Q: Misfires and low oil pressure when stopping. 2002 GMC Savana 2500

asked by on

My van is having trouble with misfiring and it also has low oil pressure at stops. The engine idles badly and when I come to a red light and have to stop, the oil pressure drops. Another problem is that the exhaust smells rich. I have replaced the distributor, cap, wires, and it also has new plugs. Please give me your diagnosis and what I need to do to get my van in a good running condition. Thanks.

A: Hey there, thanks for writing in about your...

Hey there, thanks for writing in about your 2002 GMC Savana. If you are getting misfiring, then you should have a Check Engine Light on. The light should be scanned to get the codes to see what cylinders are misfiring. Remove the affected cylinders to inspect the plugs to see if they are fouled from oil or fuel. The oil pressure drop may be due to a fuel system over rich condition like a fuel pressure regulator leak in the intake which could be causing the rich engine, running rough issue, and oil getting diluted with fuel causing low oil pressure. To have this verified, consider having a qualified pro, such as one from YourMechanic, inspect the misfiring and oil pressure problem.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: overheating no cooling fans

The relays are turned on by the Powertrain Control Module (PCM) by grounding the control wire of the relays. The PCM needs input from the engine coolant sensor above the water pump to sense whether the engine is overheating before...

Q: USB adapter caused shock & gas smell in back seat

Hello. It sounds like you have a number of issues going on. The coolant leaking like this sounds like a failing head gasket. A block test would need to be done to see if it is failing. The shock is...

Q: How can I find out what exactly is happening in my misfire?

Hello there. Misfires are a common problem with your 1997 Subaru Impreza as the vehicles ages. The most common failures are the spark plugs, coil, plug wires, fuel injectors, fuel pump, vacuum leaks, or an oxygen sensor. You have done...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...