Cougarfetish
Registered User
Hello all, I appreciate any help you can give me, this quote is from my previous thread titled "Hesitation at WOT". I decided to start another thread, because I'm not really diagnosing a WOT problem anymore, it's just a general misfiring going on.
When I am in idle, the car will misfire here and there, dropping down to 600rpms or so. When I rev it up it runs fine, but if I try to put it in gear at all it's immediately chugging out. Vac pressure at idle is approx 18psi, and drops to 17psi when misfire happens.
So I have now changed wires and plugs, and tested DIS and Coil. What else could be doing this?? Can anyone tell me if the readings I received are normal? Anyone have any other ideas? Alternator? I've had to change the battery out and charge it a couple of times over the last couple weeks while diagnosing some other problems, but I figured that would just be from not driving it.
I'm planning on heading out of town with the car on thursday, so I would appreciate any help! This was just supposed to be an easy sparg plug change
Thanks in advance,
-Derek
When I am in idle, the car will misfire here and there, dropping down to 600rpms or so. When I rev it up it runs fine, but if I try to put it in gear at all it's immediately chugging out. Vac pressure at idle is approx 18psi, and drops to 17psi when misfire happens.
Just to clarify again:
All plugs are brand new NGK G-Power. Fuel filter is new. And wires have been replaced with Beldon Premium wires.
UPDATE OF WORK DONE:
Today we tested the wires coming from the DIS thanks to a helpful 11pg posting called "Weird ____ - Experts Help" (Can't remember exactly).
The DIS seemed to be acting normal AFAIK. With key in "on" position, ground pin (7) on the DIS read 12V so it's good. Pins 8,9 and 11 all read 9.37 on the automatic setting of my multimeter. Turned the car on and probed the same wires with a test lamp. Light blinked normally on all wires, even when car was chugging out. Turned the car off.
The DIS seemed like it was just fine, so we moved on to check the resistance in the coils. In the other thread they said to test them as pairs:
A B C
A B C
Like so. The ohm readings are as follows:
A = 14.11
B = 14.22
C = 14.16
I assume that is close enough to being normal? So can anyone make some sense of that, or does it help narrow it down any? I just thought I may as well check while I'm waiting for the wires to come in.
Thank you all again for your continued help, the people in the thunderbird/cougar communities are one of a kind.
-Derek
So I have now changed wires and plugs, and tested DIS and Coil. What else could be doing this?? Can anyone tell me if the readings I received are normal? Anyone have any other ideas? Alternator? I've had to change the battery out and charge it a couple of times over the last couple weeks while diagnosing some other problems, but I figured that would just be from not driving it.
I'm planning on heading out of town with the car on thursday, so I would appreciate any help! This was just supposed to be an easy sparg plug change
Thanks in advance,
-Derek