Question about 1998 Plymouth Grand Voyager

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Misfire, thought bad gas, tried 2 dryers, fuel pump, spark plugs, wires, hoses, all fine. Smell of fuel. back fires bad mpg. need touble codes but no engine light.

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Bad coils maybe? remove and get ohm check for free at Autozone

Posted on Oct 04, 2009

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1999 fiesta 1 2 misfire on cylnder 2


It takes all 4 ingredients to fire a cylinder - Air, Fuel, Spark, and Timing. If you only have one misfire code (P0302 - Cylinder #2 Misfire), it should be a relatively easy diagnosis and fix. Let's start with Spark. I'm going to assume you have a code reader. First, remove the spark plug in #2 cylinder. Examine the threaded end. Is it wet and/or smell like fuel? If so, chances are the misfire is caused by a weak/absent spark. To confirm, swap it with a known good cylinder - example #3 cylinder. Clear the code. Start it and let it run for a couple of minutes. If a code appears with P0303 (the last digit refers to cylinder number), then you have found the culprit - bad spark plug. If the code reappeared with P0302 (Cylinder #2 again), then swap out the spark plug wire (both ends). Clear the code. Start and run for a couple of minutes. Again, if it appears on Cylinder #3 - the plug wire is the culprit. If the P0302 code comes back, swap the coil. See where this is going?

Now, when you first pulled the plug from Cylinder #2, if it wasn't wet or smelled of fuel, chances are Spark is not the issue. Was the plug dry and/or ashy? Possible cause is no fuel reaching the combustion chamber (cylinder). Using an automotive stethoscope, listen to the fuel injector for cylinder #2 while the motor is running. Should hear a regular and rhythmic ticking sound. Like a fast clock. (Use a long handled screwdriver touching one end to your ear and the other to the top of the injector if you dont have a stethoscope). No clicking or irregular clicking means fuel injector is not working (no sound) or is not working properly. Like searching for the Spark problem, swap the injector in #2 cylinder with #3. Clear code. Start and run. If the problem moved to #3, ithat injector is the culprit. If it stayed on #2, it is likely your wiring to that injector - check the whole harness for loose connections or swelled with oil wires/connectors. Keep pecking away at the fuel delivery system for that cylinder. Stay looking for things that affect only that cylinder.

When you pulled the plug, was it fairly normal looking? Then this misfire code might only be a timing problem. It is likely not a timing problem in your case, because timing affects all cylinders, but I thought I would just mention it since Timing is an important part of combustion. Also, if timing were a culprit here, another code would usually appear signifying the Camshaft Positon Sensor or Crankshaft Position Sensor was/is failed, or it is possible for the timing belt/chain to skip a knurl on a sproket and throw the timing off, but like I said, it would almost always cause multiple/random (Code P0300) misfires.

And finally, when you pulled the plug earlier, if it was an oily sticky mess, then the culprit might be Air - or compression/lack of compression. Lets hope not, because when Air is the cause of a misfire, it is usually an expensive fix. Need to perform a compression test. If you have little or no compression in the cylinder, it is likely a bad head gasket or a stuck/sticky/broken/chipped valve (exhaust or intake). Any of these things are bad news and expensive to fix in a shop. Also bad news and time consuming and difficult task for a shade tree mechanic.

Now, clear that code and get started! Good luck!

Feb 17, 2014 | Cars & Trucks

1 Answer

2000 Saturn sc2 has a misfire


It takes all 4 ingredients to fire a cylinder - Air, Fuel, Spark, and Timing. If you only have only one misfire code (example: P0302 - Cylinder #2 Misfire), it should be a relatively easy diagnosis and fix. You didnt mention which cylinder has the misfire, so let's assume it is on Cylinder #2. Start with Spark. I'm going to assume you have a code reader. First, remove the spark plug in #2 cylinder. Examine the threaded end. Is it wet and/or smell like fuel? If so, chances are the misfire is caused by a weak/absent spark. To confirm, swap it with a known good cylinder - example #3 cylinder. Clear the code. Start it and let it run for a couple of minutes. If a code appears with P0303 (the last digit refers to cylinder number), then you have found the culprit - bad spark plug. If the code reappeared with P0302 (Cylinder #2 again), then swap out the spark plug wire (both ends). Clear the code. Start and run for a couple of minutes. Again, if it appears on Cylinder #3 - the plug wire is the culprit. If the P0302 code comes back, swap the coil. See where this is going?

Now, when you first pulled the plug from Cylinder #2, if it wasn't wet or smelled of fuel, chances are Spark is not the issue. Was the plug dry and/or ashy? Possible cause is no fuel reaching the combustion chamber (cylinder). Using an automotive stethoscope, listen to the fuel injector for cylinder #2 while the motor is running. Should hear a regular and rhythmic ticking sound. Like a fast clock. (Use a long handled screwdriver touching one end to your ear and the other to the top of the injector if you dont have a stethoscope). No clicking or irregular clicking means fuel injector is not working (no sound) or is not working properly. Like searching for the Spark problem, swap the injector in #2 cylinder with #3. Clear code. Start and run. If the problem moved to #3, ithat injector is the culprit. If it stayed on #2, it is likely your wiring to that injector - check the whole harness for loose connections or swelled with oil wires/connectors. Keep pecking away at the fuel delivery system for that cylinder. Stay looking for things that affect only that cylinder.

