Idle rattle?
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Junior User
Joined: Jun 2007
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Idle rattle?
Hi again,
I've got a bit of a rattle at idle, that's the best way I can explain it anyway. I just put in new injectors and return line, added a ram air, and 3.5 exhaust on my '93 7.3 na. I searched and saw some stuff about the idi rattle. Is this common? Only does it at low idle when warm, if it's at cold idle I don't notice it. Runs good other than that.
Warm idle is around 500, seems a bit low and fluctuates a little? Cold idle is about 700-900, these are off the stock tach which I know is very erratic. I'm wondering about either the timing or possibly the pump? I've had the truck several months now. It was bone stock when I got it. Smoked a good bit at first. After the intake and exhaust it really cut back. After the injectors it only does it under a heavy load towing. Has 145000 on it.
Thanks for any info/opinions.
Steve
I've got a bit of a rattle at idle, that's the best way I can explain it anyway. I just put in new injectors and return line, added a ram air, and 3.5 exhaust on my '93 7.3 na. I searched and saw some stuff about the idi rattle. Is this common? Only does it at low idle when warm, if it's at cold idle I don't notice it. Runs good other than that.
Warm idle is around 500, seems a bit low and fluctuates a little? Cold idle is about 700-900, these are off the stock tach which I know is very erratic. I'm wondering about either the timing or possibly the pump? I've had the truck several months now. It was bone stock when I got it. Smoked a good bit at first. After the intake and exhaust it really cut back. After the injectors it only does it under a heavy load towing. Has 145000 on it.
Thanks for any info/opinions.
Steve
Junior User
Joined: Jul 2007
Posts: 56
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From: Regina, Sask
Dwaymar has it right on the mark. I believe that the higher pop pressure of the new injectors has the net effect of retarding your timing. Get the timing set & adjust the hot idle speed to minimum of 650 rpm. Some like the low rpm a little higher like around 750. Hope this helps, Cheers Rick
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Junior User
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Well I think I figured it out. I screwed up my homeade ram air when I changed the injectors, and I think I was starving it for air. When not moving, it was drawing in mostly warm air from the engine compartment, and I think that was enriching the mixture enough that it was causing the rattle/rough idle. I fixed it, and it seems to be running much better.
I never got around to changing the timing, don't think I'll need to. I did look at it though, and for the life of me I could not figure out how to get to one of the 3 bolts. The one on the bottom passenger side. Anybody have tips on how to get to it?
Thanks for the help,
Steve
I never got around to changing the timing, don't think I'll need to. I did look at it though, and for the life of me I could not figure out how to get to one of the 3 bolts. The one on the bottom passenger side. Anybody have tips on how to get to it?
Thanks for the help,
Steve
Senior User
Joined: Mar 2006
Posts: 201
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From: San Carlos, CA
I took a 9/16" 12 point "s" shaped box end wrench and ground it down to the right thickness to squeeze between the IP and bolt and then I put it into a vice and heated up the wrench with a torch with a propane torch and bent it to the right angles to get around everything. There was a little bit of trial and error getting the right shape (almost looked like a Z or steps from the side but the wrench bends pretty easily once it's heated up. This was a great tip from one of the board gurus.
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Cargo Master
Joined: Nov 2003
Posts: 2,585
Likes: 1
From: Duluth, Mn.
You really should have the engine properly timed. It can make all the differance in the world. Power, and fuel economy are greatly effected by slight timing variances
Last edited by fonefiddy; Sep 22, 2007 at 06:31 AM.
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