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'86 Brat (non-turbo) sudden rpm surge at start
Posted 20 November 2006 - 11:49 AM
Since: Same starting procedure, but the engine will only rev to 1.5 or so, and then die unless I press the accelerator to hold the revs above 1.2 or so. After 20-30 seconds I can let off the accelerator and the car will hold idle on it's own. If I pull away before it warms up to the point it drops to normal idle, it drives fine, no hesitation.
Last night: Same starting procedure. Gave it some gas, turned the key, and...
Immediately jumped to 5500 for a couple of seconds, and just as quickly to 0 and died. I sat there for a few seconds wondering if I had just killed the engine, then tried again. This time it went to 3500 or so, then came down to a more normal warming up rev, except, about more times before it warmed up and dropped to a normal idle, it jumped to 5500 again for a second or two (I may have felt/heard a click right before, but I'm not sure), and then dropped to where it was before the surge (but didn't drop to zero and die). I drove it a couple miles to a friends house, spent 2.5 hrs there, then started it up again to drive home. Started normal, drove fine, until a mile or two later when it suddenly surged to 4000 for a second or two while in gear (the car didn't jump forward though), and that was it until I got home (which was a mile or so later).
My mechanic has no idea what the issue is, but I'm going to drop it off in a bit here. He'll keep it overnight and look at it in the morning when it's cold, but I thought in the meantime I'd try posting here to see if anyone has any idea what may be the problem.
Posted 20 November 2006 - 12:51 PM
Posted 20 November 2006 - 03:53 PM
The throttle cable may be frayed at the end and getting stuck. The throttle plates may be getting hung up too due to worn throttle shafts. or there is some wierd vacuum leak.
it may help to halve someone operate the thottle while your looking at the linkage and such.
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