Cylinder 3 and 4 misfire - Lexus IS Forum
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post #1 of 11 (permalink) Old 12-19-2017, 01:02 PM Thread Starter
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Cylinder 3 and 4 misfire

Hello everyone,

I just did the timing belt on my 05 IS300. Timing belt, water pump, thermostat, o-rings, tensioner, pulley, valve cover gaskets, spark plugs, and a lot of the vacuum lines were all replaced. Before the engine was starting rough and giving cylinder misfire codes. Two days after the job it is starting rough again. When I took the throttle body off I could see a collection of oil in the valley between the valve covers. When I pulled the plugs out the boots were wet, and half the plugs were wet. I wiped everything down when changing the plugs.

Any ideas what could be causing the misfire? Should I do new coils? Any help is much appreciated!


Doug
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post #2 of 11 (permalink) Old 12-19-2017, 02:24 PM
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Originally Posted by sardis333 View Post
Hello everyone,

I just did the timing belt on my 05 IS300. Timing belt, water pump, thermostat, o-rings, tensioner, pulley, valve cover gaskets, spark plugs, and a lot of the vacuum lines were all replaced. Before the engine was starting rough and giving cylinder misfire codes. Two days after the job it is starting rough again. When I took the throttle body off I could see a collection of oil in the valley between the valve covers. When I pulled the plugs out the boots were wet, and half the plugs were wet. I wiped everything down when changing the plugs.

Any ideas what could be causing the misfire? Should I do new coils? Any help is much appreciated!


Doug
Could be anything but a few things to check.

When you did the timing, did you do the crank seal? You may have bent the timing teeth for the crank position sensor. If the car was rough idle right after the timing job it's possibly a bent tooth due to not removing the guard.

Did you properly set the VVTi gear?

When removing the coil packs, did you replace the boots / wires / plugs? You may have a loose/broken clip on the coil packs. Did you reconnect the spark plug wires properly? Since you are getting a miss fire on 3/4 this would make sense as the firing order is 1-5-3-6-2-4, with each coilpack doing 1/6, 2/5, 3/4.

Try to swap coil packs and see if 1/6 start miss firing.

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post #3 of 11 (permalink) Old 12-19-2017, 02:38 PM Thread Starter
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I did not break any teeth, I was sure to remove the guard first. And in fact the person before my bent the guard so I straighten it back out. No teeth were missing. I did replace all three seals. I know the plug wires went back on correctly because I did one plug at a time. A bad coil pack is very possible. I will look at swapping or even replacing the coil packs.

Thank you!
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post #4 of 11 (permalink) Old 12-19-2017, 04:18 PM
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if theres oil in the spark plug wells you need to change the rocker cover gasket.

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post #5 of 11 (permalink) Old 12-19-2017, 08:52 PM Thread Starter
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What and where is the rocker cover gasket?
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post #6 of 11 (permalink) Old 12-19-2017, 10:59 PM
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I'm old so im used to the old school engines with side cams and rockers and all the terminology that goes along with it :D
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post #7 of 11 (permalink) Old 12-20-2017, 10:13 PM Thread Starter
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Ah yes, the valve cover gaskets. Yes, both if those gaskets are new. I just pulled the plastic cover off the top as well as the timing belt cover on top to look inside the valley between the valve covers and they look dry, no leaks.

What is weird is the car ran great for a day and a half, then all of a sudden started acting up again. If it sits for any period of time and gets cold it has a misfire on start up and acts like it is going to die if driven right after starting up. Once it warms up it drives good. I am about to lose it with this car....
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post #8 of 11 (permalink) Old 12-26-2017, 06:14 PM Thread Starter
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So I have not had a chance to mess with the plug wires and coil packs yet, but now the car is taking a while to start. One day it drives fine, the next it takes several cranks to get it started.

Could there be a bad injector? Or still looking at plug wires and coil packs?
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post #9 of 11 (permalink) Old 12-26-2017, 11:46 PM Thread Starter
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Another thought occurred to me, but could a bad fuel filter cause any of these issues?
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post #10 of 11 (permalink) Old 12-27-2017, 07:54 PM
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Did you try swapping the coil packs?

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post #11 of 11 (permalink) Old 12-28-2017, 03:25 PM Thread Starter
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Going to do that today, actually. My ex gf has been driving the car everywhere and has not given me a chance to dig further.
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