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4l60e no engine braking

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Old Mar 25, 2025 | 05:51 AM
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Default 4l60e no engine braking

Hey guys, I’m new to the forum and have a question someone can hopefully answer..

I recently rebuilt a 4l60e (stock) for a Holden commodore (I’m in Australia)

Anyways, on its first test run I noticed it didn’t have any engine braking/ would automatically downshift. But if you let it coast and slow down once you accelerated again it would take if in say 2nd gear.

just wondering if anyone has any direct I should be heading in or any schematics for the overrun circuit?

Any help would be much appreciated
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Old Mar 25, 2025 | 08:18 AM
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Originally Posted by Tyler_846
Hey guys, I’m new to the forum and have a question someone can hopefully answer..

I recently rebuilt a 4l60e (stock) for a Holden commodore (I’m in Australia)

Anyways, on its first test run I noticed it didn’t have any engine braking/ would automatically downshift. But if you let it coast and slow down once you accelerated again it would take if in say 2nd gear.

just wondering if anyone has any direct I should be heading in or any schematics for the overrun circuit?

Any help would be much appreciated
Check your manifold pressure switch
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Old Mar 25, 2025 | 10:52 AM
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The 4l60e will not have any appreciable overun in D4 position regardless of gear Unless modified to do so.
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Old Mar 25, 2025 | 04:26 PM
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Thanks guys I’ll check the pressure switch. Are you meaning the MAP sensor?

also I don’t think it’s engine braking in 1-2-3 I’ll have to confirm.
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Old Mar 25, 2025 | 06:10 PM
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Originally Posted by Tyler_846
Thanks guys I’ll check the pressure switch. Are you meaning the MAP sensor?.
No, they mean the pressure switch in the transmission, bolted to the valvebody. It has five switches on it to tell the PCM what position the shifter is in.
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Old Mar 25, 2025 | 11:00 PM
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Thanks mate I’ve just purchased one
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Old Mar 25, 2025 | 11:54 PM
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Originally Posted by Tyler_846
Thanks mate I’ve just purchased one
That's most likely gonna get you fixed up. I had one bad right out of the box on my freshly built 4l80e. It shifted just fine but no engine braking and didn't report the right gears on my Dominator
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Old Mar 26, 2025 | 05:13 PM
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Originally Posted by 91 Z28
That's most likely gonna get you fixed up. I had one bad right out of the box on my freshly built 4l80e. It shifted just fine but no engine braking and didn't report the right gears on my Dominator
That’s good to know/ hear!
man I hope it fixes it. It’s not new by any means it’s the old one and it’s done 261,000k’s
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