96 LSS wont start, fuel pump relay clicking rapidly - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-05-2008, 08:34 PM   #1
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Default 96 LSS wont start, fuel pump relay clicking rapidly

Hello all,
Just had a problem the other night, the engine cranks but wont start! With the ignition on, there is a rapid clicking of the fuel pump relay. I can also hear the fuel pump pulsing along with the relay. I jumped the relay terminals (3 and 5 if I remember correctly) on the panel and the fuel pump seems to run normal. However, the engine still wont start with the jumper in place. I swapped the relay with an identical part# with no fix. Only other problem I noticed was the climate control display is flashing. I havn't checked the wire harnesses near the kick panels yet. I will get to the car later on tonight, just looking for more hints before I head out. I did a search but didn't find anything with exactally the same symptoms. I can tell you that the power windows DO work. One other check I made was I pulled the fuel pump module connector with the ignition on. The fuel pump ceased to pulse, then continued once reconnected. Hhhhhmmmmm.......
I am contemplating on buying a scanner tonight, what do you guys think?
Thanks for all your help,
JJ
Important note- I am not 100% positive it is the fuel pump relay that I have been messing with. I dont have an owners manual, and my chiltons doesn't show my type of relay/fuse panel. This panel is the one on the passenger side, under the dash. It acted up this way intermittantly months ago, but fixed itself after I turned off the ignition then back on. Hasn't done it since. Well, till yesterday......
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Old 02-05-2008, 11:28 PM   #2
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Default

The 1st thing to check is for corrosion on the battery cables. Remove the rubber boots from the cable ends & clean with sandpaper or wire brush. Apply dielectric grease to help prevent future corrosion & reassemble.

If that doesn't help then remove the relay & look for numbers near the relay terminals. You should see 85, 86, 87 & 30. You need to check for power where terminals 85 (power from PCM) & terminal 86 (ground) plug in. Positive meter lead goes to the socket for terminal 85 & negative lead goes to socket for terminal 86. You should have 12 volts for 2 seconds when the key is in the on position. Should have a constant 12 volts while cranking.
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Old 02-06-2008, 12:51 AM   #3
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Default Car started, left wire harness

I made it to the car tonight, first thing I did was wiggle the left kick panel wire harness and it started right up. Coincidence? I will try tomorrow to recreate the failure, then see what we have. Ted, thanks for the numbers, I will check them out. Can you help me identify all the fuses/relays in that panel? Again, I dont know for sure if thats the fuel pump relay, but the pump stops running when I pull it. As you are looking at the panel, it is the only one in the left vertical row. I will also check the battery terminals, although I recently checked them out with a PO171 problem. Thaknks,
JJ
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