is locked up is in freezing mode ( ex.in case some clever people jumping wire to control the clutch bypassing all other rerquirement).
5- If you think these items need to be addressed by professional better then do-it yourself then I have no objection. Good luck on trying.

Posted on Jul 09, 2009

  • 3074 Answers

SOURCE: Trouble shoot S10 (2.5lt) 1987 no start fuel

fuel relay(under hood black square, should click when ignition is turn on) fuel lines, fuel filter(under driverside back of door inside frame) or fuel pump on top of tank. I would disconnect the fuel filter on the backside to see if the pump is pumping fuel, if it is then I would hook it back up and remove the front hose on the filter, if fuel is coming through then I would disconnect the line at the engine and check for fuel, hope this helped Tim

Posted on May 29, 2011

wyet_helps
  • 339 Answers

SOURCE: 2003 Sierra Pickup 4.8 V8, oil pressure reading

{: ) The engine oil pressure sensor is on the left rear side of the engine block. Remove first the intake manifold sight shield (cover). The 3 wires all go to the powertrain control module (PCM).
Black = low reference ; Gray = 5v reference ; Tan/White = oil pressure signal.


wyet_helps_19.gif On the other hand, the oil level sensor has two wires; Black/White = ground (G103); Brown = oil level signal going to the PCM. See sample diagram below:

wyet_helps_20.gif The PCM monitors the input signals coming from these two sensors, and it will communicate to the cluster (IPC) through Class2 serial data line. The IPC will then indicate the corresponding values on the pressure gauge and will also indicate a warning lamp or message when necessary.

Posted on Aug 04, 2011

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fuel relay(under hood black square, should click when ignition is turn on) fuel lines, fuel filter(under driverside back of door inside frame) or fuel pump on top of tank. I would disconnect the fuel filter on the backside to see if the pump is pumping fuel, if it is then I would hook it back up and remove the front hose on the filter, if fuel is coming through then I would disconnect the line at the engine and check for fuel, hope this helped Tim

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