Stock d16z6 fuel pump will prime but will not stay running replaced the pump a few days ago car ran fine all weekend now will prime start and die if I keep the key in the cranking position it will run until released to run any ideas?

 

Sounds like the capacitors in the ECU that control the fuel pump priming circuit are starting to fail. Time, heat and humidity will cause a intermittent fuel pump priming failure until they eventually totally fail. Borrow a known good ECU and swap it out. These ECUs are now over 20 years old. Common problem.

Junkyard about $125.

You could check the main relay solder joints and the ground connection at the thermostat housing but my guess is ECU.

 

I have a spare Ecu I'll swap in after work thanks

 

this does not sound like an ecu issue, given as it stays running with the key turned. id lean toward checking your key tumbler/ignition switch.

 

Yep, sounds like bad ignition switch. The electrical switch can be replaced.

 

X2

 

Happened to me when I didn't know much about cars, I replaced both and have not had an issue in 15 years. There are testing procedures in the FSM if you want to trouble shoot it properly.

 

I haven't had time to mess with it since but yesterday it started up ran fine but after stopping and starting a few time while playing with the key it started acting up again.

Any suggested write ups on replacing it?

 

There should be a diagram in the FAQs sticky for testing the ignition switch.

You should be able to buy the electrical part of the ignition switch on eBay. In the past, I've seen it for about $50.

 

is this your key ring? if so get it down to one or two if possible.

 

Lmao nope not me only car key house key and garage key I hate when people have a million keys on their lanyard