Intermittent rough engine and misfires both in idle and while driving, codes P0305 and P0300

Tiny
KASEKENNY1
  • EXPERT
Okay. Clearly if the code for the injector comes back then we have a circuit issue but this matched with the P0300 would make sense if we have some leaking injectors. So replacing all of them was probably a good call.
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Wednesday, July 22nd, 2020 AT 5:14 PM
Tiny
NYC2NC82@GMAIL.COM
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Well, all I m getting is the injector circuit code and p0300 now. Have not had the 305 come back since the change. I start off pretty good, at this point it s happening when it pretty hot out and after driving for a bit and stopping. I m guessing I have something shorting when it gets hot but not sure where to start looking.
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Wednesday, July 22nd, 2020 AT 5:28 PM
Tiny
KASEKENNY1
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Agreed. If the injector circuit code is back then we need to run through that testing and find it but I would not be surprised if the injector harness is the issue as I have seen that a number of times on 4.7L.
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Wednesday, July 22nd, 2020 AT 6:40 PM
Tiny
NYC2NC82@GMAIL.COM
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I was thinking about the harness in general since I ve have the codes on different cylinders. How bad is it to get that done?
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Wednesday, July 22nd, 2020 AT 6:46 PM
Tiny
KASEKENNY1
  • EXPERT
It is not bad. The manuals don't actually list a process for this however I attached the illustration of it. Just follow the harness from the PCM down over the engine to the injectors. Not much has to come off to remove it as it has the wiring cradles that hold it in place.
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Wednesday, July 22nd, 2020 AT 7:05 PM
Tiny
4DRTOM
  • EXPERT
Hi Guys,

So in this issue the most consistent part is heat. The hotter it gets the worse it runs, Maybe we are looking at situation that the car is in fact getting to hot but not enough to cause the normal symptoms like the gauge reading hot, steam blowing out and so forth. Did you change the temperature sensor? Do you have or can you get a laser no touch temperature gauge? The type that you point the laser on a surface and can read its temp at the dot. I don't think there very expensive and AutoZone has a good loaner program. Next time you go out and it hot and you have run it to the point that its acting up take a bunch of readings to what you can get well. We want to know the temperatures at the front and the rear of the heads, the water pump, the block and the intake manifold where it meets the head. It's worth a shot to check.
Tom
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Friday, July 24th, 2020 AT 10:46 PM
Tiny
NYC2NC82@GMAIL.COM
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I ll look into it. I have been making efforts to allow the heat to escape the engine bay and as of now I m only getting it to happen when it s really hot out and driving for a little and coming to a stop.
Other day it was okay while on the highway, once I got to a start and stop situation (stop signs and lights not traffic) it started getting bad and I pulled over and restarted but it was about 100 out. Same drive back in upper 70's to mid 80's no issues at all. Drove around just a little yesterday in the 80's, made a few stops and no issues.
I think the injectors have made a difference. The ECT sensor seems to running okay when I look at it on the scanner. Seems to be right around air temperature when starting and goes up while driving. I think the highest I have seen the temperature on that reach is 213.
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Saturday, July 25th, 2020 AT 8:22 AM
Tiny
KASEKENNY1
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Good point Tom.

Sounds good. Keep us posted but if 213 is the highest then that sounds fine.
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Sunday, July 26th, 2020 AT 5:41 AM
Tiny
NYC2NC82@GMAIL.COM
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I ll keep looking at the ECT sensor but it has been consistent around there when I ve checked before.
A little bit cooler yesterday, upper 80's mid 90's on the highway. Did quite a bit of start and stop driving most off the afternoon. Didn t have much issue. No problems at all on the highway. After stopping and restarting not much issue until I started hitting some stop lights but was not awful and was barely doing anything while moving.
I ve been keeping the hood popped and trying to let heat escape the engine bay. In the evening in the 70 s again it seemed to run perfect.
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Sunday, July 26th, 2020 AT 6:55 AM
Tiny
4DRTOM
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Good Morning,

