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Old 07-13-2011, 01:35 PM   #1
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Question 1991 buick century no spark

no spark or noid-replaced 5 ignition coils,4 crankshaft sensors.injectors are good.replaced ecm.will crank but won't start.we did get it once started and ran for 2 hours but since that time we can't get it to start again.checked all wiring.fuel pressure is low but no spark.
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Old 07-13-2011, 04:08 PM   #2
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I lenghtend your thread title to include more info..Ok so you mean you replaced the coils 5 times? the crank sensor four times?and the ECM once?....Have you checked funtionality of the ICM by chance..
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Old 07-13-2011, 09:56 PM   #3
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OK, what gives you spark. Lets look at you have. You have no spark on any cylinder, so changing the coils is pointless. You have 3 coils right? The ICM controls all the coils, so if the ICM is bad, no spark. The crank sensor tells when to spark, bad crank sensor and no spark. The cam sensor tells where TDC is, bad cam sensor you may still get spark, just not where it should be. A damaged ignition wiring harness. I suggest testing the harness. If that checks out, then look at the ICM
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Old 07-21-2011, 03:32 PM   #4
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this buick century has been here 6 weeks with no such luck.the owner wants to put a new pump and sender in it,he was told by the dealer that buicks have a shut off when the pressure is low.we tried 6 ignition coils and had the car running for 2 hours but then it died and hasn't ran since.Every wire and coil has been tested.We evan tried shipping this out the day but the owner like I said wants to keep changing parts but we're running out of parts to change.The ecm has been changed twice also.
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Old 07-21-2011, 03:39 PM   #5
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What'* the fuel pressure? Should be around 48psi KOEO
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