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No Spark[740-760/86] posted by Kevin Patrick on
Friday, 10 July 1998, at 1:09 p.m.
I am an avid "brickboard" reader but this is my first post. This morning my 86 740 GLE (B230F) started and ran for approx. 30 seconds then died and will not restart. No spark exists at the coil (replaced coil with new one no change). The fuel relay does kick on after taking the ignition switch from start to run indicating the hall sensor is working (according to the archive message I read). This is the first time this has happen and I am at a loss to isolate the cause. I searched the brickboard archive but could not find any helpful information to solve this problem. Any recommendations are appreciated.
Thank you,
Kevin Patrick
Re: No Spark[740-760/86] posted by Rick Ewald on
Friday, 10 July 1998, at 7:44 p.m.
Kevin,
Ok let's go thru a general no start fault trace.
1. When you turn the key on does the pump run for about 1 second? From your post I would assume that the answer is yes. This idicates that the fuel pump runs and the relay and ECM are capable of turning it on.
2. When you put the engine to crank does the pump run during the cranking?
Again you said yes, as you deduced this indicates that the hall switch is working
3. is there spark at the coil itself? (to test pull the coil wire part way out and have someone else crank the engine) If the answer is yes then the problem is in the distributor secondary (cap, rotor, wires) If the answer is no continue.
4. Is there voltage present at the coil low tension terminals with the key on? ( and are all the wires connected?)
If no fix, if yes continue
5. Is the power stage connected? yes? remove the connector and eximine the terminals on both the power stage and connector if they are corroded they will need to be cleaned. Still no start continue.
6. IS THERE ANY GAS IN THE TANK?
7. Are you sure?
Most likely you will find a bad connection at the power stage or at the coil. If after going thru this still no start get back to me and we will go further
--Rick Ewald