Do it on a cold engine. Grab a good sized rag, fire up the truck and slightly loosen each inj. nut a bit. They should seriously squirt fuel out. If it just sorta fizzles a bit and you can't get it to squirt, close it and go on to the next. Do them all, and go back to the start.<br>If you find one that makes NO difference in truck idle quality, you have found one with a problem.<br>After a couple passes bleeding them, you should have gotten all the air out.<br>Use the rag with care and try to catch the fuel, no not let it near your eyes or skin, that would not be good since it's under high pressure.<br><br>bob.

 

If you do find some fizzing (air in the lines) then you need to look into how it is getting there -- some loose connection crack, etc. in a feed or return line . . .<br><br>Good luck, I hope it ends up being in-expensive.

 

ok i went out tonight finally!! and loosen each inj. nut they all spuirted fuel everywhere!! and each one when i loosend the nut maid the engine run like crap! and i changed fuel filter to!! and still no change!!! starts up chugges, white smoke until u rev it up a bit then it back fires then it runs. not still not very good! anymore things i should look for starting to really **** me off!! sorry! &gt;

 

i get up to go to work start the truck started it up and barely ran like it wasnt getting fuel then it started to come up to rpms. maybe rpms r not set high enough but would that explain white smoke? i have had the rpms set high before and normal and never had the chuggin and shakin or white smoke!

 

What do you mean it &quot;backfires&quot;?

I think that you need to check your fuel pressure/transfer fuel pump. I also think that you need to really check the injection pump, its feed, and return lines for leaks.

You could also just try for kicks on a warm day and cold engine taking the wire off of the fuel solenoid and cranking the engine over a few times to see if you have even compression on a cold engine across all of the cylinders.

It is remotely possible that your fuel pump was not timed correctly, and that you are running way too retarded. (or that the pump timing slipped somehow, probably not too likely, unless they left the key out or something).

If you are getting desparate, and are sure that there isn't something catastrophically wrong like a craked head, burned valve, etc. you could try advancing the pump say 3/16 of an inch (against the match marks) and see if it magically runs better. If it does, then you need to go back to your pump shop and have them check out the pump and set teh timing correctly.

 

ya backfires when u rev it up and let off the pedal POP! well its a new fuel pump and i just worked it last night and all seems well. thats what i was kind of thinkin the pump wasnt doing something right. how would i go about trying to set the timing on the pump?

 

If you have a diesel shop nearby, you could take all the injectors out and have them pop tested. They bolt them into a test stand and pump them up until they spray. there is a pressure gauge inline that tells what pressure that they pop off at as well as a spray pattern that can be seen at the same time. A dribbly injector can cause intermittant troubles, such as smoke or backfiring/poping. Just a thought, dont condemn the pump right off when you can do some tests to rule out other things. You may even do a compression test at the same time.<br> -RATCHET-

 

Well I had similar problems to you, except not as severe. Mine surged at idle badly right after inj pump change in 1995 under Recall #605. Dealer spent 12 hours on it and got nowhere - I was ready to sell it. I probably spent many more hours myself trying to learn diesel injection mechanics out of necessity. Finally I put clear PVC (very temporary) tubing in place of rubber lines to see what was going on. Bubbles were very severe on the return line and slight on supply line. Dealer had gotten that black flaky engine paint in the injector lines (my guess) that caused exhaust gas to backfeed the return manifold through one injector that would not totally close off. I later found that the supply pickup in tank was picking up same bubbles but not as bad as return line, short cycling. Discussion with dealer parts man: return line drops from top of tank in old design pick-up but goes to bottom of pick-up to minimize bubbles in new design. The fix was to add stong diesel cleaner and bleed. I had to change LP fuel pump shortly after due to low pressure causing bad cold idle. Remember that PVC tubing is not rated for diesel and should be considered a fire hazard to drive. That truck has not seen a dealer for 7 years now.

You can narrow down the bad injector causing gas leak by loosing inj nut with rag capturing fuel. That cylinder will not fire and bubbles should be highly reduced. The other five good injectors should have no effect.

 

ok i have another riddle for ya! driving today about 60mph and the truck just dies then u let up on the pedal it comes back to life drive about a mile and it would do it again!!!!! &gt; &gt; i have 15k on new injector pump and fuel pump just changed fuel filter. Any more ideas?????

 

Sure sounds like lack of fuel. The other test suggested to me was to disconnect Return fuel line and feed to a 4 liter bottle/pail. You should get at least 0.75 liters in 30 seconds at idle speed. This is a good test if you do not have banjo fitting for pressure guage. The LP lift pump is rated at 0.75 per 30 sec minimum at cranking speed. At idle flow is higher but portion is lost to firing engine and some leakage thru injectors to return manifold. Good luck. You could also phone a Bosch distributor from Yellow pages and they may help with sysmptoms. They rebuld them all the time and know them well. Forget Dodge and Cummins since they always send them to the Bosch agent.

 

well she took a poop this morning i was going to work and she just shut off!!! i pulled over popped the hood looked for any lines leaking fuel or anything tried to crank her just cranks! well i sat there for about 5 mins getting ready to call someone to come get me and i tried to fire her one last time starts right up!!! &gt; so i take off all the way to work and she dies and them comes to life again for about 25 miles till i park her in the back by the shop! going to try and get a new fuel pump and try that if thats not it its the injector pump cause its the same thing that happend to me last time when it failed!! shes not getting fuel properly!! if u give the pedal to much she falls on her face!! &gt; not a happy camper!

 

Darn, this sounds like a full blown poop alert here guys....

Ok, you said you had a new fuel pump... I'm assuming you mean a new lift pump.. yes???

If you have checked the connections on the fuel solenoid and they are ok, then maybe it's time to check the solenoid itself.
Remove the wires then take the top off the solenoid. Carefully pull the top off and remove the spring inside. Use a flashlight and look down into the hole... is there little bits of rubber/black stuff in there??? If so the solenoid is bagged or going.
You can put the top back on (without the spring etc), connect the wires (don't matter which one goes were) and you can run it like that. You will have to use the manual fuel shutoff lever to kill it until you get a new solenoid.

Give that a wack and see what developes....

Bob.

 

Not claiming to know everything, still learning a lot from these guys myself...... but before you spend more money, check and recheck your electrical connections. If someone else installed your pump, make sure they put the wires in the right place. Maybe I'm wrong on a CTD, but some components may still funtion partially with the wrong wire on a gasser. Right now I have to figure out what is popping the fuse to the dash/marker lights. I had to clean up the headlight connections, bought a starter before finding the wire was only &quot;sitting&quot; on the neutral safety switch, and went through a lot of fuses from the previous owner tinkering around. I also need to find a 1st gen to compare the underhood lamp and dome light connections that have been cut. Still love this old beater though.

 

hey Redleg same here about all the learning stuff from everyone on the site!!! well the pump has been on for allmost a year if not more and this all just happend about a few weeks ago now she just quit getting fuel somehow! and i have checked and recheck every frickin connections : im going to look at the fuel solenoid as BUSHY has said! and c if that is bad or not and if so replace it and go from there!! i still love this truck and its my work truck i really dont like drivin my 99 its a weekend truck only to nice!!! ;D

 

Found my &quot;loose wire &quot; last night. Nice not having to pull over every 5 minutes to change a fuse. By the way... stock up at NAPA, they were $.79.... buck or better everywhere else.<br><br>Hope ya figure it out Powerwagon.<br><br>Don