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car struggles with oil cap on, problem starting fixed new problem now
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mike hammer
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Feb 6, 2009, 2:42 PM
Post #1 of 6
(1426 views)
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car struggles with oil cap on, problem starting fixed new problem now
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I have just replaced the distributor rotor on my 93 2.5 plymouth acclaim. I also cleaned the hall position sensor which had a tiny piece of metal stuck to it be cause apparently it is magnetic. I suspect that the piece of metal was from the old rotor which was shorter than the replacement. With the sensor free of crap and the new rotor installed i tried to start the car and it worked at last. After a minute or two of running it began to idle quite rough. I removed the air filter cover in case it was a lack of air and it seemed to maked no difference. I then removed the oil filling cap and the engine resumed normal funtion ( not running rough or moving too much on its mounts). After 2 or 3 minutes running smoothly with no oil cap I turned the engine off and waited a minute or two. when i tried to restart the engine with the oil cap on it was reluctant to start on the first or second try I then stopped trying from fear of flooding the engine as i have already flooded it and replaced the spark plugs before eventually making it work. Could this be a result of gas in the oil. Why does the engine run well with no oil cap when no air filter cover seems to make no difference. what can i do before i try to start it again and run the risk of flooding. My joy at finding the hall sensor and rotor problem was very short lived and I have no idea what the no oil cap\smooth running relation could be I would apreciate any advice as i feel the current problem is something simple that i just dont know about as i am even by backyard mechanic standards second rate. Thanks.
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Loren Champlain Sr
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/ Moderator
Feb 6, 2009, 4:50 PM
Post #2 of 6
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Re: car struggles with oil cap on, problem starting fixed new problem now
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You hit the nail right on the head! Fuel contaminated oil vapors will be picked up by the PCV system, enrichening an already fuel soaked engine. By removing the oil fill cap, you are, if you will, giving it a breath of fresh air. I've had a few cars towed in over the years, where the fuel pump leaked fuel into the crankcase and the engine wouldn't start unless the PCV was removed from the valve cover (all were Fords).
Loren
SW Washington
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mike hammer
User
Feb 10, 2009, 8:54 AM
Post #3 of 6
(1410 views)
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Re: car struggles with oil cap on, problem starting fixed new problem now
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I have changed the oil and charged the battery and the car starts and runs fine I let it sit for one day after changing the oil with the oil cap off(covered lightly with a clean rag to prevent crap from getting in while all the fumes got out). With the new distributor rotor and distributor wires plus new clean plugs it runs better than before. Thank you for the advice and I hope your site can help even more people the same way it helped me.
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Loren Champlain Sr
Veteran
/ Moderator
Feb 10, 2009, 2:44 PM
Post #4 of 6
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Re: car struggles with oil cap on, problem starting fixed new problem now
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Mike; Thanks so much for the reply. I'm still a bit concerned as to why it was fouled so badly to begin with. Keep a real close eye on the oil. If it happens again, something is causing it to overfuel. You may even want to have the computer scanned, just to be sure. Faulty MAP sensor or O2 sensor are common causes. Good luck. Hope that's the end of it.
Loren
SW Washington
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mike hammer
User
Feb 13, 2009, 10:04 AM
Post #5 of 6
(1390 views)
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Re: car struggles with oil cap on, problem starting fixed new problem now
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the oil was very contaminated because before discovering the problem with the distributor I had incorrectly thought that the gas lines were frozen or the injector was malfunctioning so after adding some fuel line antifreeze i tried many times to start the car with no success. As well as that I shot some quick start into the intake with the gas pressed all the way down which i suspect allowed gasoline from the functioning injector , which i believed to be broken, to enter. several attempts to start were made also after adding a little bit of conductive goo on the plug ends. All together i can imagine about 20 or 30 different attempts to start the car coupled with the fact that I was due for an oil\filter change added up. The oil was fouled to the point that i could smell gas strongly on the oil I drained. I will indeed keep an eye on the oil and plan to buy a code reader when I can find one on sale. Thanks again with the help of your website i have been able to coax probably 80000 kilometres out of a 700 dollar used car.
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Loren Champlain Sr
Veteran
/ Moderator
Feb 13, 2009, 2:30 PM
Post #6 of 6
(1381 views)
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Re: car struggles with oil cap on, problem starting fixed new problem now
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Mike; That's great news. Thanks so much for the reply. Maybe, you'll coax another 80,000K out of it? Have a great weekend.
Loren
SW Washington
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