Q: engine misfire on running temperature

asked by on

my volvo s40 1.6 start misfire after the service (changed timing belt) after that its start misfire after two miles of run or when the temperature get half in the meter. I check with local volvo dealer they could't figure it out. I replace EGR MAF AND COOLANT SENSORS It does't cure the problem, I noticed that fan is running more time than the usual even after engine is turned off.

My car has 128000 miles.
My car has a manual transmission.

This sounds like you may have potentially two unrelated problems. The first may be related to the issue of timing causing the misfiring, and the second could be related to the fan running more than usual.

First, the misfiring issue sounds like potentially a problem related to the service related to the timing belt being replaced. It is very easy to misalign a timing belt even by one tooth, which can cause misfiring problems.

The second issue is related to the fans coming on more often than necessary related to a variety of issues, some of which you have already fixed. The one thing you did not mention was the thermostat.

If the thermostat is not functioning correctly, this can cause the fan to run more often than normal. I would recommend having an expert mechanic from YourMechanic come to your home or office to diagnose and repair the misfiring issue for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. engine misfire on running temperature

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Volvo not starting

Hi. Your Volvo has a coded key, which insures security, to start your car. It is possible that the key is bad or worn. Try a spare key to see if it works. If not, the issue may be with...

Q: Only when it's really hot outside the temperature gauge reaches almost about less then half way. Car won't start up again till coo

There may be 2 issues to deal with here. The inability of the engine to reach "normal operating temperature" (always the center of the gauge), indicates either a weak or failed thermostat, or a failed coolant temperature sending unit/coolant temp...

Q: Q: Something is draining the battery.

I would look inside the car for an interior light that is coming on first. Usually a glove box light or a trunk light that is staying on when the car is off. If it's not a light then a...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.