Not thirdgen but please help
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Member
Joined: Nov 2000
Posts: 343
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From: Snellville, GA USA
Car: 90 Formula
Engine: 350
Transmission: 700R4
Not thirdgen but please help
My Calais' (quad 4) air/oil seperator went bad and caused a lot of oil to pour into my intake, throttle body, and air filter. It now runs like it is running off of 2 cylinders. I replaced the air/oil seperator, air filter, spark plugs, and oxygen sensor. It still barely runs. It is throwing no codes, though. I didn't want to take it anywhere, but if no one can help me then I guess I will because I don't want to spend any more money if I am just going to need a rebuild. Any ideas on what is going wrong???
Any help is greatly appreciated.
Any help is greatly appreciated.
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Joined: Jan 2000
Posts: 19,680
Likes: 316
Formu 350,
I feel your pain. I have a four-holer that did the same thing. How is the compression? If enough oil was admitted to the chambers at once you may have slammed a piston hydraulically. It would take a lot of oil, and I don't know if that much could get past the separator at once, but it's a possibility.
Another thing to check is the MAP sensor. The diaphragms really don't like a lot of oil, and you may have suffered some damage if the system was oil soaked long enough. It should probably set a DTC if it were that far out of range, however.
As long as the cylinders were clean when you installed the new plugs, it should run acceptably. If there was residual oil in the chambers and intake runners, you might have trashed the clean plugs almost immediately. Try removing them for inspection and cleaning if necessary.
You can also remove a spark plug wire one at a time from the running engine to help locate a weak a dead cylinder. Insulated spark plug wire pliers are almost a must for that method. There should really have been no other permanent damage caused by the oil in the intake or chambers, unless of course you slugged the oil in all at once as described earlier.
I feel your pain. I have a four-holer that did the same thing. How is the compression? If enough oil was admitted to the chambers at once you may have slammed a piston hydraulically. It would take a lot of oil, and I don't know if that much could get past the separator at once, but it's a possibility.
Another thing to check is the MAP sensor. The diaphragms really don't like a lot of oil, and you may have suffered some damage if the system was oil soaked long enough. It should probably set a DTC if it were that far out of range, however.
As long as the cylinders were clean when you installed the new plugs, it should run acceptably. If there was residual oil in the chambers and intake runners, you might have trashed the clean plugs almost immediately. Try removing them for inspection and cleaning if necessary.
You can also remove a spark plug wire one at a time from the running engine to help locate a weak a dead cylinder. Insulated spark plug wire pliers are almost a must for that method. There should really have been no other permanent damage caused by the oil in the intake or chambers, unless of course you slugged the oil in all at once as described earlier.
Thread Starter
Member
Joined: Nov 2000
Posts: 343
Likes: 0
From: Snellville, GA USA
Car: 90 Formula
Engine: 350
Transmission: 700R4
Well I tried a new MAP sensor, with no luck.I guess it is timing related. Anyone ever changed the timing gear on a DOHC engine? If so, how hard is it and are there any special tools needed? Thanks for any help.
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