Misfiring?

[SHOPhear95]

I don't know how to actually explain it, at around 35 to 40mph it seems like i'm getting misfires. I press the throttle and it takes a second for the revs to pick up. any help will be appreciated

matt


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1995 ATX
Custom 3in catback with Vortech mufflers
Intrax lowering springs
Sho-Shop lpm
Sho-Shop CAI
Mille Miglia Action with meaty 245/45/17's pirelli p7000's
and a PEC Performance Ram Air system sitting upstairs waiting to be installed.
"it's the four door, emereld green, 5 liter mustang eater"

 

[HELLBENT93]

I have the same problem in my 93 atx. I dont know exactly what it is but I think it might have something to do with the overdrive on the trans...i could be wrong though. I replaced my plugs and wires and it still did the same thing after, so im pretty sure your problem is not the plugs/wires. You might also want to check your fuel pump.

 

[sdpatt]

Originally posted by HELLBENT93:
I replaced my plugs and wires and it still did the same thing after, so im pretty sure your problem is not the plugs/wires.

I don't believe that you used valid logic to arrive at your conclusion. YOUR problem is probably not the plugs and wires, but it doesn't have any effect on his condition. The main cause of misfires on the SHO engine is the secondary ignition system: plugs and wires. These should be the first items to check.




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Scott

1991, 252K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
Class II hitch, Silver award at the SHOklahoma Car Show

 

[SHOPhear95]

I just had my fuel pump done two days ago. made a big difference in throttle response. but still seems like it misfires going into overdrive. oil in the plug wells would cause such an annoyance?

matt

 

[sdpatt]

That would be correct.

Scott

 

[SHOPhear95]

Well today I took off a a couple of spark plug boots and what do i find? oil... a decent amount of oil. enough to make a happy sho owner not so happy. i know it's been talked about before but. how easy is it to fix this? have to take off the intake manifold, valve covers? do i go to a local part store and pick up spark plug seals?


matt

------------------
1995 ATX
Custom 3in catback with Vortech mufflers
Intrax lowering springs
Sho-Shop lpm
Sho-Shop CAI
Mille Miglia Action with meaty 245/45/17's pirelli p7000's
and a PEC Performance Ram Air system sitting upstairs waiting to be installed.
"it's the four door, emereld green, 5 liter mustang eater"

 

[sdpatt]

You can get the plug wells seals and the valve cover gaskets (seals) in the Fel-Pro VS59378R set from AutoZone or O'Reilly. It is usually a 2-3 day order.

You will have to remove the intake and valve covers to replace these seals. Might as well plan on the valve gapping job if possible.


------------------
Scott

1991, 252K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
Class II hitch, Silver award at the SHOklahoma Car Show