Missing under load, and at high RPM?

JakeDaSnake · Sep 13, 2006

My '96 GT started missing when I put it under a load about 2 weeks ago... My first though was, its time for some plugs, but I put new NGK's in it yesterday and It didn't stop. I ran some Sea-Foam through the intake and that didn't help either, my fuel filter is on order from advanced (why they didn't have it I dont know, lol).

My question is could a plug wire cause a miss like this? I would think it would be constant? that or either a coil is going bad...

What do yall think? could a fuel filter or dirty K&N also cause it? Im letting my K&N dry as I type this and the filter should be here soon...

Let me know...
Jake

kruegs74 · Sep 13, 2006

Sounds like a ignition problem to me. Try spraying the plug wires with water in a low lit area you might be able to see a wire shorting or the motor might even start to bog down. good luck

Mike97gt · Sep 14, 2006

could be plug wires or one of the coils. If you have the original wires I would get some new ones and go from there. At work I could test them to tell you if it's the coil or wire but there is really not much you can do without the proper equipment to isolate the cylinder or to tell if it's the wires or coil pack.

jivepepper · Sep 14, 2006

Mine did the same thing when I had a bad fuel pump. Try the fuel filter first.

Mike97gt · Sep 14, 2006

you can tell a bad fuel pump easy. just hook up a fuel presure guage and see if the presure falls when the problem happens.

99 times out of 100 it's ignition related.. this is a very common problem in the modualr motors.

jivepepper · Sep 14, 2006

I have never had an ignition problem with 140k and 2 different sets cop's off of 2 different motors.

JakeDaSnake · Sep 14, 2006

Thanks for the reply's guys... There not the original wires, I replaced them about 25,000 miles ago when the car belonged to a buddy of mine, the killed the original wires trying to get them off the plugs...

I'll try the filter and wires...

Thanks,
Jake

Mike97gt · Sep 14, 2006

jivepepper said:
I have never had an ignition problem with 140k and 2 different sets cop's off of 2 different motors.

ohh well I guess that makes me a liar then Do you realize I see a lot more modulars than you do? The stuff I post on here is based on 10 years of working on these cars for a living, not just one car. Go read some of the threads in this forum you will see that many many people have had ignition problems.

I would say for every misfire thats caused by a fuel system concern there is one hundred that was caused by ignition concerns. It's that much more common.

sure his problem might be fuel system related, and without proper tests there is no way to be sure, so I am just telling him the most common cause for his problem. In the entire time I have been working as a ford tech I have replaced maybe 10 or so fuel pumps for a failure like this.. I probally have done several hundred with the ignition system causing a concern like this.

Red2000GT · Sep 14, 2006

I had a bad o2 sensor that caused the exact same problem. I was able to verify it using my Predator in real time mode and seeing what the 02's were exactly doing.

jivepepper · Sep 14, 2006

svttech76 said:
ohh well I guess that makes me a liar then Do you realize I see a lot more modulars than you do? The stuff I post on here is based on 10 years of working on these cars for a living, not just one car. Go read some of the threads in this forum you will see that many many people have had ignition problems.

I would say for every misfire thats caused by a fuel system concern there is one hundred that was caused by ignition concerns. It's that much more common.

sure his problem might be fuel system related, and without proper tests there is no way to be sure, so I am just telling him the most common cause for his problem. In the entire time I have been working as a ford tech I have replaced maybe 10 or so fuel pumps for a failure like this.. I probally have done several hundred with the ignition system causing a concern like this.

No one called you a liar you crazy chit. Now relax and go take a bromo you homo and wake up feeling yourself.

Mike97gt · Sep 14, 2006

jivepepper said:
No one called you a liar you crazy chit. Now relax and go take a bromo you homo and wake up feeling yourself.

I don't wake up feeling myself.. I just do that in front of a mirror while thinking how great I am

LOL it looks like we ruined this guys thread

jivepepper · Sep 14, 2006

sorry lol

Missing under load, and at high RPM?

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