351w swap help
Thread Starter
|
New User
Joined: Oct 2012
Posts: 5
Likes: 0
351w swap help
Hello all. Thanks for taking the time to read about my project and some problems I am having. Let me first give you a rundown of what I have done so far. I have a 1990 f-150 with a 302 originally. I have already swapped a 351w crate engine (all made to 1990 specs) with edelbrock heads, Edelbrock intake, MSD Distributor, Dunn RIght mass air conversion kit for 351, new throttle body and 30lb injectors. I can get it running good spraying gum cutter in the intake but noticed it popping thru the intake when I let off the gum cutter. the Timing is super close and the firing order is correct for the 351w. During the swap the only sensor that did not swap was the Cam sensor. I pulled the plugs and added noid lights to the injectors and found the injectors aren't firing when they are supposed to. Since the 351 doesn't come with a cam sensor how am I suposed to get the computer to know when to fire the injectors??
I have looked to see if someone has had the same issue as me with no luck. I hope someone here can help me out.
I have looked to see if someone has had the same issue as me with no luck. I hope someone here can help me out.
Thread Starter
|
New User
Joined: Oct 2012
Posts: 5
Likes: 0
I know its a crane Cam for a 1990 351w. It came as a long block crate engine. The computer is for a 5.0HO (same firing order as 351) that came with the mass air conversion kit from dunn rite. I have even bought 2 harness's and 3 computers.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
Umm
It's got a distributor. There is no cam sensor. The whole operation is in the distributor and tfi module.
Are you using a mass air conversion kit for the mustang ecu or for the truck ecu.
Your truck harness and mustang ecu have drastically different pin locations. And require 6 more wires to be added just for the injectors, 4 for maf and relocate about 10 other wires.
It's got a distributor. There is no cam sensor. The whole operation is in the distributor and tfi module.
Are you using a mass air conversion kit for the mustang ecu or for the truck ecu.
Your truck harness and mustang ecu have drastically different pin locations. And require 6 more wires to be added just for the injectors, 4 for maf and relocate about 10 other wires.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Is the distributor also for a '90 motor with a grey TFI module on the side?
Do you have a MAF meter scaled for 30lb injectors?
There is no cam sensor on a 302 or 351 so I'm not sure what you're talking about there.
Does the DunnRite kit replace the whole engine harness or is it just an overlay for MAF and injectors?
Do you have a MAF meter scaled for 30lb injectors?
There is no cam sensor on a 302 or 351 so I'm not sure what you're talking about there.
Does the DunnRite kit replace the whole engine harness or is it just an overlay for MAF and injectors?
Thread Starter
|
New User
Joined: Oct 2012
Posts: 5
Likes: 0
The 302 did have a rear cam sensor. The dunn right convert kit was made for the truck with the 30 lb injectors. Their system overlays the existing harness and has the new needed wires for the injectors, mass air meter and is suposed to cancel out the wires not needed. How does the computer know the position of the engine? Do I still need to repin the existing harness?
Tuned
Joined: Feb 2009
Posts: 326
Likes: 15
From: near charlotte nc
neithor the 302 or 351 had a cam sensor the comp uses a signal from the dist to fire the injectors
Trending Topics
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
The only 302/351 with a "cam sensor" is the explorer with the dual coil packs.
And it really isn't even the cam sensor that says where the engine is. It's the crank trigger using a missing tooth to tell the EEC5 where it is.
The truck uses the distributor and pickup inside it to tell the computer where it is.
The only sensor in the rear of a 302 was a knock sensor.
And it really isn't even the cam sensor that says where the engine is. It's the crank trigger using a missing tooth to tell the EEC5 where it is.
The truck uses the distributor and pickup inside it to tell the computer where it is.
The only sensor in the rear of a 302 was a knock sensor.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Are you 100% positive your DunnRite kit for a 5.8... mistakes happen.
Are you 100% positive the plugs are wired correctly for the HO/5.8 firing order? Popping through the intake suggests one of these is wrong.
Are you 100% positive the plugs are wired correctly for the HO/5.8 firing order? Popping through the intake suggests one of these is wrong.
Thread Starter
|
New User
Joined: Oct 2012
Posts: 5
Likes: 0
I am positive the dunn right is the correct one, in fact I have talked to them for hours and they sent me a whole new kit. I also know the the firing order is correct for the 5.8. Do you think that the MSD dis isnt sending a signal to the computer?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The distributor could be the problem have you tried a Ford distributor? In either case it should have a grey TFI module on the side.
You say the injectors are firing though right just not in the correct order, and if so that means the computer is getting a signal from the distributor, so then it comes down to the wiring harness sending it to the right injector. Do you have an extra Dunrite harness right now? If so you can verify the injector wiring with a multimeter and this is what you should see when buzzing from the EEC connector to the injector connectors.
Inj #1 - Pin 58
Inj #2 - Pin 59
Inj #3 - Pin 12
Inj #4 - Pin 13
Inj #5 - Pin 14
Inj #6 - Pin 15
Inj #7 - Pin 42
Inj #8 - Pin 52
You say the injectors are firing though right just not in the correct order, and if so that means the computer is getting a signal from the distributor, so then it comes down to the wiring harness sending it to the right injector. Do you have an extra Dunrite harness right now? If so you can verify the injector wiring with a multimeter and this is what you should see when buzzing from the EEC connector to the injector connectors.
Inj #1 - Pin 58
Inj #2 - Pin 59
Inj #3 - Pin 12
Inj #4 - Pin 13
Inj #5 - Pin 14
Inj #6 - Pin 15
Inj #7 - Pin 42
Inj #8 - Pin 52
Thread
Thread Starter
Forum
Replies
Last Post
smurray
Computer Chips & Tuners
11
Oct 31, 2009 11:52 AM
Tex351
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
8
Nov 22, 2004 05:19 AM
concreteman
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
Jun 24, 2002 08:39 PM
Gates
1987 - 1996 F150 & Larger F-Series Trucks
5
Jan 21, 2002 06:53 PM