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Step by Step guide to installing a Mark VIII motor in a 96+ GT.

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Old 11-28-2014, 07:07 AM   #161
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Originally Posted by fastbackford351 View Post
Question: What about the cruise control cable? I am assuming that my SOHC cable will not work. What cable / module do I need to make my cruise work properly.

I needs my cruise control to be functional.


Click the image to open in full size.
You can actually use the GT cable, but you will need to relocate the cruise module closer so that the cable will reach. Otherwise, if you get a cobra cable it will bolt right up to your current cruise module.

Now that I look at it, you are using the 97-98 intake, so it might reach?
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Old 11-28-2014, 08:39 PM   #162
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Thanks.

We're about to find out.
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Old 12-04-2014, 11:33 AM   #163
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It has been a long time since I did the swap but I remeber the GT CC cable being too short even with a Cobra intake
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Old 12-04-2014, 04:46 PM   #164
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It has been a long time since I did the swap but I remeber the GT CC cable being too short even with a Cobra intake
well there ya go i guess!
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Old 12-29-2014, 03:52 PM   #165
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I have a question:

I have the engine installed and cold start is a bitch. It is flooding out and I'm grinding on the starter for 2 minutes trying to get it started and it finally fires up.

What are the injectors rated at GT vs Mark VIII?
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Old 12-30-2014, 01:17 PM   #166
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I have a question:

I have the engine installed and cold start is a bitch. It is flooding out and I'm grinding on the starter for 2 minutes trying to get it started and it finally fires up.

What are the injectors rated at GT vs Mark VIII?
the GT is 19lb/hr and the mark viii is 24lb/hr. The orange top is 19 and the greenish/blue is 24.

I ran mine on the 19's for awhile, and then moved over to the 24's about 5k miles later. ran the same when i switched. I am using the stock GT MAF as well. no tune.
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Old 12-30-2014, 01:38 PM   #167
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Yeah, I just found out that the Mark has #24 injectors vs. the 19# GT so I'm hoping that switching back to the 19# will stop the flooding.

If it doesn't then I'm back to scratching my *** and blinking.
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Old 12-31-2014, 09:41 AM   #168
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double check your vacuum lines and also your IAC.

when it does fire up, how does it run?
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Old 12-31-2014, 09:52 AM   #169
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It seems to run OK but I'm burning the hell out of the starter just getting it started.

Let me ask you something.

If I pulled the ECU out of a Mark VIII would that play nice with my Mustang? I was thinking about just using the Mark VIII MAF, injectors and ECU and going that route.

Thoughts?

Thanks.
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Old 01-01-2015, 03:42 PM   #170
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Putting the Mustang injectors back in cured the flooding problem.

The cold cranking problem is still happening though. I'm thinking it's a crank sensor or a cam sensor.

I was able to get it started yesterday and took it for a short burst. Cruising along it was smooth as silk but once I put my foot in it a couple of the coils showed their asses.

At idle, when I closed my eyes, I swear if I didn't know better that I was sitting back in my Mark VIII. Put it in gear and it idles down nicely. No codes being thrown, AC blowing cold.

Today was 1/2 price day at the LKQ. I went this morning and low and behold there was a 98 Mark VIII fresh on the ground and intact.

The coils looked great so I snagged everyone of them, grabbed the alternator as well. Also grabbed the cruise control module and cable and a couple each crank and cam sensors.

I'm close, people.

I'm close.
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Old 01-02-2015, 07:37 AM   #171
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yea not sure on the ecu swapping, id figure it wouldn't work, but no clue hah

Interesting that the injectors were giving you issues, wonder if one was sticking open causing an issue. Ive been running my 24lb/hr ones for quite some time on the stock GT tune and havn't given me any issues.

that being said, cold starts i have to crank it maybe 2-3 sometimes before it does start and run good. It cranks for a second, fires, and dies. Then the next crank, fires up and runs great, I'm attributing that to the tune, because it runs great otherwise.

Glad to see youre making progress on it!
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Old 01-06-2015, 02:37 PM   #172
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It lives!

I still have to crank on it a bit to get it going but she seems to run and drive just fine. There is a little bit of stumble at speed but every time I drive it now it seems to be getting better and better. Saying that, when I was at a stop light today with the top down I turned on the AC and the car died. It started right back up but still....

Somethings I learned that may help others:

Using the stock GT injectors stopped the flooding problems I was having when using the Mark VIII injectors. (this is bullcrap. Use the Mark VIII injectors and get the car tuned)

I used the stock GT, MAF and a custom tuned ECU.

Regarding the cruise control, I used the cruise control cable from the Mark VIII to hook up to my stock cruise control module and it works flawlessly.

I used the Mark VIII throttle cable

I went with a Cobra fuel rail because the stock GT one didn't fit for crap, clearance issues with the valve cover and the Mark VIII one wasn't compatible at all needing a return line to the tank which I really didn't feel like hassling with.

The Cobra exhaust manifolds I don't think were necessary. Put side by side with the stock GT versions I didn't see a nickles worth of difference. The Cobras were 'wavy' but they looked to be the same diameter and they were identical in shape. But I had already bought them though so I used them.

This thing pulls like a beast compared to the 2v. I still need to take care of some niggley issues, like dressing up the wiring but what an upgrade.
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Last edited by fastbackford351; 02-15-2015 at 07:32 AM.
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Old 01-09-2015, 07:19 AM   #173
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Damnit so much.

I was driving it home from my brothers house and it started to really run like crap. I got it home and was going to see if it would crank back up but as soon as I opened the car door I was greeted with a lap full of soaking wet 8 month old labrador puppy so I lost my presence of mind and didn't try it.

But the next morning I had diddly squat for fire. Nothing. Nada. Just crank, crank, crank, crank.
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Old 02-15-2015, 07:27 AM   #174
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Well after a month of farting around chasing ghosts I finally broke down and got the car tuned. Duh. I could have saved myself hours and hours of hassle if I would have done this from the get go but I guess I was thrown off because sometimes everything seemed to work ok so I kept thinking an intermittent problem like a bad connection, or sensor or, or, or, or....

I enlisted the services of James Gordon, aka Tuning by James and after several hours of tuning it is running and running pretty well. It isn't perfect yet but by God, it is a helluva lot closer than it was.

I put the Mark VIII injectors back in and am running copper NGK plugs, per James' advice.
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Last edited by fastbackford351; 02-15-2015 at 07:31 AM.
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Old 02-15-2015, 07:27 AM
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98, 99, ac, cobra, coolant, delete, engine, fit, fuel, hose, mark, mustang, rails, remove, transmission, viii, wiring

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