Timing not advancing
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Joined: Sep 2012
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Timing not advancing
I have a 97 f250 with the 351W. I've had power issues since the day I bought it and have now narrowed it down to an issue with the timing. At idle, with the spout plug in, the timing is sitting at 20 degrees but does not advance when given throttle. At idle, with the spout plug removed, the timing is at 8 degrees but still doesn't advance under throttle. In both instances there is no change in how the truck idles or responds to throttle. I'm not sure if this is a distributor issue, a pcm issue, or a combination of both. I tried running a scan tool on the truck but, the computer won't communicate with the tool which makes me lean more towards a faulty computer. Anyone else had this issue or have a way to pin point which one it is?
Elder User
Joined: Nov 2009
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From: Chicago area
Since you truck is computer controlled the timing/ignition advance is controlled by the computer. All you do is set the base timing, in your case 8 deg. The fact that you get a 12 deg. jump when you plug in the spout connector tell me that the computer is doing something to the timing.
Do you have a timing light, preferably one with a dial that allows you to dial back the light to TDC. Then you can just read the advance on the dial on the light.
Most 5.0L & 5.8L are set at 10 deg. My own 5.8L is liking 13-14 deg. base timing.
Do you have a timing light, preferably one with a dial that allows you to dial back the light to TDC. Then you can just read the advance on the dial on the light.
Most 5.0L & 5.8L are set at 10 deg. My own 5.8L is liking 13-14 deg. base timing.
Thread Starter
|
New User
Joined: Sep 2012
Posts: 21
Likes: 0
Since you truck is computer controlled the timing/ignition advance is controlled by the computer. All you do is set the base timing, in your case 8 deg. The fact that you get a 12 deg. jump when you plug in the spout connector tell me that the computer is doing something to the timing.
Do you have a timing light, preferably one with a dial that allows you to dial back the light to TDC. Then you can just read the advance on the dial on the light.
Most 5.0L & 5.8L are set at 10 deg. My own 5.8L is liking 13-14 deg. base timing.
Do you have a timing light, preferably one with a dial that allows you to dial back the light to TDC. Then you can just read the advance on the dial on the light.
Most 5.0L & 5.8L are set at 10 deg. My own 5.8L is liking 13-14 deg. base timing.
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