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Old 02-25-2011, 11:08   #1 (permalink)
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96 Taurus DOHC misfires, low oil pressure

I am posting because I'm actually having trouble finding a trustworthy mechanic who wants to look at my car. It seems mechanics who are equipped to do diagnostic work are in short supply in Milwaukee.

I have a well maintained 96 Taurus 24v 3L DOHC. About two months ago I received an intermittent low oil pressure light. The oil was not especially low but I added some, just in case. I took the car into my regular shop, and they said there was nothing wrong it. I have monitored the oil level, and it is normal.

About three weeks ago I was coming to a red light and braked as normal. I put the car in park to fiddle around with something, and when the light turned green, I couldn't depress my brake to put it into drive again - the brake pedal was stuck in the up position. So, I turned the car off and back on again, and it struggled to start a bit, which was unusual.

I didn't think much of these oddities, so I got on the freeway. Five miles later, as I am exiting the freeway, my CEL begins to blink and my low oil pressure light comes on. There was very obvious shaking and the vehicle struggled, but I was in a rough stretch of town at night with no phone, so I pushed ahead another mile to my regular shop. There was a lot of engine noise - possibly from the valve train, but I'm not an expert. My battery light was also on by the time I got to the shop, which I guess is from reduced engine power.

My shop calls be back to tell me that I have a p0303, and that their opinion is the car isn't even worth further diagnosis - with the combination of engine noise, low oil pressure light, and misfire, the engine must be dead.

I took the car back - I drove it a block to store it off their property (it still starts and runs, although it has a lot of trouble starting, which is new with this most recent problem). The battery light has not come back but the other two lights remain. I borrowed a friend's cheapo code reader and it gave me p0303 and p0305. I don't know if my shop lied, but whatever the case, now I have misfires in the 3rd and 5th cylinders.

Can anyone advise on my next step? Does a low oil pressure light and misfire codes indicate a dead engine 100% of the time? Is the lack of vacuum to my brakes five miles before this happened a clue?

I don't want to give a shop $300 for diagnosis when they start out being convinced that I need a new engine. I have done some research, and I'm thinking about trying to get a vacuum gauge and hooking it up to the hose that runs from my engine to my brake booster - as I understand it, a bouncing needle would indicate a valve problem. Any problem that requires removing the engine probably means I need a new car.

Please advise.

Thanks,
John
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Old 02-26-2011, 17:51   #2 (permalink)
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Re: 96 Taurus DOHC misfires, low oil pressure

Quote:
Originally Posted by John96Taurus View Post
I am posting because I'm actually having trouble finding a trustworthy mechanic who wants to look at my car. It seems mechanics who are equipped to do diagnostic work are in short supply in Milwaukee.

I have a well maintained 96 Taurus 24v 3L DOHC. About two months ago I received an intermittent low oil pressure light. The oil was not especially low but I added some, just in case. I took the car into my regular shop, and they said there was nothing wrong it. I have monitored the oil level, and it is normal.

About three weeks ago I was coming to a red light and braked as normal. I put the car in park to fiddle around with something, and when the light turned green, I couldn't depress my brake to put it into drive again - the brake pedal was stuck in the up position. So, I turned the car off and back on again, and it struggled to start a bit, which was unusual.

I didn't think much of these oddities, so I got on the freeway. Five miles later, as I am exiting the freeway, my CEL begins to blink and my low oil pressure light comes on. There was very obvious shaking and the vehicle struggled, but I was in a rough stretch of town at night with no phone, so I pushed ahead another mile to my regular shop. There was a lot of engine noise - possibly from the valve train, but I'm not an expert. My battery light was also on by the time I got to the shop, which I guess is from reduced engine power.

My shop calls be back to tell me that I have a p0303, and that their opinion is the car isn't even worth further diagnosis - with the combination of engine noise, low oil pressure light, and misfire, the engine must be dead.

I took the car back - I drove it a block to store it off their property (it still starts and runs, although it has a lot of trouble starting, which is new with this most recent problem). The battery light has not come back but the other two lights remain. I borrowed a friend's cheapo code reader and it gave me p0303 and p0305. I don't know if my shop lied, but whatever the case, now I have misfires in the 3rd and 5th cylinders.

Can anyone advise on my next step? Does a low oil pressure light and misfire codes indicate a dead engine 100% of the time? Is the lack of vacuum to my brakes five miles before this happened a clue?

I don't want to give a shop $300 for diagnosis when they start out being convinced that I need a new engine. I have done some research, and I'm thinking about trying to get a vacuum gauge and hooking it up to the hose that runs from my engine to my brake booster - as I understand it, a bouncing needle would indicate a valve problem. Any problem that requires removing the engine probably means I need a new car.

Please advise.

Thanks,
John
Hello and good day from Green Bay:

Ok...Do you know the Engine Type, and Size?

Ford Mondeo V6 engine - Wikipedia, the free encyclopedia

If it's a DOHC its most likely a 3.0L V6 24v Duratec.

Any way you may want to take it to Autozone, or Advance Auto to have them re Check the OBDII Codes.

I would lean towards to Coil Pack as the Misfire I would replace it soon.

The low pressure could be a multitude of Problems...Vac Hose Leaks...PCV...Oil Pump...Leaking Oil Gasket on Pan..Head..

Lets start with the Basics...Get a Oil Change and a Good Filter. Have a Compression test done on the Cylinders. etc.


1996Ford Taurus3.0LVIN "1 or 2" OHV Vulcan, Flex Fuel1996Ford Taurus3.0LVIN "U or 4" OHV Vulcan1996Ford Taurus3.0LVIN "S" DOHC Duratec1996Ford Taurus SHO3.4LVIN "N" SHO
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Old 02-26-2011, 18:44   #3 (permalink)
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Re: 96 Taurus DOHC misfires, low oil pressure

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