Joined
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413 Posts
EDIT/Cliff's Notes: This thread was originally called BAD Misfire, and the whole thread of diagnosis is intact, but if you go to posts 30, 31, and 39, you'll learn how to easily make your own smoke machine for finding vacuum leaks.
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Short story--
New distributor and all things related to it
New coil (old one used to rule out new one)
New Ford 9mm wires (only about 300 miles on them but you never know)
New Autolite 25s
All vacuum lines are new/checked
*13 timing advance
New IAC
New O2s
New map sensor
New intake gaskets
New TPS sensor and set correctly
Base idle reset
Codes pulled and repairs made.
Car is still SD (88 GT) The car misses randomly and badly during cruise and especially around 1,200 to 3k rpms. I can the tach jolt badly downwards when this happens. It feels like someone is bumping into the car it's so noticeable. I didn't replace all those parts at once but through diagnosis of running codes when I bought the car 4 months ago.
Plugs look pretty clean for 400 miles on them. No oil and no fouling. I checked spark at each wire. Odd though how only about 1 wire seemed to make a difference when I pulled it (idle drop) but it had spark. Exhaust doesn't smoke at all and no coolant loss etc.
If anyone needs more info just ask and I'll provide. Car is pretty ticked off right now.
Thanks in advance!
.
-------------------
Short story--
New distributor and all things related to it
New coil (old one used to rule out new one)
New Ford 9mm wires (only about 300 miles on them but you never know)
New Autolite 25s
All vacuum lines are new/checked
*13 timing advance
New IAC
New O2s
New map sensor
New intake gaskets
New TPS sensor and set correctly
Base idle reset
Codes pulled and repairs made.
Car is still SD (88 GT) The car misses randomly and badly during cruise and especially around 1,200 to 3k rpms. I can the tach jolt badly downwards when this happens. It feels like someone is bumping into the car it's so noticeable. I didn't replace all those parts at once but through diagnosis of running codes when I bought the car 4 months ago.
Plugs look pretty clean for 400 miles on them. No oil and no fouling. I checked spark at each wire. Odd though how only about 1 wire seemed to make a difference when I pulled it (idle drop) but it had spark. Exhaust doesn't smoke at all and no coolant loss etc.
If anyone needs more info just ask and I'll provide. Car is pretty ticked off right now.
Thanks in advance!
.