94 rough idle
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
94 rough idle
You guys are just BADAZZ! I swear, I have been reading so much stuff I am confusing myself. 
My 94 starts just fine, as long as the batteries are charged up, but man it surges and idles horribly until it warms up. Once it warms up it is fine, still hear a slight surge, very faint you have to listen for it, but that is it. No smoke and no power loss, goosier than hell to be honest. Just horrible start-up. Ideas? Injectors? Injection pump? GP or GP controller?
GOT ME! You guys are the experts so lets hear it!
John
My 94 starts just fine, as long as the batteries are charged up, but man it surges and idles horribly until it warms up. Once it warms up it is fine, still hear a slight surge, very faint you have to listen for it, but that is it. No smoke and no power loss, goosier than hell to be honest. Just horrible start-up. Ideas? Injectors? Injection pump? GP or GP controller?GOT ME! You guys are the experts so lets hear it!
John
Cargo Master
Joined: Feb 2008
Posts: 3,409
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From: back in SE Iowa
it could be glow plugs but it kinda sounds like the ip needs a good cleansing. try taking the fuel filter off and filling it up with diesel kleen ,put it back on and restart it and let it run about 20 seconds then shut it down and let it sit for a couple hours and then start it back up and take it for a good drive and be a little abusive with it.
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Elder User
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From: Tulsa, OK
Yep, light goes out. Clicking then BOOM! Off and running. Just surging and there is no smoke. Had a guy tell me to change the injectors. But it runs so damn good when it is warmed up. So good it can and does spin the tires if I tell it to.
Cargo Master
Joined: Feb 2008
Posts: 3,409
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From: back in SE Iowa
try the diesel kleen thing i described above.i think that may help your problem and you can dump a quart of atf in the fuel as a conditioner as well.or run seafoam through the tank.i think the ip is gummed up a little.it sounds like the cold start isnt working right
Cargo Master
Joined: Feb 2008
Posts: 3,409
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From: back in SE Iowa
oh crap my bad.the ip is the Injection Pump it is what controls the fuel to your injectors (more or less) it is the thing that all your injector lines run to.it also advances timing for easier cold starts and when you turn the key off on your truck it removes power to the ip to shut the fuel off therefore thats how your truck shuts off.im not really that great at explaining things.lol
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From: Tulsa, OK
Thanks Rupe
Well thanks for the suggestion Rupe, that wasn't it. I figured out I have a miss. I am learning diesels so I don't know squat..lol. Anyway, I played with what you told me to, it didn't work. I was about 2 gallons low on anti-freeze and about 2 quarts low on oil. Oil is still black. No oil residue in radiator or reservoir. I am wondering if it is not a cylinder or an injector. Don't know how to norrow it down to just one. Not like a gas where you pull a plug. I have lost anti-freeze in this truck before. I have replaced the water heater, heater core, needs replaced again it broke, also replaced the thermostat. Sometimes it will run hot, I shut it down, let it cool off and fill up w/water or anti-freeze again. It doesn't run rough all the time, just for about 5 minutes then no more surging, racing. Smoothes out except for that miss. Idling it always runs cold barely comes off the "C" driving about a quarter of the dial. It has gotten hot maybe 4 times. Compared to how much it was driven that is not much. Screwy for me, easy for you guys.
John
John
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Joined: Apr 2009
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From: Malahat/Cowichan Valley
john,
Did you do the diesel kleen in the fuel filter?? I didnt see it where you had done it. It sounds as if there is a sticking injector or a plugged/clogged injector. The diesel kleen treatment will work if it is not a structural defect. Just empty the fuel filter, fill it with diesel kleen, re install it. Start the truck and let it run for about 20-30 seconds to get some in the system, 5-10 for me since mine is crazy. then shut it off and let it sit for a couple hours. Upon re start, take it for a good ride, find a hill and you should see a difference. If that doesnt work, injectors may be in your future. Off chance of a timing issue but i doubt it. is this 94 turbod?
Did you do the diesel kleen in the fuel filter?? I didnt see it where you had done it. It sounds as if there is a sticking injector or a plugged/clogged injector. The diesel kleen treatment will work if it is not a structural defect. Just empty the fuel filter, fill it with diesel kleen, re install it. Start the truck and let it run for about 20-30 seconds to get some in the system, 5-10 for me since mine is crazy. then shut it off and let it sit for a couple hours. Upon re start, take it for a good ride, find a hill and you should see a difference. If that doesnt work, injectors may be in your future. Off chance of a timing issue but i doubt it. is this 94 turbod?
Postmaster
Joined: Apr 2008
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Okay, this is a long shot, but it happend to me several times already (#6 injector, then #3, then #6 again, then #5) so it may be worth a shot - with the engine cold spray some water (Windex spray bottles work great for this) around the injectors, you want it to get in the gap between the injectors and their seats in the heads. Then fire up the truck, and inspect all injectors, you're looking for tiny bubbles coming out of the wet areas. If you see bubbles the injector ain't sealed to the head good and you have a compression leak. First time this happened to me was good 200 miles from home with a race car on a trailer, I drove back on less than 8 cylinders and only found the compression leak by accident cause I overdosed the top if engine with degreaser in a can. Now if I ever develop a funky idle and some misfire the first thing I do is loosen the injector line nuts (so lines don't twist) and make sure the injectors are still tight in the heads, the torque for the injectors is 30lb-ft but that wasn't anywhere near enough to make any of mine seal good, and they all have new copper washes under them too...
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Surging while cold points to a sticky govenor for me, after the engine is warm the clearances increase enough that the govenor is no longer sticking.
As for the miss, just like a gas engine you isolate the cylinder.
On a gas motor you pull the spark plug wire looking for the one that makes little or no difference.
On a diesel you loosen the injection line so fuel is not injected into that cylinder, looking for the one that makes the least difference.
Same principle, different method.
As for the miss, just like a gas engine you isolate the cylinder.
On a gas motor you pull the spark plug wire looking for the one that makes little or no difference.
On a diesel you loosen the injection line so fuel is not injected into that cylinder, looking for the one that makes the least difference.
Same principle, different method.