Question about 1998 Buick LeSabre

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98 buick lesebre cranks, wont start

Got spark at plugs but spark is orange, fuel pressure present at shraider valve when cranking. did not use guage but seemed like plenty pressure. has code p 0301

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Posted on Jan 02, 2017

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SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

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SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

  • 67 Answers


to properly clean and test the egr valve you should remove it from the car. disconnect vacuum, elect connectors, and check the gasket surface both on the manifold and on the base of the valve. you will need to buy or cut a new gasket most likely. when you apply vacuum to the control inlet, you should see the valve lift away from the seat. I use brake cleaner and compressed air to spray clean and blow out the valve just to test it and then go from there depending on what you find ---- one of the vacuum switches that controls it or a faulty vacuum line is a likely possibility also ---- so you should check them also. a vacuum pistol comes on really helpful here.

Posted on Jun 20, 2009

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SOURCE: 2000 buick lesabre no fuel system pressure. new

Your PATS security system is faulty...check the BCM up above the glovebox...Seems I've told you this before?

Posted on Jun 27, 2009

  • 1 Answer

SOURCE: 91 Buick Park Ave won't start

i just came across this problem myself the other day. i have a 91 buick park avenue that sometimes won't start. i checked several things out like cable connections and coil pack etc. etc. come to find out it was the wiring that came off the coil pack and connects to the crank sensor. the wiring that ran over top of the water pump had finally heated up so bad the coating on the wires had melted and when the engine got hot enough the wires would come in contact and send false signals to the computer not letting it start. after the car cools down and the wires contract it would start. so check the wires from the coil pack to the crank sensor to make sure the wires are not melted together.

Posted on Jan 16, 2010

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This is something that you cannot afford to throw any more money at. Get a timing light to check to see if there is spark. Use a pressure guage to check fuel pump. Get bug lights to test injectors.

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My ford explorer will crank but not start. Gas sounds like its flowin through fuel pump what could be the problem

The main thing you want to thing about in a no-start is Air, Gas, Spark, Compression, Timing, and Exhaust. Those are the main concepts you need for a vehicle to start. If it cranks then you may want to start with you charging system. Use a multi meter to read the volts of the battery to see if they are at 12v or higher. If your charging system is ok then the next thing you would want to check is fuel pressure. If you have a fuel pressure guage or even a pen, find the fuel rail and a small cap that screws off. There remove it and press it down with the pen to see if fuel pressure is there, or if you have the fuel pressure guage then hook it up to that spot and put the key in the on position to get an accurate reading. Once there if pressure is low could be a fuel pump, fuel filter, or fuel regulator. Also, pull a plug wire out, and carfully SET IT ASIDE where you can see it, DO NOT HOLD IT while doing this, crank the engine and see if a spark is coming our form the plug. If that still does not point to a solution then its time to check the compression. A special tool is required to this, take a spark plug out and connect a compression guage to read if accurate compression is present for each combustion chamber.

Hope this Helps!

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if the car is cranking you should ensure that there is fuel supply,check at the shrader valve on the top of the fuel rail.if there is substantial amount of gas it is probably ok but you should really hook up a gas guage to ensure proper pressure,if there is no pressure check fuse 54 for fuel pump,if is ok remove rear seat and access fuel pump at r side of tank,remove connection and measure for 12v on the brown ( ground) wire and the red wire (power) these two wires are the largest,12v should be present when cranking the engine if there is no voltage present you may have a bad pump or a faulty fuel pump relay,if you have gas spark should be checked,remove a coil and a spark plug,examine the condition of the plug, if it is wet then your engine could also be flooding, plug in the coil and attach the plug to it, have somone crank the engine while you observe for spark(do not hold the plug at this point as it is dangerous) You must have both gas and spark to start a engine,If your engine is not cranking and is making a clicking sound you may have a bad starter,if there is no sound at all try a different key as the EWS or the immobilizer may have lost the code and doesnt recognize the key, Please attempt and let me know what happens, thanks

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1991 Buick Park Avenue Ultra dies while driving. replaced crank sensor, coil pack wiring harness. oil pressure guage flies back & forth

It is most likely a sensor. It is common in these. You may check them with an ohmmeter.
You may also test relays the same way.

A vehicle needs gas and spark to run. One of them is not getting to motor. You can check fuel pressure on test port on fuel rail for fuel.
You can pull off a spark plug, plug it back into wire, lay it on top of motor, have someone else crank, while you watch for spark, Put back in, move to next plug wire.

Nov 08, 2009 | 1991 Buick Park Avenue

1 Answer


when this happens check for spark at the plug,
and have someone crank it over for you and check for fuel pressure at the bleeder valve is there fuel but just trickles out check with pressure gauge.
next check crank sensor if you have a dis system.
if all else fails check the ECM or the ignition module
hope this helps

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I need to change the fuel filter for my 1994 buick le sabre

There is shraider valve on the fuel rail to test pressure, it can also be used to releive fuel pressure.
There is no need to dissable the fuel pump and crank the engine.

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