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Old 12-03-2014, 11:03 AM   #1
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98 gt running roughly

I have a 98 gt which recently started running very rough. There are no codes and the cel doesn't flash for a misfire but that is exactly what it feels like. It runs like this at idle and during exceleration but while cruising it's intermittent. I have read multiple posts on different sites but the issues are vast. I'm hoping to pinpoint this without wasting a lot of time checking every little thing. Any help would be greatly appreciated.


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Old 12-03-2014, 01:42 PM   #2
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I would start diagnosing the problem with the ignition. Ignition wires, spark plugs. Etc.


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Old 12-03-2014, 03:38 PM   #3
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When is the last time it had a tune up?

Clean the MAF element
New filter or clean the K&N
Spark plugs
Motorcraft wires

If it hasn't been done in awhile you should do all that anyway and its not expensive.
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Old 12-03-2014, 04:03 PM   #4
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check for vacuum leaks as well.
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Old 12-03-2014, 04:25 PM   #5
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Quote:
Originally Posted by scottydsntknow View Post
When is the last time it had a tune up?

Clean the MAF element
New filter or clean the K&N
Spark plugs
Motorcraft wires

If it hasn't been done in awhile you should do all that anyway and its not expensive.
Exactly, +fuel filter.
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Old 12-03-2014, 05:08 PM   #6
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I did a tune up last year I couldn't imagine it needing another one but being a mechanic nothing surprises me anymore


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Old 12-03-2014, 05:57 PM   #7
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Have you checked your coolant level? Any sign your losing some?

I'd look at the plugs at least, if you haven't already.

Actually, what have you checked/done so far?
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Old 12-03-2014, 06:04 PM   #8
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I haven't actually had a chance to look at the car and as far as the coolant the level it's good just did a flush 2 days ago


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Old 12-03-2014, 07:16 PM   #9
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Other than the tune up... the fuel filter and the crankshaft position sensor come to mind. Also the camshaft position sensor. I just sold a 98 and it was cutting out around 4k RPM. New crank sensor fixed it right up.
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Old 12-03-2014, 07:43 PM   #10
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COPs sometimes go without tripping codes as well, happened to a friend a while back, two boots were bad

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Old 12-03-2014, 07:45 PM   #11
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It could be anything. Look over the car first.
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Old 12-03-2014, 07:49 PM   #12
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Well I don't have to worry bout cop since I don't have that but the first chance I get ill go over the obvious things and look in spots where I was working and see if I didn't accidentally knocked something loose


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Old 12-03-2014, 08:23 PM   #13
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Quote:
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COPs sometimes go without tripping codes as well, happened to a friend a while back, two boots were bad

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Beautiful thing about the 96-98 cars is that the coil packs almost never go bad and they use good old fashioned spark plug wires.
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Old 12-03-2014, 08:58 PM   #14
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Quote:
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Beautiful thing about the 96-98 cars is that the coil packs almost never go bad and they use good old fashioned spark plug wires.
Lol just noticed he's a 98, my buddy's was a 99

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