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> 74 2.0L, bizarre behavior
Java2570
post Aug 27 2011, 05:28 PM
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I'm back with more questions re: my 1974 2.0L. Since replacing my distributor contact plate (bad ground wire) I've had issues with how the car runs and idles. Currently, I've put back in the old contact plate and tried to back track through every thing I've taken
apart, etc. I have replaced the intake runner boots and gaskets also. I just replaced the AAR valve with a known good one. As of today, the car will start and seem fine for about 1-2 minutes, then it starts running rougher and dies altogether. When I attempt to restart it, it refuses to start, like it's flooded. What I at first thought was a lean mixture problem now appears to be a rich mixture issue. I forgot to mention that I've also replaced the CHT sensor with a new one from PP, it's a 012. I am only getting a reading of about 1.3K cold (sensor alone) and about 1.8K cold with the ballast resistor that came with the wiring. I know that is lower than it should be.... I haven't been able to get the car warmed up enough to check the warm temp resistance.
I checked my MPS today and it seems to hold vacuum but I've not checked the unit
with a meter yet. Can I do this without testing through the harness via ECU? Would a bad MPS cause a scenario such as I'm having? I have also wondered if the injector seals are leaking vacuum; I see no problem with fuel leakage anywhere. I did find a couple of bad wire connectors today so perhaps in all my messing with the dizzy, I caused an issue with a wire. Prior to all of this, the car was actually running pretty well and it didn't seem to have a major issue save for a few slight vacuum leaks with hoses. Sorry if this is long winded and perhaps hard to follow but am I missing anything that could be an issue? I really thought it was either the AAR or CHT that was causing my running problems but now I've seemed to have made it worse and it's driving me crazy!! Any other ideas? Thanks!
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Java2570
post Sep 3 2011, 02:12 PM
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Hi everyone - just wanted to make mention that my car is now running quite well after being down for 2-3 weeks with assorted issues. I found the CHT sensor that I had gotten from PP was reading low value when installed in the head and while the car was running, it would flood and die after a few minutes. What I think was the problem in reality was that sensor was not properly seated in the head and was making the mixture ultra rich and flooding. After installing a new sensor and making sure it was all the way in, I was able to start my car and actually drive it! I also found that I have at least one bad or marginal relay on my relay board. I was able to swap out the ones from the headlights and I bought some new ones to replace all of them. I am now able to adjust my idle like normal and things seems good. The only issue I have now is the vacuum canister is leaking; doesn't hold vacuum well on the retard side. I have the line from the throttle body plugged now; should i try to replace the can? I've read varying reports of it helping fuel economy and idle reliability. Thoughts? Also, for what it's worth, I did all this myself without coming here and asking more dumb questions. I just kept reading my manuals and looking at the Anders website to gain more knowledge about the Djet components. It has been frustrating but a good learning experience!
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