Is this normal?
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Mountain Pass
Joined: Apr 2011
Posts: 117
Likes: 3
From: Bakersfield
Is this normal?
I have a 1993 E350 ambulance package non-turbo 7.3 IDI. The engine runs great does not smoke when idling, but what I'm wondering about is the noise it makes when I start it up. Upon first start up when the engine is cold it makes a very loud rattling sound and then once it warms up the idle kicks down and it becomes quiet. The loud rattling lasts for a minute or two or until it's warm enough for the idle to kick down. For the rest of the day as long as the engine is warm it runs without that loud rattling noise. No other problems with the engine...has plenty of power... no excessive smoke. My old 1985 F250 6.9 never made that noise so I was curious if it was an indication of a problem.
What do you guys think?
What do you guys think?
Cargo Master
Joined: Oct 2005
Posts: 2,301
Likes: 29
From: NJ
Yes, below approx. 120* the high idle solenoid and cold advance solenoid are energized. This gives you the high idle and the louder diesel knock or clatter. I believe they are there for easier cold starting. Personally I start mine without engaging the high idle (touching pedal) unless it's cold enough to need to give it more fuel. I figure lower RPM and such until it gets oil pressure is better for longevity.
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Mountain Pass
Joined: Apr 2011
Posts: 117
Likes: 3
From: Bakersfield
That's good to know! Btw, I never touch the pedal during the startup procedure. However, since my glow plugs aren't working right now, every morning I give it a very SMALL shot of ether and within a second or two of cranking it fires up. I get a puff of white smoke out of the exhaust, and then it clears up pretty quickly. when it's cold out it turns to steam. I'm hoping to get the plugs working again before it drops way down into the frigid 30's. (Sarcasm, California winter). I'll post about that problem in a little bit.
Thanks again for your input! :-)
Thanks again for your input! :-)
Lead Driver
Joined: Apr 2008
Posts: 6,945
Likes: 13
The louder diesel knock as said above, is totally normal. The timing advances a few degrees to help it run smoother when cold, decrease white smoke, and warm up faster. Starting with ether is fine unless it gets very cold where you are. I had an ether injector on mine for 4 years, but when temps hit zero or below, the ether wont atomize, and you get nada. Now that i have my new engine in, having a working GP system i can get to is a nice luxury. That said, the injector is still hooked up and i have a disconnect switch at the controller should i need to bypass it due to failure.
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