Need help. Power loss.
08-21-2010, 06:18 PM
#41
Let it idle and disconnect and reconnect each coil pack one by one. If you don't notice a diff when disconnecting one or more of the coil packs, then that is the cylinder you should focus on -- e.g. bad coil pack, fouled spark plug, miswired, ect.
09-05-2010, 11:59 PM
#45
Update:
The Z has been in the dealership for a week... Been getting the runaround from them, from day 1.
Anyway, they wanna start with the plenum spacer, thinking the vacuum leak is coming from there... ok, whatever... even though I already told them that's not where the problem is... So they order the OEM manifold bolts... I get told 2 different stories about the bolts being in, and the mechanic not coming to work, and the bolts are still on order, and they don't understand why I'm upset.
Anyway, they called yesterday to say the problem was not the spacer... Gee... where'd I hear that before?? So now they're trying to look at my other aftermarket parts... Let's see how long and drawn-out this takes...
The Z has been in the dealership for a week... Been getting the runaround from them, from day 1.
Anyway, they wanna start with the plenum spacer, thinking the vacuum leak is coming from there... ok, whatever... even though I already told them that's not where the problem is... So they order the OEM manifold bolts... I get told 2 different stories about the bolts being in, and the mechanic not coming to work, and the bolts are still on order, and they don't understand why I'm upset.
Anyway, they called yesterday to say the problem was not the spacer... Gee... where'd I hear that before?? So now they're trying to look at my other aftermarket parts... Let's see how long and drawn-out this takes...
09-07-2010, 08:04 PM
#48
Update:
Ok, so Nissan fixed the vacuum leak... make that vacuum leaks. apparently I had a leak at the plenum spacer, as well as under the MREV2, at the gasket there. Nissan charged me for reverting everything back to stock, and everything is fine now.
The power loss is due to a bad fuel pump... they said at idle my fuel pump should be at 51 psi. Mine is currently at 4 psi... So, they are ordering the pump, and I should have the Z back this weekend, hopefully.
Grand total for everything ~$2300
Ok, so Nissan fixed the vacuum leak... make that vacuum leaks. apparently I had a leak at the plenum spacer, as well as under the MREV2, at the gasket there. Nissan charged me for reverting everything back to stock, and everything is fine now.
The power loss is due to a bad fuel pump... they said at idle my fuel pump should be at 51 psi. Mine is currently at 4 psi... So, they are ordering the pump, and I should have the Z back this weekend, hopefully.
Grand total for everything ~$2300
09-08-2010, 05:20 AM
#52
So in reality, they charged you $2300.00 to diagnose a bad fuel pump...
The reason I say that is, the air leak from the modded parts would have made the idle bad and threw a code at most (considering it wasn't massive). 4 psi at idle is no doubt a bad fuel pump and shouldn't have taken a tech more than an hour or two to figure out. Man... even an air leak in the intake system shouldn't have taken more than two hours labor.
That is crazy, I would ask them for an invoice on the labor and run it by a local shop. If the local shop feels that the labor was crazy raise a fuss.
The reason I say that is, the air leak from the modded parts would have made the idle bad and threw a code at most (considering it wasn't massive). 4 psi at idle is no doubt a bad fuel pump and shouldn't have taken a tech more than an hour or two to figure out. Man... even an air leak in the intake system shouldn't have taken more than two hours labor.
That is crazy, I would ask them for an invoice on the labor and run it by a local shop. If the local shop feels that the labor was crazy raise a fuss.
09-08-2010, 05:44 AM
#53
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I was just gonna say ^ in the end you paid $2,300 for a fuel pump that could have been an easy DIY for less than $300 new. You should definitely consider taking this up with the managers.
09-08-2010, 09:03 AM
#55
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I had the same problem with a buddies 350Z, we did a service on his Z (it had about 115,000 miles on it) and looked like it never had a service. We cleaned his Nismo cold air intake(Was really dirty), did an oil and filter change, replaced spark plugs and belts and put everything back together. Then the same thing happened. Took everything apart and put it back together several times just like you did..We took it to a local shop and they couldn't figure out what was wrong, finally took it to Nissan and it was the fuel pump. (took them about a week to figure that out). We replaced the fuel pump and then BAM! She ran like a champ..that was about 8 months ago and hasn't had a problem since. I'm not sure how it happens like that..maybe some signal was sent asking for more fuel to be pushed all of a sudden after the service and the fuel pump couldn't handle it..so it failed.
09-08-2010, 09:30 AM
#56
So I fix that. Car was running bad the other night and I checked. The bolt was up about .25" and the coil pack was loose. I pushed down and it clicked. The bolt was tight but not down. I removed it to make sure it wasn't cross threaded and it wasn't. I just had to really tighten it to get it down. Now, the car runs strong but I want to try resetting everything because I never knew there was a reset on the exhaust valve timing for the revup.
