Question about 1993 Buick Riviera
The mass air filter, crank shaft sensor, the Vat key, and the pass lock modules and all coils and modules have been replaced. The computer was replaced 6 years ago.
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Posted on Jan 02, 2017
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
SOURCE: buick lesabre nightmare 2
Posted on Aug 01, 2008
Check ecm for number 1228253. If it has this one in it you will have a cutting off problem. Gm replaced these with #16198264 The cam sensor magnet on the cam gear will deteriorate and give problems. This will require removal of the timing cover.
Posted on Apr 17, 2009
SOURCE: fuel pump or crank sensor?
First you must find out if its gas or spark. next ime it stops just cycle key off to run ( not start) do it several times and then try to start it if this works you got a bad pump. If it don't work pop the air cleaner and squirt some gas or either in to carb area and see if it starts if so its a bad pump . Crank sensor is a good guess at that point but they cost 75 bucks and if tou buy one you can't return it if thats not your problem. Good luck
Posted on Jul 13, 2009
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