Question about 1998 Buick LeSabre

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My 1998 Buick LeSabre has a misfire on cylinder #1. I have replaced all plugs, wires, all coils, the module, and the fuel injector. Still misfire on #1. Did a compression check and got #1 150 PSI #2 175 PSI #3 195 PSI #4 190 PSI #5 190 PSI #6 180 PSI Any ideas???

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  • jlkinser1970 Feb 01, 2010

    Thanks for the info. Now I am not getting water in the oil so is it safe it assume that the head gasket isn't leaking? If so I will take the head off and have it rebuilt then.

  • jlkinser1970 Mar 31, 2010

    Well I took the heads to a machine shop and found that they had heavy carbon deposits. I don't know if this could cause a misfire or not. Any ideas? I also found a few disconnected ground leads and several burt wires up against the back manifold.



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Hi, I would check for a vacume leak around your intake manifold #1 cylinder runner. You can check by using a stethescope with a small piece of brake line in the end of the hose or spraying propane around the intake. If you hit a vacume leak the RPM will drop. Vacume leakes normaly cause a higher RPM at idle.

Posted on Feb 01, 2010

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Leaking valve or head gasket leaking

Posted on Jan 31, 2010

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Replacement Spark Plugs Continually Misfiring for Cyl. #1

Locate the ignition coils - they are mounted on the ignition module. Remove the wide connector that goes to the module. You will have to unscrew it first. Spray some WD40 on the connector pins and try to scrub them with a tip of a small screwdriver. Be delicate not to brake or bend anything. Reconnect the connector. Start the engine and see if it still misses.
If it still does, try to touch/move each of the wires that go to the ignition module. BE VERY CAREFUL not to touch any of the moving parts of the engine as you have to do it with engine running.

If it still misses, do the following.
1. Engine off
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If it now misses on another cylinder, you will have to buy a new coil.

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P0301 - Cylinder 1 Misfire Detected.

- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

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99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.

Sep 22, 2008 | 1999 Buick LeSabre

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