Re: Bucking 4KCSQ Resets Clock!?

["Doyt W. Echelberger" <Doyt@nwonline.net>]

 Sent this to Peter:

>Peter.....My 86 4kcsq developed a tendency to buck after I swapped engine
blocks this year. I had put all the stock components back on the
replacement block, and had set all the ignition and fuel modules to what
the book called for. But is still bucked when I tried to hold a steady
speed on the straitaway.
>
>Tried lots of adjustments to the fuel system and injectors, all of which
helped but didn't totally solve the problem. Several injectors required
cleaning.  Started to get a handle on it by re-gapping the plugs, which
were new. Gapped them at 45 thousandths and the bucking almost totally went
away.
>
>This gave me a clue that my problem was somewhere in the ignition/timing
system. So I retarded the timing a few degrees and the entire bucking
episode was over.  Then I experimented with regapping the plugs back to
specifications, and had no problems. I think I ended up leaving the plugs
at 30 thousandths cold.
>
>This bucking episode taught me that my naturally aspirated stock I-5 is
not happy with stock timing settings, and requires fine-tuning of the sort
I describe above.
>
>Can't say it did anything to my clock, but maybe we are dealing with
different gremlins here.
>
>Keep us informed about your progress. I'd check my plug gaps first, regap
wide, and if that helped I'd retard the timing a few degrees.
>
>Doyt Echelberger
>86 4kcsq
>87 5kcstq
>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>At 11:12 AM 11/15/98 EDT, you wrote:
>>The other night while driving home in my '87 4KCSQ it started to buck.
>>Not hesitate but buck. Just once, every few minutes - randomly. The
>>strange thing is I noticed it reset the clock (computer) on the dash but
>>everything else seemed to be working normally. In fact there was no
>>light flicker or any other abnormal behavior - the LED's in the center
>>console didn't even blink and the radio continued to operate.
>>
>>I got home okay and the next morning I able to  get it started but
>>barely keep it running - so I drove my other '87 4KCSQ to work :-)
>>(always keep a spare Quattro on hand). Anyway, I got a chance to look at
>>the car last weekend and it started and ran fine! What gives? I started
>>driving it again but after a few days the same thing only much less
>>frequently.
>>
>>One last bit of info, I haven't had to put new gas in it since this
>>bucking started  - I don't know if that maters but I thought I'd mention
>>it.
>>
>>I look to the wisdom (and hard earned lessons) of the list.
>>
>>Cheers,
>>Peter
>>2 x '87 4KCSQ
>>
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