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What is an 'Engine Miss'?

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Old 10-04-2007, 09:01 PM
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72MachOne99GT
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Default What is an 'Engine Miss'?

As I"ve posted recently, the car is 'chugging' and lurching around 1400-1800 rpms, mostly while crusing, and most significantly in fifth.

But, even in 2nd - 4th when Im accelerating rather light the car lurches right around these RPMS and then continues on.

5th at about 40 mph *or 1600 rpms* is HORRIBLE, i can feel it in the car, on the shifter, enough almost for a real light whiplash motion.

Could it be an engine miss? and what exactly is a 'miss'?
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Old 10-04-2007, 09:43 PM
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uberstang1
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Default RE: What is an 'Engine Miss'?

Any engine miss, is a missfire, could be on one or multiple cylinders, it can be caused by spark cut, fuel cut, inproper spark, etc
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Old 10-04-2007, 10:51 PM
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GhostRider02GT
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Default RE: What is an 'Engine Miss'?

is the exhaust sound normal, or is "missing" with the engine. If the ehaust sounds funny, you have fuel, air,and/or spark delivery problems, if not, its something else.
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Old 10-05-2007, 08:00 AM
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Chopper
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Default RE: What is an 'Engine Miss'?

Read this.

http://www.bullittarchive.com/7009.htm
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Old 10-05-2007, 08:46 AM
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97targa
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Default RE: What is an 'Engine Miss'?

99gt so this means you have COPS.(coil on plugs)I bet one of your units is bad. Usually when a unit is bad is makesthe car run like poo when it's under severe pressure (like 1600rpms in 5th gear....gotta floor it to get anywhere) or at a steady rpm down low.
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Old 10-05-2007, 09:15 AM
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99 GT vert
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Default RE: What is an 'Engine Miss'?

i had the same problem an while ago and my coil was bad and i think i have another one going
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Old 10-05-2007, 11:50 AM
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72MachOne99GT
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Default RE: What is an 'Engine Miss'?

ORIGINAL: GhostRider02GT

is the exhaust sound normal, or is "missing" with the engine. If the ehaust sounds funny, you have fuel, air,and/or spark delivery problems, if not, its something else.
I have a very noticeable 'puff puff poof' like sound coming from the pass. side tailpipe, not from both.

Got more pronounced within the last two weeks or so.

Would a bad coil cause the car to act retarded only at particular rpms?

Like, if im in 5th, and go with cruise control at 1600 rpms, i get jerk, lurch, jerk lurch, second of stable throttle, jerk lurch...

even w/o CC though, that was just to make a point...[&o]
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Old 10-05-2007, 12:06 PM
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99 GT vert
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Default RE: What is an 'Engine Miss'?

clint i have some coils at home from when i fixed mine i had to buy 8 so if you want to try and see if that help just let me know and i will get a couple for you to try
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Old 10-05-2007, 12:12 PM
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2002GTAUTOVERT
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Default RE: What is an 'Engine Miss'?

ORIGINAL: 72MachOne99GT

ORIGINAL: GhostRider02GT

is the exhaust sound normal, or is "missing" with the engine. If the ehaust sounds funny, you have fuel, air,and/or spark delivery problems, if not, its something else.
I have a very noticeable 'puff puff poof' like sound coming from the pass. side tailpipe, not from both.

Got more pronounced within the last two weeks or so.

Would a bad coil cause the car to act retarded only at particular rpms?

Like, if im in 5th, and go with cruise control at 1600 rpms, i get jerk, lurch, jerk lurch, second of stable throttle, jerk lurch...

even w/o CC though, that was just to make a point...[&o]
i had the same exact thing a while back.. turned out it was a bad coil and plug. when i got the car it had Bosch Platinum +4's [sm=headbang.gif]. replaced both and it went away, but i assume it was the coil.
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Old 10-05-2007, 01:40 PM
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Eagle2000GT
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Default RE: What is an 'Engine Miss'?

I had the same thing happen a few months ago. One of the coils went bad.
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