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Old 11-21-2008, 07:11 PM   #1
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Default 96 with 00 engine stuttering at 2200 rpm

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car is a 96 miata with a 00 engine in it (and 6 speed tranny). in neutral if i lightly press the throttle, it will hit 2200 rpm and keep bouncing between that and 2000 rpm, if i press on the throttle a bit harder it bounces faster. if i press past 50% it will rev like nothing is wrong all the way to the red line and does make good power.

in first gear if i press lightly on the gas it will hit 2000 rpm and lose power for a half second and then surge forward hard to the red line, usually getting my tires to slip for a second. less prominent in 2nd gear, and almost non-existent in 3rd gear and above. if i press the throttle harder it revs and doesn't have an issue.

Also has the issue of in higher gears of maintaining speed. if i press on the throttle below 25% it won't seem to maintain speed at all, but i can press a little harder and it will accelerate smoothly. so i can't maintain speed (only accelerate) until i hit about 60mph, then i can just fine.

i'm pretty sure this is a air to fuel metering issue, but don't know what to check or how to fix it. car has new plugs and wires, no vacuum leeks that i can find, with every vacuum hose replaced. electrical system is from the 96, injectors from 00, with the m-tuned duel feed fuel rail. also has a 1.6l clutch and flywheel (fidanza).

any ideas?
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Old 11-21-2008, 07:34 PM   #2
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update, unhooking the TPS completely eliminates the issue. but then the car idles at 1600rpm. could this mean that the TPS is bad? or is it hooked up wrong?
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Old 11-21-2008, 07:55 PM   #3
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tps is might just need to be adjusted
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Old 11-21-2008, 08:03 PM   #4
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Yeah, probably needs to be adjusted. Is the 99 TB/TPS being used? I wonder if the 94-97 TB is the same as 99+? If you can't figure specs on how to adjust it, search around miata.net in the garage section, and also on the forum there. I'm sure it's covered somewhere, if not here.
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Old 11-21-2008, 08:06 PM   #5
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I'm using the 94-97 TB and TPS. i've got the factory service manual along with the enthusiast manual, i'll head out and give a shot to adjusting it, might not be able to do it until tomorrow morning though.
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Old 11-22-2008, 04:49 PM   #6
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my TPS sensor wasn't properly adjusted. adjusting it fixed the issue completely. the problem is that while i adjust that, i noticed the CPS wasn't properly gapped, so while doing that i snapped the bolt that holds it on in half..........so now i have to remove the sway bar and radiator to get enough clearance to use a drill with a screw extractor............fun
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