Engine misfire
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Joined: Mar 2010
Posts: 645
Likes: 151
From: FL
I don't know if it's possible or not on an LS as I haven't changed the plugs yet on my '11, but can the plug/coil wires be reinstalled out of order? This would explain the additional misfires after the new plugs were installed. Whatever the cause, it seems to me the thread starter is lost, just guessing at the problem and throwing $ at it and hoping.
Intermediate
Joined: Dec 2018
Posts: 322
Likes: 30
From: Sharjah
I don't know if it's possible or not on an LS as I haven't changed the plugs yet on my '11, but can the plug/coil wires be reinstalled out of order? This would explain the additional misfires after the new plugs were installed. Whatever the cause, it seems to me the thread starter is lost, just guessing at the problem and throwing $ at it and hoping.
Thread Starter
Driver School Candidate
Joined: Jun 2021
Posts: 23
Likes: 0
From: Dubai
Got the number thank you. It is happening from the last oil gasket changed which was done 6months ago but got worse after the plugs changed
Pole Position
Joined: Aug 2020
Posts: 2,859
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From: NH
Your car needs a proper service! You either need to find a good mechanic or figure it out yourself. By the way, have you cleaned MFCs? Did you make sure that MFCs are connected and installed properly?
Last edited by Anfanger; Jun 22, 2021 at 05:27 AM.
Thread Starter
Driver School Candidate
Joined: Jun 2021
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From: Dubai
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Thread Starter
Driver School Candidate
Joined: Jun 2021
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From: Dubai
Just an update. Today morning I started the car it was making a loud sound from the engine bay like something was slipping or grinding 
guys really I don't know what to do now. I am going to take a car on rent for and park it at some mechanic.
guys really I don't know what to do now. I am going to take a car on rent for and park it at some mechanic.
Thread Starter
Driver School Candidate
Joined: Jun 2021
Posts: 23
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From: Dubai
Intermediate
Joined: Dec 2018
Posts: 322
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From: Sharjah
Thread Starter
Driver School Candidate
Joined: Jun 2021
Posts: 23
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From: Dubai
Thank you for the reply. An update on the whole situation.
Recently I noticed that the it was taking a slow start in the morning. So I changed the battery even the existing battery health was good. So it reset the ECU when we take out the battery for the replacement. The check engine light was gone and car was running smooth for like a day or so and then today check engine light came back on and it started to misfire and stuff and then again after 10mints it was smooth no misfires. So now as I was parking the car the it started again.
So question is can someone place vacuum lines wrong or something. Because when I turn on the ac it seem like it car is trying to bring the Rpm up but it feels like it's struggling with it.
Recently I noticed that the it was taking a slow start in the morning. So I changed the battery even the existing battery health was good. So it reset the ECU when we take out the battery for the replacement. The check engine light was gone and car was running smooth for like a day or so and then today check engine light came back on and it started to misfire and stuff and then again after 10mints it was smooth no misfires. So now as I was parking the car the it started again.
So question is can someone place vacuum lines wrong or something. Because when I turn on the ac it seem like it car is trying to bring the Rpm up but it feels like it's struggling with it.
Thread Starter
Driver School Candidate
Joined: Jun 2021
Posts: 23
Likes: 0
From: Dubai
Thank you for the reply. An update on the whole situation.
Recently I noticed that the it was taking a slow start in the morning. So I changed the battery even the existing battery health was good. So it reset the ECU when we take out the battery for the replacement. The check engine light was gone and car was running smooth for like a day or so and then today check engine light came back on and it started to misfire and stuff and then again after 10mints it was smooth no misfires. So now as I was parking the car the it started again.
So question is can someone place vacuum lines wrong or something. Because when I turn on the ac it seem like it car is trying to bring the Rpm up but it feels like it's struggling with it.
Recently I noticed that the it was taking a slow start in the morning. So I changed the battery even the existing battery health was good. So it reset the ECU when we take out the battery for the replacement. The check engine light was gone and car was running smooth for like a day or so and then today check engine light came back on and it started to misfire and stuff and then again after 10mints it was smooth no misfires. So now as I was parking the car the it started again.
So question is can someone place vacuum lines wrong or something. Because when I turn on the ac it seem like it car is trying to bring the Rpm up but it feels like it's struggling with it.
Did vac check maf changed everything that suggested nothing happened it still runs the same misfires
Today check engine light was gone for an hour and came back when I parked.
I noticed a wired been cut and tapped for passenger side head connector which connects with cam or something can that cause the issue. I find it out when it was done by the guy who put the gas kit. He said the connector was broken and replaced it with one he had in shop now am completely lost
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