I have a '94 SHO ATX that sat for 6+ years. I've done basic maintenance of new gas, oil change etc... to give it fresh fluids. I got it to start and run decently and then after a few months it got hard to start and I smelled gas from under the hood like a carburated car that is flooded. If I can get it to start, it runs crummy, some black smoke out of the exhaust, and will hardly pull itself. Acts like it is getting too much gas. I discovered that the crankcase was way overfull and filling with gas/oil mix. I'm changing the oil again to get fresh oil in. Where do I start looking for the starting problem and why there is gas in the crankcase?
'94 SHO - Gas in Crankcase
- Thread starter wirenut
- Start date
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Sounds like you have a missfire on one or more cylinders and it's washing down the cylinder wall. Try pulling codes to see what comes up and then pull the spark plugs and check to see which are fouled. I'd go ahead and change all 6 plugs just because. I'm partial to Autolite 3924s in a stock engine. Being that you are chasing an unknown problem at this point they should be your cheapest option too.
-Chad
-Chad
luigisho
SHO Member
Fuel only meets oil in the cylinder past the piston rings. So bad ring(s), maybe stuck injector, or no spark in one cylinder. Hopefully someone with direct experience with this issue will chime in.
Thank you for the suggestions. Sounds like I am looking at injectors and the fuel system. At this point, I don't have a way to read engine codes, so I'm going to try new spark plugs, a fuel filter, and some injector cleaner to see if I can make it happy again.
NoSlo
SHO Owner
0. revert any mods or problems to pcv hose routing
1. check plugs and fouling to see which cylinder has gas wash
1a. (find damaged plug or wire)
2. check compression while they are out with screw-in tester
2a. (rebuild engine to fix cracked cylinder ring that lets oil in exhaust and gas in oil)
Greg Corcoran
SHO Member
Wow! sounds like it almost has to be 1 or more stuck injectors. It's hard to imagine how else so much gas could end up in the crankcase. Besides the check for which cylinder(s) are fouling, did you do anything to flush the fuel lines from the tank to the engine when you put in fresh gas? If the lines aren't flushed you may go through multiple iterations of stuck/plugged injectors.
I did not flush the lines from the tank before running the engine. Makes sense and it sounds like I should have done that first. Thank you for that suggestion.
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