Broncobowsher
Total hack
- Joined
- Jun 4, 2002
- Messages
- 35,634
Did you check anything that I listed?
Did you check anything that I listed?
Yes.
Fan is cutting air away from radiator
Proper rotation fan and pump
Visual flow across the radiator while running / open tstat
I'm currently verifying.... The new radiator only has 8 fins per inch. Radiator specialist said that's the problem (cooling capacity issue) Even though it's a 3 core, not enough heat is being transferred thru. Verifying with a radiator swap.
Yes. The new radiator only has 8 fins per inch. Radiator specialist said that's the problem (cooling capacity issue) Even though it's a 3 core, not enough heat is being transferred thru. Verifying with a radiator swap.
6-26 Update: I looked over the engine bay again, checked plugs (white) tested vac lines etc, and may have discovered another issue. While the FP regulator held vacuum on low, the connection at the regulator was allowing air in under high vacuum (testing with my mouth of course) Culprit?
Doubt it. If anything a loss of vacuum will increase fuel pressure, which is not a source of overheating.
The lean AF mixture condition will contribute to higher head and valve temps, which will ultimately cause higher engine temps, but I don't think this is the main cause. Getting the AF ratio right will help. I think you still need to explore the cheap radiator issue.......but it will cause a lean condition with the vacuum leak. I will know for sure on the next hot day
The miniscule amount of air that could be leaking through the fuel pressure regulator hose won't be distinguishable to the EFI system. Especially at the airflow levels under load where you are having your hot running issues.
Good running EFI engines usually have plugs that come out pretty white. That is a reason they can last 100k miles between changes. I have pulled plenty of plugs that are very white and very old with the electrodes burned away I don't really worry about white plugs that much. You will have detonation issues due to lean before anything else.
Glad it's working.
My high fin count radiator wouldn't let air pass...Exploder fan / shroud. swapped in a large 460 radiator with same shroud and it's would easily hold a business cards against the grill at idle... too many fins per inch on mine
I have been fighting similar issues. I was using a dorale electric fan and could run fine at low rpms but at higher rpms my temps would shoot up quickly. i went through my complete cooling system, water pump, thermostat, radiator, hoses, rad cap etc..
I decided it must be an air flow issue and purchased a mark viii fan this week only to find out it would not fit. So I cut out the electric fan and used it as a shroud with the a explorer clutch fan. bronco now idles at 170 and runs at 190 with a/c on in 100 degree temp. I only have limited miles but I am not seeing the same issue I was seeing with the old set up.
I realize our set ups are different but thought it might bee good food for thought.