Question about 1987 Subaru Gl 4WD

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1987 subaru carburator problems

Engine running lean, gum-out increases engine speed at idle and if goosed. EGR valve was leaking, replaced it so now it idles. Before EGR, just wouldn't idle. Fuel filter recently replaced. Could one of the electrical components on the carb cause this problem? It started suddenly. Everything fine, then parked it for 2 weeks and this started, just didn't want to run. I rebuilt the carb now, it had no issues except the accel pump shot was weak.. I'm an experinced carb person, done many in my years as a mechanic.

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  • Subaru Master
  • 75,797 Answers

You need to hone the accelerator pump well and adjust the throw of the pump rod as much as possible to get more fuel. Of course that is just a guess based on 100's of rebuilds i have done over the years. I have also found that Japanese carbs seldom turn out when rebuilt.

Posted on Nov 06, 2012

  • Patrick Matuska
    Patrick Matuska Nov 20, 2012

    Fixed it, was vacuum line, you comment completely no help.

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SOURCE: Subaru liberty/legacy 94 loss of power

SOUNDS LIKE YOU HAVE IT NARROWED DOWN TO THE EXHAUST SYSTEM.THE CONVERTER IS PROBABLY PLUGGED,CHECK THE TEMPS. COMING IN AND OUT.THEY SHOULD ONLY BE A FEW DEGREES DIFFERANT,IF THEY'RE ALOT HIGHER COMEING OUT IT'S PLUGGED.

Posted on Oct 11, 2009

planet-x
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SOURCE: subaru impreza rs 2.5 insanely high idle

check you dont have a split in the corrugated pipe from the maf to the swirl chamber (the big black plastic tank attached to the inlet manifold) or a leak into the intake somewhere, doesnt have to be a small vac tube.

Also you may have a sticking TB butterfly as my learned friend suggested.

Posted on Dec 02, 2009

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1 Answer

Idle up down


hunting or surging ilde. name the 2 RPMS, low and high , is it hot or cold engine this issue.? 400rpm or 1000 or 2000 all are diff.causes.
no year, stated. so cant help.
but ill answer in the generic,
1: the ECU (got a carb,? )
the ecu controls idle speed at all times.
if not , there is a problem (you)
A: air leaks in the induction will make motor race at some point the ECU/ISC loses control. and hunts. trying hard to correct it.
b: egr stuck open idle too low, iSC cant correct it,, bad EGR.
c: engine EFI running way too leak starving for fuel so it hunts for 2 reasons < ISC hunting, and lean does that.
lean is gross power loss and opening throttle bogs the engine.
so is double bad. ISC makes it worse,

all this breaks down to 2 reasons.
1: ISC bad. in some way (gummed up. or restricted inside)
2: bad fueling or air leaks. vacuum leaks.

try answers , the hot cold question and the 2 speeds, of the hunt.
lowest rpm and highest of the hunted range of RPM.

Nov 23, 2013 | Honda Civic Cars & Trucks

1 Answer

Increase then decrease idle when engine is cold especially


cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

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Code p0400 exhaust recirculation


EGR valve malfunction. The passages beneath the egr valve may be plugged with carbon deposits, restricting or blocking exhaust flow back into the intake. Or the computer control of the vacuum supply to the valve may be compromised. Take the valve off and clean the bottom and the passages, use a new gasket when remounting it. Check operation, valve should raise as warmed engine raises rpm's off idle. Put a finger lightly on the bottom of valve to feel it raise as the throttle is goosed. The valve is closed at idle, but as engine speed increases, valve is raised to allow some exhaust gasses back into the intake.

Aug 13, 2013 | 1998 Nissan Sentra

2 Answers

Po174


A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive. This code is not set on four cylinder engines (no bank 2).
WHAT A LEAN CODE MEANS
A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance . Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Dec 24, 2010 | Ford Explorer Cars & Trucks

1 Answer

2004 chevorlet impala ls engine cut off after a few seconds it keeps running only if foot is on the accellerator


idle air speed motor might be gummed up. it controls your idle speed. remove and clean with spray carb cleaner to see if symptoms improve. Other problems could be vacuum leak or stuck EGR valve or PCV valve.

