99 gt bucking/surging

A

aparker813

New Member

Aug 30, 2005

51

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0

Dec 20, 2005

#1

• Dec 20, 2005

• #1

doin it mostly around 1200-2000 rpms it seems...its def. the engine doin somethin wierd, it'll do it sometimes when im just cruising at a certain speed and now its doing it under acceleration at some points but not WOT. car is making me very angry, tested all my cops and they all tested fine, checked all my plugs and none look bad at all (only 3000-4000 miles old anyways) just cleaned my airfilter too

its a 99 gt with auto tranny, flowmaster, steeda cai and that is all

anyone got ideas?


edit: also of the COPs looked like this one and smelled of fuel

 

MaxedGT

Member

Mar 31, 2005

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17

Surrey BC Canada

Dec 20, 2005

#2

• Dec 20, 2005

• #2

Your problem is in that picture. Moisture has gotten into the plug recesses and has made a pathway for your spark.

 

A

aparker813

New Member

Aug 30, 2005

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Dec 20, 2005

#3

• Dec 20, 2005

• #3

MaxedGT said:

Your problem is in that picture. Moisture has gotten into the plug recesses and has made a pathway for your spark.

Click to expand...

any suggestions on what to do now? and anyone got any ideas as to how moisture got to em so bad? it was on all the boots except the passenger side closest to the firewall hardly had any noticable crap on it

i had to pull and test all of em about two months ago cuz my roomate had been helpin me wash my engine and had sprayed em all down but i only found one bad one then and all was well for a good while

 

sgarlic

Founding Member

Apr 21, 2001

3,085

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56

Dec 20, 2005

#4

• Dec 20, 2005

• #4

How long has it been doing this? When was the first time it did it? Did you do anything right before you started noticing this problem? I would get a can of compressed air, or an air compressor if you have it, and try to blow the crap out of each one on the inside.. and when you press them back on, be sure it is on properly.. if one is hanging off a little, it may not be making full contact with the plug.

 

A

aparker813

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Aug 30, 2005

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Dec 20, 2005

#5

• Dec 20, 2005

• #5

sgarlic said:

How long has it been doing this? When was the first time it did it? Did you do anything right before you started noticing this problem? I would get a can of compressed air, or an air compressor if you have it, and try to blow the crap out of each one on the inside.. and when you press them back on, be sure it is on properly.. if one is hanging off a little, it may not be making full contact with the plug.

Click to expand...

been doin it about 3 weeks now progressively getting worse...i'm at my parents house for christmas so i can actually use a compressor on em, hopefully that'll work

oh yeah...the first time a while ago it started right after power washing the engine but this time it hadnt even been washed in a few weeks when it started

 

Premium Speed

New Member

Apr 22, 2003

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Houston, Texas

Dec 20, 2005

#6

• Dec 20, 2005

• #6

aparker813 said:

power washing

Click to expand...

There you have it.

 

A

aparker813

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Aug 30, 2005

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Dec 20, 2005

#7

• Dec 20, 2005

• #7

Premium Speed said:

There you have it.

Click to expand...

you're right...it WAS my problem that last time. this time there wasnt even any washing of the outside of the car for probably two weeks prior

 

jstreet0204

Active Member

Jun 26, 2003

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Winston Salem, NC

Dec 20, 2005

#8

• Dec 20, 2005

• #8

lowend bucking can be caused by a few things. If drying out the plug holes don't do anything, you might want to check out your egr valve. Mine was sticking and caused some bucking.

 

A

aparker813

New Member

Aug 30, 2005

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Dec 20, 2005

#9

• Dec 20, 2005

• #9

jstreet0204 said:

lowend bucking can be caused by a few things. If drying out the plug holes don't do anything, you might want to check out your egr valve. Mine was sticking and caused some bucking.

Click to expand...

how do i check it? (the egr)

 

jstreet0204

Active Member

Jun 26, 2003

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Winston Salem, NC

Dec 20, 2005

#10

• Dec 20, 2005

• #10

aparker813 said:

how do i check it? (the egr)

Click to expand...

You can try taking off the vacuum line, and plugging the end of it. You can also take it off and use a vacuum pump on it to see if it is opening and closing correctly. I just blocked mine off and did away with it, but without a tune, that will throw a code.

 

Malevolyn

New Member

Dec 7, 2005

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Lakeland, FL

Dec 21, 2005

#11

• Dec 21, 2005

• #11

My 96 Cobra started doing this right after I cleaned my air filter. The filter might have been too wet when I put it in, should I check my COPs and EGR as well or would that lead to a different cause? The bucking hasn't gotten any worse since it started, and it also doesn't do it at WOT. It bucks mainly during normal acceleration and if I try to accelerate at low RPMs in higher gears. Like going from 2000 to 2500 RPMs in 5th.

 

jstreet0204

Active Member

Jun 26, 2003

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36

Winston Salem, NC

Dec 21, 2005

#12

• Dec 21, 2005

• #12

Malevolyn said:

My 96 Cobra started doing this right after I cleaned my air filter. The filter might have been too wet when I put it in, should I check my COPs and EGR as well or would that lead to a different cause? The bucking hasn't gotten any worse since it started, and it also doesn't do it at WOT. It bucks mainly during normal acceleration and if I try to accelerate at low RPMs in higher gears. Like going from 2000 to 2500 RPMs in 5th.

Click to expand...

I'd try cleaning your MAF first if it started after cleaning the filter. There is probably some oil on the wire.

 

Malevolyn

New Member

Dec 7, 2005

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Lakeland, FL

Jan 1, 2006

#13

• Jan 1, 2006

• #13

Did that yesterday and didn't help. I guess I'll check the COPs. I really don't feel like messing with the EGR valve right now.

 

W

Will Smith

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Aug 8, 2004

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Cape Coral, FL

Jan 1, 2006

#14

• Jan 1, 2006

• #14

jstreet0204 said:

lowend bucking can be caused by a few things. If drying out the plug holes don't do anything, you might want to check out your egr valve. Mine was sticking and caused some bucking.

Click to expand...

heheh i took my egr valve and tube off completly lol.