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post #1 of 12 Old 8th September 2015, 06:19 PM Thread Starter
bhemi
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P1342

I've been getting a P1342 "misfire on cylinder #1 on start" code on my car. It runs okay above 2500 RPm but on start it takes a minute to idle below 1,000 RPM and has a "lumpy" idle. It doesn't start to pull hard until above 2500. I have replaced the intake CPS on bank #1 and put new plugs ins.

Research on the web got me the malfunction criteria for this code and it's "FTP emissions threshold number of exceedence >> once within the first 1000 revolutions after engine start.

I recently replaced the flex disc, transmission mounts and centering bushing. when I dropped the exhaust I unscrewed the O2 sensors and zip tied them out of the way. I'm wondering if they could have been damaged and would it throw this code? Car has 145,000 km.

Also, if I swap coils with another cylinder in the same bank is that a good test for a bad coil pack?
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post #2 of 12 Old 8th September 2015, 07:45 PM
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It's not likely the O2 sensor, those are testing the efficiency of the combustion process (rather than the ignition within a certain cylinder).

I think your hunch is right on, move the ignition coil to another cylinder...if the fault changes to that cylinder you have your answer

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post #3 of 12 Old 8th September 2015, 10:59 PM
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O2 sensors are bank specific but not cylinder specific so the answer to the first question is no.
Misfire on one cylinder during startup...... you would never even notice this if it wasn't for the code.
Symptoms sound like CPS or VANOS. Normally it is recommended to change out all 4 CPS and do standard VANOS maintenance.

Last edited by xrviz; 8th September 2015 at 11:04 PM.
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post #4 of 12 Old 9th September 2015, 12:11 AM Thread Starter
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Can you point me to a post on VANOS maintenance? I will try the coil swap and then change the exhaust CPS on bank one.
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post #5 of 12 Old 9th September 2015, 12:34 AM
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Look in the DIY sticky under vanos solenoid. But do only one thing at a time. Switch the coils if you like and drive the car for a couple days and check for codes. Then change the other CPS and drive it. Etc.
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post #6 of 12 Old 6th October 2015, 01:43 AM Thread Starter
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Update

I switched coil packs with Cylinder #1 and #2 Ran great and now it's back to same old symptoms just less severe. I thought it might be a fuel issue and replaced the filter. My OBD reader is giving same code but my Peak Reader is giving Table 18 #69 "Engine coolant temperature, Plausibility. It is also throwing #68 but that's a memory code I feel is because I keep erasing the codes.
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post #7 of 12 Old 6th October 2015, 04:52 AM
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If you changed the flex discs and did tranny mounts, did you ensure that you put the O2 sensor cables back behind the heatshields before you put the exhaust back up and sensors back in?

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post #8 of 12 Old 6th October 2015, 02:39 PM
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I think there is some info you don't have. First thing you should know is the exhaust CPS are likely more important than the intake CPS. The exhaust CPS set the volume of EGR the intake only facilitate the transfer.
The other thing you need to know is your misfire is a different misfire than you likely think. During the startup the ignition fires on every rotation of the engine. So once for ignition and then once on the exhaust stroke. That code means that the misfire was on the exhaust stroke. What that means is you have incomplete combustion do to a bad fuel mix. This could be because of fuel but also the wrong volume of exhaust maybe going in which means the air volume is wrong. This is why you make sure the Vanos is correct.

You seem to get the same misfire all of the time, with vanos problems you can see more random misfires but not always. You have changed the coil but not really. You needed to switch 1 with 3. 2 fires right after 1 so is a poor choice for the change. Misfire detection on this car does not always get it right, sometimes it guesses at the wrong cyl. Switching it to 8 would be the best but that is on the other bank, 3 does almost the same thing.

Is the Peake tool giving you a misfire code? The 69 code is significant and if your sensor is at fault then that could play a role in what is going on, but it is rarely the sensor. You should do the diagnosis on that system. There are a lot of threads on the 69 code, no sense in talking about it here unless you run into problems. The 68 does not come up from clearing the codes. I don't think I have ever seen it reported. In fact it is not even listed in table 18, are you sure it is not 6B?

Last edited by Sailor24; 6th October 2015 at 02:39 PM.
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post #9 of 12 Old 6th October 2015, 08:04 PM
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post #10 of 12 Old 6th October 2015, 09:31 PM
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