717samjr

Have a '94 jeep grand Cherokee limited. When I turn the ignition on it goes a few minutes till the fuel pump comes. What might be the cause? I switched the pump relay with another one and it didn't make difference, so I figure the relay is still good.

jnicewan

I was going suggest starting with the relay but you already did, but you might also try swapping the ASD with another one too.

717samjr

Thanks I can try that, although I'm sorry idk what the ASD is?

dave1123

It's the Auto Shut Down relay. It's in the power box under the hood.

717samjr

Ok thank you!!

FAlfani81

It could be a few lazy caps in the PCM.

717samjr

Checked both relays. Not them. The wait is getting longer. The security light comes on and stays on for a while before the pump comes on

717samjr

Disconnected the security in the dash, still a pause before fuel pump comes on its worse when it's cold

FAlfani81

I don't mean relays. I mean capacitors in the computer. You might need another computer. That's exactly what mine did and it turned out to be computer. It can be fixed if you can solder. If you open the comp you'll see 3 large caps on the main board. Those are known to go bad. The delay is the cap taking a long time to fill up.

dave1123

Why are so many problems related to bad solder connections on circuit boards in jeeps? I know these are wave soldered in production, but is it the new lead free solder or are these made in China?

FAlfani81

This one isn't because of bad solder connections. The caps themselves need to be replaced with new ones.

But I know what you mean! Mid 90s vehicles have a lot of stupid electrical issues because the parts were made like crap. They cheaped out on all the fancy things that were supposed to be taking the auto industry into the "future"

dave1123

If the caps need to be replaced, I agree with you. This is something I could do because of my old radio bashing, but I don't think the average backyard mechanic could do it easily, especialy if he has to drive it the next day. Replacing the PCM isn't a plug and play thing, is it?

FAlfani81

On these Jeeps it is.

And hey, if you can solder go for it! The hardest part of this job is getting the silicone off without damaging anything else. You can pick up the new caps for it at Radio Shack.

FAlfani81

Here's a link to a write up for it.

http://www.jeepforum.com/forum/f13/f...riteup-501951/

717samjr

Thanks to all. The jeep doesn't start at all now. I changed the caps, still nothing. I checked and there's no pressure on the fuel rail, but I can bypass the fuel pump relay and the pump runs. Also I'm not getting spark, tested the coil there's power to it and according to the ohm test it appears to be good. Any help please?