Jez <jeremy@ainsworth.me.uk> wrote in
news:7N-dnU9PlM3BiNDeRVnyuQ@pipex.net:

> TeGGeR® wrote:
>> Jez <jeremy@ainsworth.me.uk> wrote in
>> news:WfmdnbII9c_9QNHenZ2dnUVZ8qudnZ2d@pipex.net:
>>
>>
>>>Hi chaps,
>>>
>>>96 Civic, 78,000 miles, automatic transmission.
>>>
>>>I posted about this a few weeks ago. The RPM on my civic is
>>>hunting/oscillating by +-200 when driving at roughly 35mph up a light
>>>hill with the correct throttle position to maintain that speed. It's
>>>indicated on the gauge, by changing engine sound, and by very gentle
>>>thrusting forward whenever the RPM increases. Imagine the RPM needle
>>>going up and down about once or twice per second.
>>>
>>>Curly advised checking the TPS (no problem found) and using injector
>>>cleaner which I've done. jim bean suggested checking the ECU codes
>>>but nothing was stored.
>>>
>>>Does anybody else know what might be causing this problem?
>>
>>
>>
>>
>> At this point it sounds like misfiring under load, usually ignition
>> related. Most engine problems are due to ignition, not fuel.
>>
>> Your OBD-II system *should* set an error code if that's the case.
>>
>> Do you have EGR? Your under-hood sticker will say so if you do.
>>
>> How old are your plug, plug wires, distributor cap and rotor. Do you
>> have any aftermarket parts?
>>
>>
>>
> Hi TeGGeR®, thanks for replying
>
> There is no EGR noted under the hood. I've also checked the Haynes
> manual which states EGR is only on D15Z3, D15Z6, D15Z8 and D16Y5
> (mine's a D14A2).
>
> I'll ask specifically for an ODB-II scan at the local service station.
>
> The plugs are new, I replaced them on schedule last week with Bosch
> Super-4's (recommended by the store). There were NGK's in there
> beforehand. Changing the plugs hasn't solved or changed the situation.
>
> As far as the plug wires are concerned, I tested their resistance and
> all are below 25KOhms (12,10,8,7 longest to shortest).



Resistance to a tiny test current means nothing if they're leaking HT
current to ground due to old insulation.

If they're OEM, there will be a date printed on them. Go check.



> I don't know
> when they were last replaced. No record so maybe never. Again, not
> sure when the cap and rotor were replaced. I inspected the cap but I
> should look at the rotor in this case.
>


Prime culprits for your problem.

--
TeGGeR®

The Unofficial Honda/Acura FAQ
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