Is it possible to over-advance the IP?

[discbrks]

This afternoon I advanced the IP in hopes of the truck running better after my injector change last weekend. Now I can't get the truck to start. I had to remove all 8 lines from the tops of each injector. I also loosened the top 4 lines (that I could get to) on the IP. And I loosened the center fuel supply line on the IP. I got everything back together - but no start. I then remembered that I forgot to tighten the center supply line on the IP. Got it tight, still no start. I can't seem to get fuel at the injectors. Did I run all the fuel out of the IP by leaving the line loose? Or is it over-advanced? It's gotten dark, so it'll have to wait til morning.

 

[Diesel JD]

Its not too hard to over advance the timing, doing that isn't a good idea. I think you might have air in the system but being way too far advanced is also a possibility. If you want to see what gain is to be had by advancing the timing try advancing it about a dime's width or so from where it was when you had it static timed. If it won't start right, makes a harsh diesel sound, or smokes black excessively you may have gone too far. It is very possible for a good shadetree mechanic or home mechanic to get acceptable timing results by ear but for best results tools and the luminosity or pulse method should be applied.

 

[Russ]

make sure the fuel shut off wire is still attached to the pump, if your too far advanced you should still get fuel to the injectors

 

[Agnem]

Are you getting any smoke out of your exhaust? That will happen for sure regardles of the timing.

 

[discbrks]

I didnt see any smoke, but then again it was almost 9pm when I was trying to fire it up. There's not any "diesel" sound either. I'm getting 12v at the IP. I'm thinking that I ran the IP dry since I left the supply line loose and it all dumped in the valley. How much fuel does the IP hold? My elec. f/p is wired so that it doesn't run in "crank", so that might be why I'm having a hard time getting fuel. I think I'll hot wire my f/p so it runs continously, crack open all the injector lines, and spin it over - hopefully I'll see fuel. If its over advanced, will it still crank up? Just run crappy & black smoke?

 

[RLDSL]

My elec. f/p is wired so that it doesn't run in "crank", so that might be why I'm having a hard time getting fuel. I think I'll hot wire my f/p so it runs continously,

Bingo!
The pump HAS to run while the engine is cranking. That is a critical time. You have run the injection pump dry. Once you get your wiring straightened out, you should be fine.

 

[Diesel JD]

Yeah thats going to be a big problem. If its too far advanced enough to be a problem you'll notice a harsher diesel clatter when its running and it may be harder to start hot. You might also see excessive black smoke.

 

[discbrks]

You guys were right! Thanks! I wired the pump to run full-time, and within 3 minutes she fired off. I did have the Ip timing too high as it was barely puffing black smoke at idle. I've always heard 'adjust the timing a dime's width at a time' - I guess I should of followed that advice. I fell victim to the 'if a little is good, more MUST be better'. After backing the timing off a dime's width, no smoke at idle. It does smoke when I rev it up. Is that normal or do you think I still have the timing too high? Also, the lopey idle is still there. After getting up to temp, I cracked each inj. line while running to try to isolate the lope. Every injector really made the motor really miss when I cracked the line. So I couldn't isolate the lope. Maybe that's the nature of the G codes until I can get the turbo on. Any ideas?

 

[Agnem]

You really need to get it dynamically timed properly to get maximum power and economy. Otherwise, your just guessing and possibly leaving power and fuel savings on the table.

 

[discbrks]

You're right Agnem... I gotta find a good diesel shop around here. Any other shop, when I ask them if they can time the truck they give me that deer in the headlight look... as if they have no clue what I'm talking about.

 

[RLDSL]

Where is here, you may be near someone who has a timing setup. If not, for about the price of one timing job , you can buy a Ferret and with that and an advance type automotive timing light yo can time the thing yourself and you'll have the thing for next time.

 

[sassyrel]

disc--you need to put your location in your avatar--someone might be close enough to help you-----

 

[discbrks]

Yeah, location might help, huh? Sorry 'bout that. I'm in Columbus, GA... about 100 miles south of Atlanta right on the GA/AL line.