help 7.3 2002
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Senior User
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Could it be tps related because I dont have check engine light on right now?
The throttle makes the the truck buck if you just feather it?
I was also reading somewhere that there some kind of trans sensor that tells the pcm what the position of the trans is in. Like I guess a speed sensor for the transmission.???? Thoughts?
The throttle makes the the truck buck if you just feather it?
I was also reading somewhere that there some kind of trans sensor that tells the pcm what the position of the trans is in. Like I guess a speed sensor for the transmission.???? Thoughts?
Hotshot
Joined: Dec 2006
Posts: 14,069
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From: Melbourne, Ky
I have an 02 and its doing nothing I have seen here on other threads. Here we go.
Just bought it. Previous owner took the chip off and did the seals on injectors. Good clean truck so got get issue fixed.
First start goes to high idle warm no problem. Starts great.
Warmed up pull out of driveway starts surging. Just in gear and out. Jumping from high idel to low.
Driving. If you drive it like grandpa no problems, but put to the floor and don't lift it spudders and misses. Never stalls or dies, but come to a stop goes back to weird idle again.
Change icp and ipr already, and have boost fooler on. Everything is normal, and scan guage2 is testing norm.
Any suggestions?
Please help
Just bought it. Previous owner took the chip off and did the seals on injectors. Good clean truck so got get issue fixed.
First start goes to high idle warm no problem. Starts great.
Warmed up pull out of driveway starts surging. Just in gear and out. Jumping from high idel to low.
Driving. If you drive it like grandpa no problems, but put to the floor and don't lift it spudders and misses. Never stalls or dies, but come to a stop goes back to weird idle again.
Change icp and ipr already, and have boost fooler on. Everything is normal, and scan guage2 is testing norm.
Any suggestions?
Please help
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He said just did the o-ring and ran the stock. Cant be sure if he said rebuild or not. But didnt put in like AA or different than from stock for the truck
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
OK. Then I'd be looking at the Under Valve Cover Harness (UVCH). If you're getting 3000ICP, then the o-rings are doing their job in my opinion. Something else to consider, if you just changed the IPR, and fuel pump, you likely have air in both the fuel and HPOP systems, and may take 100 miles or so of driving to get that cleared out.
Did you drop the fuel tank and check the mixing chambers and fuel pickup tube?
Did you drop the fuel tank and check the mixing chambers and fuel pickup tube?
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Inside the fuel filter housing near the top is the fuel return line. You can either remove the line and clean it, or do as I do and when I change the filter, I drain the housing and spray out the opening from inside the filter housing with a can of WD40, straw attached, leaving the drain valve open. I also use that can to clean out the housing too. Then, I fill it up with tranny fluid about an inch and a half from the top and replace with a new filter.
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
https://swampsdiesel.com/products/fu...re-pump-kit-2/
Granted, you can make your own and save some money. Just be sure you have a filter in the line before the pump.
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Ok biggg problems!!!
First did the fuel pick up mods and took it out on a test drive pulled good.
Was still idling weird but I was guessing air in the fuel system.
Anyways was on my way home, and stopped at store to get food. Big mistake!!!
Leave the store super under power. Lugging like crazy!
Omg please lets just get home!
Nope started driving futher, started to run rougher, could start to here the injectors clank because of no power or fuel or god knows what. Until we died.
Cracked and cracked fired move a couple feet died. Crank crank moved and died. Then tow truck
I feel now im leaving towards pcm and idm because it won't even soon the starter let alone run
First did the fuel pick up mods and took it out on a test drive pulled good.
Was still idling weird but I was guessing air in the fuel system.
Anyways was on my way home, and stopped at store to get food. Big mistake!!!
Leave the store super under power. Lugging like crazy!
Omg please lets just get home!
Nope started driving futher, started to run rougher, could start to here the injectors clank because of no power or fuel or god knows what. Until we died.
Cracked and cracked fired move a couple feet died. Crank crank moved and died. Then tow truck
I feel now im leaving towards pcm and idm because it won't even soon the starter let alone run
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Update. Burn starter trying to start the other night that's why no crank. Change it test drive ok. On way home it started the same thing acted like it was running out of fuel. My lift pump its screaming while running, its brand new but I think it cuts out even it gets warm
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Update. Burn starter trying to start the other night that's why no crank. Change it test drive ok. On way home it started the same thing acted like it was running out of fuel. My lift pump its screaming while running, its brand new but I think it cuts out even it gets warm
As I eluded to in Post #2. You're going to have to get some information to determine what system needs attention. Did you check the Fuel Pressure? Regardless of a new pump, the system can be low pressure for several reasons. You need to know this prior to continuing.
Troubleshooting begins with eliminating systems and parts. My bet is on electrical. But, can't rule anything out without the data.
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You're going to need a Bi-directional Scantool (OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit)
As I eluded to in Post #2. You're going to have to get some information to determine what system needs attention. Did you check the Fuel Pressure? Regardless of a new pump, the system can be low pressure for several reasons. You need to know this prior to continuing.
Troubleshooting begins with eliminating systems and parts. My bet is on electrical. But, can't rule anything out without the data.
As I eluded to in Post #2. You're going to have to get some information to determine what system needs attention. Did you check the Fuel Pressure? Regardless of a new pump, the system can be low pressure for several reasons. You need to know this prior to continuing.
Troubleshooting begins with eliminating systems and parts. My bet is on electrical. But, can't rule anything out without the data.
Did tank mods. but will messure pressure and vacums to make sure
Thanks cheers
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Finally got a fuel pressure gauge on the truck ling story, and now started working nights. Anyways got a new pump on and ran about 50 psi. Drive around the block taking it easy and dropped to 20. Decided to look at fpr and add a shim see if it can get up some. Got 80 psi! A little hight but tried a test drive only dropped to 40-50 full throttle. Ok ill try it little longer.
Went on a 10 to 15 min just got her up to op temp and pulled out on main drag and stood on it went straight to 0 psi!!! Barley made it home.
During my test run a hooked up a metter to fuel pup to monitor voltage and it varied from 12.01 to 13.04 v depending on load. Curious what could be left. All fuel fittings are dry and don't see any leaks at all.
Any body got any suggestions
Went on a 10 to 15 min just got her up to op temp and pulled out on main drag and stood on it went straight to 0 psi!!! Barley made it home.
During my test run a hooked up a metter to fuel pup to monitor voltage and it varied from 12.01 to 13.04 v depending on load. Curious what could be left. All fuel fittings are dry and don't see any leaks at all.
Any body got any suggestions
Fleet Mechanic
Joined: Mar 2009
Posts: 1,856
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From: Sacramento Delta, CA
Dude, drop your tank. You have rust or other debris in the fuel pickup. Blocked fuel pick up means low pressure regardless of the strength of the pump, the electrical connection, or how tight the connections are.
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Did the tank already. Has straight tubbing into a clean tank