Bouncy Idle
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Senior User
Joined: Mar 2014
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From: Tyler, TX
Bouncy Idle
I have been having this problem for a while now and have finally decided to get to the bottom of it. My trucks idle will go down about 100 rpm every 10-15 seconds or so and the truck will compensate accordingly, but this happens any time I am idling. The truck will also bog down when braking and the idle will drop down to 480-500 and then jump back. I can also hear what sounds like one injector going bad. I replaced the injectors with Rosewood stage 1.5's 1600 miles ago and it was having the same problem but less pronounced before I switched them. I just checked my idling fuel pressure and it was about 50-55 and the pump was replaced with a stock delphi. I talked to my friend who is a ford diesel mechanic and he said the problem is lack of fuel or oil getting to the injectors. Are there any other possible causes or ways to fix this? And how can you check the high pressure oil easily? I have a 5000 psi gauge that I can rig up.
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Senior User
Joined: Mar 2014
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From: Tyler, TX
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Hotshot
Joined: Aug 2006
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Replace what ?
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Hotshot
Joined: Aug 2006
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Do one thing at a time if you don't have a scanner . Unplug the ICP sensor & look for oil in the connection .
Then try starting it with the sensor unplugged.
Then try starting it with the sensor unplugged.
Hotshot
Joined: Aug 2006
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IPR o ring is usually a warm oil issue . Good luck
Logistics Pro
Joined: Mar 2007
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From: knoxville, tn
It shouldn't start with the IPR unplugged. The ICP should be unplugged when starting. I know there are lots of three letter acronyms and it is easy to mistake one for the other. The ICP is on the driver head at the front, close to the lift ring.
You can hook your gauge up by removing one of the oil galley plugs along the inside of the head.
You can hook your gauge up by removing one of the oil galley plugs along the inside of the head.