what is it?
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
If the truck is a 351HO(4bbl) it should be Duraspark and the cab is a 4180 Holley, no feedback, I don't recall if the last one I worked on had the solenoids pictured, but, it has been a while.
Senior User
Joined: Mar 2006
Posts: 212
Likes: 0
From: Morganton, NC
those look like TAB and TAD solinoids as mentioned in a prior post.
With having them, I am led to believe your truck is CFI. Easiest way to check, is to count how many wires are going into your distributor. three going straight into it, and you are carbed. More than three going into a module on the side of the distributor, and you have CFI.
Neither need the TAB and TAD stuff. You may find a check engine light and in rare cases part throttle detonation if you remove all emissions equipment eith CFI/EFI.
With having them, I am led to believe your truck is CFI. Easiest way to check, is to count how many wires are going into your distributor. three going straight into it, and you are carbed. More than three going into a module on the side of the distributor, and you have CFI.
Neither need the TAB and TAD stuff. You may find a check engine light and in rare cases part throttle detonation if you remove all emissions equipment eith CFI/EFI.
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
Guys, DO NOT make any assumptions when it comes to ignition or emissions equipment on any of these trucks, about the only thing that is for sure is that the EFI 5.0 has TFI-IV. There was even a non catalyst, non egr non AIR spec for the 300 right until they went fuellie...
I poked around his photobucket a bit, that truck definitely has a 351 HO, with a 4180 Holley 4bbl on here. Guaranteed that truck has Duraspark II. Odds are those solenoids are controlled by a module of some sort under the dash, not an ECM per se. I have seen that before.
I poked around his photobucket a bit, that truck definitely has a 351 HO, with a 4180 Holley 4bbl on here. Guaranteed that truck has Duraspark II. Odds are those solenoids are controlled by a module of some sort under the dash, not an ECM per se. I have seen that before.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Guys, DO NOT make any assumptions when it comes to ignition or emissions equipment on any of these trucks, about the only thing that is for sure is that the EFI 5.0 has TFI-IV. There was even a non catalyst, non egr non AIR spec for the 300 right until they went fuellie...
I poked around his photobucket a bit, that truck definitely has a 351 HO, with a 4180 Holley 4bbl on here. Guaranteed that truck has Duraspark II. Odds are those solenoids are controlled by a module of some sort under the dash, not an ECM per se. I have seen that before.
According to the service manual, it could have a hyberdized EEC-III, with either a DS-II or DS-III module.
Or it has a EEC-IV, TFI-IV ignition system. The manual doesn't differentiate between 351W or 351HO so I couldn't state which is which and will take your word for it.
It does look like it has a DS module under the solenoids. To determin if it's a DS-II or DS-III the color gromet needs to be checked on the module. Blue Grommet is DS-II, Yellow Grommet is DS-III.
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Senior User
Joined: Aug 2009
Posts: 124
Likes: 1
From: nova scotia
thanks for all the help guys! the grommet on the module is blue.the front solenoid seems like the wires go to the a/c compressor and over to the accumulator.i took a pic of some module under the dash just to the right of the steering column. i also took a pic of a couple relays that are on the firewall on the drivers side. do these relays have something to do with this system. thanks .
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
That module under your dash is for the cruise control, the relays on the firewall could be for a few things, need to chase the wiring and see where they go. I seem to recall my 6.9 truck having one tied into the factory trailer wiring package. I have the harness somewhere from the old cab. Does the truck have a wire going from the batt+ with a fuseable link leading to a terminal stud by the brake booster?
As said above, the blue strain relief means Duraspark II.
As said above, the blue strain relief means Duraspark II.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Post the color wires, and how many of each, on the relays, and I can track it down.
On your truck the EEC only controls the tab and tad solenoids, and on some it controls canister purge, limited EGR functon, timing retard through a vacumm solenoids to prevent detonation.
It will be easy to remove on your truck with little ill effect. But if it's running good I'd leave it alone.
On your truck the EEC only controls the tab and tad solenoids, and on some it controls canister purge, limited EGR functon, timing retard through a vacumm solenoids to prevent detonation.
It will be easy to remove on your truck with little ill effect. But if it's running good I'd leave it alone.
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