werid CIS-3 timing problem

[JShadzi at aol.com]

Interesting, yes, with the fuse in the ecu it is disabled from making idle and timing changes.  You say you don't have ANY codes currently?  have you tried setting the timing once it retards, typically timing is advanced when the car is "cold".

Javad

>Javad,
>
>Thanks for the advice. I'll start playing with the
>timing a little more.
>
>Last night I did a little more troubleshooting and it
>definitely seems to be jumping to different timing
>maps. I warmed up the car and drove around a little,
>checked the timing and it was retarded (> 0).  Waited
>a little while, restarted the motor (still warm) and
>it was at 6 BTDC ! Then drove it and it retarded
>again.
>These checks were with no fuse in the FPR.
>
>With the fuse in, the engine characteristics really
>change: Idle comes up and then stabilizes at 720rpm,
>timing stablizes at 6-7 BTDC and curiously the vacuum
>at idle _increases_ to 16 inches from 13 inches !
>
>Very weird stuff !
>
>
>--- JShadzi at aol.com wrote:
>> Well, one think you're finding is a quirk in the
>> CIS3 ignition system, yes, it does have different
>> maps for high and low octane (pinging or no
>> pinging), even the slightest pink will send the
>> ignition into the "regular fuel timing map", in
>> which all timing is retarded.  Restarting the car
>> probably solves your problem right?  That's becuase
>> each time you restart the car is begins in the
>> "premium ign. map" and the process starts over
>> again.  You should try retarding the timing another
>> degree or two and maybe richening up your CO a
>> little.  Another strategy is advancing the timing a
>> little so that when it does go into the regular ign.
>> map you'll have a higher base timing.
>>
>> Its kinda tricky, just keep playing around with it
>> and see what works for you, don't worry about a
>> little pinging here and there, these motors are
>> tough and can handle it for the most part.
>>
>> HTH,
>> Javad
>>
>> >
>> >Yup, done all that. Car warm, idle at 720 rpm,
>> mixture
>> >OK. I'll do more troubleshooting tonight and see
>> what
>> >I can find.
>> >
>> >
>> >
>> >--- JShadzi at aol.com wrote:
>> >> Make sure you set your timing with the car warm,
>> at
>> >> 800rpm,  and with the fuse in the FPR, have you
>> done
>> >> that?
>> >>
>> >> Javad
>> >>
>> >> >Hi
>> >> >
>> >> >I've run into a wierd CIS-3 ignition timing
>> problem
>> >> on
>> >> >my 90tq conversion. The thing is that when I set
>> >> the
>> >> >initial idle timing to 6-7 deg BTDC, after a
>> drive
>> >> >around the block it is retarded, I not sure
>> quite
>> >> how
>> >> >much, but at least 7 degrees.
>> >> >
>> >> >If I put in the fuse on top the fuel pump relay
>> as
>> >> the
>> >> >Bentley calls for (for checking idle timing) the
>> >> >timing comes back to 7 BTDC. Its like its
>> switching
>> >> >between timing maps or something !
>> >> >
>> >> >Any ideas on this one ? The car does at times
>> seem
>> >> >sluggish off idle as one might expect for
>> retarded
>> >> >timeing.  Other times it seems OK.  I should
>> >> mention
>> >> >this engine is 8.5:1 compression unlike the
>> stock
>> >> >10:1.
>> >> >
>> >> >Some other diagnostics. Idle is fine at 730 rpm,
>> no
>> >> >vacuum leaks, no knocks or pings, decent 91
>> octane
>> >> gas
>> >> >used, knock sensor seems OK, no error codes.
>> >> >
>> >> >=====
>> >> >-ed
>> >> >
>> >>
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>> >-ed
>> >
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>
>
>=====
>-ed
>
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