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Help ! No acceleration/ surging power/ rough idle.

Home-org Forums Nuts & Bolts Tinkering Help ! No acceleration/ surging power/ rough idle.

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    • Spectator

    Have a 1990 Miata and this spring when I took it out of storage from winter I have power and accelerate problems.

    Symptoms -Rough idle/ whole engine shakes. -Stalls at idle -loss of power, can’t get over 40mph, extreme loss of acceleration, shuttering/ surging power rpm’s jump all over and car jerks when trying to accelerate like someone is learning to drive stick.

    No codes or CEL

    List of parts I’ve replaced to try to fix or as regular maintenance recently :

    Currently 97,070 miles -Cleaned MAF -New Coil pack, PCV Valve, Spark Plug wires, Throttle Body and Intake Air Control Valve all replaced. -Spark plugs replaced at 96,881 -Fuel Filer replaced at 92,614 -Air filter at 89,751, Replaced MAF.

    What I’m thinking of replacing doing next: New Fuel Injectors New Fuel pump.

    Any help is appreciated, I don’t want to keep throwing parts at it and crossing my fingers. It’s getting too expensive.

    • Topics- 27
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    • Gear Head
    • ★★★

    I hate to even ask but did you try fresh gas and/or water remover?  This sounds like it might be something as simple as bad gas but it could be a number of things.

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    • Ace
    • ★★★★★

    Check the timing…and look at the crank pulley while it is running…is the crank pulley spinning straight and true?…the slightest bit of wobble at the pully is indication of a possible SNC problem…it is a 90, and that is a distinct possibility

    • Topics- 2
    • Replies- 4
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    • Spectator

    Will do the symptoms would make sence if it jumped a tooth and is off. I dont see any wobble, I’ve been pretty paranoid from the start about watching for the cursed crank wooble.

    • Topics- 2
    • Replies- 4
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    • Spectator

    Cant believe I didnt think of that, its simple and would make sence since it ran fine last fall and started out of the blue as soon as I took it out for the spring. I store it outside covered but I’m sure water can get in. Next day off I’ll drain my tank and change the fuel filter.

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