Check engine light no codes!

[SHO GANG]

I have a major issue, after driving my 94 SHO the cars check engine light turns on but when I turn it off light comes off. In park it's fine but as I start to drive it the car feels like it jerks or stutters back and Forth like maybe theirs too much fuel or like it's getting flooded or even not enough spark but it has new spark plugs and wires new fuel filter, air filter I also had a mechanic take a look and he checked it thoroughly and found nothing wrong with any sensors like the MAF, TPS, ICV he also checked the throttle body but that was clean too. Car has 72k miles. He checked it with the scanner but no codes show up but what he did say is that he thought it could be a bad catalytic converter that's really plugged up. Before I got the plugs changed all were filled with motor oil because the rubber seals were so worn but now it's good but I still have that issue. About 3 different mechanics have looked at it but cannot define the issue and they cannot guarantee the parts they will replace will actually solve the problem. I was even told by a fourth mechanic he thought it was an electrical issue but again he was not sure. I really don't got cash to be dumping on parts that they don't even know if it will solve the issue and scanners and jumping ecs test plug wires won't work. Any help will be really appreciated

 

[luigisho]

check engine light typically fires off a code. If you cannot pull codes from the car there is something wrong with the computer. Get an Innova ford OBI code reader and take guesswork out of it. IF you need to see if the car is reading codes run the car with the MAF unplugged. That should fire an easy code and see if it is readable from pcm. If the car is bucking and such if the car then runs smoother but low on power with the MAF unplugged then you found the issue. Could be a cat. Could be alot of things. Make sure you can pull your own codes and eliminate things. Make sure the spark plug wires are routed from the coil pack correctly

Innova Ford OBD1 Code Reader

Shop for Innova Ford OBD1 Code Reader with confidence at AutoZone.com. Parts are just part of what we do. Get yours online today and pick up in store.

www.autozone.com

Amazon.com

 

[SHO GANG]

check engine light typically fires off a code. If you cannot pull codes from the car there is something wrong with the computer. Get an Innova ford OBI code reader and take guesswork out of it. IF you need to see if the car is reading codes run the car with the MAF unplugged. That should fire an easy code and see if it is readable from pcm. If the car is bucking and such if the car then runs smoother but low on power with the MAF unplugged then you found the issue. Could be a cat. Could be alot of things. Make sure you can pull your own codes and eliminate things. Make sure the spark plug wires are routed from the coil pack correctly

Innova Ford OBD1 Code Reader

Shop for Innova Ford OBD1 Code Reader with confidence at AutoZone.com. Parts are just part of what we do. Get yours online today and pick up in store.

www.autozone.com

Amazon.com

First off thanks for getting back to me. Now if it is the computer could any computer from any other Taurus in those years do or dies it need to be a sho 94 ECM

 

[zoomlater]

ECU computers are usually different between years and whether your car is an automatic or manual transmission. As Luigisho mentioned, check the order of your spark plugs. Did the car run okay before the spark plugs and wires were replaced? What brand of wires and plugs were installed?

PCM ECU Computer (Used) ( 89-95 ; 96-99 ) V6 / V8

SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the main computer for your car and controls practically everything in the car. SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the...

shosource.com

2 and 6 misfires

Asking for a friend ;) So I’m interested in throwing my hat into the Gen 2 arena. Considering purchasing a ‘93. It has almost no miles on the engine post rebuild because it started to run bad soon after the current owner got it back. This all took place in 2018. The car has been in and out of...

shoforum.com

 

[zoomlater]

 

[luigisho]

So if the pcm is not functioning you can use a replacement from almost any manual to manual tran s car or any auto to auto car. Exceptions exist with old emissions pcms for California cars. That is for cars built specifically to be originally sold in Cali. You can have a car from elsewhere that was at one time from somewhere else. You can tell by the code on the sticker on the pcm. This is seen from lowering the glove box and look at the back

Credit to shosource:
MTX - 89 - #B9B (CA #B9C )

MTX - 90 - #B9B1 (CA #B9C1*)

MTX - 91 - #L0S (CA #W0Z )

MTX - (92-95) -#X2J (CA #W2Z )

----------

ATX - 93 - #H3Z or H3Z2

ATX - (94-95) - #D4U1

 

[SHOdded]

could a moderator please move this to the right subforum? tia.

 

[SHO GANG]

ECU computers are usually different between years and whether your car is an automatic or manual transmission. As Luigisho mentioned, check the order of your spark plugs. Did the car run okay before the spark plugs and wires were replaced? What brand of wires and plugs were installed?

