Question about 1995 Subaru Legacy

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My 1995 Subaru legacy randomly decelerates. It does not stall right away, but I will be pushing down on the gas as far as it goes and it will just keep slowing down, until finally I need to pull over and then it turns off. All of the lights on the dashboard go on when this happens; the emergency brake light, the AT Oil temp light, etc. It starts right back up unless it is cold out; then it may take a few tries. This deceleration does not happen only in the cold, although it is more frequent then. It usually happens at speeds over 60mph or when going up a hill. I have taken it to my mechanic, a subaru dealer, and had its transmission checked. No one can find anything wrong and it does not post any computer codes. Any ideas?

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  • Subaru Expert
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Usually random engine decells are caused by not changing the fuel filter and/or EGR concerns. The easiest way to rule out the EGR is to pull off the vacuum line going to the EGR housing and plug it with a small bolt or ideally a golf ball "T". The EGR is designed to allow exhaust gasses to be recirculated back into the intake system usually during freeway cruising and long uphill pulls to prevent engine over temp in the cylinders. The exhaust gasses slightly hinder the fuel combustion from burning at it's full heat intensity. Once you have plugged the EGR tube you will just need to drive the vehicle to see if any thing has changed. If nothing changes, I would start looking at ignition concerns for ex: spark plugs, plug wires, coil, coil connector for loose pins or brittle and/or broken wires. I hope this info helps...(subytech1)...
My 1995 Subaru legacy randomly decelerates.  It - 62664019

Posted on Aug 09, 2009

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  • Subaru Master
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The EGR valve is not operating smoothly. It be should fully close below 1500 rpm.

====

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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By any chance did you relace all spark plugs and wires going frm spark plugs to distrubuter.? if not try that then let me know what happened..

u may need a new distrubuter as well as wires and spark plugs

Posted on Aug 27, 2009

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