E99 Bucking and No Power
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Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
E99 Bucking and No Power
well I've been fighting this truck for a few weeks now. it started with dying when rolling to a stop on occasion. the problem got worse and worse, even had to be towed home a few times. so far I've replaced the IPR, ICP, lpop, uvch's, and all 8 injectors because I kept getting low ipr codes. a few days ago it threw some new codes pertaining to the pcm so I bought a new one and after 3 days at the stealership to get flashed I get it back and it's still running like crap. bucking pretty bad and no power while accelerating. the codes I'm getting now are p0231 (fuel pump circuit fault), and p0603 (PCM KAM fault). the 603 code was one I was getting b4, but the 231 is new. any ideas on those and what to do? also I decided to check my engine temp on the AE and a 10 min. trip had me hitting 280(not good) and the gauge in the dash never moved from normal. hoping that's just thermostat, cause I was told the water pump was new when I bought the truck.(looks new) I could really use some help on this cause I'm loosing my mind. I've thrown a few grand at this, I've looked the wiring over half dozen time and I can't find any problems but this thing runs horrible.
Logistics Pro
Joined: Aug 2009
Posts: 3,609
Likes: 324
From: Arizona
WOW you've spent some serious cash in this! Unfortunately throwing parts at these gets expensive really fast, there is a good chance you didn't need injectors or a pcm, or a lpop. Most of the time the DTC's are a symptom, not a cause as you are probably finding out. Fuel pressure is a common issue on these trucks especially as they age, and given the flawed fuel pickup/mixing system Ford put in the tank. (Google the "Hutch" mod) FP is where I'd be looking first, if that is not up to snuff nothing else will be either. If the engine is not getting what it needs it can't build RPM, ICP or boost thus the codes will start popping up. FP needs to be verified under load, not just idling and revving it up.
By the way you can't see coolant temp on the automatic trucks with a scanner, there is no data sent except on the manual trucks.
By the way you can't see coolant temp on the automatic trucks with a scanner, there is no data sent except on the manual trucks.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
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Thread Starter
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
WOW you've spent some serious cash in this! Unfortunately throwing parts at these gets expensive really fast, there is a good chance you didn't need injectors or a pcm, or a lpop. Most of the time the DTC's are a symptom, not a cause as you are probably finding out. Fuel pressure is a common issue on these trucks especially as they age, and given the flawed fuel pickup/mixing system Ford put in the tank. (Google the "Hutch" mod) FP is where I'd be looking first, if that is not up to snuff nothing else will be either. If the engine is not getting what it needs it can't build RPM, ICP or boost thus the codes will start popping up. FP needs to be verified under load, not just idling and revving it up.
By the way you can't see coolant temp on the automatic trucks with a scanner, there is no data sent except on the manual trucks.
By the way you can't see coolant temp on the automatic trucks with a scanner, there is no data sent except on the manual trucks.
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Cargo Master
Joined: Aug 2009
Posts: 2,137
Likes: 13
From: Glendive, MT
He's saying the PCM is living to your AE. The coolant temp sensor is connected to the gauge only. There is no coolant temp sensor sending information to the PCM. The PCM reads engine oil temperature.
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Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
so if my gauge in the cluster is showing low side of normal then I'm good. awesome one less issue to have to mess with. on to the fuel pump, I pulled the cap this morning and drained the bowl. it took about 5 seconds to fill back up, seemed kind of slow but how should I know. whats normal? going to parts store to get hardware to check the fuel psi. i'll let ya'll know what I find out.
Logistics Pro
Joined: Aug 2009
Posts: 3,609
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From: Arizona
so if my gauge in the cluster is showing low side of normal then I'm good. awesome one less issue to have to mess with. on to the fuel pump, I pulled the cap this morning and drained the bowl. it took about 5 seconds to fill back up, seemed kind of slow but how should I know. whats normal? going to parts store to get hardware to check the fuel psi. i'll let ya'll know what I find out.
Pressure Port Adapter - 90 deg elbow x 1/8 FNPT for Ford 7.3L (99-03) - GZ-13-002
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Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
it took 3 hours to source the parts for a fuel psi test. got back to hook everything up and my batteries were dead. finally got it to fire up then lost my fuel psi. I chased it all the way to a bad ground on the relay, rigged a jumper and got the pump working again. it's kind of getto, but good enough for a test drive. the truck ran a lot better but still hiccupped a couple times, and it died twice in the driveway when I got back home. it held 60 psi of fuel pressure the whole time. so the FP issue is most likely solved. anyone know where the relay gets it's ground cause I'd like to fix it right, also might be causing some of my other issues. also why does it keep dying? I'm out of ideas.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
the fuel issues ended up being the new PCM. the fuel relay wasn't getting a ground from the PCM so the fuel pump wouldn't kick on. I swapped the old one back in and it worked. that problem solved but the truck still dies while coasting to a stop. I had to be towed home again this morning. I can not figure out why. everything in the hpo system is new except the pump. and according to the internet those never go out. if they do it just quits, not this intermittent BS. when it dies it struggles to make hpo, but the IPR duty cycle is 65%
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