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Unread 09-09-2010   #1 (permalink)
JohnTaliaferro2 is offline Rookie


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Default 1988 Mustang gt 5spd (speed density) timing question

I have the timing set at 10deg advanced I run 89 gas and I have only the following upgrades:
Cold Air intake
Performance headers
Flowmaster 2.5" exhaust w/hi-flow cats
Fuel Pump is oem specs from autozone
distributor is a motorcraft oem part
Any ideas as to where the timing should be set should I remain at 10deg advanced as per stock reccomendations. or advance a little more.

She is missing in 2nd&3rd gear between 2k-3k rpm under acceleration and I am wondering if this is the cause
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Unread 09-09-2010   #2 (permalink)
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Your timing is fine. You could bump it up to maybe 12 degrees on 89.
Check your plug wires, make sure they are not laying on the headers or near anything that could be rubbing and causing it to short out. While your at it, check other things like cap, rotor plugs. If its just starting to get a miss at certain rpms its only going to get worse as you keep driving it.
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Unread 09-09-2010   #3 (permalink)
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Default 16 ok

I run my 1992 on 16 degress witg no problems but every car is different. I don't think timing is you problem. Is the missfire only under hard driving?
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Unread 09-09-2010   #4 (permalink)
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the plugs are off the headers and are as safe as tey can be I just put them in on sunday. the distributor is good I cant find any cracks or the anything else wrong. the car will miss under any acceleration between 2k-3k rpm but it is more noticeable under heavy acceleration just do to the dive it takes but it is only about a fraction of a second hesitation.
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Unread 09-09-2010   #5 (permalink)
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what about any other rpms? It still do it when its cold or at normal temp? Did it do it before you changed the wires?
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Unread 09-09-2010   #6 (permalink)
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the idle is only bad when she is cold when she is warm no problem on the idle, when driving around the missing happens when it is cold or hot but usually only between 2k-3k rpm
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Unread 09-10-2010   #7 (permalink)
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Did it have the misfire before you changed the wires? I'm still thinking its something ignition related. Have you checked your fuel pressure, fuel filter, air filter, basic tune up parts?
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