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1999 Mazda Protege Question: Rough idle and bad acceleration when warm, stalls while idling at light.

 

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Sachico, 1.8L 4 Cylinder, Buffalo, NY, August 02, 2013, 15:21
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This first started after an alternator problem. While driving, I noticed that the battery light was on and I was losing power to all electrical systems. By the time I got to the shop the car was barely drivable; It wouldn't shift gears, it was revving up and down randomly, lights and turn signals were not working correctly, and so on.. After we replaced the alternator I first thought that all of the problems were fixed. However, after about 1 minute of driving, the car would idle dangerously low while waiting at intersections and occasionally stall. After a cold start in the morning, it would run fine for about 2 minutes until it warmed up, and then the problems would start again. Symptoms are almost identical to those in this post: http://repairpal.com/rough-idle-bad-hesitation-on-acceler...

That problem was solved by replacing the distributor cap. However, to my (very limited) knowledge, the 99 Mazda protege does not have a distributor. Please correct me if I'm wrong, but if I am not, I have no clue where to start.

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  • Answer #1

    pushrod August 02, 2013, 17:21
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     Master

    How much or how far has it been driven since the battery power was lost/disconnected? It may just need to relearn idle strategy . Try letting it idle for awhile, then drive it, should take care of itself. (Possible)
    Check engine light on?

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    Sachico, August 02, 2013, 19:16
     Rookie

    Ok I'll leave it on for a while tomorrow morning. I drive it for no more than 10 minutes total around town since I replaced the alternator, no changes yet. And no, none of the dash lights are on.

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    pushrod, August 02, 2013, 19:23
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     Master

    No light on is good ! Idle relearn might just take care of this. If not, possible vacuum leak, hose could have been knocked loose.

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    Sachico, August 03, 2013, 08:50
     Rookie

    Let it idle this morning for about 15 minutes. Before I left, I revved it up to about 2000-2500 rpm and back down, no problems. But after about a minute of driving it started again. It's very weird; it only has this problem about half the times I stop. Sometimes I stop at a light and its running perfectly. Other times I have to keep my foot on the pedal to prevent it from stalling.

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    pipinl, December 10, 2013, 16:59
     Rookie

    Hello,
    I am dealing with the same issue with my Mazda Protege right now (starts/drives fine until it's warmed up, then at intersections it bogs down sometimes stalling out etc.). Ever figure out what was causing this? Thanks!

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