need help with misssing problem.

[BK_CAULEY]

i have already done a search and tried everything i can do to make it go away. when i get in the higher rpms (above 3500) i am experiencing a very light cut out. it just is noticable but it is there. its not a real hard cut out or miss is soft but i cant narrow it down. i checked plugs and they look good. wires rotor and cap are all new. i replaced my fuel filter and even added a fuel treatment to make sure i had no water n the tank. im at a loss and dont know what to check for next.

 

[4G-KDMP]

jrichker should be here shortly to help you.
there isn't much he doesn't know when it comes to problems like this.

 

[KcMstang]

Pull the codes! Are your plugs gapped right?

 

[BK_CAULEY]

there is no codes and there gapped at .035 thats what they have always been.

 

[BigHairyMonkey]

there is no codes and there gapped at .035 thats what they have always been.

i was under the impression plug gap should be set at .054

 

[BigHairyMonkey]

there is no codes and there gapped at .035 thats what they have always been.

and also have you tried pulling the codes or are you under the impression there are no codes because of no CEL light?

 

[ninety15.0]

Plug gap should be set at .054"

 

[BK_CAULEY]

and also have you tried pulling the codes or are you under the impression there are no codes because of no CEL light?

no i have pulled the codes many times, and tried the other day. and i have always had my plugs at 35-40ish and have never had anyproblems. this just all of a sudden started.

 

[Fett]

Is it under accel or just cruising?

One easy thing to check is unplugging the vac line to the EGR. Just pop the vac line off the EGR and stick it on the bolt that holds the AC accumulator onto the firewall. It will block off that line so you don't get a vac leak. With the vac line off the EGR go take it for a spin and see if the problem went away.

It might not be your problem, but I was experiencing the same thing you described, and went through the usual routine, plugs, wires, cap, ect. I unhooked the vac line to the EGR (disabling it) and the problem went away. The EGR gradually opens and closes, mainly at cruising speeds. They can develop basically a dead spot, and will open too far, then close all the way rapidly, causing the exact problem you are describing.

Like I said, this might not be your problem...but it will literally take 5 minutes to check so you can at least rule that out as a possible problem.

 

[jrichker]

Does the problem occur mostly on a warm or hot engine? Or does it happen all the time? No codes?

 

[hogt2]

i had a similar problem under hard acceleration above 3500 rpm. Did all the usual changing of parts with no change in miss. Then I bought a cheap coil to replace the one I had. That fixed the problem. My coil was junk. I then bought a MSD coil to replace the cheap one I used for diagnosis. This could be your problem. Good luck.

 

[angeljenylynn]

make sure your timing is ok, mine was off just slightly and it missed JUST a bit, like you're saying.

 

[BK_CAULEY]

Is it under accel or just cruising?

One easy thing to check is unplugging the vac line to the EGR. Just pop the vac line off the EGR and stick it on the bolt that holds the AC accumulator onto the firewall. It will block off that line so you don't get a vac leak. With the vac line off the EGR go take it for a spin and see if the problem went away.

It might not be your problem, but I was experiencing the same thing you described, and went through the usual routine, plugs, wires, cap, ect. I unhooked the vac line to the EGR (disabling it) and the problem went away. The EGR gradually opens and closes, mainly at cruising speeds. They can develop basically a dead spot, and will open too far, then close all the way rapidly, causing the exact problem you are describing.

Like I said, this might not be your problem...but it will literally take 5 minutes to check so you can at least rule that out as a possible problem.

I havent thought about that. i will try it today.

Does the problem occur mostly on a warm or hot engine? Or does it happen all the time? No codes?

It happens all the time. and i had no codes. just 11.

i had a similar problem under hard acceleration above 3500 rpm. Did all the usual changing of parts with no change in miss. Then I bought a cheap coil to replace the one I had. That fixed the problem. My coil was junk. I then bought a MSD coil to replace the cheap one I used for diagnosis. This could be your problem. Good luck.

It might be the coil i will also try that today.

make sure your timing is ok, mine was off just slightly and it missed JUST a bit, like you're saying.

Once again i havent thought about my timing, will check that also.


thanks for the input guys.

 

[noslow1986]

same problem bad coil

 

[angeljenylynn]

hope you get it fixed. let us know what it was!