please help my mustang wont come out of limp mode

sgtpepperthestang · Mar 9, 2022

i have an s197 2008 mustang gt with multiple codes, p0141 and 161, p0152,p061b,p1000,and p2196 and 2198.
i have replaced o2 sensors on bank 1 and 2 (the front ones, i am gonna purachase mil eliminators for the cats 02s) i have replaced the throttle body, i have replaced the air filter with a nice knn stock filter. the problem i have is when i start the car it sounds kinda like its misfiring and when i let the clutch off and give it gas will die then jolt to 2k rpms and go (doesnt happen everytime though). the car will die when trying to start (not all the time but happens frequently). the car will be alright for a few minutes of driving but after awhile the wrench light will pop and i loose engine power. its not exactly limp mode though its more like a cut in power. can someome please show me what i need to fix? ive been trying to fix this for a month now.

COramprat · Mar 9, 2022

Do you still have cats?

sgtpepperthestang · Mar 9, 2022

COramprat said:
Do you still have cats?

no, when i bought the car they took them off

COramprat · Mar 9, 2022

That eliminates clogged cats. Sounds like a fuel issue. How about the fuel filter?

sgtpepperthestang · Mar 9, 2022

COramprat said:
That eliminates clogged cats. Sounds like a fuel issue. How about the fuel filter?

i havent checked fuel filter, i asked on another forum too somebody said it could be alternator if its misfiring without a misfire code

COramprat · Mar 9, 2022

It's possible but you would have battery issues. My experience with the alternator is accessories shut down one by one until the car died. Look at the MAF and see if it's dirty. Change the fuel filter.

Were the codes set after it started acting up or before? Sounds like the emissions codes were set before and the rest after it started acting up.

sgtpepperthestang · Mar 9, 2022

emmisons codes were not there and car has been slowly throwing more codes and running rich and poorly throughout the 4 months ive owned it. p0152 is a brand new code i found today.

COramprat · Mar 9, 2022

Sounding more and more like a fuel issue. Go with the fuel filter 1st. Have you added fuel in that 4 months?

Dino Dino Bambino · Mar 10, 2022

It's possible that unmetered air is getting into the engine. Make sure all the connections from air filter to throttle body are airtight, and perform a smoke test to rule out a leaking intake manifold runner gasket.

sgtpepperthestang · Mar 10, 2022

COramprat said:
Sounding more and more like a fuel issue. Go with the fuel filter 1st. Have you added fuel in that 4 months?

lol yes i drive it everyday still. but i originally found the car with one oxygen sensor in it and all the rest hanging out.

sgtpepperthestang · Mar 10, 2022

Bullitt95 said:
It's possible that unmetered air is getting into the engine. Make sure all the connections from air filter to throttle body are airtight, and perform a smoke test to rule out a leaking intake manifold runner gasket.

i did happen to find that the hose on the snorkel that goes to the engine was cracked so i repaired that, gonna check it out today and see what happens

COramprat · Mar 10, 2022

sgtpepperthestang said:
i did happen to find that the hose on the snorkel that goes to the engine was cracked so i repaired that, gonna check it out today and see what happens

Yeah. I forgot to mention air. Check all of those hoses and lines as well.

sgtpepperthestang · Mar 10, 2022

COramprat said:
Yeah. I forgot to mention air. Check all of those hoses and lines as well.

ive done that all the lines are good. after lookinf further i have found that my alternator is good, the battery however has lost 140 or so cca and my o2 sensors for the rear werent put back in when installing the midpipe. could this cause all these codes and problems?

sgtpepperthestang · Mar 10, 2022

sgtpepperthestang said:
ive done that all the lines are good. after lookinf further i have found that my alternator is good, the battery however has lost 140 or so cca and my o2 sensors for the rear werent put back in when installing the midpipe. could this cause all these codes and problems?

**hpipe

COramprat · Mar 10, 2022

sgtpepperthestang said:
ive done that all the lines are good. after lookinf further i have found that my alternator is good, the battery however has lost 140 or so cca and my o2 sensors for the rear werent put back in when installing the midpipe. could this cause all these codes and problems?

The rear O2's shouldn't cause drivability problems. At least in my experience they haven't. Now the battery is another story. Did you have it tested?

Check the MAF as well. A little electrical cleaner should do the trick if it's dirty.

sgtpepperthestang · Mar 10, 2022

COramprat said:
The rear O2's shouldn't cause drivability problems. At least in my experience they haven't. Now the battery is another story. Did you have it tested?

Check the MAF as well. A little electrical cleaner should do the trick if it's dirty.

yes i had it tested today along with the alternator. the cca went from 590 to 433. ive cleaned the maf sensor twice with maf cleaner and it has the same problems still.

COramprat · Mar 10, 2022

As long as the battery is charging you should be OK even if it's a little diminished. I assume you've checked spark plugs? Coils should be ok since you don't have a misfire code. Check your fuel pressure too. I'm pointing toward the simple, inexpensive stuff first.

sgtpepperthestang · Mar 10, 2022

i havent had time to check spark plugs, im gonna do that this weekend.

horse sence · Mar 12, 2022

Having the same problem ,changed all the sensors and still no good . Took it in to Ford and they cant find the problem ,i have another exhaust set up from a 2007 i am going to swap to see if it my cats ,i even swapped my ecu with the one from the 2007 and the 2007 key for the reader and still the same thing ,i believe it is somthing with my 2005 and not the motor because it ran perfect in the 2007 i took it out of

sgtpepperthestang · Mar 12, 2022

horse sence said:
Having the same problem ,changed all the sensors and still no good . Took it in to Ford and they cant find the problem ,i have another exhaust set up from a 2007 i am going to swap to see if it my cats ,i even swapped my ecu with the one from the 2007 and the 2007 key for the reader and still the same thing ,i believe it is somthing with my 2005 and not the motor because it ran perfect in the 2007 i took it out of

i feel you man i just bought sensor stimulators to bypass my cats to see if i can also get rid of some other codes its been a struggle

please help my mustang wont come out of limp mode

sgtpepperthestang

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COramprat

...I can take it. I think.

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