Dies under 3,000 RPM's

[92MTX]

Pull the codes, I know.... It's almost midnite, and I just drove 5 hours..
Well, stop and go.. LOL
Here it is, New fuel filter, changed TPS, coil, cleaned MAF, new O2's, good grounds. Bogs and dies, at low rpm's, mainly.
It is not using coolant. When it acts up, you can floor it, and it wont rev at all, you have to goose the pedal till it will rev..
Started randomly dieing at lights, or under 3,000rpm..
I have to feather the throttle until it quits bogging, then it revs, and I have to keep the revs up, or it will die.. Runs great on the freeway, no overheating. Check engine light is on.. unplugged the MAF, ran worse..
Unplugged the FPR vac. hose, no difference. unplugged the TPS, no difference. Changed TPS, no help.
I heard my exhaust "Boiling" long after It died on me... Maybe the cat is shot?
Sounded like a steam radiator.. haha.. SO, I changed the O2's... NO help..
Smelled some strong gas smells a couple times, it runs fine on the freeway, then just dies out, and coasts to a stop.. After a while it will start up, and will go anywhere from a block, to 100 miles before stalling/bogging/surging/dieing.
Usually at a light, or in traffic...
Drove it 172 miles one way, ran great.. On the way home, well, you know..
Ideas??
Pull codes..
check fuel pressure..

 

[SHOspazz92]

Except for the Stalling part - My car had very similar issues when I found water in the plug wells (Spark plug wires didnt seal very well on the valve cover and drove the car through a heavy storm). Hope this helps.

-Sam

 

[92MTX]

It starts, and idles... Push on the gas, and will die, let off the gas, and it will idle...:laugh_ti:

 

[oneqwicksho]

I would say tps but, you already changed that. I had the same problem as above with water in plug wells and, had to get a tune up (plugs and wires) to fix the problem and, when that happened my cats sounded like the same " a boiling radiator " and were red. Reason they were turning red is it wasn't getting enough spark and was dumping raw fuel into the exhaust. I would clean iac, check fuel pressure, may have a wide open injector. Just a couple things to check

 

[92MTX]

Thanks! Plugs, wires, my "good" intake all go on today, soon as I pull the damn codes.. grumble, grumble..
Called in work today to fix it, bad news is I LIVE where I work... D'OH!!!
Thinking about a new MAF...

 

[oneqwicksho]

I would wait on the maf. if you unplugged it and it made matters worse it sounds like its working. I think the plugs and wires is a good start with the intake. And, let us know when you pull the plugs what you find ( if there wet, dry, white, pitted )

 

[93rev2sev]

unplug the MAF; if it's the cause of your problem it'll smooth out.

 

[92MTX]

Thanks, when I did the front 3 plugs, they had a couple white blisters on them, but it was running fine, just went to drive home, and it started bogging, bucking, and stalling... Let it sit for a while, and it fired up.
Go below 3,000 rpm, it will die... Gotta pull those codes... sigh...

 

[oneqwicksho]

On the plugs if it looks like melted spotty deposits resembling bubbles or blister, then its fused spot deposits caused by sudden acceleration

Or if is a white or light grey insulator with small black or gray brown spots and with bluish-burnt apperance of electrodes, then that's overheating caused by engine over heating, wrong type of fuel, loose spark plug, too hot of a plug, low fuell pump pressure or incorrect iginition timing

Pull the new plugs and look at them and see what you see

And check the fuel pressure

 

[92MTX]

Will do...
I hope its not the damn fuel pump...sigh...

When my ATX had weird issues like this, it was the MAF that was bad..
Even the fuel pressure spazzed out, dying, bogging, etc..

.

 

[oneqwicksho]

I just read a post about that cause I'm having fuel pressure problems and, the maf was bad causing bogging and lack of power.

because, the fuel is controlled by maf/computer. the maf sends a signal to the computer letting it know how much air is comming in and, it calculates how much fuel to give the motor so in theory if the mass is not sending signal it will cause the problem

and, if your fuel pump is the problem let me know I think I have a good spare

If you find someone close to you with a good m$af try swaping to see if that is the pronblem rather than throwing your money away

 

[92MTX]

I wish!! I have only seen one other SHO in Lubbock...
The pumps only like a hundred bucks new, I just hate cutting the floor..
I need to check the fuel pressure, but I am home "sick" from work, and the office is 30 feet from my door... sigh...
Just did a side job all weekend (35 hours), Now I am too tired and hung over to go make 10 bucks an hour.. (just made a grand!!) Thats like $27.50? haha
My back is "HURT".. lol.. But I need my car fixed, also.. ****..
Every one that lives here knows I am the Maintenance man, and they ALL know I hurt my back already.. sheesh..
I live in a retirement community (55 and up), and they are some nosy old
f*#kers.. Although they do like crack, and hookers... hmmm.. ????

 

[92MTX]

Codes.

Codes are 121, 122, 565(irrelevant), 157, 158

TPS, and MAF codes...
Buy the parts and hope it works, or dive into the harness with a multimeter??

Would both go out at once? Do the sensors give both codes if failed, or when the circuit is open/shorted?

I may have to check on the surgery I performed on the wiring harness,
during the engine swap.. Hmmm..

 

[oneqwicksho]

Well you already swaped the tps and cleaned the maf. I would unhook the battery with the headlights on to reset the computer and, hook the battery back up, start the car, reset idle, and take it for a spin if the same codes come up I would think wiring exspecialy if you have messed with the wiring

 

[1bad98SHO]

Did you ever check Fuel Pressure?

On the TPS and the MAF check for a good ground and no less that 4.98v on the 5V ref side.

 

[92MTX]

Fixed..

Bit the bullet, went to Vato-zone, and bought a new MAF, and a TPS... Plus the new O2's yesterday.
No more stalling, but it still throws a 565 code..(not worried)
Now I have to switch intakes, and change the back 3 plugs..
And look for a vacuum leak... sigh..
The wiring surgery was the 2 main harness plugs, Ford switched them from male to female..
It was not difficult at all..
(I used to build wiring harnesses for missiles, and bombs, at Motorola G.E.G, in PHX...LOL)
You dont want a million dollar missile not to work because of a bad connection, eh?
I did drop $10,000 dollars worth of diodes and resistors once... Looked like skittles all over the floor..
None of them could be used, as they had hit the floor...
Thats why we were all bonded for a million dollars.. haha

 

[oneqwicksho]

Glad to hear its fixed. I just hope I was helpful in the diagnostic portion

 

[92MTX]

M.a.f...

The M.A.F., when failing, can give an amazing range of symptoms....
It can act like water in the plug wells, low fuel pressure, bad O2's, bad TPS,
bad coil, This is my third one, on 2 different SHO's, none of them failed in the same manner... :laugh_ti:
When all else fails, pull the codes!! LOL