2000 Grand Marquis PROBLEM!!! HELP!!

[soldnottold03]

I have a 2000 Grand Marquis which i purchased from carmax with 87000 miles on it. I now have added 5000 miles to it and have noticed a very weird problem that happens here and there. The problem is this.....the voltage meter to the left of the cars tachometer sometimes when i go to start it up will rise to a normal position and then right when i think the car is started it completely drops and the car shuts down and the check engine and battery light both light up on the dash. This happens probably once a week and i cannot figure out what the hell it is. I have taken it back to carmax and they have "said" they didnt know either so if anyone out there knows what could possibly be the cause for this mysterious loss of power throughout my engine on a start up please help im all ears.


P.S.

at night when i turn on my lights the voltage meter will drop suddenly or if i roll my windows down it will drop suddenly as well. To me it sounds like an electrical problem somewhere, where i dont know. I have tested my batter and it came up with a strong reading of 14vdc other than that i dont know what else to do. opcorn:

[GrandMarquis_2000]

We had the same problem. It progressively got so bad the car engine wouldnt start at times, and it would idle *very* rough. We brought it to this mechanic and he fixed just fine by resetting the onboard computer. He was preplexed, we were preplexed but its been an year and a Canadian winter since then and we've had no problems.

About the voltage meter, the voltage drops before the car shuts down simply because the engine's revs go to zero. The voltage dip whenever you use an electrical device is due to the finite amount of current the alternator can provide.

Of note, when you lower the windows the voltage dips. But when the windows are fully lowered (or raised), the voltage drops even more. Stalled electric motors draw more current, so this is expected. The car design should not allow the motor to stall... but alas the electricals in the Gran Marquis are of fairly poor design.

[2000mgm]

i have the same problem with mine too.

[way2old]

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