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  1. My 97 Deville, with 169,000 miles, was running real rough the other day and I thought it was about out of gas, but after putting gas in it, it still would not start. About a couple weeks ago the fuel gauge went spastic and would jump around between full & empty even when I knew it had at least 1/2 tank of gas. I read some posts that said to put some techtron in to clean the sending unit contacts. After adding that things got worse gauge wise. It now will not start like it has no fuel pressure or spark. I am pretty sure spark is o.k. because it hits sometimes. The following codes are showing. B0533 - Fuel Level sensor shorted to battery - Current B1558 - PZM EEPROM Checksum error - History B1971 - Inadvertant Power Malfunction - History B2750 - Pass -key Data Communication Failure - Current (Key chip is getting warn) I replaced the fuel pump with an a new AC pump about 3 years ago. I have not been able to get my fuel pressure gauge on it yet. Right now I have 2 vehicles down with possible fuel pump problems and it is driving me crazy. After going through the codes I am not ruling out that maybe the PZM is causing the problem. I am going to uncover it and check the contacts and maybe tap it and see if there is a change. Right now money is tight and I do not want to just throw parts at it. I did replace the fuel filter before I changed the pump the last time. I might start there also. I will report back when I get the fuel pressure gauge on it. Any other suggestions?
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