Mustang wont run right; idles rough, bogs and dies

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 19, 2011

#1

• Jan 19, 2011

• #1

Thought I had a bad fuel pump but cleaned MAF, TPS, and IAC sensors and got it to run. Idles kinda rough, stumbles, and dies if you give it too much throttle. No check engine light but got a code for rich right bank. YouTube - Mustang runs bad, dies Car had sat for a month and was dead. Replaced battery and was hard to start then ran for a minute, died, and would then just crank. Disconnected battery, cleaned MAF, IAC, and TPS, now will run but idles kinda rough, idle speed fluctuates, bogs when open throttle, and if I open throttle too fast will die.

 

twogts4us

15 Year Member

Apr 1, 2004

4,188

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79

Dunedin, FL

Jan 19, 2011

#2

• Jan 19, 2011

• #2

My educated guess is the IAC is still not functioning properly.
You can also disconn the MAF and see if the condition changes

 

M

mrjucs

New Member

Jan 15, 2011

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0

Jan 19, 2011

#3

• Jan 19, 2011

• #3

with the right bank code , i would check the O2 sensors and see if they r working properly

have u done a compression test? How about plugs and wires? Vacuum test?

And yeah your IAC still could be bad and you need to get a new one..they r not that expensive at the parts store

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 19, 2011

#4

• Jan 19, 2011

• #4

Also to go with the rich right bank trouble code, it also throws the code for OBD-II Monitor Testing Incomplete. Ive had this before when battery was disconnected. Without running the car I just double checked the codes and got a Fuel Trim System Lean for Bank 1 and Bank 2.

 

johnnyt03gt

5 Year Member

Mar 15, 2008

453

5

29

dallas TX

Jan 20, 2011

#5

• Jan 20, 2011

• #5

i'd pull the plugs, and check the coils & boot's

 

GDawg

Founding Member

Mar 22, 2002

1,469

19

68

Nevada

Jan 21, 2011

#6

• Jan 21, 2011

• #6

Sounds like a vacuum leak to me...

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 21, 2011

#7

• Jan 21, 2011

• #7

Well now it just cranks, wont start.

 

M

mrjucs

New Member

Jan 15, 2011

8

0

0

Jan 22, 2011

#8

• Jan 22, 2011

• #8

trailblazr81 said:

Well now it just cranks, wont start.

Click to expand...

check all vacuum lines, pull and replace the plugs with 1 range cooler of a plug (all Champions are cooler than factory plugs)

What did u clean the MAF with? Does the starter sound weak? Have you checked fuel pressure with a gauge yet??????

What about the other things in the post that was asked???

If your running lean, then MAF would be more of a concern. You may need a new one and you need to check the O2 sensors as well.

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 22, 2011

#9

• Jan 22, 2011

• #9

Plugs n wires look ok. Couldnt find a vacuum leak. Starter sounds fine. Cleaned MAF and IAC with MAF cleaner. Just sprayed didnt touch wires.

 

joshjwc9

Active Member

Jun 12, 2006

1,095

17

39

Palm Harbor, FL

Jan 22, 2011

#10

• Jan 22, 2011

• #10

Does it turn over and just sound like it isn't getting any air? When my IAC went bad I tried cleaning it, which helped for all of a day, then nothing. Replaced the IAC and wholla, all better.

 

trinity_gt

10 Year Member

Jan 31, 2003

3,125

81

99

Canada

Jan 22, 2011

#11

• Jan 22, 2011

• #11

Check for fuel at the Schrader valve on the passenger-side fuel rail. If you don't have a gauge you can still do a "go/no go" test: Depress the Schrader and look for a spray of fuel. (Obviously, be careful re smoking etc...)

If you don't see fuel, you may have pump, FPDM or CCRM issues. If there's fuel, you may have a spark delivery problem (wiring, fuses etc).

Given the car's tendency to stall or want to when the throttle was cracked I'm leaning toward a fuel problem.

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 25, 2011

#12

• Jan 25, 2011

• #12

If this makes sense, on the Fuel Pump Driver Module I only see power on #7 light blue/orange Fuel Pump Monitor and #10 Brown/Pink Fuel Pump +.

 

brtnstrns

Member

Dec 19, 2003

606

11

19

Lewisville, TX

Jan 26, 2011

#13

• Jan 26, 2011

• #13

My car was acting very similar to this less than 2 weeks ago: mainly the horrible idling and stalling out. After doing the "cheaper" stuff like replacing the plugs and cleaning/checking the EGR valve, MAF sensor, etc. It ended up being that I just had to replace the heated O2 sensor on the drivers side (my car was throwing a drivers side bank code). After I replaced the O2 sensor everything was back to normal again. Might want to look into that if its not something you've done recently.

 

Brute03

Member

Mar 20, 2006

232

0

16

Jan 26, 2011

#14

• Jan 26, 2011

• #14

check for fuel pressure, can you hear the pump priming when you turn the key on?

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Jan 26, 2011

#15

• Jan 26, 2011

• #15

Cant hear the pump and nothing at the schrader valve.