1991 Ford Mustang LX - Sputtering

Blueinfan · Feb 3, 2023

Hi All,

Reaching out to the Fox community for some assistance. The car started sputtering after I hit 2000RPMS. The more I punch it the more it does it but eventually it stops doing it

Engine is complete stock w/92.5k miles on it

New items -

1. MAP Sensor
2. Spark plugs and wires
3. fuel pump 255lph
4. new fuel tank
5. New fuel sending unit
6. TPS
7. EGR value
8. new air filter
9. Fuel regular
10. EGR value position sensor
11. Vacuum lines have been replaced and no leaks.
12. Distributor cap and rotor replaced
13. Ignition coil is new

thanks,
J

90sickfox · Feb 5, 2023

Sounds like a bad TFI module. The one on the side of the distributor. Rockauto has Motorcraft ones sometimes. I'd recommend going with a Motorcraft one but I've been using a standard motor products one for the last 7-8 years.

Mustang5L5 · Feb 5, 2023

Have you dumped the engine codes to see if there is anything the ECU doesn’t like?

General karthief · Feb 5, 2023

Go through this checklist step by step:

Help me create the "Surging Idle Checklist"

Updated 05 July 2022 to add rough idle when cold and smooth idle when up to normal operating temperature. See the EGR tech information, section #15 for more help. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank...

www.stangnet.com

Blueinfan · Feb 6, 2023

90sickfox said:
Sounds like a bad TFI module. The one on the side of the distributor. Rockauto has Motorcraft ones sometimes. I'd recommend going with a Motorcraft one but I've been using a standard motor products one for the last 7-8 years.

Is one better than the other?

Blueinfan · Feb 6, 2023

Mustang5L5 said:
Have you dumped the engine codes to see if there is anything the ECU doesn’t like?

I'll do that today at lunch at noon.

90sickfox · Feb 8, 2023

Blueinfan said:
Is one better than the other?

Yes. Motorcraft is the best. Even a used Motorcraft TFI from the JY is better than half the aftermarket ones.

Mustang5L5 · Feb 8, 2023

90sickfox said:
Yes. Motorcraft is the best. Even a used Motorcraft TFI from the JY is better than half the aftermarket ones.

It’s a sad state of affairs when we typically recommend someone go to a junkyard and find an oem TFI on a car, vs using the junk that is sold today.

Blueinfan · Feb 10, 2023

Mustang5L5 said:
It’s a sad state of affairs when we typically recommend someone go to a junkyard and find an oem coil on a car, vs using the junk that is sold today.

I try not to buy from the JY unless I really have to. I learned my lesson and buy new now.

1991 Ford Mustang LX - Sputtering

Blueinfan

Active Member

90sickfox

Wasn't a pretty sight...and I've got big hands

Mustang5L5

That is…until I whipped out my Bissell

General karthief

wonder how much it would cost to ship you a pair

Help me create the "Surging Idle Checklist"

Blueinfan

Active Member

Blueinfan

Active Member

90sickfox

Wasn't a pretty sight...and I've got big hands

Mustang5L5

That is…until I whipped out my Bissell

Blueinfan

Active Member

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1991 Ford Mustang LX - Sputtering

Active Member

Wasn't a pretty sight...and I've got big hands

That is…until I whipped out my Bissell

wonder how much it would cost to ship you a pair

Active Member

Active Member

Wasn't a pretty sight...and I've got big hands

That is…until I whipped out my Bissell

Active Member

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