Question about 1992 Daihatsu Charade

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Engine Rev Surging

1.3L '93 HCE Charade (Injected), just done the head after blowing a gasket, done about a 100km perfectly, now engine is surging at Idle, speed of surge approx every second by about 400rpm at idle. does this sound like fuel flow problems? or the computer trying to compensate for something else. Didnt do Fuel filter yet, but this problem happened suddenly, not a gradual thing. Timing is bang on, plugs look good..... the engine is starting to push water out of the overflow bottle again tho :( so either retension tehead and hope for the best or rip it off and go again, but not sure this would cause the surging problem??

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  • markaallen Jan 11, 2009

    Thanks ChasDaihard, Had the head machined before I replaced the Head Gasket, but didnt bleed coolant from throttle body. Had another look at the car yesterday, as its not mine, and retorqued the head, doesnt seem to be blowing water, which it was only doing after a fairly long running time, e.g 30 mins or more, (Which could have been due to air expanding in throttle body?). Eng surging though stops once you disconnect the Throttle position sensor, just idles high, and seems to respond normally to accelorator movement, plug it back in, car starts surging. I disconnected the vacuum sensor mounted on the firewall and for a few seconds the car stopped surging, went normal, but as soon as I revved the car a little and it came back to idle, surging began again, then every other time you connect or disconnect it, surging doesnt change. Thanks again in advance....

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My charade surges when the water level is low. So if you didn't skim your head before torquing it down, you might not have sealed it properly, and water may be seeping out. Or it might just be a faulty radiator cap

Posted on Jul 05, 2011

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I think your gut feel may be correct. If you have overheated the engine before, it;s important to have the head skimmed prior to replacing the head gasket.

When you fill with coolant, it's important your bleed any air at the throttle body.

Posted on Jan 11, 2009

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