Author Topic: Water decoking an IDI engine? (Read 5072 times)

GTD. · « **on:** December 20, 2004, 08:20:28 am »

I know a petrol engine can be decoked by removing a vacume line and putting it in a jar of water when the engine is hot and running allowing the water to be drawn into the carb or throttle body and flash boiling in the combustion chamber clearing out the combustion chamber.

Colud the same be done with a IDI diesel, possibly by using washerbottle and pump attached to the pipe that comes off the manafold inlet elbow? (pipe 16 in diagram below) and would normally go to the boost pressre enrichment diaphram on top of the diesel pump or would this cause the engine to become hydrolocked?

Cheers

srivett · « **Reply #1 on:** December 20, 2004, 01:24:03 pm »

There aren't any throttle bodies on the diesel so you could just remove the air filter and spray in there with a window washer bottle. I don't know if it's okay to do or not. I have heard that some diesels do run water injection though.

Steve

chrissev · « **Reply #2 on:** December 20, 2004, 04:22:19 pm »

Quote from: "srivett"

There aren't any throttle bodies on the diesel so you could just remove the air filter and spray in there with a window washer bottle. I don't know if it's okay to do or not. I have heard that some diesels do run water injection though.

Steve

water cannot be compressed. Hence, it is possible that, if you get too much in your cylinders, you will bend your connecting rods. I would advise caution. A diesel runs at roughly four times the compression of a gasoline engine. You don't want too much water in there.

jtanguay · « **Reply #3 on:** December 21, 2004, 03:10:18 am »

go get some quickstart and spray that into your intake. Didnt work for me though

lol -30C sucks!!! I hope to get my car started when the weather gets to around -10C.... im affraid if I keep trying to star the engine my starter is going to die

chrissev · « **Reply #4 on:** December 22, 2004, 07:59:18 pm »

Quote from: "jtanguay"

go get some quickstart and spray that into your intake. Didnt work for me though lol -30C sucks!!! I hope to get my car started when the weather gets to around -10C.... im affraid if I keep trying to star the engine my starter is going to die

Find a big hill and just push it down. Then put it in second gear, let out the clutch, and wait. It will run. Might take a bit, but they always start that way.

jtanguay · « **Reply #5 on:** December 23, 2004, 02:09:41 pm »

hehe I like the idea. One thing I cant understand is why the 1st gear has a 'lock' in it... is that because the engine could possibly over rev when doing this type of start???

Now all I have to find is a nice steep hill...

Dr. Diesel · « **Reply #6 on:** December 23, 2004, 04:28:14 pm »

i think we lost the point of this thread. I would imagine that done in moderation, 'steam cleaning' would work just as well on an IDI as a gasser.

chrissev · « **Reply #7 on:** December 23, 2004, 10:34:12 pm »

Quote from: "jtanguay"

hehe I like the idea. One thing I cant understand is why the 1st gear has a 'lock' in it... is that because the engine could possibly over rev when doing this type of start???

Now all I have to find is a nice steep hill...

Yeah I wouldn't use first. Too low a gear. The lock is probably to keep you out of first when you are going more than a certain speed. When my old diesel rabbit wouldn't start in -25 degree January weather I used to call a guy I knew to come and push it with his pickup truck, and I would just let out the clutch in second while he was pushing and it would start that way. Got to love those old rubber covered steel bumpers

jtanguay · « **Reply #8 on:** December 24, 2004, 06:03:10 pm »

o yea.... rubber bumpers are the way to go. These days none of the newer cars can even tap other cars or the cold will just crack the plastic garbage