mustang is bucking and running like crap

donsbad68

Immensely Educated

Jan 4, 2003

838

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0

Oklahoma

Aug 15, 2005

#1

• Aug 15, 2005

• #1

Ok, my 1989 5.0 5spd is running like crap. I have replaced the following parts and the car still bucks in every gear like it has a miss, cruising it bucks at almost any RPM and it acts like it hits a wall at 5000 RPM just boom big time jerk and it wont pull anymore. In extreme case it sounds like it pops out the TB. The timing is set at 12* with the pill out.

New parts:
tune-up
O2 sensors
TPS
EGR
Idle air

 

C

Camman

Founding Member

Jan 5, 2000

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37

Las Vegas, NV

Aug 15, 2005

#2

• Aug 15, 2005

• #2

Troubleshooting so far?
Any codes?

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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0

Oklahoma

Aug 15, 2005

#3

• Aug 15, 2005

• #3

The CEL light comes on only when bucking and goes off when idling or sometimes goes on and off

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Aug 15, 2005

#4

• Aug 15, 2005

• #4

donsbad68 said:

The CEL light comes on only when bucking and goes off when idling or sometimes goes on and off

Click to expand...

And what code is stored?

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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Oklahoma

Aug 15, 2005

#5

• Aug 15, 2005

• #5

no clue have no reader and the nearest parts store is about 50 miles away, wouldnt like to drive it that far like this, the bucking on the hi-way at 75 would get old real fast.

 

donsbad68

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Jan 4, 2003

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Aug 15, 2005

#6

• Aug 15, 2005

• #6

also would like to say its good to see the famous hissin subscribe to my question

 

txgunrunner

New Member

Apr 29, 2005

68

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0

houston, tx

Aug 15, 2005

#7

• Aug 15, 2005

• #7

my car is running like that and dying on me and cleaning the idle air control was suggested. i havent had time to clean mine though. good luck

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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0

Oklahoma

Aug 15, 2005

#8

• Aug 15, 2005

• #8

my idle air is brand new

 

txgunrunner

New Member

Apr 29, 2005

68

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houston, tx

Aug 15, 2005

#9

• Aug 15, 2005

• #9

duh, sorry

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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Oklahoma

Aug 16, 2005

#10

• Aug 16, 2005

• #10

quite alright anyone else have any ideas?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Aug 16, 2005

#11

• Aug 16, 2005

• #11

donsbad68 said:

no clue have no reader and the nearest parts store is about 50 miles away, wouldnt like to drive it that far like this, the bucking on the hi-way at 75 would get old real fast.

Click to expand...

Here is some info on retrieving the codes with a paperclip/jumper wire, etc.
That is where i would start. Your repair manual should also have a run-down on pulling codes.
The thing with EFI is that it is a bit more complex than a carbed set-up. So it is nice to utilize the on-board diagnostics to help find issues.

Are you sure your plug wires are up to par? One can get a nasty miss if they are bleeding.

Good luck.

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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Oklahoma

Aug 16, 2005

#12

• Aug 16, 2005

• #12

plug wires and supporting ignition items are all brand new.

 

Scott_95GT

New Member

Oct 8, 2004

387

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0

Sacramento

Aug 16, 2005

#13

• Aug 16, 2005

• #13

Harmonic Balancer could be on it's last leg.

 

88GTStreetRod

Member

Jan 5, 2004

376

1

18

USA

Aug 16, 2005

#14

• Aug 16, 2005

• #14

My car did the same thing. I replaced everything and nothing helped. What fixed my problem was the mass air meter. I clocked the meter 90 degress.

 

donsbad68

Immensely Educated

Jan 4, 2003

838

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0

Oklahoma

Aug 16, 2005

#15

• Aug 16, 2005

• #15

problem is fixed! I broke down and went and bought a 20 dollar code reader, and for next to nothing fixed the problem. Turned out the TPS voltage was way too high and the EGR valve didnt have any vacuum! Thanks for the help guys she is running like a champ now!

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Aug 16, 2005

#16

• Aug 16, 2005

• #16

Glad you got it fixed. Knowing the codes really helps.

 

C

Camman

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Las Vegas, NV

Aug 17, 2005

#17

• Aug 17, 2005

• #17

Right on!!! Thats awesome that you fixed it with the codes.