ENGINE MISSES DURING ACCELRATION

[nozerider]

I just noticed this about my '91 ex, and was wondering if anyone knew what could be the problem. You see, during acceleration from a full stop the engine misses a couple times. It only happens at a full stop.
Any ideas???

 

[adidaswear]

replace plugs and wires

 

[natedogco2007]

use some fuel cleaner and try running some high end fuel through it. when it's cold out the engine needs more octane.

 

[MattPersman]

you gotta find out whats its missing from, fuel or spark first then replace parts accordingly. you need an ignition tester to test the plugs/wires and an injector pulser/noid lights to test the injectors. injectors could be real dirty, intake could be carboned up real bad, plugs and/or wires could be worn out

 

[Rhett]

Sounds like plugs and wires...

 

[Limited Ex]

My Explorer just got out of the shop for a miss in the engine. I had replaced the plugs and wires but that did not do any good. It ended up being that I had a stuck valve, so the heads came off and they replaced the seals. And now it runs like brand new! But it was a little bit more $$$ than originally suspected...

 

[LukeDog3D]

http://www.explorerforum.com/forums/showthread.php?threadid=90340&highlight=hesitation


see thread...


I had the same problem. It turned out to be my coil pack....i had bought a new one, and the new one turned out to be bad....so I bought ANOTHER ONE after like a year of f&*@ing replacing parts.

check the secondary resistance on the coil with a multimeter. 6-11.5k ohms is within spec.

if thats not the problem, pull the plugs and check them out (gap, electrode color/condition and ceramic insulator condition), replace as needed.... and do a compression test. Those two things alone will give you a wealth of information about your general engine health. If all else fails, get a manual and do all of the multimeter tests that you can before buying new parts.

of course a general tune up is always recommended...fuel filter/clean maf/new plugs/new wires/new air filter......make sure everything is plugged in under the hood....

 

[Billy177]

colder weather does not require higher octane although it does advance the timing. try cleaning your mas airflow sensor and change the plugs and wires

 

[TaTToo]

I have the same problem and have had it for a while now. I replaced the plugs and wires, and it helped for a week. After pulling out the new spark plugs, low and behold - oil was on my #2 plug - very bad thing. I had the compression checked and #1 and #2 cylinders were pushing only 50 pounds of pressure. This is where it gets a bit tricky, especially for a novice mechanic such as I. It could be a host of anything from valve and piston problems to a cracked head, and can cost anywhere (here anyway) from $400.00 to $1200.00. Could require a total rebuild/replacement, just some grinding or anything in-between.
Unless you are advanced in engine repair, I would recommend taking it to a Certified mechanic to have it pressure tested and repaired. Just a thought.