Did it ever run properly? What changed between then and all the stuff you've
done attempting to resolve the issue?
I would first verify the thermostat, water temp and oil gauges are working
properly. You wouldn't be the first one to install a new, faulty thermostat.
If those check out, then I'd be wondering about the one thing you haven't
mentioned; electricity, i.e. the ignition and/or wiring. Is there something
close enough to the exhaust manifold that might cause a problem once it
heats up, i.e. after 45 minutes or so?
Pete
-----Original Message-----
From: owner-datsun-roadsters@Autox.Team.Net
[mailto:owner-datsun-roadsters@Autox.Team.Net] On Behalf Of Charles Kyle
Sent: Wednesday, July 11, 2007 11:22 AM
To: datsun-roadsters@autox.team.net
Subject: 68 Datsun Problems
I have a 68 1600 R16 engine.
The car runs good for 45 minutes or so. Then it begins to backfire. This
backfire is toward the manifold or carbs not through the tailpipe. If I am
going 45 mph and it begins to backfire, no matter how much or how little
throttle I give it it continues to backfire and rolls to about 5 MPH. At
this point it has NO power what so ever. I can stop the car and wait 20 or
30 minutes, it will start and then go for a little while and do the exact
same thing. So here is what I have had done so far:
1.) Replaced thermostat and radiator
2.) Engine rebuild
3.) Replaced carbs (from Z-Therapy)
4.) Replaced fuel pump, fuel line and fuel tank
Conditions that occur each time:
1.) Temp gauge goes to 220
2.) Oil Pressure gauge starts to look like a tach, jumps from 20 to 40 and
then to zero. While it is backfiring and you are giving it gas, the oil
press gauge moves up and down the way a tach would do it.
3.) Backfires
4.) Engine is on but the car has NO power.
Observations:
1.) There is NO steam or overheat conditions at the radiator that would
suggest that it is over heated, no antifreeze in the oil
2.) No oil leaks
Any suggestions would be greatly appricated.
Chuck
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