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Old 04-10-2010, 09:30 PM   #1
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Default NO POWER aka no ***** aka slower than ****

91 miata. 114k miles Manual ---also have this posted on miata.net
http://forum.miata.net/vb/showthread...91#post4467591
I am working on this car for someone locally

My issue is this car has zero *****, nothing. Start it up rev it up by hand under the hood and its so so slow to rev up. Pulled out of the drive way and floored it i drove 100ft before it actually hit 15mph.

THINGS IVE CHECKED:
The power loss seemed kinda gradual, started losing power over time then just one day went to complete crap. Thought it was the shortnose crank failure but that is not the case.
I have completely taken the front timing area apart after this sudden power loss started. Mechanical and ignition timing are dead on. The crankshaft is in solid shape and no pulley wobbling. New O2 sensor. Pulled cat off to check if its clogged and ran it with open header and got no change.

New O2 sensor
New fuel filter
throws #2 code NE SIGNAL


So not sure what else I should look at, prob going to test the fuel pump and compression tomorrow, was also curious about this thing here sometimes when started this little deal starts clicking like crazy and doesn't stop it appears to connect to the charcoal cannister.


Also curious can a bad TPS cause this sudden power loss as well? Any and all information/suggestions are greatly appreciated.

Last edited by crnrhrd; 04-10-2010 at 09:55 PM.
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Old 04-10-2010, 09:33 PM   #2
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Is there something lodged in the intake?
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Old 04-10-2010, 09:36 PM   #3
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Is it running rough at all in general?

If you've got proper fuel, and spark, and mechanical timing, then it sounds like an airflow problem. Maybe make sure the throttle body's actually opening?



EDIT: Is this only at WOT? If so I'd check out the TPS, but I forget what the thing even does, it's just a switch, but thought it was to tell when at idle or not.
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Old 04-10-2010, 09:36 PM   #4
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Intake is completely clear
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Old 04-10-2010, 09:36 PM   #5
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Quote:
Originally Posted by gospeed81 View Post
Is it running rough at all in general?

If you've got proper fuel, and spark, and mechanical timing, then it sounds like an airflow problem. Maybe make sure the throttle body's actually opening?
Idle is decently smooth and throttle body is opening like it should
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Old 04-10-2010, 09:37 PM   #6
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clogged cat? clogged something else? bad plugs? could be a shitton of things
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Old 04-10-2010, 09:41 PM   #7
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Quote:
Originally Posted by 18psi View Post
clogged cat? clogged something else? bad plugs? could be a shitton of things
As first post says, removed cat it's clear ran open header nothing changed. Plugs are good it doesn't misfire at all. You floor it and its weird its constant smooth acceleration (but slow as ****) hits 4 or 5k and it accelerates a little quicker but no where near like it should.
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Old 04-10-2010, 09:45 PM   #8
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maybe cas is fucked up and timing is retarded to ****?
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Old 04-10-2010, 09:46 PM   #9
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im pretty sure its fuel-related
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Old 04-10-2010, 09:49 PM   #10
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Quote:
Originally Posted by 18psi View Post
maybe cas is fucked up and timing is retarded to ****?
Timing is dead on 12 degrees
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Old 04-10-2010, 09:49 PM   #11
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Quote:
Originally Posted by UrbanSoot View Post
im pretty sure its fuel-related
Thats what I was kinda thinking, would a bad TPS do anything like this?
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Old 04-10-2010, 10:01 PM   #12
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Quote:
Originally Posted by gospeed81 View Post

EDIT: Is this only at WOT? If so I'd check out the TPS, but I forget what the thing even does, it's just a switch, but thought it was to tell when at idle or not.
Just noticed your edit if you don't go WOT the car goes nowhere, its really sad it's way slower than an automatic miata. Was wondering about the TPS as well.
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Old 04-10-2010, 10:09 PM   #13
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Check the flux capacitor connections.

Maybe the AFM has packed it in?
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Old 04-10-2010, 10:12 PM   #14
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Quote:
Originally Posted by saboteur View Post
Check the flux capacitor connections.
Checked and connections are solid, if I can't get this bitch up to 88 mph im going to be stuck in the future forever.
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Old 04-10-2010, 10:24 PM   #15
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Spark plug wires.
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Old 04-10-2010, 10:36 PM   #16
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If you don't WOT, but try and slowly/gradually add more throttle, does it respond better?

My coworkers volvo went super shitty, and I was looking at the fuel, fuel pump, fuel filter... Turned out the MAF wire had broken completely. Slowly adding throttle made it drivable, letting the o2 sensor have enough time to trim the fuel curve.
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Old 04-10-2010, 10:38 PM   #17
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Quote:
Originally Posted by bittetech View Post
If you don't WOT, but try and slowly/gradually add more throttle, does it respond better?

My coworkers volvo went super shitty, and I was looking at the fuel, fuel pump, fuel filter... Turned out the MAF wire had broken completely. Slowly adding throttle made it drivable, letting the o2 sensor have enough time to trim the fuel curve.
If you give it just a little throttle it goes no where, does not respond any better.
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Old 04-10-2010, 10:39 PM   #18
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Quote:
Originally Posted by curly View Post
Spark plug wires.
Wouldn't it misfire though?
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Old 04-10-2010, 11:13 PM   #19
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Random Idea: Have a compatible computer you could swap in?

Can you get an O2 reading?
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Old 04-11-2010, 12:01 AM   #20
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Can you borrow or access an automotive oscilloscope so you can determine if you have an ignition system issue (plugs, plug wires, coilpack, igniter)? Have you tried plumbing a mechanical fuel pressure gauge in before the fuel rail to see if fuel is a problem?
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