Differences between 3.4 engines

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12-14-2017, 07:41 PM

Coopduc

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Differences between 3.4 engines

I'm looking at used engines for my '99 996. There are a couple of them on eBay, one is a 1999 M96.01 engine and one is a 2000 M96.04. The '99 has a mechanical throttle and the 2000 has electronic. I need the mechanical one and It's an easy conversion. Besides that, are there any differences I should be concerned about? Is there a preference for one over the other?

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12-14-2017, 07:46 PM

Blue Chip

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You sure it’s an easy conversion? There is one here on the forum for sale that seems to have all of the right upgrades and it’s a cable throttle.

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12-14-2017, 07:52 PM

Coopduc

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Pretty sure it's as simple as unbolting the electronic throttle and bolting on the cable one. My car is already set up for the cable.

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12-14-2017, 07:56 PM

ltusler

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I think you will need to change the engine wire harness and the TB. You will need the ICV connector.

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12-26-2017, 01:37 AM

rattlsnak

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There could also be a fuel line issue. Some have a return line and some use a returnless system but not sure on the cutoff years..

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12-28-2017, 12:30 PM

Kris Murphy

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Quote:

Originally Posted by rattlsnak

There could also be a fuel line issue. Some have a return line and some use a returnless system but not sure on the cutoff years..

I just did this last year.

1. You need to swap the throttle body.
2. You need to swap the entire engine wiring harness. Just do it one connection at a time and you will be fine.
3. You may need to swap the fuel rails. Some cars have the fuel lines going through the AC compressor for fueling.

I did both swaps in under 4 hours (included removing both wiring harnesses.