Question about 1996 Buick Roadmaster

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Engine cranks, but no start

I just came back from deployment on sunday. My 1996 Buick Roadmaster was running like a champ before I left, but since I have been back, the engine cranks, but wont start. Already replaced the plugs, fuel filter, and battery. Fuel pump pressure is good, just no start. Is it the ignition modulator or should I locate and replace the distributor cap?

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It probably doesn't have a distributor, but a distributorless ignition system.
Don't throw money at it. If you want to throw your money away, throw it all at once on a brand new car!
Test, test, test. No mechanic of any stripe or intelligence would ever encourage you to change any ignition component on the car without first doing a little testing. Simply checking for spark at the end of a sparkplug wire and observing the color and intensity of the spark can tell you if you need to wonder about the ignition module, or the crank position sensor, or the cam position sensor, or the pcm. Not trying to be a blow-hard, just encouraging you to diagnose first.
If you are interested, check out this short video on testing for spark with an inexpensive testlight, and the accompanying write-up on ignition systems:
http://www.2carpros.com/articles/how-to-test-an-ignition-system. Welcome back.

Posted on Dec 12, 2012

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First let me say thanks for the effort for our country.
Do you know if the injectors are getting voltage and pulse ground, and if the plugs are getting spark ?
You need to know that to proceed.

Posted on Dec 12, 2012

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SOURCE: 1989 Buick intermitent engine problem Buick Regal

You did'nt say if you have had the car (Scanned) to see if the engine control Module has stored any fault codes. You say it runs 20 miles or so before it quits. After cooling does it alawys start back up? What have you been doing to get it running again? The ECM can warm up and quit. It'll get an Troblem code about though. The no spark at the time sort of removes the Cat converter overheating and the ingtion Module ( (the coils are mounted to it). Something getting too hot is likly. Crank sensers and cam sensers both wil do this the crank senser is on the back of the block just above the oil pan. The cam sewnser is underneath the power steering pump and the connector going to it is on top of the front valve cover on the passenger side. Crank sensers will not code and still be bad. Computers if they come back on ever they will code most any problem and the code name is Quad driver failure.

Posted on Jul 23, 2011

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