jerking at low RPMS...

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genericstang

New Member

Dec 27, 2002

120

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Marietta. GA

May 16, 2005

#1

• May 16, 2005

• #1

today when i was out driving and slowing down my 88 5.0 (5spd) it started jerking. i was in second and starting to come to a stop. it doesnt do it in any other gear except a little bit in 3rd. and it only does it when slowing down.

i also noticed that it almost feels like the throttle is getting stuck when im accelerating. i dont think its the clutch slipping,(doesnt feel like it at least) its like a "hesitation" after depressing the accelerator.

it has not done this before ever. anyone have any ideas?

 

G

genericstang

New Member

Dec 27, 2002

120

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0

Marietta. GA

May 16, 2005

#2

• May 16, 2005

• #2

bump

 

Dean85GT

New Member

Nov 27, 2004

502

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Thorold, Ontario, Canada

May 16, 2005

#3

• May 16, 2005

• #3

so when you have your foot on the brake your foot is not on the clutch?

 

1991vert

10 Year Member

Feb 27, 2004

1,103

7

69

Ludlow, MA

May 16, 2005

#4

• May 16, 2005

• #4

are you serious? low rpm's with the car still in gear coming to a stop will ALWAYS result in bucking/jerking. why even downshift when coming to a stop? just put the car in neutral. car was going to slow to be in that gear. bucking/jerking when coming to a stop will result in stalling out if you dont put your foot in on the clutch. common sense.

correct me if i misunderstood what you originally said.

 

G

genericstang

New Member

Dec 27, 2002

120

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0

Marietta. GA

May 16, 2005

#5

• May 16, 2005

• #5

no, i think i confused everyone. i know it will buck and jerk if im slowing down in low gear etc. let me see if i can explain this better.

ok lets see here...

for example i was going through the parking lot at about 2K RPM and in second gear and just on the gas a little and it jerks like crazy. and thats never happend before at all.

also in addition to what i posted above, when i first turn on the car on now the RPMs fluctuate from like 550-1000 like 4-5 times then settles out at normal RPM range(around 800 or so, give or take some). this is starting to frustrate me.

anyone have any idea now?

 

8

89lxsport50

10 Year Member

Feb 25, 2003

550

5

39

Franklin Tennessee

May 16, 2005

#6

• May 16, 2005

• #6

Pull the codes. Check alternator output. How old is the fuel filter?

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

May 16, 2005

#7

• May 16, 2005

• #7

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

 

G

genericstang

New Member

Dec 27, 2002

120

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Marietta. GA

May 16, 2005

#8

• May 16, 2005

• #8

Stang8URMPRT said:

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

Click to expand...

i knew this was cumming. ANYWAYS...


ill check the codes. i got a buddy with a reader. i thought maybe it could be the alternator(dont know if its ever been replaced/serviced in the 132K miles that are on the car). i will also check out the fuel filter, i dont think that has been changed either. anyways, thanks for the helping everyone.

keep the posts coming

 

Slo 5.0

Member

Apr 6, 2005

144

0

16

St. Louis

May 16, 2005

#9

• May 16, 2005

• #9

Stang8URMPRT said:

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

Click to expand...

​

 

illwood

Member

Apr 3, 2004

636

1

19

Worcester, MA

May 16, 2005

#10

• May 16, 2005

• #10

But seriously, is this just when it's cold? EGR valve maybe.

 

G

genericstang

New Member

Dec 27, 2002

120

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0

Marietta. GA

May 16, 2005

#11

• May 16, 2005

• #11

illwood said:

But seriously, is this just when it's cold? EGR valve maybe.

Click to expand...

no, it did it throughout the day when i was running arrands. so i dont know? i checked around the engine bay, didnt see anything loose or anything. hmm.

 

50gt1988

New Member

Dec 25, 2004

154

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0

Spanaway, WA

May 16, 2005

#12

• May 16, 2005

• #12

I had the same problem with my 88gt when I would start it the rpms would jump around about 4 or 5 times before it evened out, I replaced the idle control valve and it fixed the problem.

 

G

genericstang

New Member

Dec 27, 2002

120

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0

Marietta. GA

May 16, 2005

#13

• May 16, 2005

• #13

50gt1988 said:

I had the same problem with my 88gt when I would start it the rpms would jump around about 4 or 5 times before it evened out, I replaced the idle control valve and it fixed the problem.

Click to expand...

how much do they run? is it an easy install? thanks for your help!

 

neikoblu

New Member

May 9, 2005

63

0

0

Barksdale AFB, Lousyanna

May 16, 2005

#14

• May 16, 2005

• #14

I know that it will do it in my car but I think that it is just my cam. 513 lift 298 dur.

 

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genericstang

New Member

Dec 27, 2002

120

0

0

Marietta. GA

May 16, 2005

#15

• May 16, 2005

• #15

would it be called(this is at Autozone) a...

IDLE AIR CONTROL VALVE or

IDLE SPEED CONTROL ACTUATOR

 

50gt1988

New Member

Dec 25, 2004

154

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0

Spanaway, WA

May 16, 2005

#16

• May 16, 2005

• #16

Its the long cylinder on the side of the throttle body, 2 bolts and a plug. I can't remember what i paid for the new part but I think it was around 40$.

 

50gt1988

New Member

Dec 25, 2004

154

0

0

Spanaway, WA

May 16, 2005

#17

• May 16, 2005

• #17

genericstang said:

would it be called(this is at Autozone) a...

IDLE AIR CONTROL VALVE or

IDLE SPEED CONTROL ACTUATOR

Click to expand...

IDLE AIR CONTROL VALVE<-------

 

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

Jul 4, 2004

1

0

1

WPG/MB/CA

May 16, 2005

#18

• May 16, 2005

• #18

EXACT same problem i had last summer... it was the TPS sensor. bought a new one and it went away completly

 

G

genericstang

New Member

Dec 27, 2002

120

0

0

Marietta. GA

May 16, 2005

#19

• May 16, 2005

• #19

so its either, the...

-Idle Air Control Valve
-Throttle Position Sensor

or possibly, the PCV (i dont think it has been changed either). i think ill start with this and then work with the others if this doesnt work.

thanks again for everyone's continued help.

 

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

Jul 4, 2004

1

0

1

WPG/MB/CA

May 16, 2005

#20

• May 16, 2005

• #20

edit.......shoulda read the post above me better