5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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Ive finally got a new battery into the stang this weekend, and ran it for the first time this year. It started up fine and ran alrighht. After shutting it down, and starting it back up when the engine is already warmed up, i get a big puff of white smoke. Any ideas on what could be going wrong? I also get excessive crank pressure that keeps blowing my dipstick out of the tube. I understand this could be PCV related, but ive replaced the PCV and checked the screen and everything is clear.
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you could be losing compression from a broken ring and you could also be losing coolant through a leaky head gasket you don't have any overheating problems do you?
91 mustang 5.0 lx,306 shortblock,E-303 cam,ported and polished E7's,rebuilt stock T-5,bbk E/L shorty headers,with their 2 1/2" o/r H-pipes,70 mm maf,3G alt.,upr adj. upper c/a's 3:73 gears. race weight with driver:3260,only a 100 lbs. more than the 85
85 mustang: rest in piece
Best time 13.7@ 102 mph 2.074 60' on street tires(in the '85)
Best time 14.3@ 96 mph 2.13 60' on street tires(in the '91)
Are you getting any coolant in the oil? I used a product called Thermagasket on a 5.0 once with great results. It costs about $100 and may be worth a try if it turns out to be a head gasket. The other option would be to replace the gasket. I'd also eliminate a ring issue with a compression or leak down test as well since you are getting high crankcase pressure.
My 5.0 in my Falcon uses a Lincoln Towncar A/C condenser and a '89 Mustang radiator and here in Houston in 100 degree temps with the a/c going full blast does not get hot at idle in traffic at all. I'm running a Flex-A-Lite black magic fan, but a stock Mustang fan should provide similar air flow, so you should not be getting hot at all I wouldn't think.
Does your coolant look good? If exhaust is getting in there it usually will turn kinda brownish and will gunk up in the bottom of the radiator over time. Try draining some to check. The engine I had the trouble with had gunked up the bottom so bad it would not drain and it still didn't overheat!
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