Downhill Decelleration

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Jun 25, 2008 | 05:20 PM

JonnyAngle

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Racer

Joined: Apr 2007

Posts: 367

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From: Shakopee Minnesota

Downhill Decelleration

86 auto. When I am coasting downhill my car feels like it's shifting down and I am actually losing speed as I coast down hills. The codes I have are EGR and EST and Lean exhaust. No, the e-brake is not engaged either. Anyone know what the problem could be?

Jun 25, 2008 | 06:46 PM

JonnyAngle

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Racer

Joined: Apr 2007

Posts: 367

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From: Shakopee Minnesota

On a side note, if I touch the accellerator it feels like it shifts back up to how i think it should coast.

...Need any more info before diagnosis?

Jun 25, 2008 | 10:45 PM

crossfire7

Racer

Joined: Jul 2005

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From: tx

Maybe it is your torque converter unlocking.

Jun 25, 2008 | 11:24 PM

JonnyAngle

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Racer

Joined: Apr 2007

Posts: 367

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From: Shakopee Minnesota

its unlocking at speeds at like 40 mph. What would cause that issue?

Jun 25, 2008 | 11:29 PM

cwyates4

Melting Slicks

Joined: Jan 2008

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From: Jasper Texas

It does sound like the convertor too me also. How does the car run other than that?

Jun 26, 2008 | 12:39 AM

Demonic85

Team Owner

Joined: Feb 2006

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From: sw Ohio

This is completely normal and yes its the torque converter. If you tap the break it should do the same as touching the gas, rpms should go up a little.

Jun 26, 2008 | 01:41 AM

65Z01

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Joined: Dec 2000

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From: SE NY

Cruise-In II Veteran

Quote:

This is completely normal and yes its the torque converter. If you tap the break it should do the same as touching the gas, rpms should go up a little.

When coasting downhill the injectors are nearly shut off; take a look at the inst MPG next time. Mine goes up to 86MPG on a decent grade.

There is an EGR diagnostic routine on my site; the EGR issue may be part of the cause for the lean exhaust or maybe an exhaust leak before the O2 sensor. Not sure about the EST issue, other than to check the EST connector in the Tan/Blk wire below the brake booster.

Jun 26, 2008 | 02:09 PM

JonnyAngle

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Racer

Joined: Apr 2007

Posts: 367

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From: Shakopee Minnesota

Quote:

Originally Posted by 65Z01

THe EGR has been partially deleted (I'm not finished with it yet) but should I be losing speed when coasting downhill like that? THe car runs great otherwise.