computer removal
Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
Not too difficult, but you will wish you have had smaller hands.
Start by removing most of the plastic fender well on the drivers side. You only need to remove the screws on the outside.
BE CAREFUL NOT TO BREAK OFF THE HARNESS PLUG OR ITS PINS!
There is a bolt holding the harness into the eec computer(8mm or 10mm head maybe?)
Remove this bolt and tie the harness out of the way.
There are two bolts or screws holding the computer in the firewall.
You may have to remove more components, but if you have the fender well pulled back far enough it will come right out.
Depending on your module, you may have to cut out the kick panel behind the eec to allow enough room for it.
I am not familiar with the jet performance module, but be careful as your eec-iv with speed density programming will have limited tuning options.
Start by removing most of the plastic fender well on the drivers side. You only need to remove the screws on the outside.
BE CAREFUL NOT TO BREAK OFF THE HARNESS PLUG OR ITS PINS!
There is a bolt holding the harness into the eec computer(8mm or 10mm head maybe?)
Remove this bolt and tie the harness out of the way.
There are two bolts or screws holding the computer in the firewall.
You may have to remove more components, but if you have the fender well pulled back far enough it will come right out.
Depending on your module, you may have to cut out the kick panel behind the eec to allow enough room for it.
I am not familiar with the jet performance module, but be careful as your eec-iv with speed density programming will have limited tuning options.
Thread Starter
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Freshman User
Joined: Mar 2011
Posts: 44
Likes: 0
From: Kentucky
yes its my 97 f250 5.8
i had it scanned once for check engine light, i couldn't remember where they hooked it up at. o2 sensor was the check engine light problem. got it fixed!...i've seen good things from jet performance, on a lifted 2000 f250 v10, he got about 4 mpg more and his power and shifting was better. I seen on another site you can take the e-brake loose and slide it out that way also, not sure how that works?
i had it scanned once for check engine light, i couldn't remember where they hooked it up at. o2 sensor was the check engine light problem. got it fixed!...i've seen good things from jet performance, on a lifted 2000 f250 v10, he got about 4 mpg more and his power and shifting was better. I seen on another site you can take the e-brake loose and slide it out that way also, not sure how that works?
Elder User
Joined: Dec 2008
Posts: 805
Likes: 1
From: Small town Iowa
1) he's on the right forum
2) its runnin OBD II not speed denisity
3) subscribed! I wanna hear your improvements due to my plans for the 96
2) its runnin OBD II not speed denisity
3) subscribed! I wanna hear your improvements due to my plans for the 96
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Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
Thank you for correcting me. I had forgotten that the 5.8s had mass air. The chip should work.
Does he have an EEC-V then?
Does he have an EEC-V then?
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Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
Just because the OP's truck is a 1997 9th gen. truck does not automatically make it OBD-II. In most cases these off-the-shelf chips do very little on this vintage truck. They firm up the shifts a little and bump the timing a few degrees which in many cases requires the use of higher octane fuel. The timing bump can be accomplished for free by bumping the base timing up from 10 BTDC to 12-14.
If the OP's truck is OBD-II my money is on the Jet chip will have the same effect, lighter wallet and no real performance or mileage gain.
If the OP's truck is OBD-II my money is on the Jet chip will have the same effect, lighter wallet and no real performance or mileage gain.
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Freshman User
Joined: Mar 2011
Posts: 44
Likes: 0
From: Kentucky
my truck dont have mass air flow sensor...not sure what generation it is, but its the same as 92 - 97 old body style fords, it has the stock square air box with 2 tubes running to the throttle body, if it has a mass sensor somewhere i dont know where its located??...Jet says you can use regular octane for daily driving, but for towing and better performance 89 or higher is recommended. I've seen the chip work on a 2000 v10 and older model mustangs, better gas mileage, a little more power, and makes shifting easier, its not a rocket but you can tell a difference, they make 2 different kind, one for automatic and one for manual, i've done a lot of research and heard nothing but good reviews, so i'm going to try it...if you dont like it, just unplug it and it goes back to stock settings, so as Jet says. Havent had the chance to locate the computer yet. I'll keep everyone updated
Thread Starter
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Freshman User
Joined: Mar 2011
Posts: 44
Likes: 0
From: Kentucky
Just because the OP's truck is a 1997 9th gen. truck does not automatically make it OBD-II. In most cases these off-the-shelf chips do very little on this vintage truck. They firm up the shifts a little and bump the timing a few degrees which in many cases requires the use of higher octane fuel. The timing bump can be accomplished for free by bumping the base timing up from 10 BTDC to 12-14.
If the OP's truck is OBD-II my money is on the Jet chip will have the same effect, lighter wallet and no real performance or mileage gain.
If the OP's truck is OBD-II my money is on the Jet chip will have the same effect, lighter wallet and no real performance or mileage gain.
Tuned
Joined: Jan 2013
Posts: 398
Likes: 3
From: Vancouver Island BC
"1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks"
Early '97s were 9th gen... They switched to the 10th gen later on in the year.
Mines a "1997" That was built in december of '96
Early '97s were 9th gen... They switched to the 10th gen later on in the year.
Mines a "1997" That was built in december of '96
Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
Yup 97 F250/F350 "Classic" is the leftover 9th gen stuff. They also had the 97 F250 "New" edition...
As for setting timing... How to properly set the timing on a 302 or 351 - FSB Forums
As for setting timing... How to properly set the timing on a 302 or 351 - FSB Forums
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
The procedure F100 posted is pretty good, by buddy Sackman created that write-up. If you want to bump the timing then set the base from 10 to something else higher such as 12,13,14...whatever your particular engine/trans./fuel combo will handle.
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
Likes: 43
From: New York
So to answer your question, PCM comes out from the engine bay side, but you'll need to remove the inner splash shield to get it all the way out.
I was under the impression that all vehicles were required to be OBD2 compliant starting in model year 1996. Was there some sort of exception for heavy duty trucks?
If indeed it's OBD2, I'd want to take advantage of the ability of that class of PCM to take a flash tune rather than an old school J3 adapter chip. That said, I question the value of custom tune on a stock engine.