PCM ECU Computer (Used) ( 89-95 ; 96-99 ) V6 / V8

SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the main computer for your car and controls practically everything in the car. SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the...

shosource.com

2 and 6 misfires

Asking for a friend ;) So I’m interested in throwing my hat into the Gen 2 arena. Considering purchasing a ‘93. It has almost no miles on the engine post rebuild because it started to run bad soon after the current owner got it back. This all took place in 2018. The car has been in and out of...

shoforum.com

1st off thanks again for the reply . I put in new ngk wires and acdelco plugs, ok so the issues was when I put it back together a vacuum line was being pinched that goes to the intake manifold but the check engine light kept coming on so I took it to a local shop and they found that my fuel pressure regulator was not working correctly. My fuel pressure was at 85lbs when it should be less than half of that and they also said that it was not throwing a code because since its vacuum operated it wasn't reading it or something along them lines. I ordered the part but with like every other part that's hard to get I need to wait a week for a new fpr. He also mentioned that he has not seen a vacuum FPR fail like this one. Idk . But I'll keep posting after I get it in.

 

[zoomlater]

1st off thanks again for the reply . I put in new ngk wires and acdelco plugs, ok so the issues was when I put it back together a vacuum line was being pinched that goes to the intake manifold but the check engine light kept coming on so I took it to a local shop and they found that my fuel pressure regulator was not working correctly. My fuel pressure was at 85lbs when it should be less than half of that and they also said that it was not throwing a code because since its vacuum operated it wasn't reading it or something along them lines. I ordered the part but with like every other part that's hard to get I need to wait a week for a new fpr. He also mentioned that he has not seen a vacuum FPR fail like this one. Idk . But I'll keep posting after I get it in.

One of my SHO's had a bog/stumble around 1500 rpm, but would go away after you were going at higher rpm and speed. No codes. Found my pressure regulator was reading in the 80psi range similar to what you found. I sold the car to a friend and after replacing the fuel pressure regulator and he also swapped in the new plug wires, it ran fine after that.

If you have a thin wrench (it makes it easier, but I didn't find one), you can get the fuel pressure regulator off without pulling the intake. It can be done, just get creative. Be careful to not lose the washer, its unique so I reused mine as I could not find a replacement at that time. Don't over torque it as there was one person who overtightened it and ended up cutting off his fuel flow due to a different washer being used and it was getting pushed to far down that it impeded the fuel flow. On a side note, I was able to find that special washer, but you had to find an OEM whole master gasket set.

 

[SHO GANG]

One of my SHO's had a bog/stumble around 1500 rpm, but would go away after you were going at higher rpm and speed. No codes. Found my pressure regulator was reading in the 80psi range similar to what you found. I sold the car to a friend and after replacing the fuel pressure regulator and he also swapped in the new plug wires, it ran fine after that.

If you have a thin wrench (it makes it easier, but I didn't find one), you can get the fuel pressure regulator off without pulling the intake. It can be done, just get creative. Be careful to not lose the washer, its unique so I reused mine as I could not find a replacement at that time. Don't over torque it as there was one person who overtightened it and ended up cutting off his fuel flow due to a different washer being used and it was getting pushed to far down that it impeded the fuel flow. On a side note, I was able to find that special washer, but you had to find an OEM whole master gasket set.

I replaced the fuel pressure regulator but it's still sputtering I think I'm going to also replace the fuel pressure damper hopefully it does the job. After the fpr it still has the check engine light so I took it back to the shop.

 

[SHO GANG]

check engine light typically fires off a code. If you cannot pull codes from the car there is something wrong with the computer. Get an Innova ford OBI code reader and take guesswork out of it. IF you need to see if the car is reading codes run the car with the MAF unplugged. That should fire an easy code and see if it is readable from pcm. If the car is bucking and such if the car then runs smoother but low on power with the MAF unplugged then you found the issue. Could be a cat. Could be alot of things. Make sure you can pull your own codes and eliminate things. Make sure the spark plug wires are routed from the coil pack correctly

Innova Ford OBD1 Code Reader

Shop for Innova Ford OBD1 Code Reader with confidence at AutoZone.com. Parts are just part of what we do. Get yours online today and pick up in store.

www.autozone.com

Amazon.com

I did try the code reader but it gives me nothing I also unplugged the MAF and it ran rough and when I plugged it back in it runs better but it keeps doing the same issue with the car fluttering while driving but great at idle. If I delete the cats will that throw any codes. Cats are too expensive for me right now.

 

[luigisho]

cat delete should throw codes. MAF unplugged should throw codes. If you do not get a Check Engine light or any readable codes you either are not doing it right or the computer has an operating error

 

[Texas Marauder]

cat delete should throw codes. MAF unplugged should throw codes. If you do not get a Check Engine light or any readable codes you either are not doing it right or the computer has an operating error

This is posted in the wrong forum. It is a problem with a Gen 2. Cat delete does not set any codes on a Gen 2.

