help with miss?

[tstan7777]

I have an '01 Bullitt that's missing. No codes, no check engine light, and I changed the fuel filter. What should I check next? Isn't the fact that no codes have been thrown help eliminate a few things?

 

[DerekStangGT]

how do you know its missing? to make sure, get a piece of papaer and put it flat over the tailpipe while running. a misfiring car will make the paper vibrate and tap tap tap. im confused b/c a misfire will throw a code 95% of time i thought

 

[tstan7777]

I thought there'd be a code too. It's definitely missing. Lower rpm's, under load. I had a local Auto Zone scan it, is that reliable? For sure no check engine light though.

 

[tstan7777]

Anyone have a suggestion?

 

[HoustonGT]

BUMP, Having the same problem

 

[03ghoststang]

check the plugs and coil packs, the COP should read have some resistance (ohm)

 

[46gtsblown]

Clean MAF, Clean/replace air filter,Check/replace plugs, injector cleaner, seafoam or similar.
95% of the time just basic tune up items will take care of your problem.
Dwayne

 

[jasonh_86]

I'm having a miss on Cyl 4. I've had the light on for a few days now and it's come up as that. The light doesn't always stay on for good, the other day it turned off and stayed off til the next evening. Now it's just staying on, but I don't feel any misfire.

What will fix this?

 

[Dorsai]

Anyone have a suggestion?

Need more info....how many miles, mod's?. Misses when it's cold, hot or all the time?

Missing is usually ignition parts giving up the ghost...loose plug, cracked plug insulator, bad COP, battery going to battery heaven....

If it's stumbling (different feel than missing) it could be a vacum leak or bad air seal on the intake assembly somewhere, especialy if you have a CAI thats not tightly clamped allowing air in behind the air sensor...