XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

gasping @ 4500 rpm

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Old 06-14-2012, 09:12 PM
calvindoesntknow's Avatar
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Default gasping @ 4500 rpm

I just took mine out today to a local car show and as i was pulling away i noticed it starts gasping and sounding raspy at about 4500rpm. I have stock intakes and highflow down pipes but is this normal? I feel like it isnt but i wouldn't know. I have the 5speed so it wad locked in 2nd gear when this happened
 
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Old 06-14-2012, 10:21 PM
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It's nothing I've ever experienced with mine. My first thoughts would be the air/fuel ratio or a weak fuel pump. Others will chime in I'm sure!
 
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Old 06-14-2012, 11:02 PM
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"Gasping"......running poorly, feels like it's cutting out?

Not sure what model you have but if it's a V12 HE with Lucas ignition, your secondary coil might be failing. This typically happens at 3000-3500 rpm, but, still......might be. It's a fairly well known problem

Cheers
DD
 
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Old 06-15-2012, 11:22 AM
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Its almost like its coughing and spitting. I think it mighy be fuel and i wont be able to tell untill i get a pressure gauge set up while im running under load
 
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Old 06-15-2012, 01:20 PM
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Originally Posted by calvindoesntknow
Its almost like its coughing and spitting. I think it mighy be fuel and i wont be able to tell untill i get a pressure gauge set up while im running under load
I am going with Doug on this. It sounds like the coil setup is not working.

Greg
 
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Old 06-15-2012, 08:16 PM
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Ill see, it used to make the same sorta noise when it had bad fuel pressure anyways so well see this weekend
 
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Old 06-15-2012, 08:32 PM
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im picking up one of Jameys coil upgrades this weekend.
 
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Old 06-15-2012, 08:47 PM
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I was thinking the coil upgrade was $70.

i just looked it up again, and at $35 + $11 shipping you would have to be crazy not to elminiate the old system!


http://www.gbcarparts.com/proddetail...rod=BP-DAC6093


whups, i think i just bought the last one in stock. Xp
 
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