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I have a 79 Dodge 440 that has been hesitating going uphills. It seems to run ok on flat streets for awhile but not uphill. I have replaced the Thermoquad carb. the flue pump and filters the PCV valve the dist. vacumn valve and the vacumn relay and both charcoal canisters and the spark plugs. I have changed out the gas thinking it was a bad batch but I've run out of ideas. Any Help would be great.
I pulled the plugs and put them at 25
It also struggles on the freeway after it warms up. It is running at normal temp.I have replaced some of the smog thinking that was it. Any other ideas would be great!!
When you say it "struggles" do you mean it lacks power? You also state that it seems to run OK, (doesn't struggle), until it warms up. That's when several things happen, the choke opens, the secondaries lock-out is disabled, and EGR action is enabled. It's easy enough to check the secondaries under load. Remove the engine cover and air filter, plug the heated air control vacuum hose, have someone drive the rig while you watch the secondary air valves in the carb. If power /engine speed doesn't increase as they open, then there is no fuel being supplied by the secondaries. If that checks out OK, then disconnect and plug the hose at the EGR valve and see if performance improves. If all externals are working OK, then it might be camshaft timing. To check this you need the valve timing specs. Then it's just a matter of removing a rocker arm cover and turning the engine over slowly while comparing the valves opening and closing in relation to crankshaft position. Some of the Chrylser harmonic balancers would suffer "creeping" of the inner and outer portions due to aging of the rubber that joins them. Because the timing marks are on the outer portion, you'd lose your timing index. Check these out and then come back with your findings.
What I mean by struggles is that after it is warm the engine hesitates, coughs and sometimes backfires. Stutters is probably more like it. I have recently heard that there were problems about the dist. I am checking on that. It seems as if something is choking the engine and not letting it run properly.
Thanks for the recent information. |
RV and bus conversion info since 1996.
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