timing/dieseling problem
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Joined: Dec 2002
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timing/dieseling problem
Hello All:
have posted on this topic before but could not find it so here goes my update.
since I last posted concerning problem w/ dieseling on my f100 1973/360 pick up I was informed that the source could probably have been the plugs, the condenser, points or the distributor cap. Well, all these have been replaced and still got the same problem.
My dad and I ran a compression check and discovered low pressure in cylinder 4 and 6.
Also, there appears to be a leak between the in-take and the head. We discovered this when we blew propane near the seal and the engine reved up automatically as it had when we blew propane directly into the carb.
The carb and in-take are edelbrock. the engine was rebuilt about 6 k miles ago (I've owned the pick-up for about 400 miles). Supposing the rebuilt was done appropriately I'm hoping a replacement of the gaskets between the carb and the manifold and the manifold and the head will do the trick and keep my pick-up from dieseling and keep it in time as well.
What are your thoughts on this?
have posted on this topic before but could not find it so here goes my update.
since I last posted concerning problem w/ dieseling on my f100 1973/360 pick up I was informed that the source could probably have been the plugs, the condenser, points or the distributor cap. Well, all these have been replaced and still got the same problem.
My dad and I ran a compression check and discovered low pressure in cylinder 4 and 6.
Also, there appears to be a leak between the in-take and the head. We discovered this when we blew propane near the seal and the engine reved up automatically as it had when we blew propane directly into the carb.
The carb and in-take are edelbrock. the engine was rebuilt about 6 k miles ago (I've owned the pick-up for about 400 miles). Supposing the rebuilt was done appropriately I'm hoping a replacement of the gaskets between the carb and the manifold and the manifold and the head will do the trick and keep my pick-up from dieseling and keep it in time as well.
What are your thoughts on this?
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
timing/dieseling problem
The leak between the intake and the head may mean that your heads and or block was milled too much and the intake manifold needs to be machined to fit. That leak is causing your dieseling problem. It is like holding the throttle open and shutting off the engine. It is also leaning out the mixture and may have burned some valves. Burned valves heat up and cause dieseling and preignition.
