Random Misfire 0300: Dealership reflash available...
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Joined: Mar 2005
Posts: 62
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From: Dearborn
Don't you mean "CRANK" angle sensor instead of CAM angle sensor?
Originally Posted by Secret Chimp
Incidentially, I learned what exactly was causing this problem in the first place.
It was the cam angle sensor. It was programmed to be a bit too sensitive. So sensitive in fact that it was 'feeling' the harmonics eminating from the drivetrain. So in certain conditions the cam angle sensor would sense these harmonics and think that the engine is knocking, when it was not really knocking. This would set the ecu into 'engine preservation mode' cutting fuel and timing until the condition cleared up.....hence the engine stuttering we would experience.
SC~
It was the cam angle sensor. It was programmed to be a bit too sensitive. So sensitive in fact that it was 'feeling' the harmonics eminating from the drivetrain. So in certain conditions the cam angle sensor would sense these harmonics and think that the engine is knocking, when it was not really knocking. This would set the ecu into 'engine preservation mode' cutting fuel and timing until the condition cleared up.....hence the engine stuttering we would experience.
SC~
I posted this in another thread:
I am having some trouble with 5th gear operation. Three days ago I want on a 200 mile trip and can back yesterday. The way down was fine but half way back something happened. I stopped to get some gas and when I was merging back on to the freeway once I hit fifth gear the car seemed to stall. It was like you hit a 50 mph head wind and you cannot accelerate anymore. This kept going on for the last 75 miles of the trip. When I look at my boost under normal operation 5th gear, 85 mph, and cruising it’s at about -10 or -15 InHg. When this happens it is between -2 InHg and 5 Psi. If I step on the gas I can get 21 Psi (Vishnu Xede) but the car will not accelerate and the engine vibrates vary badly. I can lay off the gas and get back on it and things seem to clear up for about 10 seconds. Then it happens again. This kept going on for 75 miles. I did pull a check engine light the first time it happened (P0300 Random/Multiple Cylinder Misfire Detected). The only thing I can think of is this. A couple weeks ago I installed new OEM spark plugs and when I pulled the #3 plug wire out of the head it came apart (I think it was #3. it was the one in the middle that has the plastic bracket on it). I put it back together and everything seemed to work fine. I have removed the error code now and it has not happened since. I also have not been in 5th gear as well. Has this happened to anyone else?
I am having some trouble with 5th gear operation. Three days ago I want on a 200 mile trip and can back yesterday. The way down was fine but half way back something happened. I stopped to get some gas and when I was merging back on to the freeway once I hit fifth gear the car seemed to stall. It was like you hit a 50 mph head wind and you cannot accelerate anymore. This kept going on for the last 75 miles of the trip. When I look at my boost under normal operation 5th gear, 85 mph, and cruising it’s at about -10 or -15 InHg. When this happens it is between -2 InHg and 5 Psi. If I step on the gas I can get 21 Psi (Vishnu Xede) but the car will not accelerate and the engine vibrates vary badly. I can lay off the gas and get back on it and things seem to clear up for about 10 seconds. Then it happens again. This kept going on for 75 miles. I did pull a check engine light the first time it happened (P0300 Random/Multiple Cylinder Misfire Detected). The only thing I can think of is this. A couple weeks ago I installed new OEM spark plugs and when I pulled the #3 plug wire out of the head it came apart (I think it was #3. it was the one in the middle that has the plastic bracket on it). I put it back together and everything seemed to work fine. I have removed the error code now and it has not happened since. I also have not been in 5th gear as well. Has this happened to anyone else?
This was my situation exactly. It became so bad that I could not drive long distances with severe misfire. I purchased a "CReader" OBDII scanner on Ebay, and so long as I left it plugged into the OBDII port, the misfire did not return. This was the situation for several months. Since I've upgraded to V3 on my Xede piggyback ECU, I can unplug the OBDII scanner, and the misfire has not (yet) returned.
