cold starting problems
Thread Starter
|
Junior User
Joined: Apr 2007
Posts: 95
Likes: 0
From: Wolfe City TX
cold starting problems
93 F-250 NA. It starts great when block heaters are used. The glow plugs all checked good. When the truck is cold (sitting in 45 degree all day at work) I turn the key the glow plug light comes on for about 5 seconds and then the glow plugs start cycling. I try to start and it turns over for quite a while before it starts. (a lot longer than when it starts warm) Has white exhaust smoke for a bit while I drive out of the parking lot and then clears up. The last time I had this problem I had two glow plugs which checked bad but they all checked good this time. Any Ideas???
Thread Starter
|
Junior User
Joined: Apr 2007
Posts: 95
Likes: 0
From: Wolfe City TX
I think they are all motorcraft. When I checked them last night they all looked good with the test light and the light was just a bright as connecting directly to a good ground. I also used the test light and saw that the voltage was going to the glow plugs but the engine was warm when I got home so it went directly to the pulsing mode.
Thread Starter
|
Junior User
Joined: Apr 2007
Posts: 95
Likes: 0
From: Wolfe City TX
Well I rechecked the glow plugs with a meter and 4 read 0.8 ohms, one read 0.3 ohms, and three read 35.0+ ohms. So now I don't trust the test light anymore. Now they all read good and the timing for the glow plugs is about 10 seconds then they start cycling. I think all is well. I will recheck how it starts after work tomorrow when the engine is really cold. The engine is now still about 80 degrees from driving home today. Thanks for the responses!!!
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
haroldrussi,
Welcome to FTE and the IDI forum.
Using an ohm meter is better than a test light.
But the test light is also a fast easy test.
It just don't pick up on high ohm plugs like a meter does.
.5 ohm plugs are drawing 288 watts
35 ohm plugs are drawing 4 watts
So you are getting 1140 watts less heat in the engine than you should be.
So when it starts 3 cylinders are either not or barely firing, which is where the white smoke is coming from.
Welcome to FTE and the IDI forum.
Using an ohm meter is better than a test light.
But the test light is also a fast easy test.
It just don't pick up on high ohm plugs like a meter does.
.5 ohm plugs are drawing 288 watts
35 ohm plugs are drawing 4 watts
So you are getting 1140 watts less heat in the engine than you should be.
So when it starts 3 cylinders are either not or barely firing, which is where the white smoke is coming from.
