OK, it appears that either the power amplifier or the vapor purge latching transistor has failed - so the power module is going to have to be repaired. I think your best bet is to get another power module and swap them out, but save the old one because it can be repaired. I used to repair these but there was not much call for it and I've stored all the equipment I need to do it - and I don't have any plans to get into it again. Maybe someone else in the club with an electronics background will volunteer - I'd be happy to provide some guidance. In the mean time, contact Bob Baker to see if he has any more of the ones we tested/repaired a few years ago. Bob is at baker-michaels@xxxxxxx Your in-tank pump pressure is a bit low, but I think the car should run OK that way - and your gauge could be off that far anyway, unless it is a precision gauge. Dick Benjamin -----Original Message----- From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of ryan walker Sent: Thursday, August 03, 2006 5:36 PM To: mailing-list@xxxxxxxxxxxxxxxx Subject: RE: IML: '81 EFI IMPERIAL won't start Hello! I checked to make sure there was 12-volts at the ASDM, and there was. I bypassed pin 2 & 3, and in-tank fuel pump ran with key on. So I checked the 23 volt power supply, and there was 22.83 at the air flow meter connector, the throttle position sensor, and pin 3 of the power module. I then grounded the fuel pressure switch, and turned the key on. There was no spurt of gas. When I checked the voltage at the control pump, ASDM bypassed, key on, plugged in, I had zero volts. Unplugged I had 4.75 to 5.08 volts. I also checked fuel supply from the in-tank pump, it was 11.5 PSI. With good flow. Thanks everyone for your input. Ryan Walker ---- Original Message ---- From: dickb@xxxxxxxxx To: mailing-list@xxxxxxxxxxxxxxxx Subject: IML: '81 EFI IMPERIAL won't start Date: Tue, 1 Aug 2006 21:38:39 -0700 >OK, that eliminates a whole pile of things. > >First, make sure that 12 volts is getting to the power module as >follows; >bypass the ASDM by putting a temporary wire from pin 2 to pin 3 on >the ASDM >- this will put 12 volts on the power module input and run the >in-tank fuel >pump any time the key is on, regardless of the other logic inputs to >the >ASDM. > >Next, check the 23 volt power supply output. Look on any one of the >following places: The center pin of the air flow meter connector, or >the >pink wire on the throttle position sensor, or pin 3 of the power >module. >There should be 23 volts on the above points. > >Be very sure not to short the 23 volts to ground - that is the most >common >failure point in these cars, and the most easily caused by poking >around the >system. > >If the voltage is not 23 volts within about 1/2 volt or so, your >power >module has failed and we'll have to find you a new one. > >If there is 23 volts at the power module output, turn the key off and >then >short the wire which goes to the fuel pressure switch to ground, then >turn >the key on again momentarily, while you watch the voltage on the >control >fuel pump input - you should see a momentary surge of 12 volts or so >on that >point, and there should be a spurt of gas from the nozzles. > >If there is a momentary surge of 12 volts on the control fuel pump, >but >still no gas at the nozzles, we need to check the fuel pressure at >the >control fuel pump inlet. It should be 13 PSI, within 1/2 PSI or so. >The >easy place to check this is at the filter outlet under the car, just >under >the passenger door hinge post. > >If there is still no drive to the control fuel pump, we'll have to >investigate the power module amplifier function and the logic which >controls >it, but let's not get too far ahead of the story. > >Dick Benjamin > >-----Original Message----- >From: mailing-list-owner@xxxxxxxxxxxxxxxx >[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of ryan walker >Sent: Tuesday, August 01, 2006 5:23 PM >To: mailing-list@xxxxxxxxxxxxxxxx >Subject: IML: Info on '81 EFI IMPERIAL > >The info on this car is, that I reinstalled the air cleaner, the car >would just crank. I took the air cleaner lid off, poured a little >gas down the throttle plates, put lid back on, car started, ran for a >second, and died. So it seems the problem is lack of fuel. >Any and all suggestions are welcome and greatly appreciated. > >Thank you, >Ryan Walker > > > > >----------------- http://www.imperialclub.com ----------------- >This message was sent to you by the Imperial Mailing List. Please >reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be >shared with everyone. Private messages (and attachments) for the >Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx >To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm > ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm