I have a 93 Buick Skylark GS 3300 Engine Series and my car is cranking but not firing. Diagnostic scan turned up a DTC42 code-spark timing error. The spark plugs are not firing. Replaced crankshaft sensor and the ignition module that the coil packs mount to which later I found out when I tested the old module, nothing wrong with it.. Problem still persists. What do I do now? What could be the problem?

SOURCE: 93 Buick Century no spark

check the crankshaft sensor or cam sensor

honeymokey

• 3113 Answers
• Posted on Jul 06, 2009

SOURCE: why is there No Spark in a 1991 Buick Lesabre

ECM would be the next part. Check the number on it . If it has the number 1228253 replace it anyway because they give a cutting off problem. Clean battery cables all three and replace bolts too.

SOURCE: 99 buick regal won't start

Hello, the Regal seems to have that problem. Insert your key in the ignition and turn it but do not turn the car on, make sure you here the fuel pump kick in, then at the end of you r fuel rail there should be a cap, remove it, use a very thin screw driver and push that part in, Be careful it's going to squirt gas, that's a good sign. If it does not, check your fuel filter. And last, if nothing above described works first check your negative wire on your fuel pump, second your injectors, they might be clogged.
Best of luck, God Bless.

Willie
ECSracing Team

honeymokey

• 3113 Answers
• Posted on Oct 03, 2009

SOURCE: 89 buick park avenue changed cam shaft position

Try a ecm

SOURCE: 91 Buick Park Ave won't start

i just came across this problem myself the other day. i have a 91 buick park avenue that sometimes won't start. i checked several things out like cable connections and coil pack etc. etc. come to find out it was the wiring that came off the coil pack and connects to the crank sensor. the wiring that ran over top of the water pump had finally heated up so bad the coating on the wires had melted and when the engine got hot enough the wires would come in contact and send false signals to the computer not letting it start. after the car cools down and the wires contract it would start. so check the wires from the coil pack to the crank sensor to make sure the wires are not melted together.