Originally Posted by Ted B
This was my situation exactly. It became so bad that I could not drive long distances with severe misfire. I purchased a "CReader" OBDII scanner on Ebay, and so long as I left it plugged into the OBDII port, the misfire did not return. This was the situation for several months. Since I've upgraded to V3 on my Xede piggyback ECU, I can unplug the OBDII scanner, and the misfire has not (yet) returned.
I didn't have my ECU reflashed by Mitsu for two reasons:
(1) It does not necessarily fix the problem.
(2) AFAIK, having it reflashed by Mitsu negates the ability to have it 'Vishnu flashed', which would make my factory ECU useless in my case. Vishnu's Xede-flash reflash sets the stage for the Xede, and AFAIK, if you've had Mitsu reflash it, you're SOL where that is concerned. You should check into this.
You will have to check with Vishnu as to the version of your software, as I believe V3 may still be a Beta release.
(1) It does not necessarily fix the problem.
(2) AFAIK, having it reflashed by Mitsu negates the ability to have it 'Vishnu flashed', which would make my factory ECU useless in my case. Vishnu's Xede-flash reflash sets the stage for the Xede, and AFAIK, if you've had Mitsu reflash it, you're SOL where that is concerned. You should check into this.
You will have to check with Vishnu as to the version of your software, as I believe V3 may still be a Beta release.
I also spoke with Vishnu about the v3 upgrade. I do not currently have it. They are sending out a wire so that I can do it myself. Should I wait for the Xede fix? Does it really work? Or should I remove the Xede and bring it into the dealer for their reflash?
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Joined: Jun 2004
Posts: 49
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From: Miami Lakes
I just got a SES light this weekend and had a chance to pull the codes today. Guess what P0300... well im happy that its nothing major but then again Ive already taken my car in for the flash around January... wonder if they will get it right this time. Ill keep ya posted.
Just got my first P0300 after getting Crower cams installed. 15000 miles and previously nothing on a Vishnu stage 1.
I don't misfire at all, and it only seems to trigger the light at idle. Since the only thing that changed was the cams, I'm assuming they made the sensor go off. I'm back in Korea now, but when I get back I'll see if the Xede V3 firmware might help.
I don't misfire at all, and it only seems to trigger the light at idle. Since the only thing that changed was the cams, I'm assuming they made the sensor go off. I'm back in Korea now, but when I get back I'll see if the Xede V3 firmware might help.
My P0300 came back yesterday - twice. The symptoms described above in 5th gear are similar to what I can experience when the P0300 comes up but, perhaps, those above sound more severe.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
Originally Posted by KazzEvo8
My P0300 came back yesterday - twice. The symptoms described above in 5th gear are similar to what I can experience when the P0300 comes up but, perhaps, those above sound more severe.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
It does go completely lean when you get the light then get the hesitation. It does not pull timing though from all of my logging. I've been messing with it a lot lately considering it's time to renew my inspection.
bryan
Originally Posted by KazzEvo8
My P0300 came back yesterday - twice. The symptoms described above in 5th gear are similar to what I can experience when the P0300 comes up but, perhaps, those above sound more severe.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
I can only think 2 things: 1) P0300 causing extreme lean and creating/simulating misfire. I could lay off the gas and then hit it hard and it would work OK, but as soon as I let off and tried to accelerate lightly or moderately it would recur. 2) Plug issues - mine were wires. I replaced my plugs and when I pulled the coil pack off, the plug wire stayed on. I had to yank it out separate but the conductive wires inside the outer plug wire weren't close enough to the coil pack and/or plug any longer so I fished in with needlenose and tugged the coiled up wire inside the plug wire to get it closer to the outer ends of the outer plug wire (hope this makes sense). I HATE the plug wire/coil pack setup.
Anyway, once I "adjusted" the plug wire all's been well - until the P0300 cropped up again yesterday, twice.
I just shut down, pop the hood, and remove the two fuses for a minute. Sucks to have to shut down, let alone pop the hood. I may get a cheap reader/reset tool someday but this works for me for now.
It does go completely lean when you get the light then get the hesitation. It does not pull timing though from all of my logging. I've been messing with it a lot lately considering it's time to renew my inspection.
bryan