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Old 10-21-2011, 09:46   #1 (permalink)
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5.0 Coolant Leak/White Smoke Advice

Hello all. I'm new to the forum but have enjoyed reading many of the tech tips so far. Now I find myself needing some advice. I recently replaced the valve cover gaskets on my '91 5.0. During that job I also removed the throttle body (not due to coolant leak just for cleaning purposes) and then replaced the throttle body to EGR gasket. After restarting the motor I had a steady coolant leak coming from the throttle body/EGR gasket on to the valve cover along with a ton of white exhaust smoke from all the coolant no doubt being sucked through the intake. After removing the throttle body and gasket I realized the leak was from my failure to get every last bit of the old gasket off. I re-scraped getting a fully clean surface and re-installed the throttle body. At this time, I also temporarily by-passed my EGR coolant line. I obviously had a lot of coolant contamination in my oil as it looked very milky and my 5.0 now looks like a fog machine. I was hoping a fresh oil change would help clear up my heavy white smoke problem but, not the case. I know there should not be any new leaks from my EGR plate since I currently have the coolant hose bypassed. How can I get my 5.0 running clean again? The engine sounds normal but how can I purge it of the coolant contamination? Thanks for any advice you've got for this amateur shade tree-er. Mark
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Old 10-21-2011, 09:50   #2 (permalink)
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Re: 5.0 Coolant Leak/White Smoke Advice

Sure it's not a head gasket gone ? Is the cooling system over pressurising ?
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Old 10-21-2011, 10:07   #3 (permalink)
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Re: 5.0 Coolant Leak/White Smoke Advice

Well, at this point, I really can't say with certainty that it isn't either of those two suggestions. However, I know that before my V/C gasket repair I didn't have any coolant leaks so it would seem like a big coincidence for a head gasket to go right at start up after the V/C gasket job. I have to believe the smoke is due to the original EGR gasket leak. As for over pressurized cooling system, would bypassing my EGR spacer cause that condition to occur? I was hoping that most of the coolant contamination came out during the oil change. I'm assuming that there is not a second condition contributing to the white smoke now. I just have no idea how long that one leak should continue to cause smoke if there's no longer a current leak. The car probably ran for a few minute as I first detected the original leak.
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Old 10-21-2011, 10:22   #4 (permalink)
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Re: 5.0 Coolant Leak/White Smoke Advice

As you suggest it could just be coolant still in exhaust system , sometimes it takes a good blast down the motorway / highway to dry it up and clear system . Thats if no leaks and cooling system o.k .

P.s
Take it you changed the oil filter also ?
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Old 10-21-2011, 16:46   #5 (permalink)
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Re: 5.0 Coolant Leak/White Smoke Advice

Yes, I did change the filter also. Looks like your advice on the test run did the trick. After a drive to the gas station for a fill up, there was still some white smoke but not nearly as much. I then took it for a strong 15-20 minute drive and after that the smoke was gone and my idle fumes are clear again. I reconnected my EGR coolant lines, checked one more time for leaks and I'm back in business. Thanks!!
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Old 10-22-2011, 02:14   #6 (permalink)
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Re: 5.0 Coolant Leak/White Smoke Advice

Glad to help , thanks for update .
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