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Discussion Starter · #1 ·
OK, have a 97 ford taurus GL. Now, we bought this car for my daughter, long story short, scanner is giving us cylinder 2 and 6 misfire. Anyways, replaced plugs and wires, put new throttle postion sensor in it. Still nothing. Car has hardly any go. When you come to a stop, and then have to go, no power. Anyways, smells very gassy, and last night disconnected the #6 cylinder, connected noid light up to it, when turned on it flashes a couple of times but then quits unlike the normal cylinder that send a pulse.
What could this be, we ordered a new computer for it, because leaning towards it being bad. Plus, this is a CA emissions car, and finding the computer was hard and had to get one sent from CA.

Any suggestions. Other then lack of power and the missing, its a good car. Wondering if there is a way to make sure its the EMC and not something else.

Thanks
 

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Welcome to TCCA.

Do you have a CEL/SES trouble light lit???? If so, run this puppy by your favorite autoparts store for a no cost computer trouble code scan & post All the code Numbers found, as they can offer up good trouble shooting clues.
 

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Are 2 and 6 sister cylinders on the waste spark coil?

The noid light ceasing to pulse may be normal if the PCM sees misfires from 2 and 6. It will kill fuel delivery to misfiring cylinders.
 

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Add On Spark

Are 2 and 6 sister cylinders on the waste spark coil?

The noid light ceasing to pulse may be normal if the PCM sees misfires from 2 and 6. It will kill fuel delivery to misfiring cylinders.
Good info to add to our list of "how it works".

If the system lost 2 spark cylinders, and it kept on squitring gas in them, then the O2 would be so rich it would cut back the fuel and the engine would quit, or the excess would overheat the cat.

I remember, on a F-150 with inline 6, open plug wire, it would start and run fine until high rpm and heavy load. Then it would miss, followed by an apparent loss of power, like running out of fuel. Makes sense. Have 2 cylinders out and hard to tell how bad it would be if it kept on shooting fuel.

Good call.

-chart-
 

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What do you mean "tested the coil"? Resistance tests mean almost nothing, as those tests dont check the coil under operating (high voltage) conditions. Even without cracks, coil could still be bad. Maybe grab 1 or 2 from the JY and try them.
 

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How long ago did you buy it and what was the previous maintenance like?

First thing to do would be to pull the spark plugs, not immediately buy parts that might not be the culprit, especially parts as expensive as a computer.

Take a look at the spark plugs and see what condition they're in, they might be junked. Also look at the wires, they may be arcing somewhere. It's also entirely possible somebody mixed up the #2 & #6 wires on the coil pack, so trace the wires and make sure they're on the right coil.

Another thing to check for is if the car is running lean. I had a lean problem, and under acceleration, it would go VERY lean and start missing. I'd look into the MAF cleaning procedure. It wouldn't hurt.

If you have the means to do a compression test, you could see if it's a more serious, mechanical issue with the heads or the piston rings.

Fingers crossed it's nothing too serious.
 

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Discussion Starter · #8 ·
Compression is fine, replaced plugs and wires just this last weekend. Will go and hook my scanner up and get the code # again forgot what they where. Computer was really not that expensive at 36.00 so thought about trying it. 2 and 6 are on the same coil and coil was also replaced sense I had about 4 sitting around already. With having owned quit a few of these and have bought ones with either bad motor or Tranny seem to get alot of spare parts from them. This tho throws us for a loop. But, actually that makes sense about the cylinder not sparking if computer detects misfire. Car has not died at all so far, runs rough and no power. Convertor am not sure about yet.
 

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Go to AZ or Advance and read the codes then swap coil

Had misfires on 1 and 3 plus rough idling. Did PCV (a bitch on a Duratec), Coil, and finally IAC valve. Idling was probably IAC but misfires probably coil. Old coil LOOKS fine, no visible cracks or arc marks but unless you are Marilyn Monroe looks aren't everything.
 

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Have you run a compression test?
 

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Have you run a compression test?
Yeah I was thinking the same thing. If you've got fuel, compression and spark it has to fire. However, if someone has overheated the engine you may have a couple of cylinders low on compression.

Verify compression on number 2 and 6 cylinders. If low (around 120psi or lower) then verify if it is piston rings or head gasket or valves. Either way you'll be turning wrenches.

Monsoon.
 

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Discussion Starter · #12 ·
Well, it was the PCM. Got new one today, put it in and all works great. AC works without having to be jumped over, no more misfire and tranny shifts like a dream.
We had ran the wires and checked the wires and they where no interuptions in signal, so after looking it over the computer was the last thing.
Works great and after talking to Ford, PCM's going bad is a commen issue in these years of taurus.
There was even a sticker on this car where in 2001 the PCM had been reflashed, so that was actually what made us lean more to the PCM being bad.
 

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Good find, fix, feedback & to hear you got it squared away & are "on the road again"!!!!
 
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