Stumbles at 3000rpm

F

frcefedlx

New Member

Dec 6, 2004

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Feb 10, 2008

#1

• Feb 10, 2008

• #1

I have been chasing a gremlin for a while now and here is what I have come up with. While monitoring the voltage on my TPS it will go from below 1 volt and as it hits three volts while opening throttle it will blank out and show nothing until i pass this point. I am thinking there should not be a dead spot there and think this would cause the stumble I experience at about 3000rpm. any thoughts would be appreciated.

 

R.J.

Member

Aug 20, 2003

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Warwick, Rhode Island

Feb 10, 2008

#2

• Feb 10, 2008

• #2

New TPS

 

final5-0

Mustang Master

Apr 6, 2003

6,817

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DFW Texas

Feb 10, 2008

#3

• Feb 10, 2008

• #3

Check the output of the tps with the motor not running :Word:

Might have to take it off ... I don't know
but
Here is the main idea

You ought to see a nice smooth sweep on your gauge

No herky jerky kinda thing should be seen

Grady

 

F

frcefedlx

New Member

Dec 6, 2004

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Feb 10, 2008

#4

• Feb 10, 2008

• #4

Yes, the motor was off and just a nice gradual sweep of the throttle blade while I watched the voltage rise. It hits 3 volts and then nothing and appears to be intermittent above that. This is the last thing I really looked at so it has to be the problem. I was always leading towards an electrical issue because I could monitor fuel and checked everything else. So I guess a new TPS is in order.

 

RIO5.0

15 Year Member

Feb 16, 2001

6,892

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N.H.

Feb 10, 2008

#5

• Feb 10, 2008

• #5

I would assume your correct as it dies after 3 volts... Let us know how it turns out..Sometimes electrical chit can be voodoo to fix...

 

F

frcefedlx

New Member

Dec 6, 2004

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Feb 11, 2008

#6

• Feb 11, 2008

• #6

I will probalbly revive this thread with a response later as I am going in for surgery on my hand and wont get around to fixing it for a little while.

 

final5-0

Mustang Master

Apr 6, 2003

6,817

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79

DFW Texas

Feb 11, 2008

#7

• Feb 11, 2008

• #7

frcefedlx said:

I will probalbly revive this thread with a response later as I am going in for surgery on my hand and wont get around to fixing it for a little while.

Click to expand...

Hope the surgery goes as planned

Let us know the outcome and Good Luck

Grady

 

95CobraMike

Active Member

Apr 12, 2004

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Lima OH

Feb 12, 2008

#8

• Feb 12, 2008

• #8

ok this might be dumb.... ive had this a few times before..

my timing was off once
and the other time i had 2 bad spark plugs

but if you have narrowed it to your tps.. dont listen to me

 

F

frcefedlx

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Dec 6, 2004

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Feb 12, 2008

#9

• Feb 12, 2008

• #9

I have checked the timing and checked it again, all is good. I pulled all plugs and everything seems to check out there as well. they appear to be firing. The only discrepancy is the TPS voltage going dead as it hits 3 volts. I plan to do a good tune up along with the TPS however I will do just the TPS first and see what the results are from just that. I like to give it all new plugs, cap and rotor and check it all out around springtime anyway.