Confused 9702
Thread Starter
|
New User
Joined: Mar 2019
Posts: 9
Likes: 8
Confused 9702
Hello all,
new to forum have a problem I need help.1997 E-450 box van 6.8 V-10 motor took a dump.bought a 2002 wreaked E-450 motor home 34000 miles started engine purred like a kitten.pulled it and installed it in my box van change PCM and oxygen sensors motor starts but idles rough and backfires,checked all vacuum lines and connections everything seems fine.any help would be greatly appreciated.
new to forum have a problem I need help.1997 E-450 box van 6.8 V-10 motor took a dump.bought a 2002 wreaked E-450 motor home 34000 miles started engine purred like a kitten.pulled it and installed it in my box van change PCM and oxygen sensors motor starts but idles rough and backfires,checked all vacuum lines and connections everything seems fine.any help would be greatly appreciated.
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
In order for this swap to work properly you'd need to change just the long block. Considering you're using two different year parts there is most likely wiring issues---Ford is famous for changing wiring harnesses from one year to another.
Ideally you'd leave every part of the engine management system in the box truck transferring sensors etc to the replacement engine.
I do wonder if the 6.8's arrived with the PI heads installed like the 5.4's about '99 or 2000?
Ideally you'd leave every part of the engine management system in the box truck transferring sensors etc to the replacement engine.
I do wonder if the 6.8's arrived with the PI heads installed like the 5.4's about '99 or 2000?
Thread Starter
|
New User
Joined: Mar 2019
Posts: 9
Likes: 8
In order for this swap to work properly you'd need to change just the long block. Considering you're using two different year parts there is most likely wiring issues---Ford is famous for changing wiring harnesses from one year to another.
Ideally you'd leave every part of the engine management system in the box truck transferring sensors etc to the replacement engine.
I do wonder if the 6.8's arrived with the PI heads installed like the 5.4's about '99 or 2000?
Ideally you'd leave every part of the engine management system in the box truck transferring sensors etc to the replacement engine.
I do wonder if the 6.8's arrived with the PI heads installed like the 5.4's about '99 or 2000?
Senior User
Joined: Nov 2016
Posts: 173
Likes: 3
From: Klamath Falls, OR
Your description sounds like cylinders are firing in the wrong order.
Thread Starter
|
New User
Joined: Mar 2019
Posts: 9
Likes: 8
After reading jwa's post and yours I am thinking I need to change the engine harness from my original motor.really don't want to have to change body harnesses 🙁
Trending Topics
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Is the check engine light on? And even if it isn't have you scanned it for codes?
Double check things like the MAF part numbers. Do either one or the other have an EGR?
Double check things like the MAF part numbers. Do either one or the other have an EGR?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
You need the whole engine and intake, PCM, etc. from the 02.
02 is PI, 97 is not.
If that is what you did (original post is ambiguous about exactly how you did the swap) then you may just need an ignition tune-up or check to be sure the injector and coil plug connectors are clicked together and have good continuity on the wires.
Also check fuel pressure.
Also, I believe you may find that the transmission will have shift issues trying to use the old transmission with the newer PCM.
This is the cheapest way I know to scan PCM:
https://play.google.com/store/apps/d...g.prowl.torque
https://torque-bhp.com/wiki/Bluetooth_Adapters
02 is PI, 97 is not.
If that is what you did (original post is ambiguous about exactly how you did the swap) then you may just need an ignition tune-up or check to be sure the injector and coil plug connectors are clicked together and have good continuity on the wires.
Also check fuel pressure.
Also, I believe you may find that the transmission will have shift issues trying to use the old transmission with the newer PCM.
This is the cheapest way I know to scan PCM:
https://play.google.com/store/apps/d...g.prowl.torque
https://torque-bhp.com/wiki/Bluetooth_Adapters
Thread Starter
|
New User
Joined: Mar 2019
Posts: 9
Likes: 8
Thanks for the info.So I have checked all connections and vacuum lines and after reading earlier post I think that it is a wiring difference.was going to change the engine harness but the injector connections are different which leads me to believe that there is a wiring issue, I still have the motor home so I pulled the engine compartment harness am going to change that also,then all connections will be original and yes I used the 02 transmission as well
Elder User
Joined: Aug 2014
Posts: 560
Likes: 4
From: Anchorage, Alaska
Fuel issues and timing issues will also cause backfire problems as well as running rough. Krewat would be your best bet between the differences from 1997 to 2002. I know the heads are different, so I imagine the electrical components might differ, as well as the fuel and timing controlled by the PCM. Did you swap in the motorhome PCM?
Thread Starter
|
New User
Joined: Mar 2019
Posts: 9
Likes: 8
Update, no longer confessed.
thanks too all of you who responded to my post,after reading everyone's comments I came to the conclusion that I needed to change the engine compartment harness because there were different connections to the the fuel injectors then my original engine harness. Finished the swap today and motor purring like a kitten so hopefully this will help others doing this kind of swap.thams again for all your help.
thanks too all of you who responded to my post,after reading everyone's comments I came to the conclusion that I needed to change the engine compartment harness because there were different connections to the the fuel injectors then my original engine harness. Finished the swap today and motor purring like a kitten so hopefully this will help others doing this kind of swap.thams again for all your help.
Thread
Thread Starter
Forum
Replies
Last Post
TommyF150inMN
1987 - 1996 F150 & Larger F-Series Trucks
3
May 16, 2004 08:00 PM