slight miss

J

jlds91389

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Feb 1, 2009

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Apr 9, 2010

#1

• Apr 9, 2010

• #1

After change my intake manifold my car a developed a slight miss. It only does it sometimes like when i leave my house for work it runs fine then at 3pm i get in it and it does it. It does it until it warms up kinda sound like bad gas or a plug/coil is wet. When i sit at a stop like you can feel it kinda "bump" the car and a cruising speed with the cruise set you can barely feel it. Any thoughts?


Jacob

 

trinity_gt

10 Year Member

Jan 31, 2003

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Apr 9, 2010

#2

• Apr 9, 2010

• #2

Check for coolant leaks into the plug wells.

 

patman0911

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Apr 9, 2010

#3

• Apr 9, 2010

• #3

Recheck all the bolts on the intake manifold and plenum/TB and start looking for mis-seated COPs, moisture in the spark plug wells and any loose or cracked (or forgot to reconnect ) vacuum hoses.

 

J

jlds91389

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Apr 9, 2010

#4

• Apr 9, 2010

• #4

ok thanks for the help i will check everything. Could it be the fuel filter? i changed it about 2 months ago but ya never know. what about bad/goin bad plugs or cop?

 

patman0911

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Apr 9, 2010

#5

• Apr 9, 2010

• #5

I'd be surprised if it were the fuel filter since you just changed it. It seems much more likely that it's something related to the intake swap since that's when it started.

Why did you change intakes - did the old one crack? If so, you may have gotten coolant in one of the plug wells and there may be some moisture still trapped in one of the COP boots, or the boot may have been damaged from arcing - they can go bad, just like plug wires do.

 

J

jlds91389

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Apr 9, 2010

#6

• Apr 9, 2010

• #6

the inlet for the heater hose on the back snapped off. like you said i might have gotten some water or something down there. is there anyway to test the coils?

 

J

jlds91389

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Apr 11, 2010

#7

• Apr 11, 2010

• #7

ok guys i checked all of the vacum lines and all are good. as i am in houston without my tools i cant check to cop or spark plugs. The miss stops when the car gets to its operating temp is this a sign that just my plugs are bad?

 

D

Deleted member 38176

Apr 12, 2010

#8

• Apr 12, 2010

• #8

Its most likely something having to do with the coils and plugs. Either there is is moister in the plug wells, bad coils or plugs, or incorrect reinstallation of the coils/plugs after the swap. I have the same problem, only my car misses EXTREMELY bad. I just changed the fuel filter a week ago and it's still missing. Definitely the coils/plugs.

 

J

jlds91389

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Apr 12, 2010

#9

• Apr 12, 2010

• #9

Changes the coil and the plug. There was no sign of moisture anywhere. The only thing I seen was the very small tip on the looked broken off put a new plug in and all was fine for about ten minutes then the miss came back. Any thoughts?

 

J

jlds91389

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Apr 12, 2010

#10

• Apr 12, 2010

• #10

Forgot to mention I have a code for a missfire in cylinder no 4