Car Stalling after disconnecting battery
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Old August 31st, 2008, 12:24 AM   #1
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Car Stalling after disconnecting battery


I have an 87 Mustang GT, just purchased a few weeks ago. It had a big autometer tachometer I was not a fan of so I decided to take it out. I disconected the battery and due to the way it was wired I had to take the gauge cluster out. While I had it apart I decied to clean it up a bit so I took off the plastic cover of the intrument panel and cleaned all of the gauge cluster which was a mess, in the process I did hit the oil pressue needle by accident, but it dropped back down to where it was before I hit it. I took out the wiring for the autometer tachometer, and re-connected the stock wiring where it was spliced for the autometer tachometer (one wire was spliced into a crane cam ignition coil).

I put everything back together and took it out for a drive. Drove for about 10 min and everything was fine. On my way back home coming to a stop, the oil pressure gauge drops down to almost 0, the amp light comes on, the low coolant light comes on, and check engine light comes on, then the car stalls. Start it back up and the oil pressure is reading very low. Same thing happens coming to the next stop sign except I kept it from stalling. Get it back home in the garage and shut it down. I check things out, disconnectd the oil pressure sending unit and connect it again and start the car up again. The idle is all over the place, surging up and down almost stalling each time. The oil pressure reads in the middle but also drops up and down with the idle.

I know the car has to 're-learn' after the battery is disconected but I had disconnected it before to install a stereo and had no issues after starting it up again. What are your toughts on the oild pressure, is it just to gauge or could I have an oil pressure issue? Is there anything else that would need to be done to re-set the idle after disconecting the battery? I do have underdrive pullies. My biggest fear is the oil pressure, any easy way to accurately check this? The engine was just rebuilt 5000km ago.
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Old August 31st, 2008, 09:32 AM   #2
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I would go back and checks all the wires where you spliced back together. If the car was fine before you did this work then it's most likely something you worked on. It sounds like you have a loose ground or loose wire. Check all the wires you reconnected.
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Old August 31st, 2008, 11:41 AM   #3
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Ya, I will give that a try and see what happens. There is only one wire I had to re-connect that would have anything to do with the idle and voltage problems I am now having.
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Old August 31st, 2008, 01:18 PM   #4
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I checked all the connections and then let the car idle for 20min. Problems seem to be gone yet. Is there any step by step guide on how to install a better oil pressure gauge, the stock one is crap.
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Old August 31st, 2008, 06:04 PM   #5
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when you disconnect your batter when its running your spiking your computer i wouldnt do that...... oh and as far as it not running its your altinator....
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Old August 31st, 2008, 06:16 PM   #6
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My last post should have read "I checked all the connections and then let the car idle for 20min. Idle problem seems to be gone now. Is there any step by step guide on how to install a better oil pressure gauge, the stock one is crap." My train of thought was somewhere else when I was typing.....

I never had disconnected the battery while the car is running, just disconnected it waited for 10 min, and connected it again to clear anything that may have been causing the idle problem. I had no issues with it before I disconnected the battery, so I doubt it is the alternator. It was at night with all the accessories on, coming to a stop, combine that with underdrive pullies and a bad idle and I think that was my issue. Just starting to learn the 'quirks' in the car as I only have had it for a few weeks.
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Old August 31st, 2008, 06:18 PM   #7
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ok so im still lost on what its doing just idoling rough
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Old August 31st, 2008, 06:42 PM   #8
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Idle problem is gone now which was the cause of the car stalling, but the other part of my post was the oil pressure gauge as it is all over the place. Checking through the posts this seems to be a common issue with the stock gauge but just want to rule out an oil pressure issue. I am looking for a step by step how to, on how to attach a mechanical oil pressure gauge.
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Old September 1st, 2008, 08:37 AM   #9
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It just hit me like a ton of bricks. I had the same problem you had before. Look at your ground cable on the battery. There are 2 small ground wire that splices into it. Make sure it is not loose or broken. My was bad and I had the same problems your talking about. My dash lights would go dim, alt light would come on headlights were dim also.
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Old September 1st, 2008, 09:10 AM   #10
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Thanks. I did check that out and tightened everything down. Just seems to be my oil pressure gauge now that is reading all over the place, I think I will try replacing the sending unit.
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