Question about fouled spark plugs
01-18-2007, 01:06 PM
#11
Banned
Join Date: Jan 2007
Posts: 956
RE: Question about fouled spark plugs
Wiring the 7 to fire in the 3s place would make the 7 fire way to early and most likely a back fire. It would be firing on the way up the compression stroke when the intake just closed or is closing. The 3 would fire way to late, almost on the bottom of the power stroke. It may run but like crap.
Boy that’s a stumper? I think I would start over, and start with a compression check. (pull coil wire) While you have all the plugs out pull a valve cover and see if the valves on 3-7 are going down as far as the rest, (out of adjustment, worn cam lob) If the compression is there, and the valves look like they are working fine, then move on to Fuel or electrical, (pick one)
Pick fuel, With the intake valve (rocker down ) wide open, and the spark plug out, get a air supply and put air down the carb it should come out the spark plug hole. If air comes out move on to carb, is the accelerator pump working, if so move on to electrical. Check firing order and rotation of rotor in distributor, wire the distributor in the direction the rotor turns when you hit the starter, check plug wire location on plugs from the distributors correct firing order.
If all this is ok and it still don't run, buy a Chevy.
Boy that’s a stumper? I think I would start over, and start with a compression check. (pull coil wire) While you have all the plugs out pull a valve cover and see if the valves on 3-7 are going down as far as the rest, (out of adjustment, worn cam lob) If the compression is there, and the valves look like they are working fine, then move on to Fuel or electrical, (pick one)
Pick fuel, With the intake valve (rocker down ) wide open, and the spark plug out, get a air supply and put air down the carb it should come out the spark plug hole. If air comes out move on to carb, is the accelerator pump working, if so move on to electrical. Check firing order and rotation of rotor in distributor, wire the distributor in the direction the rotor turns when you hit the starter, check plug wire location on plugs from the distributors correct firing order.
If all this is ok and it still don't run, buy a Chevy.
01-18-2007, 07:01 PM
#15
3rd Gear Member
Join Date: Jun 2006
Location: Northern Virginia
Posts: 528
RE: Question about fouled spark plugs
ORIGINAL: 85lebaront2
Is yours an automatic? If so see if your vacuum modulator is bad, it will give weird results like you are describing.
Is yours an automatic? If so see if your vacuum modulator is bad, it will give weird results like you are describing.
01-26-2007, 04:02 PM
#16
1st Gear Member
Join Date: Nov 2006
Location: Newport News, Virginia, USA
Posts: 143
RE: Question about fouled spark plugs
Sorry guys, hadn't been on in a while. Bad modulator, easiest, if you can get underneath, is pull the short hose off, if transmission fluid runs out, it's bad. If you have a vacuum tester, it is just like a vacuum advance, apply vacuum and see if it holds, 15" should be enough to check it. If you are slowly lossoing transmission fluid and don't see any under the car that is another good sign.
01-26-2007, 04:46 PM
#18
5th Gear Member
Join Date: Jun 2005
Location: Michigan
Posts: 3,986
RE: Question about fouled spark plugs
ORIGINAL: ZZmustang
What kind of intake manifold do you have.
Cylinders on opposite sides are doing the same thing make you wander about the runners in the intake
Take the carb off and remove that rag you left in there. Ha.
What kind of intake manifold do you have.
Cylinders on opposite sides are doing the same thing make you wander about the runners in the intake
Take the carb off and remove that rag you left in there. Ha.
-P.