my 95 3500 hd 5 spd all stock has lost its power almost sounds like its got very little turbo at all i checked vac lines from pump to Wg sol. and to turbo and everything there is good no leaks and vac guage reads 20-25 i pulled codes up and there 94 95 96 at idle it put out quite a bit of smoke and smells like pure fuel driving down the road changing gears it smokes too but clears out once i get going good help!!!! its a tow truck so its making it kinda hard to pull woth no power what do i do ????

Clyinder imbalance codes.... maybe looking at head gasket failure (possibly) Check your coolant resivour for bubbles or if the radiator hose gets hard before engine is up to temp. Losing coolant? Could have injector issues too, but seems odd to have several clyinders go up on ya at one time.

could be a bad wastegate solinoid

Wastegate solenoid is going to usually throw a code 78 on an OBDI system. Smelling fuel and clyinder imbalance codes doesn't usually point to the turbo wastegate system. Are those the only three codes you have?

Check out the diagnostic checklist top to bottom to give her a good once over.

those are all the codes that come up ive cleared them and drove it and they came back again checked wg sol by unplugging and making sure all vac lines are good and clean no coolant loss never gets over 160-180 ill go pull the codes again after driving it all night las night and see what comes up if i get anything different ill post it up

ok update went out cleared codes again started truck (which starts right up ) let run a few mins and shut down pulled codes 93 94 95 96 97 and 12 which i know 12 is ok but what bout the others i guess maybe time for injectors??? i have to do something its gettin hard to pull a 3/4 ton truck with this diesel

Five clyinder imbalance codes? Check for fuel supply issues first. How's the fuel cap test on the diagnostic checklist? May have air getting in the line. Some have reported fuel line leaks in the mid 90's trucks lately. Combine that with a vacuum in the tank, and you've got issues.

My truck did this and it was my wastegate selenoid. But then in started doin it again a little while later.. and then i blocked my egr.. that solved it all

78 code is always for over-Boost - never for under-Boost, indication is black smoke, no power, fuel odor.

WG solenoid can cause over-Boost, as well as under-Boost, and failing vacuum pump can cause under-Boost.

Your sig should also indicate mileage - if hi-mileage, will require timing chain-set and injectors and probably Inj Pump.

IP and injectors will cause Cyl Imbalance codes at idle, as can extremely worn timing chain.

Bad fuel plays a really big hand, here, as does dirty air filtration

157,800 i went to portsmouth with it last night/ this morning its got a new ip basically everything on top of motor the only problem id the little t screw to let air out isnt there if you all need a pic of motor i can get one we bought this truck out of ohio and it had a bunch of new stuff on it im going to order 8 new injectors for it and start from there just in case ive changed filters. can i bleed air out through filter via screw on top?

Yes - that is it's function.

What color was the old fuel filter when you changed it?

1.Lift pump test (http://dieselplace.com/forum/showthread.php?t=39350)- pass
2.Service Engine Light - off
3.Model year 1994
3a. Odometer reading 158,000
3b. Miles on major engine components if been replaced less than 20K on new IP 8 new injectors
4.Do you have any engine codes? Yes
5.If you do have engine codes - 94 95 96
6.Air Filter condition (visual check) NEW
7.Fuel filter condition (freshly changed or condition unknown) NEW
8.Condition of Battery terminal connections (cleaned and tightened) yes 8A.Known condition and age of the batteries. 1000 crank amps X2 brand new yellow top
9.Upon cold start, does the radiator hose get hard quickly? no
10.Upon cold start, do you have excessive white smoke? Yes/no
11.Do you have excessive cranking time before the engine starts? NO
12.Have you used the block heater, and does this effect engine starting? NO
13.During hard acceleration, do you have excessive black smoke? no
14.Do you have any unusual exhaust smoke issues? smells like fuel
15.Turbo check out (http://dieselplace.com/forum/showthread.php?t=39368)- pass
16.Do you have an EGR (http://www.dieselplace.com/forum/autolink.php?id=42&script=showthread&forumid=21) on the engine? (An F or an S engine code) unknown
17.Indicate if you know if it’s a 3500HD.
18.Indicate fuel that you are using: # 2 Diesel
19.Are you using any fuel additives? If so, please list. No
20.Please indicate geographic region you are in: (example: Texas or Canada) Kentucky
21.Do you have any service history available that might pertain to the problem you are having?
22.Please indicate any modifications to the vehicle that might help us diagnose better. fast idle
23.Upon unscrewing the fuel cap (http://dieselplace.com/forum/showthread.php?t=42338), do you have a large vacuum formed in the tank? yes/no not any more new cap added


got all new injectors put in 4 were really bad looking wasnt spraying fuel like the others but i still have the fuel smell and smokes pretty bad not black like a grey/white collant is full and does not leak all vac lines are good im so lost no cat no muffler 4 in downpipe to a 3 in straight with echo tip out side of wrecker :help:

Yes - that is it's function.

What color was the old fuel filter when you changed it?

White/ grey not real dark looking kinda looked new but i put a new one in again tonight just in case it looked the same had just 1 little semi dark spot maybe 1/4 the size of a penny

20k miles no problems to date, and now having cylinder imbalance codes right? Just checking to make sure that this is a new issue and NOT since an IP change or PROM change. Your vintage calls for the HO Pump or 5068 pump, not the 5521 current production/rebuild pump.

Just making sure of all details....

20k miles no problems to date, and now having cylinder imbalance codes right? Just checking to make sure that this is a new issue and NOT since an IP change or PROM change. Your vintage calls for the HO Pump or 5068 pump, not the 5521 current production/rebuild pump.

Just making sure of all details....

correct new problem ive never had this problem and i dont want to take it to chevrolet garage here because rocks have more sense than the techs there

Cyl imbalance codes on three cylinders requires a compression check, first, then you might suspect 3-outta-8 failing injectors.

Cyl imbalance codes on three cylinders requires a compression check, first, then you might suspect 3-outta-8 failing injectors.

then its gotta be in the compression because it has all brand new injectors in it with a little less than 1000 miles on them

Let's start over - you cleard three Cyl Imbalance codes, right?

Scan again, see if the same three come up again - re-read your post if you don't remember which ones.

Next - 25" vac at pump at idle, with 15" at wg at idle, less when driving - what are your indicated readings?

correct cleared codes again with brake and gas depressed and batt cables off. pulled codes again...codes are 94 95 96 and 12 vac at pump 27-28 vac at WG bout 15-16 all readings are at idle

Ok, that's cyl's 4, 5, and 6 - #4 and #6 are behind the turbo shield, so let's work with #5, third back on the driver's side.

Remove #5 injector and swap it out with #1 - clear the codes, start the engine and see if #1 fails and #5 clears up.

And, you can do a compression check with #1 and #5 out - remove the connector from the ESO solenoid harness - 2 wires

ok update sorry it took so long been kinda busy lately took truck to chevrolet garage to be checked out they run tech 2 scan and adjusted timing on truck said it was at 21mm i think or something. run great drove 50 miles and lost all oil pressure turbo went out and threw sparks and pitch black smoke out exhaust along with raw oil so thanks to the
fu Censored dumbCensored at chevrolet garage i now have a blowed up non starting wrecker. thankx for all the help guys but i knew better than take to a dealer. but they are suppose to be they ppl to fix the problem needless to say they dont take any responsibility for the problem said it didnt have anything to do with there adjustments. sorry to rant on but i needed to vent.and the worst part is they said they would fix it for 7300 dollarsCensored Censored Censored Censored Censored