 

[SHO GANG]

cat delete should throw codes. MAF unplugged should throw codes. If you do not get a Check Engine light or any readable codes you either are not doing it right or the computer has an operating error

It's probably the computer cause the Auto repair shop cannot get any codes either. Is there a pages you know where I can get the computer?

 

[Devin]

This is posted in the wrong forum. It is a problem with a Gen 2. Cat delete does not set any codes on a Gen 2.

I think this bears repeating.

O2 sensors are upstream of the cats

 

[zoomlater]

It's probably the computer cause the Auto repair shop cannot get any codes either. Is there a pages you know where I can get the compu

It's probably the computer cause the Auto repair shop cannot get any codes either. Is there a pages you know where I can get the computer?

PCM ECU Computer (Used) ( 89-95 ; 96-99 ) V6 / V8

SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the main computer for your car and controls practically everything in the car. SHO Source has a limited number of excellent condition used Powertrain Control Modules (PCM). The PCM is the...

shosource.com

The main front page says they are having some ordering issues now, so you may need to contact Mike at his email shown

 

[luigisho]

It's probably the computer cause the Auto repair shop cannot get any codes either. Is there a pages you know where I can get the computer?

what is the model of the one that came with the car? Get that and I can point to a correct replacement.

This is from a regular taurus but in the pics you can see L2M model on the back sticker and on the front plastic plug to the wiring harness. You original computer should have a SHO specific model identifier in the same places.

OEM Engine Control Module ECU PCM Ford Taurus 3.0L V6 1992 / F20F-12A650-DA | eBay

1992 Ford Taurus GL Sedan 4-Door 3.0L V6 GAS. 1992 Ford Taurus GL Wagon 4-Door 3.0L V6 GAS. 1992 Ford Taurus L Sedan 4-Door 3.0L V6 GAS. 1992 Ford Taurus L Wagon 4-Door 3.0L V6 GAS. 1992 Ford Taurus LX Sedan 4-Door 3.0L V6 GAS.

www.ebay.com

 

[SHO GANG]

what is the model of the one that came with the car? Get that and I can point to a correct replacement.

This is from a regular taurus but in the pics you can see L2M model on the back sticker and on the front plastic plug to the wiring harness. You original computer should have a SHO specific model identifier in the same places.

https://www.ebay.com/itm/3046277812...FUBZTyNuB_rKzCC63zhoudikYS_LiissgLjeqZY[/URis

http://

what is the model of the one that came with the car? Get that and I can point to a correct replacement.

This is from a regular taurus but in the pics you can see L2M model on the back sticker and on the front plastic plug to the wiring harness. You original computer should have a SHO specific model identifier in the same places.

OEM Engine Control Module ECU PCM Ford Taurus 3.0L V6 1992 / F20F-12A650-DA | eBay

1992 Ford Taurus GL Sedan 4-Door 3.0L V6 GAS. 1992 Ford Taurus GL Wagon 4-Door 3.0L V6 GAS. 1992 Ford Taurus L Sedan 4-Door 3.0L V6 GAS. 1992 Ford Taurus L Wagon 4-Door 3.0L V6 GAS. 1992 Ford Taurus LX Sedan 4-Door 3.0L V6 GAS.

www.ebay.com

I'll get back to you with a model number but if this helps for now it's a 94 SHO automatic

 

[luigisho]

PCM D4U1

shosource has some and you can message Dan--member name SV&HOdan. He usually has a variety of used parts and good prices. Use the envelope icon at the top of the forum and type in username. That will send a direct message to the members email used to set up an account on the forum.

I will look around online when I get a little time, but I am sure someone on this forum has one or can also help find one-- and check the facebook group. I hear they are very good for info and parts. You will be able to find one.

 

[SHO GANG]

PCM D4U1

shosource has some and you can message Dan--member name SV&HOdan. He usually has a variety of used parts and good prices. Use the envelope icon at the top of the forum and type in username. That will send a direct message to the members email used to set up an account on the forum.

I will look around online when I get a little time, but I am sure someone on this forum has one or can also help find one-- and check the facebook group. I hear they are very good for info and parts. You will be able to find one.

I found a guy on Marketplace he wants $100 for a complete motor and ECU but he out in Nevada in the middle of know where and does not want to ship the ECU he wants me to go get it and it's about a 10 hour drive one way. I did message someone from SHO source but no luck. I'll have to keep looking I really like this car but parts all so hard to get and it's starting to give me issue after issue. . At first it was the crank position sensor, then the valve cover gaskets leaking, spark plug and wires then it was the fuel pressure regulator and I got and started it today and it cranked over and but did not start and when it did it smelled like gas. But at idle and when I drove it it was fine.