I can drive my 91 xj for about 10-15 minutes and the suddenly it will just shut down. When i try and restart it, it cranks and cranks but will not fire. I swapped out the ASD relay with the AC relay and it fires right back up. What causes the ASD relay to keep failing?

 

so i went outside, swapped the relay back into AC and ASD back to the original relay (i thought was blown) and it started? So this means that the relay isn't tripping, something else is, even though it can be remedied with a new relay?

 

could possibly be he connection in the fuse block itself. how easy does the relay pull out? should take a little force

 

yeah its in there good. i just drove her around for probably 20 minutes fine, parked it, shut it off, now it wont start again. Id bet money if i went and changed the relay it would fire right up though...

 

try that and see what it does, have you bought a new relay for it yet or have you just been swapping them?

 

started up first try on the same relay it just stalled on? Its like it needs resting time before it wants to start back up?

 

Try tapping on the PCM lightly and see if it stalls out

 

wouldnt fire up at all. fuel pump didnt prime, turned over but shuddered really badly before stalling out. Went to jump the fuel pump relay and it didnt turn on?

where is the fuel pump grounded? Because i jumped it this morning and the pump ran fine.

 

http://www.rockauto.com/catalog/moreinfo.php?pk=2746438

anyone familiar with this pump?

or this one?

 

I'll look at the fp ground in a min. I'm not sure where they are grounded. And haven't heard much about those pumps

 

went out and shunted the fuel pump relay again, this time it ran fine. I swear this pump has a mind of its own, sometimes it runs, sometimes it doesn't. I still think the Auto shutdown may have something to do with it.

 

The asd could have something to do with it but it's also PCM controlled and Chrysler has had a long history of PCM problems

 

does that mean buying a whole new ecu? those are like $200?

 

Yea, but thats if that's the main cause of the problem

 

where do you suggest i go for the next step diagnostic wise?