The 1995 305 will sputter on slight acceleration and backfire loudly through exhaust. engine starts fine and runs well for a 1/2 hr or more, then the hess. & backfire will occur. Checked the plugs most were at .0070 or so,set them at .0035 added Seafoam to the crankcase and fuel tank then drove 70 miles at about 35 miles it started hesitating this happened about 3 times during the other 35 mile drive
If timing is on mark then it could be the valves need adjusted. Also make sure the fuel line is not getting to hot and causing vapor lock which is when fuel gets to hot and starts to vaporize before entering the carb or throttle body.
Backfire is the result of unburned fuel in the exhaust igniting. I would look at the timing. Could be out enough for this to be the cause. Good starting point in my opinion. Not usually a plug issue.
SOURCE: 2007 cobalt engine hesitating during acceleration
any ck engin lights could be bad gas or spark plug or coil pack braking down
SOURCE: engine hesitating during acceleration
Ok, there are many issues here that you will need to inspect. I recommend changing the fuel filter and pump as well. this will fix the hesitation. the intake and exhaust manifold gaskets will need to be replaced as well. this will stop the backfiring.
I also recommend checking and running a teat on the PCV valve and inspect the PCV hose as well. it could have a leak or a small crack on it.
Check the air filter and change if needed. this will help with acceleration issues as well. Next, i would run a check on all plugs and the complete wire set as well. change if needed.
Inspect the injectors for leaks and lose wires. make sure they are in good condition. replace any injectors that isn't firing properly.
Ok, there are some sensors that you will need to check as well. i will list them below.
SENSOR CHECK LIST--
1. Check the O2 sensors for worn wires.
2. Check the MAFS(Mas Air Flow Sensors) Check for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3. Check the Air Cleaner Temperature Sensor. this sensor could be damaged ro have loose wires. check accordingly.
4. Check the Throttle Position Sensor. this device could be connected wrong or it may be faulty as well. replace if needed.
Be sure and inspect all the above and repair any problem spot you ruin across during your inspection.
Please rate and god bless:)
SOURCE: This car has just started hesitating. The problem
The DAMN THING has 200,000 MILES on it, give it a break, it is just waring out, drive it easy. (most likely burned valve)
SOURCE: lost power to engine
Check make sure all plugs are firing. Sounds like what my 93 Rodeo was doing-Idled okay but very rough when in gear. Turns out only 5 out of 6 plugs were firing due to a defective ignition module- 100 bucks later it works fine.
Hope this helps.
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