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#1
06-26-2022, 10:45 AM
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02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded
02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded put out fire fast
not making sense here first off car showed no codes at all then code P0171 and P0171 pending kept showing so replaced a few things that thought was code related then codes show up then boom intake manifold explodes lucky put out fire fast P1689 BUICK Code - Traction Control Delivered Torque Output Circuit P1575 BUICK Code what is this? location of where to look for ? Extended Travel Brake Switch Circuit ? P1133 BUICK Code O2 Sensor P0171 Buick Code -------------------------- All I have Replaced ---- Oxygen (O2) Sensors Fuel Injector Connector Intake Manifold Fuel Line / Hose Fuel Injectors Spark Plugs and wires Air Intake / Charge Temperature Sensor MAF Sensor new Fuel Rail also did a smoke test small leak but fixed Fuel Line / Hose replaced and a couple other things replaced any ideas what I should look at from here someone said fuel pressure regulator ? bad O2 sensor even though new ? Timing Chain any help at all is deeply appreciated Thanks 
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#2
06-26-2022, 05:31 PM
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Re: 02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded
The harmonic balancer could have slipped around the hub, also crank and or cam sensor can be be bad. Google the other codes, plenty of info out there.
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#3
06-27-2022, 10:14 PM
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Re: 02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded
As Max alluded, the two are related. The crank position sensors (multiple) are behind the balancer on a '92, or at least are from my recollection.
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#4
07-01-2022, 08:51 AM
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Re: 02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded
Well sorry for the late response
did a compression test 1 rear cylinder is dead, 1 very week other 4 are strong now do I junk it get a junk yard engine or get 1 from autozone or advanced discount auto which I really don't care for figure just had the tranny redone Thanks for the advice did put a new camshaft sensor in was going to put the crank shaft sensor in side note has any one bought a engine from autozone and if so is it worth it and how complete are they don't think its safe enough to drive with 4 cylinders?
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#5
07-01-2022, 08:58 AM
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Re: 02 Buick Lesabre Custom occasional hard start, backfires occasionally, manifold exploded
Is the low compression due to bore/ring wear, valves, or something else? It is possible the block and rotating assembly are serviceable and a valve is bent, stuck, or not opening.
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