Stumbles at high rpm

bigsparky

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May 14, 2003

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Jul 1, 2004

#1

• Jul 1, 2004

• #1

Ok tonight I raced an srt-4... and is it just me or are those things really not that fast???

anyways... I noticed at about 4500rpm my car seemed to stumble a bit.. most noticeable in 2nd and 3rd gear. I just replaced my spark plugs, fuel filter, cap and rotor.. the only thing i didn't change was the spark plug wires because they seem to be ok. Would this be the first place to look?

 

HISSIN50

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

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Nov 29, 1999

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#2

• Jul 1, 2004

• #2

what plugs are you runnin? platinums are known to cause higher rpm breakup in SOME efi 5.0's.

might pull codes. things that come to mind are that your FP is on the way out and you leaned out. or the PIP or TFI are on the way out - both toss their cookies at higher RPM's, esp when hot.
my random thoughts.
good luck.

 

jrichker

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#3

• Jul 1, 2004

• #3

TFI's fail when they are hot and running at high RPM's.

Spark plug wires have two simple tests.
1.) Find a really dark place, crank the car up, open the hood and look for an electrical sparks show. No show, and the insulation is good.

2.) Use an Ohmmeter to measure the resistance of the wires. They should measure about 2000 ohms per foot of length. More that is a bad wire. Less that that is OK.

 

bigsparky

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Jul 4, 2004

#4

• Jul 4, 2004

• #4

I'm not using platinum plugs.. just normal ones

I have no codes except for a pesky 31 which is for the EGR

How can i check my FP without buying and installing a $100 guage.... and if it IS my FP.. how can i fix it?

 

HISSIN50

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

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Nov 29, 1999

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Jul 4, 2004

#5

• Jul 4, 2004

• #5

bigsparky said:

How can i check my FP without buying and installing a $100 guage.... and if it IS my FP.. how can i fix it?

Click to expand...

by using a 30 dollar one.

i would go with what JR says. a parts store can bench test a TFI, but unless it happens to fail while testing (meaning it would probably need to be physically hot), the test is likely flawed. i bet JR has some ideas for ya. good luck.

 

bigsparky

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Saskatoon, Saskatchewan

Jul 5, 2004

#6

• Jul 5, 2004

• #6

HISSIN50 said:

by using a 30 dollar one.

i would go with what JR says. a parts store can bench test a TFI, but unless it happens to fail while testing (meaning it would probably need to be physically hot), the test is likely flawed. i bet JR has some ideas for ya. good luck.

Click to expand...

bump

 

T

twstd50

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Oct 20, 2003

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Jul 5, 2004

#7

• Jul 5, 2004

• #7

Try replacing the coil...

I the same syptoms, replaced the coil and it was gone.