Sep 07, 2010 | 2004 Chevrolet Impala

1 Answer

Engine just cutting out even while driving


Sounds like misfire.
On this cars common problem is - intake manifold gasket goes bad creating big vacuum leak , what makes fuel mixture very lean and causing misfire and even stalling engine.
Usually gasket goes bad toward rear of the engine.
How to check :
Buy carburator cleaner spray .
Turn engine on and spray cleaner in to intake manifold gasket area , from begining to the end of it.
If engine start choking or picks up the idle speed - it is your problem. Choking indicates big vacuum leak ,
idle increase indicates small vacuum leak.

Jun 03, 2010 | 2003 Nissan Altima

1 Answer

What is the 1987 pontiac fiero gt v6 check engine light code list?


CODE 12- NO DISTRIBUTOR REFERENCE PULSES ECM. CODE 13- OXYGEN CIRCUIT. CODE 14- COOLANT SENSOR HIGH TEMP CODE 15- COOLANT SENSOR LOW TEMP. CODE 21 - THROTTLE POSITION SENSOR VOLTAGE HIGH.CODE 22 - THROTTLE POSITION SENSOR VOLTAGE LOW.CODE - 23 MIXTURE CONTROL SOLENOID.FOR CARBURETOR ENGINE. CODE 24 -VECHICLE SPEED SENSOR. CODE 32 - BARO CIRCUIT LOW.CODE 32 - FUEL INJECTED EGR VALVE VACUUM SWITCH SHORTED TO GROUND.OR EGR VALVE SOLENOID CIRCUIT OPEN. CODE 33 - MAP SENSOR.CODE 34 - VACUUM SENSOR OR MAP SENSOR.CODE 35 - IDLE SPEED CONTROL. CODE 41 - EST CIRCUIT. CODE 42 - ELECTRONIC SPARK TIMING.CODE 43 - ELECTRONIC SPARK CONTROL UNIT. CODE 44 - LEAN EXHAUST.CODE 45 - RICH EXHAUST. CODE 51 - PROM OR MEM CAL.CODE 52 - CALPAK. CODE 53 -EGR VALVE CARBURETED ENGINE THE EGR VALVE VACUUM SENSOR HAS RECEIVED IMPROPER EGR VACUUM. CODE 54 - M C SOLENOID CARBURETED ENGINE MIXTURE CONTROL SOLENOID SHORTED OR FAULTY ECM.CODE 54- FUEL INJECTED ENGINE FUEL PUMP VOLTAGE IS LOW.CODE 55 - ECM MAKE SURE PCM GROUND CONNECTIONS ARE TIGHT.IF OKAY.REPLACE THE ECM.

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1 Answer

I have a 2000 Exp 5.4. I get the lean codes for both banks


Check the egr valve operation and make sure it is not sticking.If you have a scan tool and a hand help vacuum pump.While monitoring the dpfegr voltage on the scanner remove the vacuum hose to the egr and install the vacuum pump.Slightly increase idle so it does not stall and pump egr open then release the vacuum.Do this 8 times and then check the voltage with the scanner and make sure it does not increase more then 0.03v.If it does then replace the egr valve.There is a tsb for this concern.The number is 05-4-17.If you don`t have access to these tools then try tapping the egr valve and see if the rough idle stops.Hope this helps.Good luck.

Jan 14, 2010 | 2000 Ford Expedition

4 Answers

Im having ERG problems. Vaccum leak somewhere. Check engine light came on. check all around the engine for hoses off. could not find any.


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

Sep 21, 2009 | 2000 Mazda 626

3 Answers

99 4 runner when i get off the express way and get to the stop sign the idling will go all the way down and stop runne=ing, but will jput it in park and restart and all is well, driving 35 or 45 mph on...


This has to do with "lean" gas mixture (too much air, not enough gas)

The throttle air valve is not closing enough after being "wide open" at higher speeds, or

Fuel injectors are clogged and can't respond quickly enough for the drastic change.

The fix is the same for both. Use a name brand (not store brand) "Complete Fuel System Cleaner" $8 AutoZone. Not just an injector cleaner.

It should clear up in a couple of days of driving.

Changing the air filter will not affect this condition. - system already gets enough air.

Hope this helps!

Sep 14, 2009 | 1998 Toyota 4Runner

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