cylinder #5 not hitting,please help

cylinder #5 is not hitting,put new plugs and wires on it,runs the same,tested for spark on that cylinder to make sure coil is good had good spark,so i have spark now fuel,put lucas fuel inj cleaner in the tank and drove 200 miles still the same,think i should replace the injector on that cylinder?wish i could get a compression tester in there. any help or on other places to look would be great.thanks

I'd suggest buying an engine stethoscope, and listen to the injectors. If the #5 injector is not firing or firing weakly, you can hear a difference. The stethoscope is not that expensive, but I've also heard that if you're careful and have good ears, you can use a piece of vinyl tube.

If you hear the injector is not firing, I'd suggest moving it to another cylinder before you get a replacement. If the miss follows the injector, you have your answer. Otherwise, you may have a bad electrical connection.

Hope this helps! Glen

what makes you think it is not firing? Have you checked for codes? Is the check engine light on? or is it running like crap?

yes,checked for codes.

oh,my check engine light is on also.

if you consider running on 5 cylinders crap,then yes it runs like crap.

If you are getting a check engine light, you should have set a code in the computer. If you do, it is likely something like P0305 for a cylinder #5 misfire. You might check the codes again with a scanner at Autozone (free).

Again, I'd suggest you listen to the injectors and/or move the injector to see if either the injector is bad or the injector is not getting a signal to fire.

Or, they used to sell a "noid" light that plugged into the harness to see if the injector is being told to fire. You might see if a place like Autozone would have one to loan.....good luck, Glen

put a new injector in today,got a new one for 45 bucks ,to my surprise check engine light still flashing,runs better but not 100% still has a little mis,what the hell is going on how can it run better but not perfect,should be one or the other i would think,had it scanned again after i put injector in,still same thing cylinder #5 not firing,you think it might be the mas airflow sensor?or the compurter?

if you have an inline spark tester, put it in somewhere after the coil, and watch it while it is idliing. If there is no spark when it misses, it could very well be the coil tower for #5 cylinder. I forget where #5 is, hopefully it is in the front row.

if you have an inline spark tester, put it in somewhere after the coil, and watch it while it is idliing. If there is no spark when it misses, it could very well be the coil tower for #5 cylinder. I forget where #5 is, hopefully it is in the front row.

I second 89ltd.

I would verify ignition and if that doesn't reveal a problem then look for injector signal. You can buy very inexpensive testers (Under $10 CDN). Ensure that the known good injector is getting the correct signal from the PCM to duty cycle the injector.

if you have an inline spark tester, put it in somewhere after the coil, and watch it while it is idliing. If there is no spark when it misses, it could very well be the coil tower for #5 cylinder. I forget where #5 is, hopefully it is in the front row.


i already did that but thanks,after i drove it for 2 days with new injector check engine light quit flashing and finally went out,runs great now,when i put the injector in i had the battery diconnected,compurter should have been cleared of codes,dont know why it took 2 days to run right.