93 no start

[12vsvo]

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I have a stock 93 auto with 200,000 miles. I've run it on vegetable oil for 1&1/2 years. It got to where it wouldn't idle when hot on diesel. And going down the interstate on diesel it would die if I let of the accelerator. Now I can't get it started. Just some white puffy smoke comes out.

I tried cranking and spraying intake/carb cleaner(that's all I had, should I try ether?) in the intake manifold. She started coughing a little but no start.

Could it be the injector pump bad even if I have fuel going to the injectors? Maybe not enough pressure to open the injectors? What about the injectors themselves? Or low compression? What should I check???

thanks

jason

[KTA]

Yes it sounds like your injection pump is bad, sorry. It is most likely due to lack of lubricity, contaminates, or just plain the excessive lubricity of the what i am guessing was waste vegtable oil.

[swank]

the excessive lubricity of the what i am guessing was waste vegtable oil.

can you explain this one a little, brian?

[Falcon]

the excessive lubricity of the what i am guessing was waste vegtable oil.

can you explain this one a little, brian?

Too much gouie makes gluey?

[KTA]

Old brain damaged here meant excessive VISCOSITY not lubricity. I had to type that one twice because the thing locked when I posted so I messed it yp not paying attention.

[Begle1]

Coked injectors couldn't cause that?

Surprised the problems were at operating temperature.

[dpuckett]

Yes, and I'd venture to guess the excess viscosity mad efor less lubricity.

DP

[Begle1]

Higher viscosity makes less lubricity?

I've never heard that one...

Provided that the oil isn't heated sufficiently, then it will be thicker and put more of a strain on the pump. But even if it's a sludge, I'd think that it's a good bit slippier than #2. Details of your SVO system would be nice, so I can steal them. (And, er, help clear the veggie of any potential wrongdoing in this situation.)



Has anybody had these symptoms before? Why would the injection pump stall only at temperature and idle?

If it runs fine until it drops to idle, runs rough at idle and smooth under pedal, and makes white smoke while cranking, I'd tend to think the governor's gone wonky and is overreacting under low boost conditions. Of course, if it's knocking and smoking all the way through the powerband, then it's probably a more general problem. But it sounds like the pump is working fine when it's working.

[KTA]

Internal clearances in the pump get looser as it gets hot, therfore it allows more fuel to bypass and it cant build pressure. At more rpms the bypass isnt an issue bacuse things move fast enough to work. Tell tale sign of a bad pump is a no start hot condition. Clearances in and injection pump are VERY tight. If the fluid is too think it wont enter the small clearances and therefore it wont lube. If you run 90W in an auto tranny you will kill it too, same reason.

[12vsvo]

I run a two tank system with fuel/coolant hose on hose from the tank. Then a heat exchanger with my tranny fluid. But I doubt it's getting much hotter than 150-170* by the time it gets to the IP.
I've sucked a lot of air through the pump with clogging filters and such.
I just got a used IP off a 90 mod. wrecked truck ($550). I hope it works. A shop told me to check my valves. So I'm going to do that first and a few other things first.

[12vsvo]

I'm in the process of changing out my old IP with the used 90 model. Do I have to put no. 1 at TDC like the book says? Or can I just turn the replacement pump shaft to index with the key way in the gear, since this pump is not indexed like a factory replacement?

[wannadiesel]

You can line it up however it will fit.

[12vsvo]

Well I got the IP put on. It started a couple of times, but it revved up on it 's own to full throttle! I didn't have the KSB pluged in(which is differet than the late model one). So I tried hooking up the KSB srait to the battery but it started geting HOT!? What should I do?

[wannadiesel]

Power screw is in too far, back it out some. KSB is not involved here.

[12vsvo]

Ok, I backed off the power screw, re-bled the lines, and no start. What should I do with the KSB? Also, I put in a pressure gauge between the lift pump and the filter. It pumps up to 7psi or so but bleeds down to 0 in a few seconds. Is that normal? One time I removed the filter, it was half full. The past couple times it's been full.

thanks for all your help