Question about 1994 Oldsmobile Cutlass Ciera

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Intake manifold has large amount of carbon buildup. Oil is getting up into the intake. Gas is getting in the oil. Does this indicate that the intake valves are leaking compression? Or does this engine need a complete rebuild? The lowest compression is 173 psi the 3 highest were 185 psi and the other 2 were in between. The spark plugs are shot and will be changed as well as the wires. The car was getting close to 30 mpg then dropped to 22 mpg and was losing power. It is a 94 olds cutlas ciera 3100.

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Change the oil,and the spark plugs,and see what happens,the cold fire plugs(old ones)are most likely the only problem.

Posted on May 31, 2010


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Posted on Jan 02, 2017


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Location of oil pressure sensor for 2005 H2 Hummer

The oil pressure sensor is behind the intake manifold. Remove the plastic cover on top of the engine. The intake manifold is the large black plastic piece under the cover. Reach in behind the intake manifold to access the oil pressure sensor. The pictures supplied show the view from the back of the engine, as if you are viewing from the firewall side of the engine


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Uses a large amount of oil, but no smoke from the exhaust, or any where else, plugs oil up very quickly, could one of my carbs be over fueling, one failed recently

Hi Philp:
Great Toy you have. My project car is a '73 GT6 MKIII.
I'd suspect that your carb problem and the oil consumption are separate issues. If the plugs are oiled up it would be logical to conclude that oil is getting into the cylinders. One would expect smoke from the exhaust. Not seeing it doesn't decessarily mean it's not there. Are you getting a lot of oil or carbon from the tailpipe?
Oil can get into the cylinders a number of ways:
- Bad rings - usually does not foul all plugs equally. A compression test may indicate but not always reliable.
- Bad valve guides/seals - this lets oil enter the cylinder via the valve. Intake valve - burns oil, Exhaust valve - increased crankcase pressure, PCV directs oil into intake manifold or carb.
- PCV valve fouled - stuck open - oil sucked into intake manifold or carb. This is the only way I can see oil entering the engine through the carb.

These should give you some things to follow up on.
Hope it helps.

Sep 04, 2015 | 1973 Triumph Stag

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Pattern for tighten intake manifold bolts on a 04 Chrysler pacifica

1)Clean and inspect gasket sealing surfaces.
2)Position new gasket.
3)Install the throttle body on the upper intake (if required).
4)Install upper intake manifold and hand start all attaching bolts.
5)Tighten bolts gradually starting in the center working outward until a torque of 12 Nm (105 inch lbs.) is obtained.
6)Install the front and rear intake manifold support brackets.
7)Install the oil level indicator and oil fill tube to intake manifold bolts (Fig. 155).
8)Install the EGR tube.
9)Connect vacuum lines to the following (Fig. 156):
Positive Crankcase Ventilation (PCV) Valve
EVAP Purge Solenoid
Power Brake Booster
10)Install alternator support bracket (Fig. 156).
11)Connect electrical connectors to the following (Fig. 157):
Manifold Tuning Valve (MTV)
Exhaust Gas Recirculation (EGR)
Throttle Position Sensor (TPS)
Idle Air Control (IAC)
Manifold Absolute Pressure (MAP)
12)Install the throttle and speed control cable bracket and retaining bolts.
13)Install throttle and speed control cables to bracket and throttle arm.
14)Install air cleaner housing and inlet hose.
15)Install the engine cover.
16)Connect negative battery cable.

May 30, 2015 | 2004 Chrysler Pacifica

1 Answer

No power

Check your Egr valve for carbon buildup. Also check intake manifold for plenum gasket failure , to check , you must open the throttle plate ,on throttle body . Look down there and see a large amount oil , that's drawn in under vacuum . This gasket fails quite often.

Jul 09, 2014 | 1999 Dodge Ram

1 Answer

I washed my 1995 firebird with 3.4 v6 and got water/eng cleaner in to the air intake and now runs like **** it fowled my plugs i changed them and it still runs like **** when i give it gas it boggs an

Have you checked the oil? Is there water in it? If so, change it and the filter. What's fouling the spark plugs, oil, carbon, etc? Here's a chart so you can better find out:

You may just want to try cleaning the intake manifold as well. Here's a how-to:

I wish you luck with your baby. Spark plugs do seem to be an issue with that car sometimes, or at least that's been the case with ours. Same model, year, engine, etc. Try to be more careful next time you clean it. I wish you all the best.

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Buildup in crankcase

it water mixed with your oil,it could be condensation or some how coolant entered the oil system.

Dec 27, 2009 | 2001 Chevrolet Malibu

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Oil light blinking when at stop and or idle.

make sure that the oil pressure switch is definitely the right one for your engine. also that the oil is a good quality the engine gets hotter the oil gets thinner, weaker and sounds like it is not strong eneough to keep the light out. hope this helps.

Apr 19, 2009 | 1996 Chrysler Cirrus

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If it's on your intake manifold your distributor seal/o-ring is bad.

Apr 02, 2009 | 1994 Ford F350 Crew Cab

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Oil on top of lower intake manifold

Its a common problem, but it has to be adressed before your engine is done. That oil is comming out wear the distributor wonce was. The plentem, or what you call upper intake will have to come back off, in order to get the plug out to chg. the rubber O- ring on the plugWhen you get it out it will look like half a distributor with the gear on the end and the O- ring towards the top. Its located right under the throuttle on left side of engine where the trans and block meat. There might be enought room to get it out without pulling the intake i'am not sure. But thats where the oil is comming from manny an engine has tied up because of that leak.

Feb 08, 2009 | 1995 Buick LeSabre

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