Question about 1991 Pontiac Firebird

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Car starts strong, as usual, but then dies in a few seconds

Brand new egr valve; checked but didn't find any vacuum leaks. it seems like it is being starved for fuel, but if it was the fuel pump, it wouldn't get fuel in the first place, would it?

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You could have a clogged fuel filter or a bad catalytic converter...mine was bad(converter) and acted the same way til i replaced it

Posted on Jan 20, 2009

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2000 firebird 3.8 series 2. New o2 sensors,egr valve,fuel filter.starts ok cold, 2-3 min.,idles rough and dies.o2, egr,the,Eva codes


Vacuum leak , IAC valve - idle air control , Go to your tube an check out videos on checking for vacuum leaks an how to test IAC valve an cleaning throttle plate an IAC - air passages ! Eva codes ? what code # ?

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My 84 rabbit, will run great for 20 minutes to half hour, when it gets warm it starts jerking badly, like its not getting gas, and then when I pull over it dies. If I wait a few seconds it will start back...


Well something is leaning out the mixture when warm. I'm thinking the EGR valve is either sticking or its vacuum diaphragm is leaking. the EGR is usually not allowed to work until the engine warms up. The EGR vacuum modulator could also be at fault.

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When you take your foot off the excelerator the car dies. Can't seem to find the problem.


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How to remove and inspect throttle body on 1992 mazda miata


Things that make your engine do what it is doing.

1. Vacuum leak
2. EGR valve

Find the vacuum leak if there is one.. and check the function of your EGR valve.

A functioning EGR valve with an ORAL vacuum line suction test will cause the engine to stall / die when suction is applied to the ORAL external line.

Even if it passes the ORAL test... it can still have carbon build inside the plumbing that does not allow the seating pin to fully seat and the engine will surge or be hard to start when warm.

So check / listen carefully for vacuum leaks and check the EGR valve.

Feb 10, 2010 | 1992 Mazda MX-5

1 Answer

Truck starts and idles a little rough but when any throttle is applied it backfires and dies. any ideas


here are a few things that will cause a backfire, egr system not working properly, vacuum leak around manifold or hoses, damaged valve springs or sticking valves, check the egr valve for carbon build up in passage way, where it mounts to engine.

Dec 22, 2009 | 1987 Nissan Pickup

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Location of EGR valve for 4.6 liter engine? how do you remove the EGR valve?


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EGR VALVE IS #2.

Please wait for second post to answer your second question....comes with a few pictures.

Nov 16, 2009 | 1992 Ford Crown Victoria

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Engine malfunction


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

Oct 24, 2009 | 2002 Mazda Tribute

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How do you clean the EGR valve on a 99' Honda Civic?


Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.

Mar 29, 2009 | 1999 Honda Civic

1 Answer

My 99 Alero starts up then dies after 1 second. I


check air flow duct where the throttle valve is . check the pvc valve . make sure it isnt stuck open. check the egr valve . it will stick open stall out motor .use a scanner it will tell you if you got egr valve problems. check fuel pressure. it could be stop up fuel filter bad fuel pump fuel pump relay.your car problem sound like a major vacuum leak . change spark plug and wires if they have not been change in a while. it could idle air control. hook a scanner .it could give you a code.

Mar 22, 2009 | 1999 Oldsmobile Alero

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