First of all, thanks to all for the suggestions. What a great group!
Datsunmike gets the prize for pointing specifically at the points. Several
others suggested various parts of the ignition, which got me to examine that
pretty closely, even though most of the parts had been replaced within the
last 500 miles.
After swapping out the condenser, coil, plug wires, rotor and distributer
cap I was getting ready to swap out the points. I had checked the gap
before, which was ok and they were not worn at all. But I did notice a filmy
residue on them. I got out the ohmmeter and read 10 ohms across them when
they should have been shorted. Sanded them with some 1500 grit and tried
again. Ran great! I still don't know why they would develop the film after
so few miles.
Took it out for a test drive and got pulled over by the local cop for going
15 over the speed limit. I was surprised when the cop said a couple of times
"What a nice car". I apologized pretty good and told him that I had spent
quite a bit of time over the weekend because it ran like crap and I got
carried away on the test drive. Anyway, he let me go.
So the day ended on a happy note.
Once again, thanks to those who helped me out on this one.
Steve
>From: "steve car" <steve_car@hotmail.com>
>To: steve_car@hotmail.com, datsun-roadsters@autox.team.net
>Subject: Re: Backfire problem
>Date: Sun, 22 Oct 2000 04:57:52 GMT
>
>A couple more things: It seems to be backfiring at the carbs most of the
>time verses at the exhaust pipe. But I am not sure it is actually the carbs
>but it seems like it.
>Also, it doesn't run quite right when I give it some gas and before it
>starts backfiring.
>I just noticed that I didn't mention that the tube with the screw is at the
>intake manifold that used to go to the smog stuff. I already have the
>nonemission distributer installed.
>Thanks again,
>Steve
>
>
>>From: "steve car" <steve_car@hotmail.com>
>>Reply-To: "steve car" <steve_car@hotmail.com>
>>To: datsun-roadsters@autox.team.net
>>Subject: Backfire problem
>>Date: Sun, 22 Oct 2000 02:44:28 GMT
>>
>>I was out today and all of a sudden my 69 1600 started backfiring like
>>crazy
>>when I gave it gas. This happens during acceleration and a constant medium
>>speed. It ran good at idle and low speeds though. One thing I noticed was
>>that my tube with the screw in it had popped off. But it did not solve the
>>problem when I put a new one in.
>>
>>Timing is ok, fuel level in carbs is ok, vacuum advance mechanism moves
>>when
>>I suck on it. Points, plugs ok. Choke is not stuck. I tried looking for
>>manifold leaks with no luck. Maybe I am doing it wrong though. I sprayed
>>some carb cleaner at all gaskets and throttle area without noticing any
>>stumbling. This was done at idle.
>>
>>I am out of ideas. Does anybody have any suggestions? How do you determine
>>for sure if it is fuel or ignition?
>>
>>Thanks,
>>Steve
>>_________________________________________________________________________
>>
>>
>
_________________________________________________________________________
|