Skip the auto shop - Our mechanics make house calls

Q: upper intake valley puddles with oil, no seal leakages, misfire at #3,5,6...

asked by on

Saturn Vue-honda engine and tran. misfire #3, 5, 6. Used car dealership gave a 30 day/1000mi warranty. I had it towed to there location after my mechanic diagnosed it. they wouldn't take the diagnostic results. There mech changed plugs (put in wrong ones (2 times) did a valve adj. which my emissions sticker says "no adj needed." they didn't tell there mechanic about the rear main seal leak. It had same miss when I got it back. Went to Saturn service provider for diagnostics again! There Diag. misfire #3, 5, 6 + low ECT & leak. I took it back to my mechanic-Corrected plugs-serviced tran-fixed leak-cleaned upper intake valley (pools of oil), ran smoother-still has misfire. Compression chk-excellent, no overheating, misfire @ idol only-not once warmed up/high speed. Engine light just went back on and the miss is worse. Upper intake valley puddles with oil. Still have 2 days warranty I fear the dealers mech will ruin my car. It may be safer to have you fix the problem.

A: A misfire can be caused by a variety of rea...

A misfire can be caused by a variety of reasons such as a vacuum leak, dirty fuel injectors, a weak fuel pump (low fuel pressure), a faulty fuel pressure regulator, fouled spark plugs, bad spark plug wires, or weak ignition coil. Any of these can cause a misfire and some may be impacted or compounded by another when multiple issues are wrong with the car. To have the the problem scoped out firsthand, have a certified professional from YourMechanic fully diagnose the misfire and pinpoint exactly what repairs are needed.

Was this answer helpful?

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Volvo V50 Won't start new ABS

Hey there, thanks for writing in about your 2007 Volvo V50. You may have to take the vehicle to the dealer to have the systems flashed. The ABS control units are mated to the vehicle, and will not work when...

Q: My car won't start

Hi there, from the symptoms you have described, it sounds more like a fuel issue. Either the fuel pump is failing and not pumping enough fuel into the engine, or some component such as a coolant temp sensor or fuel...

Q: car not starting battery

Hi there. It sounds like you need a new ignition switch. This is the most common failure on your vehicle that will cause this. It can also be a failure in the body control module, but that is not nearly...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...