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nut this one out 

 

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 Post subject: nut this one out
Posted: Wed Mar 19, 2008 10:18 pm 
Stock as a Rock
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Ride: EF FAIRMONT

Location: melbourne
VIC, Australia

working on a el today that wont rev past 3000 rpm. idles sweet rev to 3000 rpm then stops and backfires through intake and exhaust. car is not on gas so i replaced leads cap and rotor button and plugs. problem seemed to go away then came back. check exhaust was not blocked, checked fuel pressure on road test, checked map sensor pipe, checked for fault codes, checked for vacum leaks and timing( yes i know balencers spin and how to put it in diagnos mode).
any help or suggestions would be nice. thanks guys

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:26 pm 
Getting Side Ways
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cat could possibly be blocked.

 

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Posted: Wed Mar 19, 2008 10:27 pm 
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check the cat and also inspect for stuck valves

 

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Posted: Wed Mar 19, 2008 10:30 pm 
Getting Side Ways
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was going to say exact thing or the muffler box, mine had a crack the whole length and wouldnt rev past 2900rpm , ran like a dream till then then would cough and splutter and backfire

 

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Posted: Wed Mar 19, 2008 10:32 pm 
Stock as a Rock
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Location: melbourne
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its not a blocked cat cause i put my old cat on it and ran it straight out the back and bypassed the mufflers. it is an intermittant problem rans s**t most the time then occationly comes good. stuck valves is a possibilitly but dont think i will go that far a this stage.

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:35 pm 
Getting Side Ways
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does it only happen when cold?

 

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Posted: Wed Mar 19, 2008 10:37 pm 
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hot cold whenever i have been in the trade for almost 7 years and have never been this stumped

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:40 pm 
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did u check the coil?

hmmm does sound like an LPG thing but the cars not on LPG...

 

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Posted: Wed Mar 19, 2008 10:44 pm 
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was going to be the first thing i replace tomorrow. the thing is coils usually just plain outright fail. they dont usally go intermittant. should just put a set of coil packs in it like my ef that would fix it lol.

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:44 pm 
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Location: melbourne
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was going to be the first thing i replace tomorrow. the thing is coils usually just plain outright fail. they dont usally go intermittant. should just put a set of coil packs in it like my ef that would fix it lol.

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:44 pm 
Stock as a Rock
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Age: 33

Posts: 177

Joined: 9th Nov 2004

Ride: EF FAIRMONT

Location: melbourne
VIC, Australia

was going to be the first thing i replace tomorrow. the thing is coils usually just plain outright fail. they dont usally go intermittant. should just put a set of coil packs in it like my ef that would fix it lol.

 

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WOLF V500, t66(ar70 compressor), rochester 550cc injectors, borgg 265l fuel pump, 48mm turbosmart gate, turbosmart plumb back bov, 600x300x100 cooler, 3 inch zorst , 3.45 lsd, xr6 head, wade 1604 cam, adjustable cam gear, K&N pod filter, on 10psi and manual convertion exedy button clutch. 285.6rwkw

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Posted: Wed Mar 19, 2008 10:46 pm 
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lol triple post :P

the coil in my EA did it intermittently for about a week before it shat itself, it left me scratching my head thinking WTF lol

 

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Posted: Wed Mar 19, 2008 11:44 pm 
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How is fuel press. reg??? What is the fuel filter like????

 

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Posted: Thu Mar 20, 2008 6:27 am 
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my bro's r31 skyline did this turned out to be the result of super advanced timing and a dying crank angle sensor if that is any help
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Posted: Thu Mar 20, 2008 7:21 am 
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Well all the solutions here (especially) the sticking valves would likely fix the problem. But on a very off chance, it seems coincidental that it happens at 3,000rpm all the time, which is when the BBM changes. I'm not sure how the BBM could cause this problem, unless its badly damaged for some reason. Maybe unplug the connection to the bbm and see if it makes any difference. Like I said, its a long shot but only takes a minute to check.

 

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