If someone can help, I would appreciate it.
Case in point:
1987 Nissan 300ZX 2+2 GLL Auto-->5spd conversion.
Problem at hand:
During random times whether it is around my neighborhood, or during highway travelling, with speeds excessive if you catch my drift. I get a popping sound through the exhaust like backfiring (only on downward rpms), I try and give it some gas and it starts to bog down and I go from 65 to 45 and then all the sudden it revs back up for a bit and then it does it all over again. BUT, I sometimes can work past it by stomping it and passing 65mph and have a 50/50 chance of the problem reoccuring. Also when the backfiring happens, if I was to stop, the idle would reach 0 and kill the motor.
If it happens when I am near my house, I make it home carefully and park it. About 2-3 hours later, it starts up no problem, and idles decent about 700-750.
Vacumm readings during normal idle show steady 25 or 26.
During the freak show of embarassment 20 through 27.
Fuel readings read on both normal idle and wierd idle 25-27psi, if I pull the vacumm line off the FPR, it hits 40psi. I have a summit inline FPG.
Items I have installed or replaced since I bought my Z a year ago.
BRAND NEW CHTS and Harness
NGK sparkplugs
Nissan rebuilt Distributor
NUsed FPR (looked new)
NUsed Air regulator on side of intake
Cone filter and all elbow are connections tight
NUsed TPS (connection tight)
NUsed AFM (connection tight)
Cap & rotor
All vacumm lines
New alternator
New battery and terminals
Ford taurus cooling fan w/ adjustable thermostat
O2 sensor
Auto to 5spd swap
and more http://www.cardomain.com/ride/2272864/4
I tried running codes, but the results I get do not match the results that everyone tells me I should see.
When she runs good, man she runs real good, when she is bogging, she runs like crap.
Case in point:
1987 Nissan 300ZX 2+2 GLL Auto-->5spd conversion.
Problem at hand:
During random times whether it is around my neighborhood, or during highway travelling, with speeds excessive if you catch my drift. I get a popping sound through the exhaust like backfiring (only on downward rpms), I try and give it some gas and it starts to bog down and I go from 65 to 45 and then all the sudden it revs back up for a bit and then it does it all over again. BUT, I sometimes can work past it by stomping it and passing 65mph and have a 50/50 chance of the problem reoccuring. Also when the backfiring happens, if I was to stop, the idle would reach 0 and kill the motor.
If it happens when I am near my house, I make it home carefully and park it. About 2-3 hours later, it starts up no problem, and idles decent about 700-750.
Vacumm readings during normal idle show steady 25 or 26.
During the freak show of embarassment 20 through 27.
Fuel readings read on both normal idle and wierd idle 25-27psi, if I pull the vacumm line off the FPR, it hits 40psi. I have a summit inline FPG.
Items I have installed or replaced since I bought my Z a year ago.
BRAND NEW CHTS and Harness
NGK sparkplugs
Nissan rebuilt Distributor
NUsed FPR (looked new)
NUsed Air regulator on side of intake
Cone filter and all elbow are connections tight
NUsed TPS (connection tight)
NUsed AFM (connection tight)
Cap & rotor
All vacumm lines
New alternator
New battery and terminals
Ford taurus cooling fan w/ adjustable thermostat
O2 sensor
Auto to 5spd swap
and more http://www.cardomain.com/ride/2272864/4
I tried running codes, but the results I get do not match the results that everyone tells me I should see.
When she runs good, man she runs real good, when she is bogging, she runs like crap.
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