Question about 1991 Toyota Corolla

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I have 1991 toyota levin 4age motor at idle revs go up and down slighty and seems to be running a bit rich ie black smoke from exhaust when revving high been trying to find manual for tuning data

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  • leanne_povey Nov 18, 2009

    need a manual to identify where these are thanks

  • John Remenyi May 11, 2010

    Possible idle air control valve. May also be stuck EGR valve or clogged catalytic converter. Also look for vacuum leaks. Any check engine lights or other symptoms?

  • Anonymous Mar 14, 2014

    Toyota conquest 86 modle 4AGE revs drop when hot and cuts out

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My engine check light on 4age engine dim before start, will not go off after started and slump throttle black smoke from exhaust

Posted on Mar 13, 2010

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Black smoke comes from exaust when I start. Could it overfuel and how can I fix it if its a new carb on my 88 2e 12valve


assuning there is nothing major wrong, get some forte injector and use it as recommended. I once had a renault laguna diesel fail an MOT test, a roadworthiness test that is, on emissions...it was absolutely chucking out black smoke but the engine ran well. I put 2 bottles of injector cleaner in the half full tank and went out for an eighty mile drive revving the engine in the lower gears. I returned to the testing station an hour and a half later and the engine was running perfectly.
Alternatively, assuming the engine runs well but is just a little smokey, have it terracleaned, this will remove most of the carbon deposits from the engine/exhaust and should increase the life of your engine simultaneously improving fuel economy

Oct 26, 2015 | Cars & Trucks

1 Answer

4.0l 6 cylinder. What are the probable causes of DTC P0171?


no. (but the isc valves loves to stick but will not cause black smoke)
the 4.0L is one of 5 million made, it's well known,
the black smoke don't lie. it's rich and the cat seems burned up too.
as with black smoke the cat will try to catalyze all that and glow red hot. is your cat missing?>
so why not believe the code 171, its real and is catastrophic failure. there are 2 engines here, FED and California.(exhaust)
(2 different exhausts and sensors there.
as they say, fix what is OBVIOUSLY bad, 171
(find why using tools or inspections)
Fuel System Lean (Bank 1)in most cases the exhaust is cracked near B1S1 0xy sensor
this causes it to stick at 0volts, (lies) and the PCM sees that obvious lie then goes rich. (limphome rich)
if the pcm cant measure oxygen, it must now guess at fuel trim.(bad that.)
it goes rich, so you dont melt pistons running lean.
(by design)

bad front oxygen sensor (aka , up stream bank 1)
in calif cars, it can have a split exhaust on the I6 and have 3 sensors. (hope not yours, do look..)
most have 2 sensor, front and the useless behind cat sensor(B1s2)
S2 is useless for running mix, the rear is for smog test the cat.

so it rich, and now misfires. and the spark tips are black.
and it misfires to bad it can even idle, sure. (Drops)
the cause, is too rich.
the 171 means the PCM sees it stuck at 0v forEVER.

there are in fact other causes.
but these 2 are top cause.

on all 3 of my 4.0L engines
the exhaust manifold cracked on the under side.
side facing block. (i use a hose to ear to hear the putt putt puts, (with FULL PPE protection from burns from a dead cold engine.) ask how.
even the SST exh. man. did that.

or the header flange gasket is TOAST. (that too putts when bad.)

Aug 03, 2015 | 1996 Jeep Grand Cherokee

1 Answer

Idle is high at start - 1800 rpm. Seems like excessive white smoke from exhaust. Put into reverse and back out of driveway it has a regular shudder (bump bump bump) but not hard metal grinding sound.....


white smoke out of the exhaust would be a sign that it is burning coolant... if it goes away after it warms up, it could just be condensation inside the exhaust pipe. 1800 rpm is a very high idle, maybe have your IAC motor on the throttle body checked... check engine light? if so have the code read at your local auto zone.

Aug 09, 2011 | 1998 Toyota 4Runner

1 Answer

94 toyota land cruiser runs rich, rough idle, no power


You have a fuel injected car. Things that can cause too rich would be a bad altitude sensor like the map or mass air flow depending on which one you have.
Anything that would cause excess air to go into the exhaust system like a cracked exhaust pipe before the 02 sensor, or low compression, or a stuck open pcv valve, intake gaskets, throttle body base gasket.
Or a Throttle position sensor which is telling the computer you foot is on the gas when it is not.
Its possible you have a bad PCM,, or coolant temp sensor saying the motor is still cold as its warming up.
Its possible you have a vacuum hose somewhere on the engine with a big crack in it or its just inplugged and you dont see it.

But my first guess would be possibly a bad computer.
Try creating a big vacuum leak when its loading up. It should run better.

Also if you have an egr valve it could be stuck open a little causing excess air or an idle air control valve stuck open.

Does it clean up if you rev it up or does it blow black smoke reved and at idle. This could point towards the altitude sensor.

Dec 22, 2009 | 1992 Ford Explorer

1 Answer

Rich fuel mixture at idle, smoke from exhaust,


change the O2 sensor/s and the mass airflow sensor

Oct 10, 2009 | 1991 Volkswagen Corrado

2 Answers

Engine problem


ya its running very rich that why it makes that black smoke,this carbon is made because the sparks plugs does not make a good and sufficient spark,so i advice u to change the 4 spark plugs,also renew the air filter

Aug 23, 2009 | 1992 Toyota Corolla

1 Answer

RUNNING RICH AND MISSES,IT SMOKES BLACK


check your spark plug wires to make sure they are in the correct firing order, thats what it seems like the problem is

Apr 18, 2009 | 1993 Toyota Pickup

1 Answer

Running rich and blowing black smoke


Could be a number of different things.Fuel pressure relief valve not working,injector pulse too long,Is the air box lid securely fastened and air cleaner clean.Are there no leaks between the air box and throttle body(intake tube).Have you checked oxy sensor.air flow meter may be also possible.Try squeezing the flexible fuel hose enough to allow the engine to run and see if the engine reacts better if it does you have excessive fuel pressure.

Nov 20, 2008 | 1990 Toyota Celica

2 Answers

Running rich


idle mixture adjustment?

May 24, 2008 | 1991 Nissan Stanza

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