My number 1 cylinder is missfiring. Already chnged the coil pack. Car is already at 100000 miles. Spark plugs were changed with the bosch 4+ about 40000 miles ago. Fuel filter was replaced 30000 ago. Emptied a bottle of fuel injector cleaner into a full tank of fuel and the engine light continues to light up. Can somebody shed some light on this situation; do I need to replace the fuel injectors or is there a vaccum leak of some sort.
Number 1 cylinder missfire. What to do?
- Thread starter k_y86
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RawAmericanMuscle
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Can you enlighten us on what has been done to the car as far as mods?
Spacey_stacey75
Full Access Member
REplace fuel injector for that cylinder, make sure to change the o-ring and replace you MAP sensor.
Should fix it, just had same problem with #3 cylinder.
Should fix it, just had same problem with #3 cylinder.
bryson87
Full Access Member
Check the gap on the plugs
cobalt123
Platinum Member
definately check the gap on the spark plugs first cheapest way
Revenant_SS
Full Access Member
Swap #1 and #4 plugs. Chances are you'll get the misfire on #4 now because Bosch plugs are pure garbage. Replace with a set of AC Delco or NGK.
Put it to you this way. If I have a customer coming in looking for a tuneup, I would send them to another shop before we'd put Bosch plugs in.
Put it to you this way. If I have a customer coming in looking for a tuneup, I would send them to another shop before we'd put Bosch plugs in.
bryson87
Full Access Member
and if swaping the plugs dont work. swap the coil packs around also if it moves to the next cyl you put it on its the pack
no mods
No mods have been done to this car just stock.
---------- Post added at 09:20 AM ---------- Previous post was at 09:18 AM ----------
Can not gap the spark plug because it has the 4 of the things that you need to gap, not just one.
---------- Post added at 09:22 AM ---------- Previous post was at 09:20 AM ----------
Already swaped spark plugs but with the #3 cylinder and it's still running the same.
---------- Post added at 09:25 AM ---------- Previous post was at 09:22 AM ----------
Dude I think your right because so far I've swaped the spark plugs and nothing so far. So where would the MAP sensor be located on a 2007 LS cobalt.
No mods have been done to this car just stock.
---------- Post added at 09:20 AM ---------- Previous post was at 09:18 AM ----------
Can not gap the spark plug because it has the 4 of the things that you need to gap, not just one.
---------- Post added at 09:22 AM ---------- Previous post was at 09:20 AM ----------
Already swaped spark plugs but with the #3 cylinder and it's still running the same.
---------- Post added at 09:25 AM ---------- Previous post was at 09:22 AM ----------
Dude I think your right because so far I've swaped the spark plugs and nothing so far. So where would the MAP sensor be located on a 2007 LS cobalt.
Spacey_stacey75
Full Access Member
well mine on an 06 was right under the intake, I think above the intake manifold
I went and bought the haynes repair manual so I could do this shit myself. I hate paying someone for something I can do.
I went and bought the haynes repair manual so I could do this shit myself. I hate paying someone for something I can do.