Question about 1999 Pontiac Grand Prix

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Motor dies with oil cap on but runs good when off

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Check that the pcv is not plugged and or stuck open. also check the level of the oil and the colour. if it's milky white you have blown the motor

Posted on Jul 13, 2010

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Posted on Jan 02, 2017

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2 Answers

1990 K5(350.Why did engine die at about 110-115 mph?


Remove engine oil cap. Replace your blazer with a new one. Reinstall old oil cap to new vehicle. I guarantee your problem will be fixed.

Nov 30, 2015 | Chevrolet Blazer Cars & Trucks

1 Answer

Car says no oil pressure ,with car running l,lots of vacuum when remove oil fill cap ,car dies when it's removed


I suspect two problems. Vacuum when removing oil cap is likely PCV valve. No oil pressure could either be true, and caused by oil pump or clog, or not true, caused by bad sensor.

Nov 17, 2015 | Cars & Trucks

1 Answer

Ford 5.4L 3 valve motor has vacuum in the oil pan and will not run with the fill cap off.


The only vacuum being pulled, is the hose from the valve
cover (PVC) hose ,I believe, to the throttle body area

The reason you have a crankcase vacuum so high on the other
valve cover & oil fill cap, is that air can't get in to replace the air
drawn in behind the throttle body

eg: you have no air coming in,find out why

I think the air in comes from the ducting around the MAF Sensor
area in a 1" plastic or rubber tubing to the cover where your fill cap is

My Lincoln is like that

I have been around 5.4 fords I just haven't googled a picture of yours,you can do that or look over your truck

The vacuum amount or flow rate is controlled by the PCV valve
hoses & system design,so you have no air coming in the other
cover or little,thus high crank case vacuum

That said-- what your doing is NOT a test & in some motors will set
a MIL Lamp & OBD Codes

Once the oil cap if off, you have an open hole for air to rush in & back to the pcv & intake,so leave it on when the motor is running

Opposite your theory

It dies because with the oil cap off, your letting in unmetered air
that goes into the intake,cylinders & out the exhaust & you loose
fuel trim control,as the oxygen sensors & pcm are confused

Today's vehicles work in Milli Seconds & only work within programmed parameters

Apr 10, 2014 | 2004 Ford F150

1 Answer

When my Altima has been running a while (on frwy) At about 60 -65 MPH The car feels like it jumps. Or wants to switch gears. Then when i come to a stop, such as a red light The car sounds and feels as if...


Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Aug 17, 2011 | 2003 Nissan Altima

2 Answers

I have a 96 eclipse.that was overfilled w/oil new sparkplugs and wires,air filter,and oil changed.now it runs fine for about a mile then it acts like it is running out of gas and dies.wait bout 5min...


check your distributor cap to make sure no oil got in there also check your fuel pressure regulator to see if its a normal pressure any shop can tell you what it should be so just call and ask the fuel pressure tester is about 45 dollars at autozone

Jan 25, 2010 | 1996 Mitsubishi Eclipse

2 Answers

Oil light turns on at idol, and almost dies at idol has oil


Replace your fuel filter and airfilter. If this doesn't work - you may need a new coil pack or cap and rotor if it has a distributor; if this is the case, change the spark plugs and plug wires.

May 10, 2009 | 1997 Pontiac Sunfire

2 Answers

1992 galant 2.0L, car runs for approx. 30-45mins. then stalls out, and runs on one or two cylinders. We recently changed distributor cap and rotor, and ignition coil. no luck yet! battery is nice and clean...


sounds to me that the rings on the piston are worn out with the engine warmed up the cylinder expands a little causing blow by take the oil cap off and see if there is excessive blow by

Dec 02, 2008 | Mitsubishi Galant Cars & Trucks

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