I have always kept up with the regular maintenance on my vehicles. I found that the rpm's were dropping slightly( 800 dropping to 600) when idling. When the engine light came on, I checked and then changed the plugs and wires. The van ran better after this quick and simple fix and the engine light went out. One month later, the engine is back to doing the same thing again. While checking the fluids, I checked to see if the air filter needed to be replaced, and found oil on the air filter. I have never seen this before, and would like to know what may be the cause(and hopefully a cheap fix).
Thanks for the info,
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sounds like an intake manifold gasket leak which will throw of the air fuel mixture and engine cannot account for extra air.also check(maf)(map)(tps)sensors and/or (iac)intake air control valve...hope this helps you. thanks for using fix ya please rate answer.
if you have no lisghts on and the gaint is running well.. all you need is usual replacements:
- Engine Oil
- If Transmission filter was not changed in 90K, you should do it
- Oil & air filters
- driving (timing) belt
- if you feel so delay in start or power loss: replace spark plugs
- Check fluid levels in:
+ brake oil
+ Power Steering Oil
Depending if you kept up with recommended maintenance as per factory. If you did this is what the factory sheet suggests for 90000 Miles checkup :
Diagnose / Test
Vehicle : verify parking brake operation
Power steering fluid
Windshield Washer Reservoir
Air filter element
Cabin air filter
Engine oil and sump washer
Engine oil filter
More maintenance history needed. Oil changed regularly, timing belt replaced at 60 K miles, Engine air filter & intake air hose inspection?
Causes of the problem you describe are many. Recommend you have a technician check your throttle position sensor for any bad spots in the potentiometer... most likely cause when there is NO Check Engine light.
The "Tachometer" is the gauge that indicates the engine RPM. It is not unusual for the idling RPM to drop slightly when the air conditioner comes on. The air conditioner represents a fairly large load on the engine so when it starts, the RPM will drop slightly. When driving, you'll probably not even notice that the air conditioning is a load on the engine unless you're accelerating uphill, pulling a trailer or passing another vehicle while the vehicle is fully loaded. At idle, the Envoy's computer should detect the falling RPM and make adjustments in fuel delivery to bring the RPM back up.
In any case, it shouldn't be cause for alarm, unless the air conditioner is stalling the engine. If this is the case, you are probably in need of service. The issue of low cooling from the air conditioner while idling in gear (as is the case when stopped in traffic, etc.) is correctable free of charge at the dealership on certain vehicles as a result of a recall. Your dealer can tell you if your vehicle is affected or if there is other recall work pending on your vehicle based on the VIN.