crnrhrd

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.

kotomile

iTrader: (24)

Is there something lodged in the intake?

gospeed81

iTrader: (51)

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.

crnrhrd

Intake is completely clear

crnrhrd

Idle is decently smooth and throttle body is opening like it should

18psi

iTrader: (76)

clogged cat? clogged something else? bad plugs? could be a shitton of things

crnrhrd

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.

18psi

iTrader: (76)

maybe cas is fucked up and timing is retarded to ****?

UrbanSoot

iTrader: (24)

im pretty sure its fuel-related

crnrhrd

Timing is dead on 12 degrees

crnrhrd

Thats what I was kinda thinking, would a bad TPS do anything like this?

crnrhrd

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.

timk

Check the flux capacitor connections.

Maybe the AFM has packed it in?

crnrhrd

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.

curly

iTrader: (25)

Spark plug wires.

gooflophaze

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.

crnrhrd

If you give it just a little throttle it goes no where, does not respond any better.

crnrhrd

Wouldn't it misfire though?

oilstain

Random Idea: Have a compatible computer you could swap in?

Can you get an O2 reading?

sn95

iTrader: (2)

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?