I've recently overheated my Jeep due to a faulty thermostat, which blew my orig. radiator. I've replaced the radiator and the thermostat and low and behold the Jeep still doesn't run correctly.
Symptoms: It will start and idle pretty smoothly, but as soon as I drop it into drive it shakes and runs really rough as if the gas mix isn't correct. If I floor it there is large delay in the power or acceleration of the vehicle. If I come to a stop in drive it will nearly stall out, but as soon as I drop it into neutral the rough idle quits and smooths out, then back into drive and it's all over again. When I push the gas in neutral it seems to rev correctly. Does anyone have any ideas as to what could be/is going on? If you have any suggestions please include novice directions as how to test or correctly diagnose...Thanks a million.1998 Jeep Grand Cherokee Issues: Need Advice/Help?
the overheat may have damaged the coolant temp sensor... or worse case senario warped a cylider head..1998 Jeep Grand Cherokee Issues: Need Advice/Help?
Don't know the cure for the Jeep but the symptoms are that of incorrect timing.
Seems like it just acts up under load conditions, which could indicate a number of things.
Serious overheating could destroy the plugs, and also could warp some of the valves. Either of these conditions could give the results you now experience.
Pull all of the plugs, and get ready to replace them, while they're out, check compression on all cylinders. The compression check should tell you if the valves are burnt or shot.
This is also an indication of possible spark wire shorting to ground, best way to check them is at night, have someone power brake the vehicle, while watching under the hood, if the wires are shorting the spark will be visible.
A bad overheating will also blow head gaskets, but that usually is a constant miss, not just under power.
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