Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for May 2013

Cylinder 4 Misfire Detected


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2005 Scion tC (Car) 2.4L Poor Idle Quality, Misfire VIN: JTKDE17795
P0304: . Hey guys, I feel like this one's staring me in the face and I just can't get it. It has a random miss at idle that affects all cylinders and the kicker is it goes away and PURRS when I add 20% injector volume on my scanner. Lean miss, right? No specific cylind...
May 06, 2013
2005 Scion tC (Car) 2.4L Poor Idle Quality, Misfire VIN: JTKDE17795
P0304: . Hey guys, I feel like this one's staring me in the face and I just can't get it. It has a random miss at idle that affects all cylinders and the kicker is it goes away and PURRS when I add 20% injector volume on my scanner. Lean miss, right? No specific cylind...
May 07, 2013
2006 Ford E-150 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRE14WX6
P0304: Cyl. 4 misfire. ... for Rough idle, MIL flashing. Only happened when vehicle was sitting at long lights. Would run better above 30mph. Originally found P0307 and P0304 misfire along with P0300 and P0316. Vehicl...
May 08, 2013
2005 Ford Expedition XLS 5.4L Misfire, MIL Lamp on VIN: 1FMPU13595
P0304: misfire4. Hey guys this car came to me after another shop replace all the parts that I have listed in order to fix an intermitten engine misfire.the truck will run fine on start up only untill you let it warm up itll start misfiring on cyl.#3&4 that show up in the c...
May 10, 2013
2008 Volkswagen Eos lux 2.0L Hesitation, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: WVWFA71F18
P0304: cyl 4 misfire. EPC light on, when cold problem seems worse. According to Mitchell I checked voltage at the low pressure fuel pressure sender. Mitchell says I should have ground on 1 term, 5 volt on another, and bat voltage on 3rd term. I have ground on 1 and 5 volts on both ...
May 13, 2013
2006 Audi A3 2.0L Misfire, MIL Lamp on VIN: WAUMF78P26
P0304: . Hello Audi/VW Techs. This A3 has a pattern of running rough and misfiring for about 30 seconds when cold, then it runs perfect all day. High and low fuel pressure are within specs. Coils have been updated. The interesting thing is that when it runs rough my re...
May 14, 2013
2007 Volkswagen Beetle 2.5 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3VWRG31Y27
P0304: Cyl 4 misfire. Hello Everyone, I have a vehicle that idles rough and misfires when cold. After it warms up for about 45 seconds it run fine. We replace spark plugs and mass air flow sensor and that didn't help. I was wondering if someone can lead us in the right direction. W...
May 14, 2013
2008 Mini Cooper S 1.6L Poor Idle Quality, MIL Lamp on VIN: WMWMF73538
P0304: . This car came in for check engine light and poor idle. Car idles poorly but runs great going down the road. I have smoked it several times and not found any vacuum leaks. Spark plugs look good and are correct. The fuel pressure readings on data stream seem goo...
May 15, 2013
2006 Audi A3 2.0L Misfire, MIL Lamp on VIN: WAUMF78P26
P0304: . Hello Audi/VW Techs. This A3 has a pattern of running rough and misfiring for about 30 seconds when cold, then it runs perfect all day. High and low fuel pressure are within specs. Coils have been updated. The interesting thing is that when it runs rough my re...
May 16, 2013
2001 Dodge Dakota R/T 5.9L Poor Idle Quality VIN: 1B7GL22Z71
P0304: Cylinder 4 Misfire Detected. #4 is misfiring intermittantly at idle and when it does hc jumps from 200ppm to 3700ppm o2 jumps from 1 percent to 5 percent and lambda jumps from 1 percent to 1.15 percent, sorry this does not compute, at least for me,just looking for the possible causes, com...
May 20, 2013
1997 Mitsubishi Eclipse Spyder GS 2.4L Poor Idle Quality, Surge, Misfire VIN: 4A3AX35G6V
P0304: Cylinder 4 Misfire Detected. car came in idling terrible very unstable,ck engine light on customer says its lacking power cylinder balance test,all firing scope injectors,patterns look good checked spark at each plug wire with spark tester,OK this car to me is suffering from a lean condit...
May 30, 2013
2001 Volvo S40 1.9L Misfire VIN: YV1VS29531
P0304: Cyl 4 misfire. Cylinders 1&2 are dead. Removing the injector connector has NO effect. The scan tool however shows misfires on cylinders 1&4. the previous mechanic installed the timing belt, But the marks look good. Found a vacumn leak at the intake, replaced intake m...
