jamielfowler

i changed the plugs, cap, and the button and it starts skipping as soon as it warms up!!!The wires have about 8000 miles on it. i built it 30 over b303cam 70mm throttle body, mac headers ported cobra intake underdrive pulleys, svo phlenum h-pipe and flows and a ugly skip! Ha! I need advice.

5.0stanger

What kind of plugs did you put in? What are they gapped at? Must be something you did if it didn't do it before.

jamielfowler

it was doing it before adding new products

WhiteWindsor

Do a compression check to be sure. Last week my 93 f-250 had a dead skip. No codes and check engine light was not on. I did not have comp. in cyl 6 and 8. Pulled the head and the valves had hung open damaging one of my pistons. I went ahead and ordered a reman. long block with a 3 year warr. Hopefully this is not your problem. I figured mine was something simple and tested everything to find it was two of my cyl. If you have had the problem for awhile a comp. check would be a good idea anyway.

http://s194.photobucket.com/albums/z112/keithswearingen/?action=view¤t=c3a71cc9.pbw

LTnone

Edit: nevermind, missed where you said it missed before adding new parts.

Sounds like something related to air metering, as it starts skipping (and goes into closed loop) after warming up

mjr46

remember guys pre odb II vehicles don't have the ability to monitor/ check for misfires!!! code scanning for misses probably will yield you no results I know this is not what you want to hear but it'll eliminate a lot of hassel and solve problem quick what you need is a portable osciliscope one like the modis (snap on) meaning take the car to a shop!!! then you can watch the secondary ignition patterns and also the primary depending on how you hook it up. gauranteed you will see what cylinder the miss is on and if it's missing on random cylinders then you can assume the problem is on a component that affects the system as a whole like a coil (faulty cap or rotor) I don't care if it's new I bought 3 from napa in a row one time using the econo line on my 66 that has a very mild 302that were bad until i finally bought the premium line cheap diesn't always work. anyway on random cylinder misses look for things that affect the system as a whole like fuel pressure, mass air ect ect...... anyway good luck best way to isolate a miss is with an osciliscope!!!!

AdderMk2

probably bought a cracked plug. let the car run, then pull all the plugs.

look to see which one is black... thats your problematic cylinder.

LTnone

You can also sit there with the car running (I'd do it quickly, so it doesn't get too hot) and yank plugs one by one (replacing after yanking em). You should run rough(er) when you pull the wires, if you pull one and there's no change in how the motor runs that's the one that's not doing it's share

AdderMk2

pulling spark plug wires.... now there is a smart move

P Zero

Once that 50,000 volts runs through one arm and out the other youll shy away from doing that....
-P.