Bought my truck back in May. Was hard to start and always smelled like I took a diesel bath after driving it. I have replaced GP, repair GP harness, Install new GP controller, new injectors, and return lines. Truck starts great! sounds good at idle and I don't smell like diesel as much (think the fabric in the seats holds in the diesel smell since my wife only smells it on the back of my shirt).

Here is my current issue, After installing the new parts it feels like the truck lost some of its edge. Before it seems like the truck always wanted to try to spin the rear tires.(run like a cheetah) Since the new parts it calmed the truck down (runs like 3 legged dog) Doesn't feel as much torque is there like before.
I did some reading on here and found that the tach sensor could be causing some of my issues since it's not working correctly. SO I bought a new one and put it in Truck idles at 700-800 (just glanced at it) It seems to shift better but so far I only driven it 7 miles if that. Tomorrow I'll be going a little further. I have also noticed my MPG is not as well since the new parts on.

I was told by my fleet mechanic that I didn't need to change the IP it should be fine. (I own a small plumbing business and just pay the mechanic to work on my vans. Tax write off plus vans are a PITA to work on and I'm no mechanic)

Tach sensor has never worked correctly on the truck since I've owned it.

I will be driving this every morning to take kids to school. Trying to get best performance out of it.

Thank you
Michael

 

Not sure if this is important to know. At start up it puffs a little smoke gray color which I believe is normal.

As I get on it to pass someone it lets out black smoke which is normal. But it doesn't roll out black smoke more like a smoker opening his mouth and letting the smoke come out on it's own (puff) If I punch it from a dead stop no smoke it seem to only do it after it locks in?

My exhaust is bent to a oval shape at the exit of the tail pipe (looks like rear tire blew and damaged it before I bought it)

Thanks
Michael.

 

New injectors on an older pump will create more work for it, and will change timing with the higher pop pressure at the injectors, which will mess with the power you're used to.

Were the injectors actual New units, or rebuilt?

 

I bought new Delphi's

I'm funny about Re manufacture items. But I know with these old Trucks it's going to happen at some point in time but New parts until that happens

Mechanical background is not in my favor on this. How hard is it to set the timing? Is this something I could possibly do?

 

New ones arent necessarily better, nor even good, depending on who puts em together. Odds are theyre pretty decent. But you really should change IP with injectors. Usually fresh injectors are enough to put an old pump in the graveyard. Also old pumps have higher tolerances, so more pumping loss, couple that with tighter injectors only makes the problem worse. The same could also make a bit on the retarded side.

 

what year is the truck,is it n/a or turbocharged and what trans does it have?

in warm weather you shouldn't be seeing it puffing much for gray/white smoke at start up.you'd have to see the little puff by watching the tailpipe from the rear to see the split seconds worth.much more than that at these temps,then the injectors may be bad out of box.

when passing someone and seeing black smoke.though you called that normal,it's not.

the tach sensor will only effect idi trucks equipped with the E40D transmissions.the engine doesn't care or know if it has a working tach or not and doesn't effect it's state of tune.

the fact you've got some white smoke at start up in these temps (noticeable enough to bother posting about) and that you've got less power than before you started,suggest improper engine timing or the injectors you bought are no good.though having the timing set is important,im suspecting bad out of box injectors.send them in for a refund and try a set of stanadyne's.
the black smoke under load,suggests someone turned the fuel up too high.if your not running an egt gauge,it's vital you turn the fuel down or engine damage will occur.

 

This identical question was asked at Oil Burners as well and the replies are the same. What's the reason for posting the same question at both sites? Especially since both sites have the same members for the most part.

I could see asking at one and if not getting the requested information then trying the other, but both at the same time is an exercise in redundancy.

Not picking on the OP though, I see this happen a lot and figured I'd comment on it here.

 

Well to answer your question Sir! I ran across the other site a while back ago. In my defense I don't know who's on what site. I figure to ask on both sites. Didn't mean to upset you!

 

It's a 91 F350 4x4 CC non turbo. It has the E40D I notice on the dash the OD button flashing when I'm slowing down to a stop. I searched on here why it was doing that, which lead to Tach Sensor. I just didn't know where it was located until I asked. Since the TS was installed the ruck shifts so much smoother. It's like night and day on shifting.

Most diesel trucks in my area have a Black rolling cloud of smoke (Blacking out view until smoke clears) I know it's due to fuel being turned up from reading on here. Or programmer since they are newer trucks. I guess I should invest in some gauges. Give me a list of gauges that are important to have.

 

Not upset, like I said I wasn't picking on you, a lot do it, was just wondering the purpose. Kinda reminds me of cross-posting back in the Usenet days.

A Pyrometer/EGT Gauge is a must if you're going to mess with timing and/or turning the fuel up.

Then the basics, coolant temp, oil pressure, and volts. Then you know just where you're at. In your generation truck they used a dummy gauge which means it worthless other than to tell you if you have oil pressure or not.