Where was this 213 temperature reading taken from, the block, the head, etc? We want to see if you have consistency temperature wise around the motor. Checking the inlet and outlet of the radiator is good info to have also. I have seen injectors fail in interesting ways. I had one that the closer to freezing the more they failed. If the temperature outside was 40 degrees it was fine, if the temp outside was 35 degrees one injector would leak, if it got down to 32 degrees 2 of them would leak and below freezing all six would leak. Above 45 degrees the car was perfect all summer long. When I brought them into a place that all they did was injectors the guy told me he's never seen anything like it and his feeling was that at one time the car must have gotten so hot that it ruined them and that he was unable to clean or other wise repair them. When I got new ones the entire problem went away, but it was also a temperature sensitive injector failure.
Tom
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Sunday, July 26th, 2020 AT 8:42 AM
Tiny
NYC2NC82@GMAIL.COM
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The 213 was the reading of the ECT sensor on my scan tool. Ordered a thermometer and should have it today. I have already replaced all the injectors.
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Sunday, July 26th, 2020 AT 8:52 AM
Tiny
NYC2NC82@GMAIL.COM
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Okay, picked up my infrared thermometer. Didn t drive a lot but hotter day and got some
sputtering going. Car was sputtering a little when I parked and let it idle and started taking temperatures all over the engine bay. Hottest temperature reading was about 180 and that was the spot in between the alternator and A/C compressor at the top. The injectors and fuel rail were about 150-175 at various points. Pretty much everywhere I could get close and point the beam around the block and manifold it was 150-180 range. Radiator was 95-100 most places I pointed. PCM area got as high as 120. I will say shortly after opening the hood the sputtering stopped and I would guess the temperatures should be higher with the hood shut.
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Sunday, July 26th, 2020 AT 1:19 PM
Tiny
NYC2NC82@GMAIL.COM
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Okay, so I drove for a bit and really let it idle for a good bit while looking under the hood and taking temperatures. Same readings as yesterday for the most part.
I noticed some smoke coming from the driver side close to the firewall. Was hard to tell but looks like it was coming from a hose or wire that connects to what I believe is the purge valve solenoid. I will post pics. Furthermore I took temperatures from the line on one end to the other and it was about 150-160 except for the area that looks like a connector (will post pic as well). The temperature there was reaching up to 400+ degrees. Seemed like it was spiking when I was getting sputters but not 100% sure.
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Monday, July 27th, 2020 AT 1:51 PM
Tiny
NYC2NC82@GMAIL.COM
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Right about where that dot is and on that connector is where the temperatures were spiking into the 400's.
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Monday, July 27th, 2020 AT 1:53 PM
Tiny
NYC2NC82@GMAIL.COM
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This is where it seemed like the smoke was coming from:
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Monday, July 27th, 2020 AT 1:55 PM
Tiny
NYC2NC82@GMAIL.COM
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That connects to this:
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Monday, July 27th, 2020 AT 1:55 PM
Tiny
NYC2NC82@GMAIL.COM
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This was the other spot smoke was possibly coming from, but after a looking for a while it looked like the other spot was most likely.
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Monday, July 27th, 2020 AT 1:57 PM
Tiny
NYC2NC82@GMAIL.COM
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Just got back home. Checked that area again and the temperatures were as high as 560 degrees. Only on that section right before that connector area that connector (if that what it is) itself. Seemed like the temperatures would go up and down. It was as low as 170 at some points and jump right back up. Past the connector and before that small section The temperatures were about 150 range. Also getting p0307 now.
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Monday, July 27th, 2020 AT 7:26 PM
Tiny
4DRTOM
  • EXPERT
Okay, well there is something going on there, 400-500 degrees is pretty hot. Is there any sound like a possible exhaust leak? There might be somewhere in that area an exhaust gas circulating tube that could get that hot, but it would emit enough to make the area hot unless it was leaking. I'm going to see if I can get an image of what I'm talking about. Still though 400-500 degrees is hot. We might be onto something here. From the pic looks like you getting smoke up against the fire wall, Am I seeing that right?
Tom
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Monday, July 27th, 2020 AT 9:54 PM
Tiny
NYC2NC82@GMAIL.COM
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Could not tell if there was a sound or not. Yes, the smoke was by the firewall? Drivers side. It looked like it was coming from that second pic I posted. Those high temperatures see only coming from a small section of that tube.
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Monday, July 27th, 2020 AT 10:46 PM

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