Van runs great, gobs of power even with 12Klbs gross loading, but, after a hot run, when idling, its sort of rough with black smoke belching out the pipe - very fuel smelling, mileage is lower than anyone said they get - I get 7-8 mpg whereas everyone else gets 9-10. At $3.50 a gallon this adds up.

Plus new, wires fine, cap rotor etc ok, no MIL, O2S new.

Im thinking, because of the heat soak, and this occurs after a climb or long summer drive...I have a lazy injector that is staying open. 24lb stock injectors, i have little interest in yanking them and flow testing them simply because I dont think I can heat them up....so....sound reasonable that its a lazy injector? I can get 8 remans for $200...almost kind of worth it blind, just wanted to bounce the idea off the board...

ps: I fat fingered the title. I do not have a new weird van model

 

Happens to the best of us!

Will suggest visiting the various diesel forums here---tons of accumulated and practical knowledge to be found for sure. The very very next-to-nothing I know about diesels I'd say your thought about a lazy injector seems most logical. the fuel smell and black smoke being big clues.

 

SeaFoam would clean that injector right up from sticking, plus it would clean off the intake valves.

I'd also change the fuel filter, and crack open the pre-filter assembly to see if that is plugged up. Yep, it's the black plastic thing that says "do not open"......open it, you'd be amazed what gets trapped in there!

 

Well I got 8 working 24lb denso injectors from a 95 cobra, installed, have not driven it to heat it up, but at idle its still rich.

It alsmost has to be the O2S, even tho I replaced it 2 years and 3K ago...i have no single plug showing foul and really all 8 are ok color wise, it just smells rich in a way that nothing else I have owned in decades does.

the extra gas in my exhaust gets it glowin red hot...

 

Ok, 2 trips since then. It was not the injectors. hence now I have 8 perfectly fine used 24lb injectors to sell at carlisle...

It will run all day, the hills of PA, luggin its 12Klbs carcass and towing, usually around 3500lbs towed weight.

but it will not idle smooth once hot. give it gas and once it gets off idle it runs like a dream again with plenty of power...

hot in park, goose the throttle and shoot perfect plack jets of unburnt fuel.

what am I missing? no MIL at all! ISC need cleaned?

I was thinking TFI, but when they get hot, if they dont fail fully they dont run at speed, only idle. bad coil?

I dont wanna throw money and parts at it, but I sorta have no choice.

and as soon as I cool it down, it fires up and idles great but she no longer has a fast idle at first...common sense tells me the ISC is sticking there...what say ye?

 

well the idle air control aka ISC-BPA aka that wierd solenoid thingy on the throttle body was not contributing.

unplug it - no change in idle.

pick one up from auto zone (I hated to do that vs rock auto and NOT A SINGLE PERSON IN THE AUTOZONE KNOWS A DANG THING ABOUT PARTS), installed, touched key, voila - fast idle, slows down, hit the ac, idle drops then picks up...

It omay have not been all of the problem, but it was a problem and its fixed, I also changed the ECT as well - perhaps it was not signalling a hot engine

so now to drive the next trip. The only other culprits I can envision using EECIV 101 reasoning is the EGR solenoid stuck on, and/or the EGR valve sticking on.

Im ruling out the coil pack because a bad coil when hot will idle, but wont run at speed well. Im seeing the exact opposite.

Now to replace the brushes in the genset

 

What we know:

wasnt the injectors,
wasnt the EGR,
wasnt ECT,
wasnt EGR sol...
wasnt the cap/rotor...

im left with replacing the wires that LOOK good, plugs that have <6000 miles and another O2S.

But at least she threw a code yesterday on the way back from Carlisle so I gotta hook up my gizmo

 

I would guess map sensor first and then maybe the air temp sensor or the fuel pressure regulator.
What code did you get?

 

Dunno yet, I have not had the time to crawl into it. (work just does not give me time off when my trucks are broken!)

I do know, whatever it is, its heat related. As soon as she warms up, it does this. The new IAC keeps it from stalling so thats a plus.

BTW - your 94 class A has essentially the same powertrain - you ever hit this?

 

No I have not.
My F53 has a different computer and will very seldom go into closed loop.
Your E350 will go into closed loop as soon as it gets warm.

 

Getting somewhere....the scan tool showed a 332? insufficient EGR - tested the new $90 egr valve, its ok and the EVP is ok, put back the old solenoid and it works.

took out the raytek and found that #7 is 40-50 degrees cooler....pulled the plug wire - nuttin. the plug is firing, I think the injector aint...i just got this set to replace the others i thought had one stuck and turns out I didnt, so I will swap out one of the injectors tomorrow. and the wires, and boot guards and put ap25 plugs back in (the 25s in there are perfect, they fit the other truck, i can keep em.

But Subford may have won a beer...i ran the dcl data stream and the map was saying I had 10.2" at idle, but 2 handheld gauges said I had well over 15 inches. a low reading map will trigger a wider injector bandwidth and ....waste fuel.

and who makes header gaskets that hold in there for a 460? the cheap SOBs are already fairly thin on #8...

 

What brand headers?

I'd think there are tons of great header gaskets especially for the 460---its been around long enough!