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4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.
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Old 01-31-2014, 09:23 PM   #1
Indy-Vert

 
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Default Who do I trust to do a '99 4.6 2V refresh?

My '99 GT vert is at 130k with a hint of knock at cold start-up and acts generally tired all-around. I want to breathe some new life into the motor. Can somebody give me some thoughts? I have a limited budget(don't we all these days?), so getting crazy is out of the question. I want my 260HP/305lb-ft ratings back and then some. I don't want to spend more than $2-3k and have the space/tools to do most rebuild tasks short of machining, et al. What would some of you guys do in this situation? I have access to folks with lots of basic engine building experience, but none with modular V-8's. Should I crate it up and send it somewhere?

stock 4.6L 2V
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Old 02-01-2014, 12:42 AM   #2
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If you crate it up and send it out, a basic rebuild will eat most of that budget. At 130K miles, I highly doubt that motor is in need of a rebuild, but a compression test will tell you for sure. A stock automatic GT vert is a dog any way you look at it, odds are that is what you are feeling.

Full exhaust, gears, and a stall converter should wake it up nicely. That or just piece together a supercharger kit.
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Old 02-01-2014, 10:19 AM   #3
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You're right. The car is a relative dog. I do have an upgraded exhaust and a higher stall speed converter in it. Maybe you have a thought there with some taller gears. That may appease me until the noisy rod lets loose. Then I could justify the refresh.
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Old 02-01-2014, 01:19 PM   #4
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Originally Posted by Indy-Vert View Post
That may appease me until the noisy rod lets loose. Then I could justify the refresh.
No need to get sarcastic, that's important info that you left out of the first post. The modular engines are some of the easiest to work on. You can rebuild it yourself, or take it to any good mechanic that you know.
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Old 02-01-2014, 05:17 PM   #5
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jc, im surprised that you didn't mention a mark viii swap, that's my suggestion. With proper maintenance, these motors run forever.
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Old 02-01-2014, 07:37 PM   #6
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jc, im surprised that you didn't mention a mark viii swap, that's my suggestion. With proper maintenance, these motors run forever.
It's a good swap, but honestly, it's better for the NPI, going from a PI gt to the IMRC-less 4V isn't going to feel like much difference.
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Old 02-01-2014, 07:47 PM   #7
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No need to get sarcastic, that's important info that you left out of the first post. The modular engines are some of the easiest to work on. You can rebuild it yourself, or take it to any good mechanic that you know.

No sarcasm intended. And if you read my post, I did mention a slight hint of "knock". Should have qualified that as possible rod-knock, but your input is valued, nonetheless.

So with that being said, would you simple replace the rod and crank bearings, install new rings and re-assemble? Or would I need to hone cylinders also?

Last edited by Indy-Vert; 02-01-2014 at 07:51 PM.
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Old 02-01-2014, 09:18 PM   #8
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Originally Posted by Indy-Vert View Post
No sarcasm intended. And if you read my post, I did mention a slight hint of "knock". Should have qualified that as possible rod-knock, but your input is valued, nonetheless.

So with that being said, would you simple replace the rod and crank bearings, install new rings and re-assemble? Or would I need to hone cylinders also?
A hint of a knock at cold start on a modular engine is almost never a rod. It's a timing chain tensioner, a lash adjuster, or piston slap.

Are you certain that it's a rod knock?

4.6L rod knock =


Piston Slap =


Lifters =

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Old 04-05-2014, 11:47 AM   #9
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Never diagnosed it, but sounds more like piston slap than the above example of rod knock.

Thx for the audio-visuals!
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Old 04-06-2014, 10:28 AM   #10
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If you determine you do need to rebuild. You should check into a factory Ford rebuilt from a dealer. Online price for a long block is around 3500, however dealers are a little flexible. I was able to get a long block for a 2000 GT for 2975. By the time you get rings/bearings,pistons and machine work,you could have a full rebuilt motor. Think about it, you'll have a new bottom end but your heads still have 130K on them. PM me if you have any questions..Good Luck
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Old 04-06-2014, 10:28 AM
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