99 -7.3 sounds/lopes like a HEMI w/Cam - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 06-08-2010, 11:43 AM Thread Starter
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Unhappy 99 -7.3 sounds/lopes like a HEMI w/Cam

My 99 - 7.3- 207K threw me a new curve last month. It began running irratically, killing without warning and upon restart, the engine lopes like a Funny Car with a Hemi and serious cam in it. When I bury the fuel pedal to get it going it throws out a big cloud of black smoke. The service engine light comes on if it feels like it. When the engine has decided it's had enough of acting ignorant, it begins running perfectly. Then, it's been just a matter of time for the "Dragster" to come out and play again! One "Mechanic" and one Parts Supplier could not get any codes out of their instruments from my truck. I've changed the air and fuel filters and the Cam Position Sensor.

Any suggestions would be appreciated,
Sucking Sawdust in New Orleans,
Lou the Carpenter

Pray for us with this Oil Mess!
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post #2 of 10 (permalink) Old 06-08-2010, 05:47 PM
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Have you checked the UVC wiring and IDM? Of course I would expect a code if either of these was acting up.

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post #3 of 10 (permalink) Old 06-08-2010, 06:42 PM Thread Starter
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Sounds Greek to me, but I'll look into it. It's kinda like I never really know much about BP before the disaster, but I DO NOW!

Thanks,
Lou
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post #4 of 10 (permalink) Old 06-08-2010, 07:46 PM
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How have you tried to pull codes? Using what scanner? UVC is under valve cover wiring to the injectors. It has been known to cause an intermittent miss.

1996 Int 4700, 175hp DT466, 5 speed, 2x rear end, service body

2001 F350 SRW flatbed, 4x4, crew cab

1978 International F2275 Dump Truck

1996 NH LX665, steel tracks on foam filled tires

2005 Tackeuchi TB145

2003 Takeuchi TL150

Case 850B Highlight, 4 way bucket
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post #5 of 10 (permalink) Old 06-09-2010, 03:07 AM Thread Starter
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Have a new mechanic going to check for codes tommorrow. I'll ask him what equipment he's using.

Thanks,
Lou
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post #6 of 10 (permalink) Old 06-09-2010, 10:24 PM Thread Starter
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New Mechanic pulled nine codes with his MODIS hand help diagnostic unit. Seven cleared by a 1280 and a 470 reappeared. Additionally the check engine light comes on when it is running perfect but not when it bucks, spits and kills. The mechanic thought it strange and felt it may all be connected. Looking for a diesel Mechanic in the (Not yet covered in BP Oil) New Orleans area.

Thanks in advance,
Sucking Sawdust down South,
Lou the Carpenter
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post #7 of 10 (permalink) Old 06-10-2010, 06:13 AM
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It's your Exhaust Back Pressure sensor, and check the voltaged to your ICP sensor, the 1280 is telling you it's low. the EBP sensor is a common issue that's alot of people bypass.

there's a bypass mod for it.

Your mechanic shouldn't have cleared your code's this could be your IDM needing replacement. did he check the voltage to it?

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post #8 of 10 (permalink) Old 06-12-2010, 11:01 AM Thread Starter
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Going to see the new mechanic today. The fella that pulled the codes only has a small shop/station and his bays aren't big enough for "Big" trucks, so he really doesn't work on diesels. Thanks for all ya'lls help and I'll definitely relay your info today!
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post #9 of 10 (permalink) Old 06-14-2010, 04:02 AM Thread Starter
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No more HEMI/CAM lope!

Thanks to all the diagnostic help! My mechanic unplugged the ICP sensor yesterday am and the truck ran fine. In the afternoon I changed out the ICP sensor (1280 code) and the Exhaust Backpressure Sensor (Fault 470 code). Running great!

GOT TO GO FISHIN TODAY, LAKES BORGNE, CATHERINE AND PONTCHARTRAIN VIA THE CHEF MENTEUR PASS. WATER WAS AWESOME (NO BPBS), BUDLITE WAS COOL AND OH YEAH, WE CAUGHT PLENTY OF REDFISH, SPECKLED TROUT, CROAKER AND SHEEPSHEAD. GREAT DAY ON THE WATER!

LET ME KNOW IF ANYONE NEEDS HELP WITH A SOUTH LOUISIANA FISHIN TRIP!

Thanks for all the help,

Lou
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post #10 of 10 (permalink) Old 06-14-2010, 04:23 AM
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Quote:
Originally Posted by lbarattini View Post
Thanks to all the diagnostic help! My mechanic unplugged the ICP sensor yesterday am and the truck ran fine. In the afternoon I changed out the ICP sensor (1280 code) and the Exhaust Backpressure Sensor (Fault 470 code). Running great!

GOT TO GO FISHIN TODAY, LAKES BORGNE, CATHERINE AND PONTCHARTRAIN VIA THE CHEF MENTEUR PASS. WATER WAS AWESOME (NO BPBS), BUDLITE WAS COOL AND OH YEAH, WE CAUGHT PLENTY OF REDFISH, SPECKLED TROUT, CROAKER AND SHEEPSHEAD. GREAT DAY ON THE WATER!

LET ME KNOW IF ANYONE NEEDS HELP WITH A SOUTH LOUISIANA FISHIN TRIP!

Thanks for all the help,

Lou
glad to be a help

Real Trucks Burn Diesel!
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