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Discussion Starter #1 (Edited)
Hello,

Well, long story short, the timing belt tensioner went out, which caused engine failure so I decided to have a JDM swap done. While my wife was driving home on the freeway she noticed that the check engine light flashed, so she pulled over. I drove to where she was and pulled the codes. The only code was P1399 for multiple cylinder misfire (pending). I did some research and most of those codes are typically present with other misfire codes, however, this one wasn't. I checked the coils and pulled each one and noticed a slight change in RPMs to rule out a bad coil pack. Does anyone else have any idea? Should I go back to the shop that did the swap or does this sound like something other than an issue with installation? I would like to add that prior to the install we did not notice any flashing check engine light.

EDIT: I decided to drive around to see if any other codes were present and now the check engine light came on with the VTM-4 light. The codes present are P0300, P0301, P0304 and P1399 (pending).

Thank you!

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Did you install new and correct NGK spark plugs that were not sourced from amazon?

Was the EGR valve replaced?
 

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Discussion Starter #3
The NGK plugs from the JDM engine were kept due to the fact that the mechanic had stated that they looked fine and I used cheap Bosch plugs in the original engine just to see if that was the reason the engine was not starting (prior to swap) so I didn't want to use those. This was a straight swap and the only things that I had him do were swap out the seals and intake manifold.

I did see that the EGR could also be an issue, but considering that he swapped out the intake manifold for ours and we didn't have a code (that we noticed) we didn't think that would be the issue. The light is off and we only knew it was there because it flashed on the freeway. The idle also sounds good and not rough.

Edit: I didn't see any mention of an EGR valve on this motor... only that the EGR ports run along underneath the intake manifold. Unless I'm wrong.

Thanks!

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I got a similar code on my 2008. I cleared the code, and it hasn't come back since. That was about 3,000 miles ago. I suppose it could need a valve adjustment (that is what people suggested to me when I had 1-6 misfire and a random as well). Everything is working fine so I'll wait until it comes up again before I do anything. :)
 

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Discussion Starter #5
Ok, an update. I now have P0300, P0301, P0304 and P1399 (pending). I'm leaning towards valve adjustment, but I'm not sure why since the motor should only have 60k miles and the adjustment isn't recommended until 100k.

Ideas welcome.

Thank you!

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What year is yours? FWD or AWD?
 

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Hello,

Well, long story short, the timing belt tensioner went out, which caused engine failure so I decided to have a JDM swap done. While my wife was driving home on the freeway she noticed that the check engine light flashed, so she pulled over. I drove to where she was and pulled the codes. The only code was P1399 for multiple cylinder misfire (pending). I did some research and most of those codes are typically present with other misfire codes, however, this one wasn't. I checked the coils and pulled each one and noticed a slight change in RPMs to rule out a bad coil pack. Does anyone else have any idea? Should I go back to the shop that did the swap or does this sound like something other than an issue with installation? I would like to add that prior to the install we did not notice any flashing check engine light.

EDIT: I decided to drive around to see if any other codes were present and now the check engine light came on with the VTM-4 light. The codes present are P0300, P0301, P0304 and P1399 (pending).

Thank you!

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you really can't rule out coil on plug packs like that, you need a in line spark tester to see if you get erratic spark when rpms change.
 

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Discussion Starter #10
2003. From what I have read it is AWD, but the AWD doesn't engage until it detects slipping or if you are in one of the lower gears and switch it on.

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It was a reputable shop, but they only listed it as a J35 and all the years/models that it would fit, not what it was pulled from.

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They should have more detail about the engine cause 1 there are no jdm pilots as they were built here and canada, also pilot have an A motor and Z1 motor, run the vin on the engine block and see what it came out of.
 

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Discussion Starter #14
They should have more detail about the engine cause 1 there are no jdm pilots as they were built here and canada, also pilot have an A motor and Z1 motor, run the vin on the engine block and see what it came out of.
Not doubting you, but genuinely curious. Why would the type of motor make a difference? We were first given a motor from a newer model, but the mechanic noticed that the connectors were different so we returned it to the same shop and given this one, which the mechanic never mentioned that something didn't fit as it was supposed to.

Thank you!

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Not doubting you, but genuinely curious. Why would the type of motor make a difference? We were first given a motor from a newer model, but the mechanic noticed that the connectors were different so we returned it to the same shop and given this one, which the mechanic never mentioned that something didn't fit as it was supposed to.

Thank you!

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the A motor is for AWD and the Z is for fwd also it has VCM and the A motor does not, these motors are not direct swaps unless its pulled from the same vehicle, the plugs might look the same but might the ecu might be seeing something else.
 

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How many days/miles did you put on before you threw a code? I'd think any codes from a ECU mismatch would throw pretty quickly.

On the engine - there are many J35 engines with differences.


The correct ones for the 2003 would be J35A4. Just saying "J35A" is not specific enough. However, the JDM selling company should have been able to cross reference what you needed and make sure you got a compatible engine.

A lot of people say they swap the sensors from the old engine. I'd be inclined to swap a lot of the parts from the old engine, and just keep the JDM parts for spares.
 

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Discussion Starter #17
My wife drove about 18 miles from the mechanic shop before she noticed the light flash and I'm unsure how many miles the mechanic put on it. I reset the light on the freeway and my wife drove it home around 8/9 miles. The light wasn't on, but I decided to check anyways. There was a code P1399 (Pending) only, but with my research found out that this code was normally with other misfire codes. I wanted to put some more miles on the car to see if there might be other codes present, so I drove it around 2 additional miles and noticed that the check engine light was now on along with the VTM-4 dash light.

Thanks for your help!

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My wife drove about 18 miles from the mechanic shop before she noticed the light flash and I'm unsure how many miles the mechanic put on it. I reset the light on the freeway and my wife drove it home around 8/9 miles. The light wasn't on, but I decided to check anyways. There was a code P1399 (Pending) only, but with my research found out that this code was normally with other misfire codes. I wanted to put some more miles on the car to see if there might be other codes present, so I drove it around 2 additional miles and noticed that the check engine light was now on along with the VTM-4 dash light.

Thanks for your help!

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You should take it back to who put it, unless you didn’t pay for service, if he is as good as you advertised he should fix your problem with no issue, I don’t recommend trying to remedy yourself cause you don’t wanna open Pandora’s box and end up buying another motor.
 

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without a scan tool there is no way to reset the check engine light on the fly something doesn't add up here..check engine light don't flash they stay off or stay on there is no in between.
 

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Discussion Starter #20
I have an OBD scan tool that I keep in my car for instances like this, so that's how I reset it. With my research, I have found a few instances where the light flashes while showing code P1399.

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