May 31, 2013
2005 Scion tC (Car) 2.4L Poor Idle Quality, Misfire VIN: JTKDE17795
P0304: . Hey guys, I feel like this one's staring me in the face and I just can't get it. It has a random miss at idle that affects all cylinders and the kicker is it goes away and PURRS when I add 20% injector volume on my scanner. Lean miss, right? No specific cylind...
May 06, 2013
2005 Scion tC (Car) 2.4L Poor Idle Quality, Misfire VIN: JTKDE17795
P0304: . Hey guys, I feel like this one's staring me in the face and I just can't get it. It has a random miss at idle that affects all cylinders and the kicker is it goes away and PURRS when I add 20% injector volume on my scanner. Lean miss, right? No specific cylind...
May 07, 2013
2006 Ford E-150 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRE14WX6
P0304: Cyl. 4 misfire. ... sitting at long lights. Would run better above 30mph. Originally found P0307 and P0304 misfire along with P0300 and P0316. Vehicl...
May 08, 2013
2005 Ford Expedition XLS 5.4L Misfire, MIL Lamp on VIN: 1FMPU13595
P0304: misfire4. Hey guys this car came to me after another shop replace all the parts that I have listed in order to fix an intermitten engine misfire.the truck will run fine on start up only untill you let it warm up itll start misfiring on cyl.#3&4 that show up in the c...
May 10, 2013
2008 Volkswagen Eos lux 2.0L Hesitation, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: WVWFA71F18
P0304: cyl 4 misfire. EPC light on, when cold problem seems worse. According to Mitchell I checked voltage at the low pressure fuel pressure sender. Mitchell says I should have ground on 1 term, 5 volt on another, and bat voltage on 3rd term. I have ground on 1 and 5 volts on both ...
May 13, 2013
2006 Audi A3 2.0L Misfire, MIL Lamp on VIN: WAUMF78P26
P0304: . Hello Audi/VW Techs. This A3 has a pattern of running rough and misfiring for about 30 seconds when cold, then it runs perfect all day. High and low fuel pressure are within specs. Coils have been updated. The interesting thing is that when it runs rough my re...
May 14, 2013
2007 Volkswagen Beetle 2.5 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3VWRG31Y27
P0304: Cyl 4 misfire. Hello Everyone, I have a vehicle that idles rough and misfires when cold. After it warms up for about 45 seconds it run fine. We replace spark plugs and mass air flow sensor and that didn't help. I was wondering if someone can lead us in the right direction. W...
May 14, 2013
2008 Mini Cooper S 1.6L Poor Idle Quality, MIL Lamp on VIN: WMWMF73538
P0304: . This car came in for check engine light and poor idle. Car idles poorly but runs great going down the road. I have smoked it several times and not found any vacuum leaks. Spark plugs look good and are correct. The fuel pressure readings on data stream seem goo...
May 15, 2013
2006 Audi A3 2.0L Misfire, MIL Lamp on VIN: WAUMF78P26
P0304: . Hello Audi/VW Techs. This A3 has a pattern of running rough and misfiring for about 30 seconds when cold, then it runs perfect all day. High and low fuel pressure are within specs. Coils have been updated. The interesting thing is that when it runs rough my re...
May 16, 2013
2001 Dodge Dakota R/T 5.9L Poor Idle Quality VIN: 1B7GL22Z71
P0304: Cylinder 4 Misfire Detected. #4 is misfiring intermittantly at idle and when it does hc jumps from 200ppm to 3700ppm o2 jumps from 1 percent to 5 percent and lambda jumps from 1 percent to 1.15 percent, sorry this does not compute, at least for me,just looking for the possible causes, com...
May 20, 2013
1997 Mitsubishi Eclipse Spyder GS 2.4L Poor Idle Quality, Surge, Misfire VIN: 4A3AX35G6V
P0304: Cylinder 4 Misfire Detected. car came in idling terrible very unstable,ck engine light on customer says its lacking power cylinder balance test,all firing scope injectors,patterns look good checked spark at each plug wire with spark tester,OK this car to me is suffering from a lean condit...
May 30, 2013
2001 Volvo S40 1.9L Misfire VIN: YV1VS29531
P0304: Cyl 4 misfire. Cylinders 1&2 are dead. Removing the injector connector has NO effect. The scan tool however shows misfires on cylinders 1&4. the previous mechanic installed the timing belt, But the marks look good. Found a vacumn leak at the intake, replaced intake m...
May 31, 2013