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I have a 2006 Cessna 182T and it is hard to start when hot. When it
is very hot (5 minutes or less from shut down) it starts easily 1/4
inch throttle, crank and ease mixture forward. After 5 minutes and
up to an hour is where I am having the problem. The book says to
just leave off the prime. Doesn't work. The sales guy says -
deliberately flood the engine and then do a flood start. I don't
like this idea. Any other idaes would be appreciated.
-- Ken Fenner, August 21, 2008
I don't have direct experience with this engine, but one thing that I have noticed when hot-starting fuel-injected piston engines is that it is best to leave the fuel pump off. Just crank and advance the mixture. No priming, but more importantly no extra fuel pressure.
Have you tried starting without using the fuel pump at all?
-- Philip Greenspun, August 21, 2008
Thanks for the response. Yes the fuel pump is always left in the off position when starting. The pump is used for priming when the engine is cold, it is shut off before cranking. The operator handbook suggests leaving the pump/primg part out when the engine is hot and just start cranking and ease in the mixture when the engine starts. As I mentioned, this works well when th engine is very hot but doesn't work past five or ten minutes after shut down.
-- Ken Fenner, August 21, 2008
On the T182T it is a good idea of running the pump but DO NOT push in the mixture control, keep it pulled back. The reason to run the pump is that it cools the fuel by running it though controller and back to the tank. DO NOT prime, if you do you will have to leave the throttle all the way in until it starts. 1/4 throttle and no mixture until it begins to start.
-- john jones, August 29, 2008
We do not have that much of a problem with the NA 182T, but on the turbo model the HOT turbo heats the fuel lines and that is why you should run the pump for a bit, the fuel flow back to the tank will cool it.
-- john jones, August 29, 2008
I had lot of trouble at high altitude in a 182T (Buena Vista, CO) on a hot day, hot restart and almost drained the battery. I was already flooded, so I tried the flooded procedure with full throttle on the last attempt. Even when not flooded, the key is to advance the mixture VERY slowly. Millimeters per second. When it starts to fire, DO NOT cram it in, keep cranking a few more seconds, slow down the mixture advance until it really sounds like it's going to start. For lower altitude, try more than 1/4", but not full.
-- Todd Attebery, September 16, 2008
One other trick is, if you know you will need to start hot after flying, open the oil filler door and leave open until ready to start. It will let allot of hot air out of the cowl.
-- john jones, October 27, 2008
I agree - a flood start would probably be a last resort. After 5 minutes, vapor is developing in the fuel lines. As J.Jones says, opening the oil hatch (and cowl flaps) is a great way to increase ground cooling and shorten the time it takes for the vapor to dissipate.
Fuel injected engines all seem to have their idiosyncrasies, but I have had pretty consistent success with this technique: Crack the throttle a little wider (1/2" or even more), pull the mixture to idle cutoff (important!), and run the fuel pump for 4-5 seconds. This purges the lines of vapor without actually priming. Pump off, and then crank while very very slowly advancing the mixture, just as J.Jones says. Don't be afraid to open the throttle more when the engine starts to fire (to blast out any remaining vapor).
You might also take a look at how you're taxiing/shutting down after flight: keep the sparkplugs and injectors "clean" by leaning aggressively on the ground, and pulling the mixture to idle cutoff at a slightly higher rpm (1000 or more), for a quick clean shutdown. This helps reduce unburned fuel charges in the cylinders (which would otherwise produce more vapor).
Note: If you're still having troubles using this technique, you may have a mechanic check to make sure the fuel flow is truly cut off when the mixture lever is pulled aft. Even a little fuel trickling by the stop may be causing problems.
Hope this is helpful!
-- Jane Carpenter, December 28, 2008
Jane - I've tried this suggestion of yours a few times now and it works great!! Thank you. Ken
-- Ken Fenner, May 11, 2009
Awesome! Glad to be of some help! Blue skies, j.
-- Jane Carpenter, May 11, 2009
Don't forget to park it with the nose into the wind with the cowl flaps open if you are able. The oil door open also...just get the heat out and do a normal non prime start.
-- Max Rosenberg, May 26, 2009
My TU206G uses a fuel injected 520 Continental. I don't have experience with the Lycoming IO540, but this is worth a try, and works first try 99% of the time. This technique came from a member on Cessna Pilots Association forum for a hot start.
1. No prime or very short prime 2. Mixture full rich. 3. Engage starter and simultaneously start a Slow, Controlled advance of the throttle until the engine begins to start. Stop the throttle advancement at or just a hair past this point and the engine roars to life. Works at low or high altitude with a hot engine.
This seems to be at the point where the engine is getting just the correct amount of fuel/air mixture. Too far or fast on the throttle and it will over-rev a bit (over 800 RPM) or flood. I like y initial RPM at 600-800 RPM and it purrs like a kitty. Works great on my plane. Good luck!
-- Eric Whiteman, May 27, 2009
I have a non-turbo 2005 182T and when I was trained by by instructor-a 182 owner himself, that when I test the ignition cut off before shutting off the mixture at shut down, push the throttle in a bit as the engine cuts off. The idea being that you force fuel through the fuel lines and fuel injection. Supposedly, an earier start if you have to restart it hot. It's worth a shot. It is indeed fuel that is vaporizing in the lines when it's hot that causes the hard hot starts. Also, make sure you don't fry the starter. Give it a cool down if the first start doesn't light to engine up.
-- Dean Phillips, June 23, 2011
I have a T182T and I can tell you after flying and letting it sit for 5- 10 mins (like after fueling up at the pumps) it WILL NOT START unless I run the prime pump. To get it fired I have to prime it again. This is completely the opposite of what I had to do with a 172R on hot starts!
-- Steve Webster, September 25, 2013