Cold Start Idle Surge
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Senior User
Joined: Jan 2004
Posts: 240
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From: Illinois
Cold Start Idle Surge
800 miles thus far on the truck
Cold started it today @ 29 degrees (F) and it started but the idle just started surging up and down for about 10 seconds, and I saw white smoke. It let more white smoke out again when I started it up 20 minutes later. What's the deal?
Cold started it today @ 29 degrees (F) and it started but the idle just started surging up and down for about 10 seconds, and I saw white smoke. It let more white smoke out again when I started it up 20 minutes later. What's the deal?
Senior User
Joined: Dec 2003
Posts: 132
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From: Eagle River, AK
Never heard of Romp hunting, what is that? As for the idle surge, in the cold if the engine does not surge the water does not circulate and heat the inside of your truck! It is nice to get a warm truck when it -20 way up north! Have not had a probelm with the surge. Not sure of white smoke, I know when it is cold that when you are in the throttle that the truck produeces a lot of smoke, but when you let off it is gone.
04, 6.0l, FX4, crew, srw auto and lovin it
04, 6.0l, FX4, crew, srw auto and lovin it
Freshman User
Joined: Dec 2003
Posts: 45
Likes: 0
From: North Shore MA
Hunting is an RPM swing as the engine is trying to maintain speed. Mine does this when it is really cold for the first 30 to 40 seconds until they engine gets a little heat to get proper combustion
Last edited by Six Liter Fan; Feb 9, 2004 at 02:57 PM.
Postmaster
Joined: Dec 2003
Posts: 3,359
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From: Dallas
The variable geometry turbocharger at cold tempratures closes the vanes to increase backpressure so that there will be a quicker warmup. I'm guessing that as pressure builds along with temperature the vanes open then close in response to temperature changes. This would explain the romp. It doesn't seem to be a problem after warmup or on warm days. This engine has some really complicated parts. I don't see how they expect it to last 200K miles.
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Freshman User
Joined: Dec 2003
Posts: 45
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From: North Shore MA
Bob, "Hunting" happens on all diesels. It is the nature of the ignition event in the diesel. The heat of comression causes ignition and when the cylinders are super cold, combustion is far from perfect. People sometimes use starting fluid to help this. No glow plug engines have even harder times and sometimes refuse to start, but these are typically industrial/ marine engines who use heaters in the water jacket to prevent this.
Hunting also happens on no load conditions if you block off enough of the inlet.
Hunting also happens on no load conditions if you block off enough of the inlet.
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Postmaster
Joined: Dec 2003
Posts: 3,359
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From: Dallas
Six Liter Fan - The Romp that is a pain in my D-8 Cat is not acceptable in my $40K 6.0 daily driver especially when my 7.3, the '89 Ford Diesel and even my sorry 83 Caddilic never offered to romp. Ford engineers tried to be cute on this truck. The air management system is nothing like anything ever seen before. Everything depends upon all semsors and valves working perfectly. I have had no trouble with my 6.0 yet but as complicated and fragile as they are, I don't see how they will last the 250,000 miles I have come to expect.
