weird power loss, intermittent
11-28-2009, 08:27 PM
#1
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weird power loss, intermittent
okay, here is my history! new engine not even 1k! new tranny! new plugs/coils/wire
mazdaspeed CAI/ obx headers/ r1-t exoticspeed 3in cat-back/AP pulleys!
ok here is my problem! its intermittent! on idles = perfect if i push rpm to 9k on neutral everything is fine! now if i push rpm in gears pass 7k it makes a weird noise, like a ratteling coming from the engine( not great at all)+ loss power over 7k through 9k, very bad noise from engine!
runs very good apart that, starts on 1/4 turn even in cold temp! idles great all the time, no grinding noise at all from engine! i checked the headers gasket...
here is my thought! they said at the dealer that my old intake manifold had a problem( clickling noise in the intake) so i went to the scrap ward and got a use intake manifold!
is there possibility that something is obstructing the variable intake system ? cause it sound like when i rev from 7k to 9k something is obstructing somewhere
mazdaspeed CAI/ obx headers/ r1-t exoticspeed 3in cat-back/AP pulleys!
ok here is my problem! its intermittent! on idles = perfect if i push rpm to 9k on neutral everything is fine! now if i push rpm in gears pass 7k it makes a weird noise, like a ratteling coming from the engine( not great at all)+ loss power over 7k through 9k, very bad noise from engine!
runs very good apart that, starts on 1/4 turn even in cold temp! idles great all the time, no grinding noise at all from engine! i checked the headers gasket...
here is my thought! they said at the dealer that my old intake manifold had a problem( clickling noise in the intake) so i went to the scrap ward and got a use intake manifold!
is there possibility that something is obstructing the variable intake system ? cause it sound like when i rev from 7k to 9k something is obstructing somewhere
11-28-2009, 08:42 PM
#5
The actuator is at the top of the manifold, check it with a vacuum pump and see if it holds vacuum.
The solenoid is almost in front of the oil filter.
When you remove the upper intake manifold you'll see three solenoids stacked on top of each other.
The top is the AIR, the middle is the SSV, and the bottom is the VDI.
Swap the AIR and VDI to see if the sound goes away.
The solenoid is almost in front of the oil filter.
When you remove the upper intake manifold you'll see three solenoids stacked on top of each other.
The top is the AIR, the middle is the SSV, and the bottom is the VDI.
Swap the AIR and VDI to see if the sound goes away.
11-28-2009, 08:55 PM
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i have to say that my air is no longer in fuctuin as i have obx headers! i left the secondary air pump unplugged! but that is not the problem!
so i do need to remove the manifold to switch these solenoid?
so i do need to remove the manifold to switch these solenoid?
11-28-2009, 08:59 PM
#8
I've heard that some people can do it without removing the UIM, but I couldn't do it.
And don't bother moving the whole solenoids, just swap the vacuum lines and wire harness between the AIR and VDI solenoid.
Also don't rule out the actuator.
If it has a pinhole, it can't maintain vacuum and the valve can't open completely.
And don't bother moving the whole solenoids, just swap the vacuum lines and wire harness between the AIR and VDI solenoid.
Also don't rule out the actuator.
If it has a pinhole, it can't maintain vacuum and the valve can't open completely.
11-29-2009, 12:02 AM
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okay, here is my history! new engine not even 1k! new tranny! new plugs/coils/wire
mazdaspeed CAI/ obx headers/ r1-t exoticspeed 3in cat-back/AP pulleys!
ok here is my problem! its intermittent! on idles = perfect if i push rpm to 9k on neutral everything is fine! now if i push rpm in gears pass 7k it makes a weird noise, like a ratteling coming from the engine( not great at all)+ loss power over 7k through 9k, very bad noise from engine!
runs very good apart that, starts on 1/4 turn even in cold temp! idles great all the time, no grinding noise at all from engine! i checked the headers gasket...
here is my thought! they said at the dealer that my old intake manifold had a problem( clickling noise in the intake) so i went to the scrap ward and got a use intake manifold!
is there possibility that something is obstructing the variable intake system ? cause it sound like when i rev from 7k to 9k something is obstructing somewhere
mazdaspeed CAI/ obx headers/ r1-t exoticspeed 3in cat-back/AP pulleys!
ok here is my problem! its intermittent! on idles = perfect if i push rpm to 9k on neutral everything is fine! now if i push rpm in gears pass 7k it makes a weird noise, like a ratteling coming from the engine( not great at all)+ loss power over 7k through 9k, very bad noise from engine!
runs very good apart that, starts on 1/4 turn even in cold temp! idles great all the time, no grinding noise at all from engine! i checked the headers gasket...
here is my thought! they said at the dealer that my old intake manifold had a problem( clickling noise in the intake) so i went to the scrap ward and got a use intake manifold!
is there possibility that something is obstructing the variable intake system ? cause it sound like when i rev from 7k to 9k something is obstructing somewhere
11-29-2009, 12:04 AM
#13
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1. Check all your vac lines are installed right to the intake or capped off.
2. When you installed the AP under drive pulley did you mark the plate thats right behind it? if you intsall the plate wrong=back wards or upside down, your e shafe sencer will throw a cel.
3. Compression test. When I lost my first engine thats what it was doing till I ran it on the freeway and went into limp mode. Could not get past 3k or 4k rpms.
4. Colgged cat?
2. When you installed the AP under drive pulley did you mark the plate thats right behind it? if you intsall the plate wrong=back wards or upside down, your e shafe sencer will throw a cel.
3. Compression test. When I lost my first engine thats what it was doing till I ran it on the freeway and went into limp mode. Could not get past 3k or 4k rpms.
4. Colgged cat?
Last edited by @!!narotordo; 11-29-2009 at 12:06 AM.
11-29-2009, 01:11 PM
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i dont know much about this engine! i checked under the hood and all lines seems ok connected 
**** i dont know whats wrong! it might be the intake??? but how to trouble shoot it??? i dont know much
**** i dont know whats wrong! it might be the intake??? but how to trouble shoot it??? i dont know much
11-29-2009, 11:09 PM
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i read about the VDI and is it right that this valve opens at 7200rpm?
because my loos of power begins exactly at 7200rpm, feels like there is not enough air coming in, the rpm want to go up but it seems hard to! it feels like no sucking enough air.....
is this a commun problem these solenoid to fail? i will check the MAF wires tomorrow, thanks
because my loos of power begins exactly at 7200rpm, feels like there is not enough air coming in, the rpm want to go up but it seems hard to! it feels like no sucking enough air.....
is this a commun problem these solenoid to fail? i will check the MAF wires tomorrow, thanks
11-29-2009, 11:15 PM
#20
The solenoids (AIR, SSV, VDI) have been known to fail.
Sometimes its not the actual solenoid, but the wire harness that connects to them get tarnished from weathering/poor seal.
Sometimes just simply cleaning the contacts in the harness and solenoid have corrected the issue.
Last edited by Jon316G; 11-29-2009 at 11:18 PM.
