Have been fighting with my fish (318) for a while now.....
My problem is an erratic idle.....from what I was told the engine was rebuilt 10-15k ago to stock specs, except for a double roller timing chain, internally. It has an edelbrock performer intake manifold and an edelbrock performer 750 cfm (#1407) 4v carb, electric choke (which is working).
The car has a brand new engine wiring harness, electronic control unit, voltage regulator, ballast, coil. All have checked out after being tested.
Also, a reman distributor with new pickup and reluctor was installed yesterday.
Checked for vacuum leaks and found none....
Compression is about 145 when hot acorss all cylinders and the yseem to hold compression.
Timing when I got the car was set at a huge 18* initial.......I tried setting total timing to 38*, which left the initial timing at around 14 I think it was.
At 4, 6 8 & 10 degrees initial timing the idle doesnt change much but the throttle response is HORRIBLE......very boggy.........so I bumped it back up to around 10-12 * and the reponse is somewhat better but still boggy and the idle is the same.......
SO, figuring ignition and timing is ok, I moved on to carb.
I found that the IMS didnt have a huge affect on the idle....found that could be due to too high idle rpms, so I made sure it is at around 800 in park at idle. I can get a very small change to happen with the iMS screws but the engine still idles poorly.
First tried going from the orange springs for the metering rods to blue. No change....then went up to the pink springs and no difference I could percieve.
One other thing I noticed that it is doing....it idles rough and lumpy and at about 800 rpm.....if I gas it a few times the rpms stay high , around 1300-1400....if I tweak the throttle screw back just a hair the rpms drop right back down.....(and the linkage isnt binding or anything)......
Manifold vacuum at 800 rpms is measuring 4-5" hg .......when I drop it into gear, rpms go to 400-500 and like 1" HG of manifold vacuum...........the engine just wants to die....
I feel like I am going in circles....
Was thinking about checking the float settings but I cant find the gaskets locally and have to order them...not sure if I could pull the airhorn assembly and check the floats and jets etc and then reassemble without new gaskets or not.,
I just feel like I must be missing SOMETHING.....
......could my control module be hooked up wrong somehow? The (new) wiring harness I have had plugs for the 5 pin control unit and the 4 pole resister......I figured if I had any of that stuff wrong it wouldnt run at all...
Any ideas?
My problem is an erratic idle.....from what I was told the engine was rebuilt 10-15k ago to stock specs, except for a double roller timing chain, internally. It has an edelbrock performer intake manifold and an edelbrock performer 750 cfm (#1407) 4v carb, electric choke (which is working).
The car has a brand new engine wiring harness, electronic control unit, voltage regulator, ballast, coil. All have checked out after being tested.
Also, a reman distributor with new pickup and reluctor was installed yesterday.
Checked for vacuum leaks and found none....
Compression is about 145 when hot acorss all cylinders and the yseem to hold compression.
Timing when I got the car was set at a huge 18* initial.......I tried setting total timing to 38*, which left the initial timing at around 14 I think it was.
At 4, 6 8 & 10 degrees initial timing the idle doesnt change much but the throttle response is HORRIBLE......very boggy.........so I bumped it back up to around 10-12 * and the reponse is somewhat better but still boggy and the idle is the same.......
SO, figuring ignition and timing is ok, I moved on to carb.
I found that the IMS didnt have a huge affect on the idle....found that could be due to too high idle rpms, so I made sure it is at around 800 in park at idle. I can get a very small change to happen with the iMS screws but the engine still idles poorly.
First tried going from the orange springs for the metering rods to blue. No change....then went up to the pink springs and no difference I could percieve.
One other thing I noticed that it is doing....it idles rough and lumpy and at about 800 rpm.....if I gas it a few times the rpms stay high , around 1300-1400....if I tweak the throttle screw back just a hair the rpms drop right back down.....(and the linkage isnt binding or anything)......
Manifold vacuum at 800 rpms is measuring 4-5" hg .......when I drop it into gear, rpms go to 400-500 and like 1" HG of manifold vacuum...........the engine just wants to die....
I feel like I am going in circles....
Was thinking about checking the float settings but I cant find the gaskets locally and have to order them...not sure if I could pull the airhorn assembly and check the floats and jets etc and then reassemble without new gaskets or not.,
I just feel like I must be missing SOMETHING.....
......could my control module be hooked up wrong somehow? The (new) wiring harness I have had plugs for the 5 pin control unit and the 4 pole resister......I figured if I had any of that stuff wrong it wouldnt run at all...
Any ideas?
