Question about 2000 Buick LeSabre

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Car had a new intake manifold assy and ignition module installed after a month, the #6 cylender is miss fireing and the engine is running too rich. The machinic did alot of tests and checks but he said it is still running only at 99%

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  • Anonymous Mar 14, 2011

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You need to have an OBII scan done (fault scan) that will identify what's is causing your issues. Autozone, Advance, auto parts can do this for you for FREE. Get the list of faults and have your mechanic address what computer has tracked.

Posted on Mar 14, 2011

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Could have a vac leak or intake valve problem.
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I have problem with my Corvette C4 L98. Engine running bad but only sometimes maybe in cold and warm condition. Feels like running on 4 - 7 cylinders. All checks done as discribed in manual. No failures in...


I would check out a) all vacuum pipes from your intake manifold for cracks etc. b) fuel pressure regulator (FPR) valve and your ignition coil. The function of these last two is not overseen by the engine ECU and if they are not behaving then you are the best diagnostic. Any small air leak into a vacuum pipe will compromise the intake manifold pressure management and the car will run roughy. The FPR is a small metal circular device and sits on the fuel rail; it has a vacuum pipe attached to it. Sometimes if the FPR is failing there smell of fuel from the vacuum arm when disconnecting the small diameter vacuum pipe. If the FPR leaks it makes the engine run richer than it should and the consequence is the ECU then alters the engine management to cope. This can lead to non-fire events and occasionally miss-fire as the engine goes from rich to lean and back again: basically mirroring the same events as with the cracked vacuum piping (above). Finally check that you are getting a good consistent spark on all plugs. Now check the resistance of each spark plug lead, they should all have high resistance but anything that looks extreme, compared to the rest, should be replaced. Remove the coil and give it a really good inspection, check for any cracks or obvious signs of shorts. Sometimes an intermittent short in the low tension coil side is really hard to detect but it will give rise to non-fire events. I keep stressing 'non-fire events' (or failure to fire) as miss-fire (out of time firing)) is often detected by the knock sensor etc.

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1996 gmc ck1500 4.3 liter fuel injector system. How does it work? The engine misses irradically when running and suspect fuel injectors are not working correctly. How can we varify that and what needs to...


Did you check for ignition miss first? Check spark plugs and see which ones are firing correctly and which ones aren't. Did this vehicle ever overheat in the past? If so, that could be the biggest problem right there. If it did overheat, the fuel lines under the intake manifold can melt resulting in cylinders not working properly.

The injection system sits under the intake manifold and it works by supply and demand. Piston goes down and that opens the poppet valve to let the fuel flow into the cylinder. When the piston goes back up, it closes the valve. 9 times out of 10, there's dirt in those poppet valves, which in turn makes the engine run rich with no control over the fuel.
Advise to check the fuel pressure regulator too.


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Note, removing the upper intake manifold is not necessary when removing lower intake manifold, they are removed as an assembly.
Disconnect negative battery cable. Drain cooling system. Remove air cleaner assembly and inlet duct. Mark and remove distributor. Remove upper radiator hose at thermostat housing. Disconnect accelerator and cruise control cables. Remove heater hoses from intake manifold. Remove EGR pipe.
Disconnect fuel lines at rear of engine. Remove AC compressor and set aside(leave hoses connected). Remove canister purge solenoid. Disconnect theSCPI injector, ignition coil, Ignition Control Module, generator,IAC motor, TP sensor, O2 sensor, Exhaust Gas Recirculation valve and Engine Coolant Temperature sensor wiring harness connectors. Remove PCV valve and hose. Remove lower intake manifold bolts. Remove lower intake manifold.
Installation.
Always use New O-rings when reconnecting fuel lines at rear of engine. Apply a bead of RTV silicone sealer along the front and rear sealing surfaces of the block.See Fig.6. Install new gaskets and intake manifold on block while RTV is still wet to the touch. Use Threadlock 12345382 or equivalent to lower intake manifold bolts. Tighten lower intake manifold bolts in sequence to specification table. See fig. 7. To complete installation, reverse removal procedure.f52665d.gifabc2b5f.gif

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I need the diagram to put the spark plug cables


2003 Chevrolet Malibu 3.1L SFI OHV 6cyl
Spark Plug Wires - Removal & Installation

3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
  2. Remove the intake manifold cover, if required.
  3. Disconnect the left side spark plug wires from the spark plugs.
  4. Disconnect the left side spark plug wires from the ignition coil.
  5. Remove the spark plug wire clips from the Manifold Absolute Pressure (MAP) sensor bracket and the heater inlet and outlet pipe tab.
  6. Remove the spark plug wire assembly.
  7. If replacing only one plug wire, open the retaining clips and remove the appropriate spark plug wire.
  8. Disconnect the right side spark plug wires from the spark plugs.
  9. Disconnect the right side spark plugs from the ignition coils.
  10. Remove the spark plug wire assembly.
  11. If replacing only one plug wire, open the retaining clip and remove the appropriate spark plug wire.
To install:
  1. Install the spark plug wire assembly.
  2. Connect the right side spark plugs to the ignition coils.
  3. Connect the right side spark plug wires to the spark plugs.
  4. If replacing only one plug wire, open the retaining clip and install the appropriate spark plug wire.
  5. Install the spark plug wire assembly.
  6. Connect the left side spark plug wires to the spark plugs.
  7. Connect the left side spark plug wires to the ignition coil.
  8. Install the spark plug wire clips to the MAP sensor bracket and the heater inlet and outlet pipe tab.
  9. If replacing only one plug wire, open the retaining clips and install the appropriate spark plug wire.
  10. Install the intake manifold cover, if required.

Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system
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Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
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Fig. 3.5L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
9313fa7.jpg


Fig. 2.4L Engine Firing order: 1-3-4-2 Distributorless ignition system
2c9af72.jpg


Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
d929c16.jpg


Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system
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Fig. 3.5L & 3.9L Engines Firing order: 1-2-3-4-5-6 Distributorless ignition system
09e9db9.jpg

I really hope help you with this (remember rated this help) Good luck.

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Runs rich and miss fires


Make sure the spark plug wires are on right (propper firing order), and check the TPS sensor. Are there any exhaust leaks or vacuum leaks? Did you use the original intake manifolds and Holley throttle body? If not you need to replace the PROM chip with the one from the donor car.

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