Big problem and no idea what to do.

91MustangGT1991 · May 25, 2020

I have a 91 Mustang GT with gt40 intake manifold and gt40p heads. It seems to me that something is causing the car to add to much fuel and advancing the timing way to much and at about 1,500 to 2,000 rpm it just backfires and spits and sputters and does not go further than 2,000 rpm. When i got the car i had noticed the maf sensor was unplugged and all the problems started when i plugged it in . I have been running in circles since February since i got the car and at this point anything helps.

General karthief · May 25, 2020

I take it you bought it this way,
go here and do this checklist step by step, don't skip around.
Post here any questions you have.

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...

forums.stangnet.com

91MustangGT1991 · May 25, 2020

Yes i did

General karthief · May 25, 2020

91MustangGT1991 said:
Yes i did

Did what?

Potomus Pete · May 25, 2020

Its going to be some work to figure it out. We have all been there with the list. Sounds messy I would consider finding a Mustang expert only because you seem to know a little about cars, but your problem seems like you need specialized diagnostics . Get it going and start fresh. Just my opinion from when my car was messed up and I tried everything.....It was the PIP

91MustangGT1991 · May 25, 2020

General karthief said:
Did what?

I bought it that way

Potomus Pete · May 25, 2020

How long have you had this car?? What do you think is wrong??

91MustangGT1991 · May 25, 2020

I have had the car since February and i am not sure i have never seen anything like this in any of the other cars i have worked on.

Potomus Pete · May 25, 2020

Gas cutting out at 2000 rpm maybe?? You do have to do the checklist no fun whatsoever I would assume you have read more tech on fixin your car, so your at a crossroads. An old fashioned mechanic who knows old cars could figure it out in a couple of hours you just have to ask around. JUST MY OPINION

91MustangGT1991 · May 25, 2020

Potomus Pete said:
Gas cutting out at 2000 rpm maybe?? You do have to do the checklist no fun whatsoever I would assume you have read more tech on fixin your car, so your at a crossroads. An old fashioned mechanic who knows old cars could figure it out in a couple of hours you just have to ask around. JUST MY OPINION

Will do the checklist and talk to some older mechanics thanks for the help.

General karthief · May 25, 2020

The checklist seems intimidating at first, just start at the beginning and take notes. One step at a time.
Then you can take satisfaction that you fixed it yourself.

Potomus Pete · May 25, 2020

I would be going nuts wanting that car going. So lets get it going, and tell us what it was.

91MustangGT1991 · May 25, 2020

Potomus Pete said:
I would be going nuts wanting that car going. So lets get it going, and tell us what it was.

It is driving me nuts we have been having super nice weather and it bums me out not to be able to cruise around in it. And i will definitely let you know i appreciate all your help!

Mstng93SSP · May 25, 2020

Check some basics. Check your firing order and make sure the plug wires are correct. Then verify your timing is correct.

Chris

2000xp8 · May 26, 2020

If you can get your hands on a spare meter (assuming it still has a stock meter and injectors), try swapping it in. While it's no guarantee, in my experience when a vehicle runs better without the meter, the meter itself has been the problem.

Adieu · May 26, 2020

General karthief said:
Did what?

General karthief · May 26, 2020

74stang2togo said:

lemosley1973 · May 30, 2020

Any progress?

kiddiccarus · May 30, 2020

General karthief said:
Did what?

Awesome, and you even asked the question

Adieu · May 30, 2020

kiddiccarus said:
Awesome, and you even asked the question

@General karthief is one of a kind.

Big problem and no idea what to do.

Member

wonder how much it would cost to ship you a pair

Member

wonder how much it would cost to ship you a pair

I'm still waiting for the fully nude shots

Member

I'm still waiting for the fully nude shots

Member

I'm still waiting for the fully nude shots

Member

wonder how much it would cost to ship you a pair

I'm still waiting for the fully nude shots

Member

You have a nice rear end there Dave.

Easy there, this ain't a dating site.

wonder how much it would cost to ship you a pair

Doing something with a heavy tranny now

The first widely accepted Tranny

Easy there, this ain't a dating site.

Similar threads

Privacy & Transparency

Privacy & Transparency