6v92 low on power

gear jammer · September 09, 2021, 08:34:32 PM

Yeah I know the feeling. I've had a 4104. A flx vl100 fully restored. And I still have my 1960 starliner. But this concept I had to have. Beautiful workmanship. Go it to get a t back to full speed though.

gear jammer · September 09, 2021, 08:53:57 PM

Ok I pulled codes using the ddec switch and using the cel.
22
43
44
46
58
Keep in mind I've never seen a cel since I've owned it
Do I have to pull the pulley to check timing sensor?

luvrbus · September 09, 2021, 09:05:20 PM

Quote from: gear jammer on September 09, 2021, 08:53:57 PM
Ok I pulled codes using the ddec switch and using the cel.
22
43
44
46
58
Keep in mind I've never seen a cel since I've owned it
Do I have to pull the pulley to check timing sensor?

You seem to have a low voltage problem do you know how to count TPS

gear jammer · September 09, 2021, 09:20:45 PM

No

TomC · September 10, 2021, 07:56:18 AM

Still like my mechanical injection. Good Luck, TomC

chessie4905 · September 10, 2021, 08:10:13 AM

don't panic! usually that many codes indicate a bad connection, many times a ground connection that feeds several sensors. Other times one bad sensor can trigger alarm or codes from other sensors that depend on signal from that particular sensor. I would start with checking computer ground con ections, and or broken one. Age and corrosion can cause typical issues, especially from poor wire repairs in the past.

gear jammer · September 10, 2021, 08:23:56 AM

Looking at the ddec troubleshooting manual. Those are historical codes. The cel light doesn't go out until the problem are repaired. But the codes stay here n the computer until cleared. You need a pro link to clear codes. I may be wrong but I don't think the codes are relevant
I agree on the mechanical injection

gear jammer · October 14, 2021, 02:31:15 PM

Howdy
Still have not solved the low-power problem. Hers what I have done
Ran it with no air cleaner, took the terribly restricted muffler off. Changed the boost sensor. Put a gauge on fuel pressure 40 idle. 60@1000 rpm,75 @no load. All which have accomplished nothing. Still smokes black when you gun it. And low power. I ran it with the boost sensor hose off. Still same, smoke no power. Disconnected the plug at the sensor. Runs the same with the Cel on. Starts good, runs smooth. I'm ready to pull my hair out. Turbo turns good no slop in bearings. If you put in gear to move forward it's a turtle and stream of constant black smoke. Until it gets to speed. Takes forever.
Any more ideas. Scan gauge says it's getting 100 percent on the tps,
Steve

luvrbus · October 14, 2021, 03:07:28 PM

Quote from: gear jammer on October 14, 2021, 02:31:15 PM
Howdy
Still have not solved the low-power problem. Hers what I have done
Ran it with no air cleaner, took the terribly restricted muffler off. Changed the boost sensor. Put a gauge on fuel pressure 40 idle. 60@1000 rpm,75 @no load. All which have accomplished nothing. Still smokes black when you gun it. And low power. I ran it with the boost sensor hose off. Still same, smoke no power. Disconnected the plug at the sensor. Runs the same with the Cel on. Starts good, runs smooth. I'm ready to pull my hair out. Turbo turns good no slop in bearings. If you put in gear to move forward it's a turtle and stream of constant black smoke. Until it gets to speed. Takes forever.
Any more ideas. Scan gauge says it's getting 100 percent on the tps,
Steve

Have you done the injector cut out and see if the smoke goes away and have you checked the pulse width on all the injectors ?.If you have the heat blankets on the manifold and piping I would remove it a check the piping,gaskets and manifold mine blew a chunk out of 1 manifold and I could never find it till I removed the blankets and it fell out

buswarrior · October 14, 2021, 04:01:23 PM

I'm just a bus driver...

If it was me...

The boost is being made, and it is being pumped over board.

Find where the boost is leaking.

White shirt and tie carefully hung on the rear view mirror, and into the engine compartment to find the broken clamp, burst hose, cracked manifold, cracked pipe, loose bolt holding it on top, airbox inspection cover come loose...

Restroom wet wipes, be sure to check backs of arms, shirt and tie back on, hero to the customer...

Happy coaching!
Buswarrior

luvrbus · October 14, 2021, 04:16:45 PM

I think he lost a injector or got a load of real crappy fuel,a pro/link will only tell you what's happening on the top of a injector

chessie4905 · October 14, 2021, 04:18:31 PM

you sure the turbo isn't missing some or damaged vanes? You have a boost gauge?

luvrbus · October 14, 2021, 04:37:31 PM

The DDEC is supposed to supply just enough fuel (AR) for the air it produces DDEC' usually don't blow a lot of black smoke unless something is wrong under the valve covers . The turbo sensor tells the ECM how much fuel is needed

gear jammer · October 14, 2021, 06:15:00 PM

no i havent removed the blankets, no broken clamps, yes i have a boost gauge, not guessing, ill have the prolink cable soon so i can check injectors etc, maybe the fuel this started after a fuel up but i didnt notice it til 200 miles after, i was on the highway for a couple hundred miles, noticed it in traffic, these things move slow off the line anyway, now its real bad.

Fred Mc · October 14, 2021, 06:48:21 PM

Just watched as video when the bus was down on power because there was an exhaust leak between the turbo and blower.