97 Safari turns over but won't start - ignition coil wires?

[icemuncher99]

We have had an ongoing problem - Safari will turn over but not start. If we leave it sitting for about 1/2 hour it will usually start. The odd time (like today) it will not start and the battery will run low. Usually we can charge the battery and then it will start again. Could this be a problem with the ignition coil wires? I called GMC and they said there was a recall in 98 regarding the ignition coil. I am trying to figure out in advance if this is the problem as they will charge us for any other work that needs to be done. Could this be a timing problem as well?

[Blue Bowtie]

Welcome Aboard!

This engine is very sensitive to fuel pressure. The standing pressure must be 61 PSIG to start reliably, although some will start as low as 58 PSIG. The fuel pumps are also very sensitive to voltage. A one volt drop can result in fuel pressure that is 5-7 pounds lower. As a result, connections are very important, including grounds. If you can jump the battery to increase voltage while cranking and the vehicle starts reliably there may be a low voltage problem.

If the fuel pressure is adequate the problem may be with a failing coil or ICM.

[icemuncher99]

Originally Posted by Blue Bowtie

Welcome Aboard!

This engine is very sensitive to fuel pressure. The standing pressure must be 61 PSIG to start reliably, although some will start as low as 58 PSIG. The fuel pumps are also very sensitive to voltage. A one volt drop can result in fuel pressure that is 5-7 pounds lower. As a result, connections are very important, including grounds. If you can jump the battery to increase voltage while cranking and the vehicle starts reliably there may be a low voltage problem.

If the fuel pressure is adequate the problem may be with a failing coil or ICM.

Hi Blue Bowtie,

Thanks for your reply. Would the low voltage problem allow the van to start without a jump? Sometimes it won't start but once we let it sit for a while it starts with no jump.

[ceevester]

Hi. I'm certainly NO expert, but I've seen this problem more than once, and it was a hairline crack in the ignition coil.

The coil may test good, but the spark leaks out through a crack and keeps the engine from starting.

Try spraying a fine mist of water over the coil ....from a water bottle....while cranking the engine over....bet you see a spark leaking out of the coil.....

It's easier....and a lot cheaper....than most of the other possibilities....give it a try....

Good luck!