When you pulled the plug, was it fairly normal looking? Then this misfire code might only be a timing problem. It is likely not a timing problem in your case, because timing affects all cylinders, but I thought I would just mention it since Timing is an important part of combustion. Also, if timing were a culprit here, another code would usually appear signifying the Camshaft Positon Sensor or Crankshaft Position Sensor was/is failed, or it is possible for the timing belt/chain to skip a knurl on a sproket and throw the timing off, but like I said, it would almost always cause multiple/random (Code P0300) misfires.

And finally, when you pulled the plug earlier, if it was an oily sticky mess, then the culprit might be Air - or compression/lack of compression. Lets hope not, because when Air is the cause of a misfire, it is usually an expensive fix. Need to perform a compression test. If you have little or no compression in the cylinder, it is likely a bad head gasket or a stuck/sticky/broken/chipped valve (exhaust or intake). Any of these things are bad news and expensive to fix in a shop. Also bad news and time consuming and difficult task for a shade tree mechanic.

Now, clear that code and get started! Good luck!

Feb 10, 2014 | Cars & Trucks

2 Answers

Engine will not run. This car sat thru the winter in a unheated garage. I have spark, I have fresh gas. Thinking that the fuel pump was dry, I turned the egnition key to on position with out cranking...


try some starting fluid (either).

Inspect the wiring at the fuel pump (if not in the tank).

Alternately, have the psi tested on the fuel line.

Are you certain there is enough fuel and the car is not uneven (as on a hill preventing a low fuel availability to get to the fuel pump to pump such that it can pump the fuel?)

Another stupid question - have you looked at any of your sensors -- such as the crankshaft positioning sensor?

This should give you a couple ideas anyway..
Best regards
Ck

Aug 18, 2011 | 1997 Mercury Grand Marquis

2 Answers

Getting gas smells and misfiring on a 2000 chevy venture. what might be the problem? was told not running on 2 of the 6 cylinders could that be the only problem? i am being told its something else


first off you have to fix the misfire problem before you can do anything else,as a misfire will cause a fuel smell because you have 2 cylinders acting like a raw fuel pump ,by the fuel entering the cylinder not burning a being pumped out unburned.so you have to find out why it is your six cylinder car is only running on 4 cylinders and repair the problem.then you can go from there if you have to,also you will have to change the oil as it will have fuel in the oil which thins out the oil to a point it does not do it`s job and could ignite in the oil pan causing other problems

Mar 04, 2011 | Chevrolet Venture Cars & Trucks

2 Answers

Motor turns over but will not start, seems to be getting gas, & spark


I don't have enough info to give you a specific answer so I've listed a bunch of possible problem that could cause your engine to roll over but not start.
Check the battery and connections, a weak battery or bad connections can cause a weak spark and stop the engine from firing.
Fuel pump or fuel filter, low gas pressure can cause to lean of a air/fuel mixture for the engine to start.
Bad gas, old gas or water in the gas can stop the engine from firing.
Bad or fouled spark plugs, could be caused by bad gas.
Ignition wiring problems, can cause weak or unreliable spark.
Bad, poorly connected or misconnected spark plug wires. Even 2 wire out of order can stop the engine from firing.
Oily spark plug wires, can cause the spark to fire at the wrong cylinder or misfire.
Worn, damaged or wet ignition components.

Jun 08, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Took my car to have check engine light checked. It said misfire cylinder 2. I replaced the spark plug wires and spark plugs and it still says misfire cylinder 2. What is the next step? Thanks Steve


In modern cars so much can go wrong to indicate an issue and a computer in the car can get confused as to what is really occurring. In most cars a misfire indicates either an incorrect firing order, shorted wires, bad plugs, or bad coil. Since you have replaced the wires and plugs we can rule those out. Im also assuming after the second engine code you pulled #2 plug and made sure it wasnt fouled with oil, was gapped correctly, and reinserted. To produce a sufficient spark for combustion the alternator sends power to a "Coil" which is in reality a storage point that then sends an amplified electrical current down the spark plug wire to the cylinder to fire the plug. If the car is truly misfiring you will notice a rough idle, fluctuating RPM's, and lack of acceleration. If you are experiencing any of these I would look at replacing the coil. If you arent experiencing any of these I would have the code cleared again and complete one drive cycle 100 miles and then have codes read again. If you still get a Misfire error some other causes known to occur with Rio's are fuel filter issues, gas caps, and fuel injector issues. Although rare, these can cause issues with the cars fuel delivery and emissions which can confuse the sensor in the ECU. I would try injector cleaner, replace the fuel filter, and gas cap . If funds are an issue then based on symptoms I would start with injector cleaner first $3, Filter $12, Gas cap $12, Coil $48 to $200+

Jun 06, 2010 | 2001 Kia Rio

1 Answer

My impala miss fires when i step on the gas whats wrong


please read about causes of this misfire in the engine.
The most common misfire causes on the cars I've worked on have been:
  1. Spark plugs
  2. Spark plug wires (most common)
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

May 23, 2010 | 2000 Chevrolet Impala

1 Answer

It is running ruff, wants to cut off. Using more


Fuel pump in gas tank, more then likely not fuel pump, do fuel pressure test should have 13 -15 psi fuel pressure, Pull codes and data get reading out of M.A.P sensor this one at like a choke, also from C.T.S sensor also acts like a choke, check for a misfire 1st pull one spark plug wire at a time.the one that not fireing chould be a defective wire or bad cylinder compression ( do cylinder compression test ). Good luck,hope this was very helpful.

Dec 27, 2009 | 1989 Pontiac Firebird

3 Answers

Engine misfire...


check spark plugs an lead and check the fuel filter if still the same send me an email an i will get back to u it is jasonscompletecarcare@hotmail.com

Jul 09, 2009 | 1998 Land Rover Discovery

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