Question about 1990 Buick Century

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1990 buick century 3.3l engien,no spsrk I replaced ignition (ccci) module,crankshaft position sensor,&power control module (CPU)ohmed out weirs from crank shaft sens ok (no high res or shorts ) I do have 12 volts coming to the ignition mod any help ??? T.I.A DICKCET

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  • dickhazlett Sep 11, 2009

    Tnx for the quick reply..the ck eng light not on, I should have added when car died & would not start, it did start about 1,1/2 hrs later i ran for abt 5min (to charg batt.)shut off came back 2hrs later no start.. Had it towed home (35 mi.) then I replaced said parts ( B4 replaceing CPU I unhooked Batt. thus clearing any scanner code < i think>)I had a scanner hooked & no code showen,( I think cause new CPU) Your point of a CAMSHAFT SENSORis good!! I went to two auto parts stores they dont show one for this eng..Termanl "K" of the egn mod is wired to term. "B" of the crankshaft sens... I'll get my scope from my shop & check for a puls.. where is the CAMSHAFT SENS LOCATED ON THIS 3.3l ENG
    thanks soooo much dick..

  • dickhazlett Sep 15, 2009

    Hi Drallim Thanks for all your input All this checked OK ! took to Mec. shop he founf low ohms on one "FULL INJECTOR" i HAD ALL 6 REPLACED NOW ok again THANKS FOR YOUR HELP DOCK.....

  • dickhazlett Sep 15, 2009

    yES THERE WAS NO SPARK... i TOOK IT TO A SHOP AND WAS TOLD ONE OF THE FULL INJECTORS READ 8 OHMS NOT 16 OHMS AS IT SHOUKD HAVE SO I HAD ALL 6 REPLACED ..... WHAT EVER?? ... IT DOSE RUN NOW VERY WELL!! AGAIN THANK OU FOR YOUR INPUT i AM NOT A MEC. MY BACKGROUND IS ELECTRONICS ( KINDA HURTS MY PRIDE I COULDN'T GET THIS ONE....
    TNX DICK

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The check engine light should be on--rent a scanner, read out the codes, and pursue to repairs. The one sensor you didn't mention is the camshaft sensor. It is a hall effect device and depends on a magnet passing to generate triggers. It is combined with the crankshaft sensor and they work in tandem with the CPU to generate firing. Maybe the magnet came off of the camshaft? If you have access to an oscilloscope, you could look for pulses from both sensors where they go into the ignition module--terminal 'G' for the crank, and terminal 'K' for the cam signal.

Posted on Sep 11, 2009

Testimonial: "tHANKS FOR ALL YOUR HELP ALL THIS CHECKED OK FOUND IT TO BE BAD FULL INJECTOR ...."

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  • drallim Sep 11, 2009

    The check engine light should be on--rent a scanner, read out the codes, and pursue to repairs. The one sensor you didn't mention is the camshaft sensor. It is a hall effect device and depends on a magnet passing to generate triggers. It is combined with the crankshaft sensor and they work in tandem with the CPU to generate firing. Maybe the magnet came off of the camshaft? If you have access to an oscilloscope, you could look for pulses from both sensors where they go into the ignition module--terminal 'G' for the crank, and terminal 'K' for the cam signal.

  • drallim Sep 11, 2009

    The two sensors are combined in one package according to my Haynes manual. The book says that the sensor is located behind the harmonic balancer (part of the crank pulley). Check the interrupter rings on the back of the balancer for damage or bends. Tool # J-37089 is used over the crankshaft to position the sensor, then tighten the sensor mounting bolts. The tool will also check the alignment of the interrupter rings on the balancer. Insert the long post into the balancer and rotate the tool. If the tabs on the tool touch the rings, the rings are bent. This process apparently also aligns the camshaft pickup part of the sensor. Correction on the wire connections (according to the book). Terminal F on igmod goes to D on the sensor (green wire for crank) and terminal K on igmod goes to C on the sensor (blue wire for cam). G on mod goes to B on sens (blk wire) and H on mod goes to A on sens (gry/red). G is shown as ground in the mod and H is shown as 12 volts. Check your wire colors for these connections. Whew!

  • drallim Sep 15, 2009

    A defective injector should have caused a one-cylinder miss. I thought you had a no-spark problem. Well, anyway, I'm glad you have it running well.

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  • Master
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Check to see if the throttle position sensor is stuck in the open position,it may not let it start.

Posted on Sep 12, 2009

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What does acam or crankshaft sensor do


  • The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown.
  • The camshaft position sensor identifies position of the camshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown
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