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5.0 wont rev past 5500

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Old 06-06-2009, 12:34 PM
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mikekx65
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Default 5.0 wont rev past 5500
I have a 88 GT with a mild 302. The problem is that the motor cuts out around 5500 it runs and drives fine up until about 5500 then it starts to cut out. Any ideas?
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Old 06-06-2009, 12:42 PM
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mattdel
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The cars computer has a built in fuel cutoff around that area... I don't remember the exact number but you don't need to be any higher than 5500 anyway. You're not making any power.
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Old 06-06-2009, 01:00 PM
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mikekx65
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I'm running a N-412 cam and the specs say it makes power up until 6200....i dont see why it wouldnt make any power past 5500....
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Old 06-06-2009, 01:37 PM
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primetime5.0
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Originally Posted by mattdel
The cars computer has a built in fuel cutoff around that area... I don't remember the exact number but you don't need to be any higher than 5500 anyway. You're not making any power.
cutoff is 6250, do you have the correct valvetrain to match the cam specs?
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Old 06-06-2009, 02:20 PM
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mjr46
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what springs you running on the heads??
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Old 04-05-2012, 08:42 AM
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i have the same problem dont ackt nuthing like a rev limiter its a bitch in a race
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Old 04-05-2012, 05:37 PM
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nitrous_bob
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what kind of plug do you have ?

close them up to .046" and see how it runs

are they copper plugs ? or crappy platinum or iridium ? if either....dump them
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Old 04-07-2012, 07:27 AM
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capri debris
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Sounds like a big cam and weak valve springs.... resulting in valve float at anything above 5500 RPM.
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Old 04-10-2012, 09:03 AM
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Same thing happened to mine. I got a diablo Sport chip (extender) and now i can go to almost 7000rpm's
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Old 04-10-2012, 11:42 AM
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im_stuck_in_iraq
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Originally Posted by nitrous_bob
what kind of plug do you have ?

close them up to .046" and see how it runs

are they copper plugs ? or crappy platinum or iridium ? if either....dump them
what plugs you recommend?
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