Random Misfire with 3.1
#1
Random Misfire with 3.1
I have this annoying misfire that comes and goes away and i cannot figure out, i tested the module underneath the coil packs, i have swapped the coil packs out with my spare ones, still does it, fixed the one wire that had an arcing problem at the boot, still does it, i changed the plugs also, still does it as well, i changed my fuel filter out and it still does it. I am really stumped on this one. Please help guys
#2
most common things could be- vacuum leak in the intake manifold, throttle body or vacuum plumbing, a defective EGR valve that is leaking exhaust into the intake manifold, or even bad gas..
less common causes could be bad- spark plug wires, worn or fouled spark plugs, a weak ignition coil, dirty fuel injectors, low fuel pressure, or weak valve springs
less common causes could be bad- spark plug wires, worn or fouled spark plugs, a weak ignition coil, dirty fuel injectors, low fuel pressure, or weak valve springs
#3
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,156
Do you know which cylinder is mis-firing?
Some people recently had issues with the fuel regulator causing mis-fires. You may also have a failing injector. As msnyder1112 pointed out, could also be a vac leak.... With the car idling, mist starting fluid around all vacuum lines and connections, listen for the idle to change.
Some people recently had issues with the fuel regulator causing mis-fires. You may also have a failing injector. As msnyder1112 pointed out, could also be a vac leak.... With the car idling, mist starting fluid around all vacuum lines and connections, listen for the idle to change.
#5
it was either the t section under the throttle bracket on top of the upper intake/plenum, but I also replaced the throttle body gasket, but the problem is gone and she is running like a champ and punching great. Thanks for the help guys
Thread
Thread Starter
Forum
Replies
Last Post
1996Monte_Carlo
Engine/Transmission/Performance Adders
9
07-05-2012 04:49 PM
Absolutpolack
Engine/Transmission/Performance Adders
6
02-23-2012 02:07 PM
jpoogie84
Engine/Transmission/Performance Adders
31
01-08-2012 06:29 PM
pcarey
Engine/Transmission/Performance Adders
8
02-20-2011 09:12 AM
menaja19
Engine/Transmission/Performance Adders
14
01-02-2008 09:21 PM