Bronco II engine power loss when hot.
- Thread starter jafo2k
- Start date
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yusuebronko2_86
New member
first off, I would start with a colder thermostat to keep the engine's temperature just above the lower line of the NORMAL lettering, and then move on to a better exhaust system to expell the heat faster and more efficiently, so the motor doesn't have to work as hard to do the same tasks you normally do. Also, if you need to, replace your radiator with a newer one. B)
yusuebronko2_86
New member
maybe the relays? :huh:
I'm having the same problem. Here's my problem. Sorry for the length, but I want to give you all the facts.
My Bronco2 just started having a problem. It gets really rough and sputtery/jerky when hot and/or going uphill. The engine seems to be not getting enough fuel. Another issue happens when starting - it is hard to start and needs some babying. Putting it into Drive and pressing on the peddle before it dies seems to help. It will sputter a bit and then go.
It started happening the other day in Nevada, and got progressively worse. While travelling into the backcounty in southern Nevada, at the hottest point - about 105 degrees out - the bronco died completely. I was 40 miles from any paved road and probably 150 miles from a mechanic. Thought I was going to really have a bad day. But I let it sit, assessed my situation, looked at a few things, checked out how much water I had, etc. Then I tried again, and it started and went. I did not stop!
It went pretty well till I had to get up a few hills, then is went down to 25 mph jerkily. But I got back to my motel, 230 miles away. After letting it sit for quite awhile (now cool and rainy) it started right up (with slight hesitation still, but nothing compared to earlier). I left the next day early in the AM, and things went really well all accross the desert. Was able to keep up about 65 mph, eccept for a few hills. Then about 20 miles from home I had to go over a pass, and it was again about 100 degrees, and it balked. It did not stall, but I could not make it over the pass. I let it cool off for awhile though, it started roughly, but got up to a reasonable speed and I was able to make it over the pass (25 mph in places).
Any suggestions?
I let the tank go empty a few days before this happened (but I went about 300 miles after this). There was also a wood rat in the engine compartment! It may have chewed something or stuffed bedding material somewhere. No evidence of this though. I think it's gone. I could not catch it, I just ran it and left it in the hot sun thinking it would leave. Haven't seem it again. <_<
My Bronco2 just started having a problem. It gets really rough and sputtery/jerky when hot and/or going uphill. The engine seems to be not getting enough fuel. Another issue happens when starting - it is hard to start and needs some babying. Putting it into Drive and pressing on the peddle before it dies seems to help. It will sputter a bit and then go.
It started happening the other day in Nevada, and got progressively worse. While travelling into the backcounty in southern Nevada, at the hottest point - about 105 degrees out - the bronco died completely. I was 40 miles from any paved road and probably 150 miles from a mechanic. Thought I was going to really have a bad day. But I let it sit, assessed my situation, looked at a few things, checked out how much water I had, etc. Then I tried again, and it started and went. I did not stop!
It went pretty well till I had to get up a few hills, then is went down to 25 mph jerkily. But I got back to my motel, 230 miles away. After letting it sit for quite awhile (now cool and rainy) it started right up (with slight hesitation still, but nothing compared to earlier). I left the next day early in the AM, and things went really well all accross the desert. Was able to keep up about 65 mph, eccept for a few hills. Then about 20 miles from home I had to go over a pass, and it was again about 100 degrees, and it balked. It did not stall, but I could not make it over the pass. I let it cool off for awhile though, it started roughly, but got up to a reasonable speed and I was able to make it over the pass (25 mph in places).
Any suggestions?
I let the tank go empty a few days before this happened (but I went about 300 miles after this). There was also a wood rat in the engine compartment! It may have chewed something or stuffed bedding material somewhere. No evidence of this though. I think it's gone. I could not catch it, I just ran it and left it in the hot sun thinking it would leave. Haven't seem it again. <_<
rebel offroad
New member
i had the same problem to much back pressure with the stock exhaust also rinse out your radiator with a high presure hose from the inside of the trucks engine bay to ramove bugs and other junk if your over 100,000 miles the buy RESTORE blah some stuff that fills in the scratches in your cylinders to improve preasure and increase horsepower yw
parkeringljus
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I hope you fixed the problem by now. If the basic tune-up procedure are completed and a good radiator flush is completed and yet there are still problems as you mentioned, ensure that the vacum to the by-pass valve to the air pump is working correctly. First check that the air pump is working correctly. Also check to make sure that the vacum to the divertor on the air pump line is working correctly. If the by-pass valve is not opening correctly, the air pump may cause power loss and if there is no vacum to the divertor valve, the motor may get too hot. Most definitely, with the lack of air from the air pump, the catalytic converter is not receiving enough air to function correctly, which can also cause power loss. This is strange, but it is sound advice.
I noticed my BII was also getting hot and the oil pressure was high. I went through the usual stuffs like tune-ups, radiator flush, water pump and thermostat issues, but it did not solved the problem. Then, I check the air pump and various vacum controls and the by-pass valve and the diverter valve. My BII does not overheat now and the oil presure is normal once again.
